EP0174019B1 - Steel strip plated with a zinc-based coating layer containing an inorganic dispersoid - Google Patents
Steel strip plated with a zinc-based coating layer containing an inorganic dispersoid Download PDFInfo
- Publication number
- EP0174019B1 EP0174019B1 EP85111166A EP85111166A EP0174019B1 EP 0174019 B1 EP0174019 B1 EP 0174019B1 EP 85111166 A EP85111166 A EP 85111166A EP 85111166 A EP85111166 A EP 85111166A EP 0174019 B1 EP0174019 B1 EP 0174019B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- zinc
- coating layer
- steel strip
- plated steel
- surface coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- 229910000831 Steel Inorganic materials 0.000 title claims description 101
- 239000010959 steel Substances 0.000 title claims description 101
- 239000011247 coating layer Substances 0.000 title claims description 42
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims description 38
- 239000011701 zinc Substances 0.000 title claims description 38
- 229910052725 zinc Inorganic materials 0.000 title claims description 38
- 239000002345 surface coating layer Substances 0.000 claims description 72
- 239000002245 particle Substances 0.000 claims description 37
- 239000000758 substrate Substances 0.000 claims description 34
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 25
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 25
- 239000011159 matrix material Substances 0.000 claims description 25
- 239000010410 layer Substances 0.000 claims description 18
- 229910052759 nickel Inorganic materials 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 239000010941 cobalt Substances 0.000 claims description 11
- 229910017052 cobalt Inorganic materials 0.000 claims description 11
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 11
- 239000011651 chromium Substances 0.000 claims description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 239000011572 manganese Substances 0.000 claims description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 150000001247 metal acetylides Chemical class 0.000 claims description 6
- 150000004767 nitrides Chemical class 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- 229910052684 Cerium Inorganic materials 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 229910052746 lanthanum Inorganic materials 0.000 claims description 4
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052714 tellurium Inorganic materials 0.000 claims description 2
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 claims description 2
- 150000004763 sulfides Chemical class 0.000 claims 4
- IXQWNVPHFNLUGD-UHFFFAOYSA-N iron titanium Chemical compound [Ti].[Fe] IXQWNVPHFNLUGD-UHFFFAOYSA-N 0.000 claims 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims 1
- 229910052814 silicon oxide Inorganic materials 0.000 claims 1
- 238000005260 corrosion Methods 0.000 description 26
- 230000007797 corrosion Effects 0.000 description 26
- 230000002708 enhancing effect Effects 0.000 description 11
- 238000009713 electroplating Methods 0.000 description 10
- 238000007747 plating Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000003973 paint Substances 0.000 description 8
- 238000000227 grinding Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- 239000006087 Silane Coupling Agent Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- 238000007738 vacuum evaporation Methods 0.000 description 2
- KVCQTKNUUQOELD-UHFFFAOYSA-N 4-amino-n-[1-(3-chloro-2-fluoroanilino)-6-methylisoquinolin-5-yl]thieno[3,2-d]pyrimidine-7-carboxamide Chemical compound N=1C=CC2=C(NC(=O)C=3C4=NC=NC(N)=C4SC=3)C(C)=CC=C2C=1NC1=CC=CC(Cl)=C1F KVCQTKNUUQOELD-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910018605 Ni—Zn Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- DMZWVCJEOLBQCZ-UHFFFAOYSA-N chloro(ethenyl)silane Chemical compound Cl[SiH2]C=C DMZWVCJEOLBQCZ-UHFFFAOYSA-N 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- QFSKIUZTIHBWFR-UHFFFAOYSA-N chromium;hydrate Chemical compound O.[Cr] QFSKIUZTIHBWFR-UHFFFAOYSA-N 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- -1 lanthanium Chemical compound 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- QELJHCBNGDEXLD-UHFFFAOYSA-N nickel zinc Chemical compound [Ni].[Zn] QELJHCBNGDEXLD-UHFFFAOYSA-N 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/265—After-treatment by applying solid particles to the molten coating
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
- C25D15/02—Combined electrolytic and electrophoretic processes with charged materials
Definitions
- the present invention relates to a zinc-plated steel strip with a zinc-based coating layer containing an inorganic dispersoid. More particularly, the present invention relates to a zinc-plated steel strip having at least one zinc-based coating layer containing fine inorganic dispersoid particles and formed on at least one surface of the steel strip, which zinc-plated steel strip exhibits excellent resistance to corrosion, enhanced workability, and superior weldability and is useful for producing cars, building and construction materials, and home electric appliances.
- surface-treated steel strips are required to exhibit a high resistance to corrosion not only before but also after being painted. That is, surface coated steel strips have to exhibit a satisfactory paint adhesion and satisfactory resistances to perforation corrosion and to red rust when the paint film layer is scratched.
- surface-treated steel strips must exhibit excellent workability and weldability.
