# US 2013/0157076 A1 · Chemical conversion coated plated steel sheet and method for producing same

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- Number: US 2013/0157076 A1
- Document ID: US20130157076A1
- Status: Published application
- Kind: A1
- Application number: 13/704,868
- Filed: 2011-06-17
- Published: 2013-06-20
- Earliest claimed: 2010-06-18
- Assignees: Nisshin Steel Co., Ltd.
- Inventors: Masanori Matsuno; Koichiro Ueda; Masaya Yamamoto; Hirofumi Taketsu
- Web page: https://patentgrep.com/patent/US20130157076A1

## CPC

- C23C 22/00: Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- B05D 3/007: {After-treatment}
- C09D 5/08: Anti-corrosive paints
- C09D 127/12: containing fluorine atoms
- C09D 127/22: modified by chemical after-treatment
- C23C 22/34: containing fluorides or complex fluorides
- C23C 22/361: {containing titanium, zirconium or hafnium compounds}
- C23C 22/364: {containing also manganese cations}
- C23C 22/44: containing also fluorides or complex fluorides
- C23C 22/60: using alkaline aqueous solutions with pH greater than 8
- C23C 22/83: Chemical after-treatment
- 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
- C23C 2222/20: Use of solutions containing silanes
- Y10T 428/12549: Adjacent to each other
- Y10T 428/12569: Synthetic resin
- Y10T 428/1266: O, S, or organic compound in metal component
- Y10T 428/12757: Fe
- Y10T 428/265: 1 mil or less
- 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)
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed is a chemical conversion coated Al-plated steel sheet which has excellent weather resistance, water resistance and coating film adhesion. Specifically, a chemical conversion coating liquid is applied over and dried on the surface of an Al alloy-plated steel sheet, thereby forming a chemical conversion coating film that has a film thickness of 0.5-10 μm. The chemical conversion coating liquid contains: a fluorine-containing olefin resin, which contains 7-20% by mass of F atoms and 0.05-5% by mass of hydrophilic functional groups that are selected from among a carboxyl group, a sulfonic acid group and salts of carboxyl group and sulfonic acid group and has a number average molecular weight within the range of 1,000-2,000,000; and an oxygen acid salt, fluoride, hydroxide, organic acid salt, carbonate or peroxygenated salt of a group 4A metal.

## Claims

### Claim 1

A chemically treated aluminum-based plated steel sheet, comprising:
an aluminum-based alloy plated steel sheet, the aluminum-based alloy containing 85-99% by weight of aluminum; and
a chemical conversion film having a film thickness of 0.5-10 μm formed on a surface of the aluminum-based alloy plated steel sheet,
wherein the chemical conversion film contains a fluororesin containing 0.05-5% by weight of a hydrophilic functional group selected from the group consisting of a carboxyl group and a sulfonic acid group and 7-20% by weight of a fluorine atom, and 0.1-5% by weight in terms of a metal with respect to the fluororesin of a group 4A metal compound.

### Claim 2 (depends on 1)

The chemically treated aluminum-based plated steel sheet according to claim 1, wherein a ratio between the carboxyl group and the sulfonic acid group included in the fluororesin in terms of a carboxyl group/sulfonic acid group molar ratio is 5-60.

### Claim 3 (depends on 1)

The chemically treated aluminum-based plated steel sheet according to claim 1, wherein the chemical conversion film further contains a phosphate, and an amount of the phosphate with respect to the fluororesin is within a range of 0.05-3% by weight in terms of phosphorus.

### Claim 4 (depends on 1)

The chemically treated aluminum-based plated steel sheet according to claim 1, wherein the chemical conversion film further contains a silane coupling agent, and an amount of the silane coupling agent with respect to the fluororesin is within a range of 0.5-5% by weight.

### Claim 5 (depends on 1)

The chemically treated aluminum-based plated steel sheet according to claim 1, wherein the group 4A metal is selected from the group consisting of Ti, Zr, Hf, and any combination thereof.

### Claim 6 (depends on 1)

The chemically treated aluminum-based plated steel sheet according to claim 1, further comprising a preliminary chemical conversion film containing an oxide or hydroxide of a valve metal and fluoride of a valve metal, the preliminary chemical conversion film formed between the aluminum-based alloy plated steel sheet and the chemical conversion film.

### Claim 7

A method of preparing a chemically treated aluminum-based plated steel sheet, the method comprising:
preparing an aluminum-based alloy plated steel sheet, the aluminum-based alloy including 85-99% by weight of aluminum; and
forming a chemical conversion film that has a thickness 0.5-10 μm, by coating and drying a chemical treatment solution on a surface of the aluminum-based alloy plated steel sheet, wherein:
the chemical treatment solution contains a fluororesin containing 0.05-5% by weight of a hydrophilic functional group selected from the group consisting of a carboxyl group and a sulfonic acid group and 7-20% by weight of a fluorine atom, the fluororesin in which a number-average molecular weight of 1,000-2,000,000, and an oxoate, a fluoride, a hydroxide, an organic salt, a carbonate or a peroxygenated salt of a group 4A metal; and
an amount of the oxoate, the fluoride, the hydroxide, the organic salt, the carbonate or the peroxygenated salt of the group 4A metal is within a range of 0.1-5% by weight in terms of metal with respect to the fluororesin.

### Claim 8 (depends on 7)

The method of preparing the chemically treated aluminum-based plated steel sheet according to claim 7, wherein a ratio between the carboxyl group and the sulfonic acid group included in the fluororesin in terms of a carboxyl group/sulfonic acid group molar ratio is 5-60.

### Claim 9 (depends on 7)

The method of preparing the chemically treated aluminum-based plated steel sheet according to claim 7, wherein the chemical treatment solution further contains a phosphate, and an amount of the phosphate with respect to the fluororesin is within a range of 0.05-3% by weight in terms of phosphorus.

### Claim 10 (depends on 7)

The method of preparing the chemically treated aluminum-based plated steel sheet according to claim 7, wherein the chemical treatment solution further contains a silane coupling agent, and an amount of the silane coupling agent with respect to the fluororesin is within a range of 0.5-5% by weight.

### Claim 11 (depends on 7)

The method of preparing the chemically treated aluminum-based plated steel sheet according claim 7, wherein the group 4A metal compound is selected from the group consisting of Ti, Zr, Hf, and any combination thereof.

### Claim 12 (depends on 7)

The method of preparing the chemically treated aluminum-based plated steel sheet according to claim 7, further comprising:
forming a preliminary chemical conversion film by coating and drying a preliminary chemical treatment solution on a surface of the aluminum-based alloy plated steel sheet before forming the chemical conversion film, wherein the preliminary chemical treatment solution contains a valve metal salt and a fluoride ion.