# US 11,028,276 B2 · Surface-treated metal sheet, coated member, and method for producing coated member

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- Number: US 11,028,276 B2
- Document ID: US11028276B2
- Status: Granted
- Kind: B2
- Application number: 15/560,847
- Filed: 2016-03-30
- Published: 2018-04-26
- Granted: 2021-06-08
- Earliest claimed: 2015-03-31
- Assignees: Nippon Steel Corporation
- Applicants: Nippon Steel & Sumitomo Metal Corporation
- Inventors: Yasuaki Kawamura; Koji Akioka; Akihiro Sengoku; Yoichiro Mori
- Web page: https://patentgrep.com/patent/US11028276B2

## CPC

- C09D 5/24: Electrically-conducting paints {(conductive materials H01B1/00)}
- B05D 7/14: to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23)
- B32B 15/08: of synthetic resin
- C09D 5/02: Emulsion paints {including aerosols}
- C09D 5/028: {Pigments; Filters}
- C09D 5/08: Anti-corrosive paints
- C09D 5/084: {Inorganic compounds}
- C09D 5/10: containing metal dust
- C09D 7/40: Additives
- C09D 7/61: inorganic
- C09D 7/62: modified by treatment with other compounds
- C09D 167/00: Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain (based on polyester-amides C09D177/12; based on polyester-imides C09D179/08); Coating compositions based on derivatives of such polymers
- C09D 175/04: Polyurethanes
- C09D 201/00: Coating compositions based on unspecified macromolecular compounds
- C23C 22/12: containing zinc cations
- C23C 22/78: Pretreatment of the material to be coated
- C23C 28/00: Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C25D 5/48: After-treatment of electroplated surfaces
- C25D 13/22: Servicing or operating {apparatus or multistep processes}
- C08K 3/08: Metals
- C08K 3/14: Carbides
- C08K 3/22: of metals
- C08K 3/28: Nitrogen-containing compounds
- C08K 3/32: Phosphorus-containing compounds
- C08K 3/34: Silicon-containing compounds
- C08K 3/36: Silica
- C08K 2003/0856: {Iron}
- C08K 2003/2206: {of calcium, strontium or barium}
- C08K 2003/222: {Magnesia, i.e. magnesium oxide}
- C08K 2003/2296: {of zinc}
- C08K 2003/327: {Aluminium phosphate}
- C08K 2201/001: Conductive additives
- C08K 2201/014: Additives containing two or more different additives of the same subgroup in C08K
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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 (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Provided are a surface-treated metal sheet excellent in the adhesiveness to a coating treatment film and weldability and a coated member. The surface-treated metal sheet includes a metal sheet and a coating film placed on at least one major surface of the metal sheet; the coating film contains oxide particles, a binder resin, and electrically conductive particles; the amount of electrically conductive particles contained is 5 to 30 mass % relative to the coating film; the oxide particles include non-doped oxide particles and/or doped oxide particles; the non-doped oxide particles include at least one kind selected from the group consisting of zinc oxide particles, tin oxide particles, magnesium oxide particles, calcium oxide particles, and strontium oxide particles; the doped oxide particles include at least one kind selected from the group consisting of doped zinc oxide particles and doped tin oxide particles; the amount of oxide particles contained is 1 to 30 mass %, but is 1 to 10 mass % relative to the coating film in the case of not including doped oxide particles; and the amount of the coating film attached to the major surface is 2 to 20 g/m2.

## Claims

### Claim 1

A coated member comprising:
a molded material formed from a surface-treated metal sheet as a material, the surface-treated metal sheet comprising:
a metal sheet; and
a coating film placed on at least one major surface of the metal sheet,
wherein the coating film contains oxide particles, a binder resin, and electrically conductive particles,
the electrically conductive particles consist of non-oxide ceramic particles and at least one kind selected from the group consisting of iron alloy particles and stainless steel particles,
a mass ratio between the non-oxide ceramic particles and the at least one kind selected from the group consisting of the iron alloy particles and the stainless steel particles (the non-oxide ceramic particles/the at least one kind selected from the group consisting of the iron alloy particles and the stainless steel particles) is 1/9 to 8/2,
an amount of the electrically conductive particles contained is 5 to 30 mass % relative to the coating film,
the oxide particles include non-doped oxide particles and/or doped oxide particles,
the non-doped oxide particles include at least one kind selected from the group consisting of zinc oxide particles, tin oxide particles, magnesium oxide particles, calcium oxide particles, and strontium oxide particles,
the doped oxide particles include at least one kind selected from the group consisting of doped zinc oxide particles and doped tin oxide particles,
an amount of the oxide particles contained is 1 to 30 mass % relative to the coating film in a case where the oxide particles include the doped oxide particles, and is 1 to 10 mass % relative to the coating film in a case where the oxide particles do not include the doped oxide particles,
an amount of the coating film attached to the major surface is 2 to 20 g/m2, and
an average particle diameter of the oxide particles is 0.2 to 5 μm;
a chemical conversion treatment covering film located on the coating film of the molded material; and
a coating treatment film located on the chemical conversion treatment covering film.

### Claim 2 (depends on 1)

The coated member according to claim 1, wherein the binder resin is a water-soluble or water-dispersible water-based resin.

### Claim 3 (depends on 1)

The coated member according to claim 1, wherein the coating film further contains anti-corrosion particles.

### Claim 4 (depends on 3)

The coated member according to claim 3, wherein the anti-corrosion particles contain at least one selected from the group consisting of:
aluminum tripolyphosphate;
Zn, Mg, Al, Ti, Zr, and Ce salts of phosphoric acid and phosphorous acid;
a hydrocalumite-treated phosphoric acid compound;
Ca ion exchange silica, and
amorphous silica with an oil absorption of 100 to 1000 ml/100 g, a specific surface area of 200 to 1000 m2/g, and an average particle diameter of 2.0 to 30 μm.

### Claim 5 (depends on 4)

The coated member according to claim 4, wherein the oxide particles include the doped oxide particles, and the aluminum tripolyphosphate is aluminum tripolyphosphate containing Mg.

### Claim 6 (depends on 1)

The coated member according to claim 1, wherein the metal sheet is a zinc-based plated steel sheet or an aluminum-based plated steel sheet.

### Claim 7 (depends on 1)

The coated member according to claim 1, wherein the mass ratio between the non-oxide ceramic particles and the at least one kind selected from the group consisting of the iron alloy particles and the stainless steel particles (the non-oxide ceramic particles/the at least one kind selected from the group consisting of the iron alloy particles and the stainless steel particles) is 1/9 to 7/3.

### Claim 8 (depends on 1)

The coated member according to claim 1, wherein the mass ratio between the non-oxide ceramic particles and the at least one kind selected from the group consisting of the iron alloy particles and the stainless steel particles (the non-oxide ceramic particles/the at least one kind selected from the group consisting of the iron alloy particles and the stainless steel particles) is 1/9 to 6/4.

### Claim 9 (depends on 1)

The coated member according to claim 1, wherein the mass ratio between the non-oxide ceramic particles and the at least one kind selected from the group consisting of the iron alloy particles and the stainless steel particles (the non-oxide ceramic particles/the at least one kind selected from the group consisting of the iron alloy particles and the stainless steel particles) is 1/9 to 5/5.

### Claim 10 (depends on 1)

A method for producing the coated member according to claim 1, comprising:
a step of performing chemical conversion treatment on the molded material obtained by molding the surface-treated metal sheet and forming a chemical conversion treatment covering film on the coating film; and
a step of forming a coating treatment film on the chemical conversion treatment covering film.