- Japanese Examined Patent Publication No. 56-49999 discloses a plated steel strip having an electroplating layer comprising a matrix consisting of zinc alone and 2.0 to 15% of Si0 2 particles, and optionally, an electroplating surface layer consisting of 1 g/m 2 or more of zinc alone.
- Japanese Examined Patent Publication No. 57-17960 discloses a plated steel strip having a base plating layer consisting of zinc alone and a surface plating layer comprising a matrix consisting of Mn alone and particles consisting of at lesat one member selected from metallic Ni, Cu, AI and Cr and oxides of Ti, AI and Mg, and having a thickness of 0.1 ⁇ m or more.
- Japanese Examined Patent Publication No. 46-37882 discloses a plated light metal article having a base plating layer consisting of zinc alone and a surface electroplating layer comprising a matrix consisting of nickel alone and a dispersoid consisting of solid particles having a size of 1 1l[11 or less and located in the surface portion of the surface electroplating layer.
- Japanese Unexamined Patent Publication No. 56-123,395 discloses a plated steel strip having an electroplating layer comprising a matrix consisting of zinc alone or a Ni-Zn alloy and chromium hydrate particles having a size of 0.3 pm or more and dispersed in the surface portion of the layer with a depth of 0.3 pm from the surface of the layer.
- Japanese Unexamined Patent Publication No. 52-109,439 discloses a plated metal article having a base electroplating layer consisting of nickel alone and a surface electroplating layer comprising a nickel matrix and silicon carbide particles.
- a base electroplating layer consisting of nickel alone
- a surface electroplating layer comprising a nickel matrix and silicon carbide particles.
- the resultant plated steel strips are not always satisfactory in view of the strict requirements mentioned above.
- JP-A-79 159 342 discloses a process for producing a corrosion resistant plated composite steel strip in which a surface of a steel strip substrate is coated with an electroplating layer comprising a matrix consisting of zinc and fine particles consisting of Si0 2 sol, Ti0 2 sol and Zr0 2 sol, and dispersed in the zinc matrix.
- JP-A-79 146 228 discloses a plated steel strip in which a cold-rolled steel strip substrate is coated with an electroplating base layer consisting of a matrix consisting of zinc alone and Si0 2 fine particles, and the base layer is coated with an electroplating surface layer consisting of zinc alone.
- Metal Finishing Abstracts vol. 22, No. 6, November/December 1980, page 292 discloses a plated steel strip comprising a steel strip substrate, an under-coating layer composed of a matrix consisting of zinc alone and AI 2 0 3 particles dispersed in the matrix, and an upper coating layer consisting of chromium alone.
- An object of the present invention is to provide a zinc-plated steel strip which exhibits excellent resistance to corrosion even after the plated steel strip is painted and the paint film layer is scratched.
- Another object of the present invention is to provide a zinc-plated steel strip which exhibits excellent workability and weldability.
- the zinc-plated steel strip with a zinc-based coating layer of the present invention which comprises a substrate consisting of a steel strip and at least one surface coating layer plated on at least one portion of at least one surface of the steel strip substrate, the surface coating layer consisting essentially of a matrix consisting of at least one zinc alloy and fine dispersoid particles dispersed in the matrix and consisting of at least one member selected from the group consisting of oxides, carbides, nitrides, borides, phosphides, and sulfides of aluminum, iron, titanium, molybdenum, copper, zinc, nickel, cobalt, lanthanum, cerium and silicon.
- the zinc-plated steel strip of the present invention may further comprise an intermediate coating layer formed between the steel strip substrate and the surface coating layer and consisting of at least one member selected from the group consisting of zinc and zinc alloys.
- a zinc alloy-surface coating layer plated on a surface of a steel strip and containing specific inorganic dispersoid particles is highly effective for enhancing resistance of the steel strip to corrosion, especially perforation corrosion after the plated steel strip is painted and processed.
- the reasons for the special effect of the above-mentioned specific zinc alloy coating layer are not completely clear. It is assumed, however, that the specific inorganic dispersoid particles in the surface coating layer form a sort of a barrier against the corrosion so as to restrict undesirable corrosional oxidation-reduction reaction in the coating layer. Also, it was found by the inventors of the present invention that the surface coating layer containing the specific fine inorganic dispersoid particles is effective for enhancing the weldability, especially spot weldability, of the plated steel strip.
- an intermediate coating layer consisting of zinc or zinc alloy and formed between the steel strip substrate and the surface coating layer containing the specific inorganic dispersoid particles is highly effective for enhancing the specific effects of the surface coating layer, especially, for enhancing the resistance to perforation corrosion of the processed portion and the workability, of the plated steel strip.
- the term "workability of the plated steel strip” refers to a resistance of the plated steel strip to powdering of the coating layer, that is, peeling of the coating layer from the substrate when processed.
- the reasons for the above-mentioned effects of the intermediate coating layer are not clear. It is supposed, however, that the surface coating layer and the intermediate coating layer have a synergistic effect on, the plated steel strip. Also, it is supposed that the intermediate coating layer exhibits a special type of lubricating effect between the substrate and the surface coating layer.
- a substrate consisting of a steel strip has at least one plated surface coating layer consisting essentially of a matrix consisting of a plated zinc alloy and fine dispersoid particles dispersed in the matrix and consisting of at least one member selected from oxides, carbides, nitrides, borides, phosphides and sulfides of aluminum (AI), iron (Fe), titanium (Ti), molybdenum (Mo), copper (Cu), zinc (Zn), nickel (Ni), cobalt (Co), lanthanum (La), cerium (Ce), and silicon (Si).
- AI aluminum
- Fe iron
- Ti titanium
- Mo molybdenum
- Cu copper
- Zn zinc
- Ni nickel
- Co cobalt
- La lanthanum
- Ce cerium
- Si silicon
- the steel strip usable as a substrate for the present invention is not limited to specific types of steel strips. However, usually, the steel strip is preferably selected from ordinary steel strips, AI-killed steel strips and high tensile steel strips.
- the resultant surface coating layer exhibits an excellent effect in enhancing the resistance to corrosion and workability and weldability of the plated steel strip.
- These effects of the surface coating layer of the present invention are excellent compared with those of other zinc or zinc alloy coating layers which are free from the specific inorganic dispersoid or contain other dispersoids.
- the surface coating layer be in an amount of from 1 to 400 g/m 2 , and has a thickness of from 0.1 to 40 pm.
- the matrix consists of a zinc alloy.
- the zinc alloy is preferably selected from alloys of from 20% to 99.7% by weight of zinc with 0.3% to 80% by weight of at least one additional metal member selected from the group consisting of nickel, copper, cobalt, chromium, tellurium, lanthanium, cerium, iron, and manganese.
- the above-mentioned specific additional metal in a content of from 0.3% to 80% by weight is effective for enhancing the paint adhesion of the surface coating layer to the steel strip substrate surface when the surface coating layer is scratched and for improving the resistance of the surface coating layer to corrosion, especially, to perforation corrosion within a strict corrosional environment.
- the amount of inorganic dispersoid is preferably 0.01% or more, more preferably from 0.01 % to 95%, still more preferably from 0.01 % to 30%, based on the entire weight of the surface coating layer.
- the resultant plated steel strip exhibits unsatisfactory weldability.
- the content of the inorganic dispersoid does not exceed 95% based on the entire weight of the surface coating layer. Also, when the plated steel strip is required to have excellent resistance to powdering after the plated steel strip is strictly processed, it is preferable to limit the content of the inorganic dispersoid to 30% or less based on the entire weight of the surface coating layer.
- the fine inorganic dispersoid particles in the surface coating layer preferably have an average size of 5 microns or less, preferably, from 0.01 to 1 Ilm. Fine inorganic dispersoid particles having an average size of 51lm or less are highly effective for enhancing the resistance of the resultant plated steel strip to powdering when the strip is subjected to severe processing.
- the term "average size" refers to a size of the particles in a largest distribution percentage.
- the surface coating layer of the present invention may cover the entire surface of the steel strip substrate. Otherwise, the surface of the steel strip substrate may be partially covered by the surface coating layer, for example, in the form of a plurality of stripes.
- an intermediate coating layer consisting of zinc or a zinc alloy may be formed between the steel strip substrate and the surface coating layer.
- the intermediate coating layer may be formed so as to partially cover or entirely cover the surface of the steel strip substrate.
- the intermediate coating layer consists of zinc or a zinc alloy.
- the zinc alloy is selected from alloys of 20% to 99% by weight of zinc and 1 % to 80% by weight of at least one metal other than zinc, preferably selected from the group consisting of nickel, cobalt, chromium, iron, and molybdenum.
- the intermediate coating layer is preferably in an amount of from 0.5 to 400 g/m 2 , more preferably, from 1 to 200 g/m 2 , and preferably has a thickness of from 0.1 to 20 pm.
- the surface coating layer in the zinc-plated steel strip of the present invention may have a covering layer formed thereon by means of a silane-coupling treatment or a chemical conversion treatment.
- silane-coupling treatment refers to a treatment of the surface of the surface coating layer with a silane-coupling agent, for example, vinylchlorosilane or vinyltrimethoxysilane.
- chemical conversion treatment refers to a phosphate treatment or a chromate treatment applied to the surface coating layer of the plated steel strip.
- the silane-coupling treatment and chemical conversion treatment are effective for enhancing the primary adhering property of the surface of the plated steel strip to lacquer.
- the surface coating layer can be produced on a surface of the steel strip substrate by means of an electric plating or a vacuum evaporation plating procedure in the presence of fine inorganic dispersoid particles.
- the electric plating method is applied to the production of the surface coating layer.
- the electric plating procedure is carried out in a plating bath containing sulfate or chloride of zinc and at least one additional metal having a pH of 1 to 3 at a current density of 1 to 200 A/dm 2 at a line speed of 1 to 250 m/min.
- the inorganic dispersoid particles are deposited in the plated metal matrix. It is assumed that the dispersoid particles are deposited due to the attraction caused by static electricity or the mechanical force applied thereto.
- the intermediate coating layer can be produced by means of electric plating, vacuum evaporation plating, or hot galvanizing.
- the zinc-plated steel strip of the present invention may have only one surface coating layer formed on only one surface of the substrate, two surface coating layers formed on both the surfaces of the substrate, or a combination of a surface coating layer and an intermediate coating layer formed on only one surface of the substrates or on each surface of the substrate.
- the other surface of the substrate may be plated with a coating layer other than the surface coating layer and the intermediate coating layer of the present invention or with the same coating layer as the intermediate coating layer of the present invention.
- the resistance of a specimen to corrosion was determined as follows.
- a specimen was subjected to a dipping type chemical conversion treatment with zinc phosphate.
- the treatment specimen was coated with a cathodic ED coating layer having a thickness of 20 pm.
- the painted specimen was subjected to a cyclic corrosion test (CCT) in which a salt spray test was combined with a drying-wetting-cooling test.
- CCT cyclic corrosion test
- the specimen was tested for perforation corrosion of the processed portion of the steel strip was of a lapped panel. This test was carried out over 4 weeks, and the maximum depth of pits formed in the specimen was measured. The workability of the specimen was evaluated by a deep drawing test.
- the resistance of the deep drawn specimen to powdering was determined by a tape test.
- the weldability of the specimen was determined as follows. Two zinc-plated specimens were laid back to back with the plated surfaces outside. These were then spot-welded. The size of the nuggets formed in the welded portion was measured to determine the appropriate welding current for the specimens.
- the surface rusting test was carried out by a cross-cut method.
- the paint adhesion of the scratched portion of the specimen was determined by a cross-cut method in which the cross-cut specimen was subjected to the CCT for 4 weeks and the maximum width of blisters formed in the specimen was measured.
- the results of the above-mentioned tests were evaluated as follows:
- the content of the inorganic dispersoid particles in the surface coating layer be 0.01 % or more, based on the entire weight of the surface coating layer, in order to enhance the weldability of the plated steel strip.
- Tn view of Examples 17 to 23 it is preferable for the purpose of improving the perforation corrosion resistance of the processed portion of the plated steel strip to control the content of the inorganic dispersoid particles to a level not exceeding 95% based on the entire weight of the surface coating layer.
- Example 34 to 164 except for Examples 116, 118, and 120 to 140, a surface of a substrate consisting of an ordinary steel strip was plated with an intermediate coating layer having the composition and thickness as shown in Table 2 (1) to (9) and then with a surface coating layer having the composition and thickness shown in Table 2.
- Comparative Examples 1 to 6 the same substrate as that mentioned above was plated with an intermediate coating layer and then with a surface coating layer each having the composition and thickness in Table 2(7).
- Example 116 a surface of the substrate was covered partially with the intermediate coating layer at a covering rate of 50%.
- Comparative Example 1 wherein the intermediate coating layer contains Si0 2 particles whereas the surface coating layer is free from the inorganic dispersoid particles, the resultant plated steel strip exhibited a very poor perforation corrosion resistance, whereas the paint adhesion of the scratched portion to lacquer was excellent.
- the surface coating layer contained no inorganic dispersoid. This feature resulted in poor weldability of the resultant plated steel strip.
- the preferable dispersoids for the zinc-nickel alloy matrix in the surface coating layer are oxides of aluminum, iron, titanium, and silicon.
- the preferable metals to be alloyed with zinc in the surface coating layer are nickel, cobalt, chromium, iron, and manganese.
- the resultant plated steel strips having an intermediate coating layer consisting of zinc or a zinc alloy and a surface coating layer containing dispersoid particles consisting of Si0 2 and having an average size of 5 microns or less exhibited excellent corrosion resistance, workability, and weldability and, therefore, are most preferable products of the present invention.
- the preferable thickness of the surface coating layer is in the range of from 0.1 to 40 microns. Also, in view of Examples 141 to 145, it is preferable that the thickness of the intermediate coating layer is in the range of from 0.1 to 20 microns.
- Examples 116 and 117 showed that the plated steel strips having surface and intermediate coating layers or a surface coating layer in the form of a plurality of stripes are satisfactory.
Description
- The present invention relates to a zinc-plated steel strip with a zinc-based coating layer containing an inorganic dispersoid. More particularly, the present invention relates to a zinc-plated steel strip having at least one zinc-based coating layer containing fine inorganic dispersoid particles and formed on at least one surface of the steel strip, which zinc-plated steel strip exhibits excellent resistance to corrosion, enhanced workability, and superior weldability and is useful for producing cars, building and construction materials, and home electric appliances.
- Generally, surface-treated steel strips are required to exhibit a high resistance to corrosion not only before but also after being painted. That is, surface coated steel strips have to exhibit a satisfactory paint adhesion and satisfactory resistances to perforation corrosion and to red rust when the paint film layer is scratched.
- Also, surface-treated steel strips must exhibit excellent workability and weldability.
- In response to the above-mentioned requirements, various types of plated steel strips having zinc-based coating layers are used, and there have been various attempts to improve plated steel strips having zinc-based coating layers.
- Japanese Examined Patent Publication No. 56-49999 discloses a plated steel strip having an electroplating layer comprising a matrix consisting of zinc alone and 2.0 to 15% of Si02 particles, and optionally, an electroplating surface layer consisting of 1 g/m2 or more of zinc alone.
- Japanese Examined Patent Publication No. 57-17960 discloses a plated steel strip having a base plating layer consisting of zinc alone and a surface plating layer comprising a matrix consisting of Mn alone and particles consisting of at lesat one member selected from metallic Ni, Cu, AI and Cr and oxides of Ti, AI and Mg, and having a thickness of 0.1 µm or more.
- Japanese Examined Patent Publication No. 46-37882 discloses a plated light metal article having a base plating layer consisting of zinc alone and a surface electroplating layer comprising a matrix consisting of nickel alone and a dispersoid consisting of solid particles having a size of 1 1l[11 or less and located in the surface portion of the surface electroplating layer.
- Japanese Unexamined Patent Publication No. 56-123,395 discloses a plated steel strip having an electroplating layer comprising a matrix consisting of zinc alone or a Ni-Zn alloy and chromium hydrate particles having a size of 0.3 pm or more and dispersed in the surface portion of the layer with a depth of 0.3 pm from the surface of the layer.
- Japanese Unexamined Patent Publication No. 52-109,439 discloses a plated metal article having a base electroplating layer consisting of nickel alone and a surface electroplating layer comprising a nickel matrix and silicon carbide particles. However, the resultant plated steel strips are not always satisfactory in view of the strict requirements mentioned above.
- Under the above-mentioned circumstances, it is strongly desired to provide a new type of plated steel strip which exhibits excellent resistance to corrosion after painting and high resistances to perforation corrosion and powdering after processing.
- JP-A-79 159 342 discloses a process for producing a corrosion resistant plated composite steel strip in which a surface of a steel strip substrate is coated with an electroplating layer comprising a matrix consisting of zinc and fine particles consisting of Si02 sol, Ti02 sol and Zr02 sol, and dispersed in the zinc matrix.
- JP-A-79 146 228 discloses a plated steel strip in which a cold-rolled steel strip substrate is coated with an electroplating base layer consisting of a matrix consisting of zinc alone and Si02 fine particles, and the base layer is coated with an electroplating surface layer consisting of zinc alone.
- Metal Finishing Abstracts, vol. 22, No. 6, November/December 1980, page 292 discloses a plated steel strip comprising a steel strip substrate, an under-coating layer composed of a matrix consisting of zinc alone and AI203 particles dispersed in the matrix, and an upper coating layer consisting of chromium alone.
- An object of the present invention is to provide a zinc-plated steel strip which exhibits excellent resistance to corrosion even after the plated steel strip is painted and the paint film layer is scratched.
- Another object of the present invention is to provide a zinc-plated steel strip which exhibits excellent workability and weldability.
- The above-mentioned objects can be attained by the zinc-plated steel strip with a zinc-based coating layer of the present invention, which comprises a substrate consisting of a steel strip and at least one surface coating layer plated on at least one portion of at least one surface of the steel strip substrate, the surface coating layer consisting essentially of a matrix consisting of at least one zinc alloy and fine dispersoid particles dispersed in the matrix and consisting of at least one member selected from the group consisting of oxides, carbides, nitrides, borides, phosphides, and sulfides of aluminum, iron, titanium, molybdenum, copper, zinc, nickel, cobalt, lanthanum, cerium and silicon.
- The zinc-plated steel strip of the present invention may further comprise an intermediate coating layer formed between the steel strip substrate and the surface coating layer and consisting of at least one member selected from the group consisting of zinc and zinc alloys.
- It was found that a zinc alloy-surface coating layer plated on a surface of a steel strip and containing specific inorganic dispersoid particles is highly effective for enhancing resistance of the steel strip to corrosion, especially perforation corrosion after the plated steel strip is painted and processed. The reasons for the special effect of the above-mentioned specific zinc alloy coating layer are not completely clear. It is assumed, however, that the specific inorganic dispersoid particles in the surface coating layer form a sort of a barrier against the corrosion so as to restrict undesirable corrosional oxidation-reduction reaction in the coating layer. Also, it was found by the inventors of the present invention that the surface coating layer containing the specific fine inorganic dispersoid particles is effective for enhancing the weldability, especially spot weldability, of the plated steel strip.
- Furthermore, it was found by the inventors of the present invention that an intermediate coating layer. consisting of zinc or zinc alloy and formed between the steel strip substrate and the surface coating layer containing the specific inorganic dispersoid particles is highly effective for enhancing the specific effects of the surface coating layer, especially, for enhancing the resistance to perforation corrosion of the processed portion and the workability, of the plated steel strip.
- The term "workability of the plated steel strip" refers to a resistance of the plated steel strip to powdering of the coating layer, that is, peeling of the coating layer from the substrate when processed.
- The reasons for the above-mentioned effects of the intermediate coating layer are not clear. It is supposed, however, that the surface coating layer and the intermediate coating layer have a synergistic effect on, the plated steel strip. Also, it is supposed that the intermediate coating layer exhibits a special type of lubricating effect between the substrate and the surface coating layer.
- In the zinc-plated steel strip of the present invention, a substrate consisting of a steel strip has at least one plated surface coating layer consisting essentially of a matrix consisting of a plated zinc alloy and fine dispersoid particles dispersed in the matrix and consisting of at least one member selected from oxides, carbides, nitrides, borides, phosphides and sulfides of aluminum (AI), iron (Fe), titanium (Ti), molybdenum (Mo), copper (Cu), zinc (Zn), nickel (Ni), cobalt (Co), lanthanum (La), cerium (Ce), and silicon (Si).
- The steel strip usable as a substrate for the present invention is not limited to specific types of steel strips. However, usually, the steel strip is preferably selected from ordinary steel strips, AI-killed steel strips and high tensile steel strips.
- As stated above, when the above-mentioned specific inorganic dispersoid particles are contained in the zinc alloy matrix, the resultant surface coating layer exhibits an excellent effect in enhancing the resistance to corrosion and workability and weldability of the plated steel strip. These effects of the surface coating layer of the present invention are excellent compared with those of other zinc or zinc alloy coating layers which are free from the specific inorganic dispersoid or contain other dispersoids.
- In the zinc-plated steel strips of the present invention, it is preferable that the surface coating layer be in an amount of from 1 to 400 g/m2, and has a thickness of from 0.1 to 40 pm.
- In the surface coating layer, the matrix consists of a zinc alloy. The zinc alloy is preferably selected from alloys of from 20% to 99.7% by weight of zinc with 0.3% to 80% by weight of at least one additional metal member selected from the group consisting of nickel, copper, cobalt, chromium, tellurium, lanthanium, cerium, iron, and manganese.
- In the zinc alloy, the above-mentioned specific additional metal in a content of from 0.3% to 80% by weight is effective for enhancing the paint adhesion of the surface coating layer to the steel strip substrate surface when the surface coating layer is scratched and for improving the resistance of the surface coating layer to corrosion, especially, to perforation corrosion within a strict corrosional environment.
- In the surface coating layer, the amount of inorganic dispersoid is preferably 0.01% or more, more preferably from 0.01 % to 95%, still more preferably from 0.01 % to 30%, based on the entire weight of the surface coating layer.
- When the amount of the inorganic dispersoid in the surface coating layer is less than 0.01 %, the resultant plated steel strip exhibits unsatisfactory weldability.
- When the plated steel strip is required to exhibit extremely high resistance to corrosion, in view of the sacrifice corrosion control effect of the zinc alloy, it is preferable that the content of the inorganic dispersoid does not exceed 95% based on the entire weight of the surface coating layer. Also, when the plated steel strip is required to have excellent resistance to powdering after the plated steel strip is strictly processed, it is preferable to limit the content of the inorganic dispersoid to 30% or less based on the entire weight of the surface coating layer.
- The fine inorganic dispersoid particles in the surface coating layer preferably have an average size of 5 microns or less, preferably, from 0.01 to 1 Ilm. Fine inorganic dispersoid particles having an average size of 51lm or less are highly effective for enhancing the resistance of the resultant plated steel strip to powdering when the strip is subjected to severe processing. The term "average size" refers to a size of the particles in a largest distribution percentage.
- The surface coating layer of the present invention may cover the entire surface of the steel strip substrate. Otherwise, the surface of the steel strip substrate may be partially covered by the surface coating layer, for example, in the form of a plurality of stripes.
- In the zinc-plated steel strip of the present invention, an intermediate coating layer consisting of zinc or a zinc alloy may be formed between the steel strip substrate and the surface coating layer.
- The intermediate coating layer may be formed so as to partially cover or entirely cover the surface of the steel strip substrate. The intermediate coating layer consists of zinc or a zinc alloy. Preferably, the zinc alloy is selected from alloys of 20% to 99% by weight of zinc and 1 % to 80% by weight of at least one metal other than zinc, preferably selected from the group consisting of nickel, cobalt, chromium, iron, and molybdenum.
- The intermediate coating layer is preferably in an amount of from 0.5 to 400 g/m2, more preferably, from 1 to 200 g/m2, and preferably has a thickness of from 0.1 to 20 pm.
- The surface coating layer in the zinc-plated steel strip of the present invention may have a covering layer formed thereon by means of a silane-coupling treatment or a chemical conversion treatment.
- The term "silane-coupling treatment" refers to a treatment of the surface of the surface coating layer with a silane-coupling agent, for example, vinylchlorosilane or vinyltrimethoxysilane. The term "chemical conversion treatment" refers to a phosphate treatment or a chromate treatment applied to the surface coating layer of the plated steel strip.
- The silane-coupling treatment and chemical conversion treatment are effective for enhancing the primary adhering property of the surface of the plated steel strip to lacquer.
- The surface coating layer can be produced on a surface of the steel strip substrate by means of an electric plating or a vacuum evaporation plating procedure in the presence of fine inorganic dispersoid particles. Preferably, the electric plating method is applied to the production of the surface coating layer. For example, the electric plating procedure is carried out in a plating bath containing sulfate or chloride of zinc and at least one additional metal having a pH of 1 to 3 at a current density of 1 to 200 A/dm2 at a line speed of 1 to 250 m/min.
- In the production of the surface coating layer, it is not completely clear how the inorganic dispersoid particles are deposited in the plated metal matrix. It is assumed that the dispersoid particles are deposited due to the attraction caused by static electricity or the mechanical force applied thereto.
- The intermediate coating layer can be produced by means of electric plating, vacuum evaporation plating, or hot galvanizing.
- The zinc-plated steel strip of the present invention may have only one surface coating layer formed on only one surface of the substrate, two surface coating layers formed on both the surfaces of the substrate, or a combination of a surface coating layer and an intermediate coating layer formed on only one surface of the substrates or on each surface of the substrate.
- When one surface of the substrate has a surface coating layer or a combination of an intermediate coating layer and a surface coating layer, the other surface of the substrate may be plated with a coating layer other than the surface coating layer and the intermediate coating layer of the present invention or with the same coating layer as the intermediate coating layer of the present invention.
- The present invention will be further explained by way of specific examples, which, however, are representative and do not restrict the scope of the present invention in any way.
- In the examples, the resistance of a specimen to corrosion was determined as follows.
- A specimen was subjected to a dipping type chemical conversion treatment with zinc phosphate. The treatment specimen was coated with a cathodic ED coating layer having a thickness of 20 pm.
- The painted specimen was subjected to a cyclic corrosion test (CCT) in which a salt spray test was combined with a drying-wetting-cooling test.
- The specimen was tested for perforation corrosion of the processed portion of the steel strip was of a lapped panel. This test was carried out over 4 weeks, and the maximum depth of pits formed in the specimen was measured. The workability of the specimen was evaluated by a deep drawing test.
- The resistance of the deep drawn specimen to powdering was determined by a tape test.
- The weldability of the specimen was determined as follows. Two zinc-plated specimens were laid back to back with the plated surfaces outside. These were then spot-welded. The size of the nuggets formed in the welded portion was measured to determine the appropriate welding current for the specimens.
- The surface rusting test was carried out by a cross-cut method.
- The paint adhesion of the scratched portion of the specimen was determined by a cross-cut method in which the cross-cut specimen was subjected to the CCT for 4 weeks and the maximum width of blisters formed in the specimen was measured. The results of the above-mentioned tests were evaluated as follows:
- In each of Examples 1 to 33, a surface of a substrate consisting of an ordinary steel strip was plated with a surface coating layer as shown in detail in Table 1(1), (2), and (3). The properties of the resultant plated steel strips are also shown in Table 1(1), (2), and (3).
- In view of Examples 18 to 24, it is preferable that the content of the inorganic dispersoid particles in the surface coating layer be 0.01 % or more, based on the entire weight of the surface coating layer, in order to enhance the weldability of the plated steel strip.
- In view of Examples 17 to 21, it is preferable for the purpose of enhancing the powdering resistance of the plated steel strip to control the content of the inorganic dispersoid particle to a level not exceeding 30% based on the entire weight of the surface coating layer.
- Tn view of Examples 17 to 23, it is preferable for the purpose of improving the perforation corrosion resistance of the processed portion of the plated steel strip to control the content of the inorganic dispersoid particles to a level not exceeding 95% based on the entire weight of the surface coating layer.
- In view of Examples 25 to 33, it is preferable for the purpose of enhancing the adhering property of scratched portion of the plated steel strip to control the content of the inorganic dispersoid particles to the level of 0.3% or more based on the entire weight of the surface coating layer. Also, it is preferable for the purpose of enhancing the pitting corrosion resistance and rust resistance to limit the content of the inorganic dispersoid particles to a level not exceeding 80% based on the entire weight of the surface coating layer.
- In each of Examples 34 to 164, except for Examples 116, 118, and 120 to 140, a surface of a substrate consisting of an ordinary steel strip was plated with an intermediate coating layer having the composition and thickness as shown in Table 2 (1) to (9) and then with a surface coating layer having the composition and thickness shown in Table 2.
- In each of Examples 116, 118, and 120 to 140, the same substrate as that mentioned above was directly plated with a surface coating layer having the composition and thickness as indicated in Table 2.
- In Comparative Examples 1 to 6, the same substrate as that mentioned above was plated with an intermediate coating layer and then with a surface coating layer each having the composition and thickness in Table 2(7).
- In Comparative Examples 7 to 9, the same substrate as that mentioned above was plated directly with the surface coating layer as shown in Table 2(9).
- In Example 116, a surface of the substrate was covered partially with the intermediate coating layer at a covering rate of 50%.
- In each of Examples 118 and 119, the surface of the surface coating layer was treated with a silane-coupling agent.
- In Comparative Example 1, wherein the intermediate coating layer contains Si02 particles whereas the surface coating layer is free from the inorganic dispersoid particles, the resultant plated steel strip exhibited a very poor perforation corrosion resistance, whereas the paint adhesion of the scratched portion to lacquer was excellent.
- In Comparative Example 2, dispersoid particles consisting of Cr203 resulted in a poor weldability of the resultant plated steel strip.
- In Comparative Examples 3 and 4, a surface coating layer matrix consisting of nickel or manganese resulted in a poor perforation corrosion resistance of the resultant plated steel strip.
- In each of Comparative Examples 5 and 6, the surface coating layer contained no inorganic dispersoid. This feature resulted in poor weldability of the resultant plated steel strip.
- In each of Comparative Examples 7 and 9 the dispersoid consisting of Zr02 or Cr203 resulted in poor powdering resistance and weldability of the resultant plated steel strip.
- In Comparative Example 8, the dispersoid consisting of WC resulted in a poor paint adhesion and in poor weldability of the resultant plated steel strip.
- In view of Examples 120 to 129, the preferable dispersoids for the zinc-nickel alloy matrix in the surface coating layer are oxides of aluminum, iron, titanium, and silicon.
- In view of Examples 130 and 136, the preferable metals to be alloyed with zinc in the surface coating layer are nickel, cobalt, chromium, iron, and manganese.
- In view of Examples 58 to 69, and 92 to 97, the resultant plated steel strips having an intermediate coating layer consisting of zinc or a zinc alloy and a surface coating layer containing dispersoid particles consisting of Si02 and having an average size of 5 microns or less exhibited excellent corrosion resistance, workability, and weldability and, therefore, are most preferable products of the present invention.
- In view of Examples 98 to 104, the preferable thickness of the surface coating layer is in the range of from 0.1 to 40 microns. Also, in view of Examples 141 to 145, it is preferable that the thickness of the intermediate coating layer is in the range of from 0.1 to 20 microns.
- In view of Examples 107 to 115, it is known that in the surface coating layer matrix consisting of a zinc alloy, when the content of the additional metal to be alloyed with zinc is 0.3% by weight or more, the resultant plated steel strip exhibited an enhanced paint adhesion of a scratched portion. When the content of the additional metal is 80% by weight or less, the processed portion of the plated steel strip exhibited an excellent perforation corrosion resistance.
- Examples 116 and 117 showed that the plated steel strips having surface and intermediate coating layers or a surface coating layer in the form of a plurality of stripes are satisfactory.
-
Claims (15)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59185300A JPS6164899A (en) | 1984-09-06 | 1984-09-06 | Zn composite plated steel sheet |
JP185300/84 | 1984-09-06 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0174019A1 EP0174019A1 (en) | 1986-03-12 |
EP0174019B1 true EP0174019B1 (en) | 1989-03-01 |
Family
ID=16168441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85111166A Expired EP0174019B1 (en) | 1984-09-06 | 1985-09-04 | Steel strip plated with a zinc-based coating layer containing an inorganic dispersoid |
Country Status (3)
Country | Link |
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EP (1) | EP0174019B1 (en) |
JP (1) | JPS6164899A (en) |
DE (1) | DE3568459D1 (en) |
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1984
- 1984-09-06 JP JP59185300A patent/JPS6164899A/en active Granted
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1985
- 1985-09-04 EP EP85111166A patent/EP0174019B1/en not_active Expired
- 1985-09-04 DE DE8585111166T patent/DE3568459D1/en not_active Expired
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US7250076B2 (en) | 2000-11-13 | 2007-07-31 | Dacral | Use of MoO3 as corrosion inhibitor, and coating composition containing such an inhibitor |
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DE3568459D1 (en) | 1989-04-06 |
JPS6164899A (en) | 1986-04-03 |
JPS6316479B2 (en) | 1988-04-08 |
EP0174019A1 (en) | 1986-03-12 |
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