# US 9,752,222 B2 · Steel sheet for container having excellent organic film performance and process for producing the same

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- Number: US 9,752,222 B2
- Document ID: US9752222B2
- Status: Granted
- Kind: B2
- Application number: 14/548,706
- Filed: 2014-11-20
- Published: 2015-03-26
- Granted: 2017-09-05
- Earliest claimed: 2011-01-18
- Assignees: Nippon Steel & Sumitomo Metal Corporation
- Applicants: Nippon Steel & Sumitomo Metal Corporation
- Inventors: Shigeru Hirano; Akira Tachiki; Hirokazu Yokoya
- Web page: https://patentgrep.com/patent/US9752222B2

## CPC

- C23C 2/04: characterised by the coating material
- C23C 2/28: Thermal after-treatment, e.g. treatment in oil bath
- C23C 22/34: containing fluorides or complex fluorides
- C23C 22/361: {containing titanium, zirconium or hafnium compounds}
- C25D 3/54: of metals not provided for in groups C25D3/04 - C25D3/50
- C25D 5/48: After-treatment of electroplated surfaces
- C25D 7/00: Electroplating characterised by the article coated
- C25D 9/10: on iron or steel
- C25D 11/36: Phosphatising
- Y10T 428/24942: including components having same physical characteristic in differing degree
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A surface-treated steel sheet for a container, comprising: a steel sheet, and a Zr compound film disposed on the steel sheet, wherein the Zr compound film being formed by a dipping or electrolytic treatment in a solution containing Zr ion, F ion, ammonium ion and nitrate ion; and the coating weight of the Zr compound film is 1 to 100 mg/m2 in terms of the amount of metallic Zr, and 0.1 mg/m2 or less in terms of the F amount. There is provided a steel sheet for container, which has an excellent processability in the can manufacturing, and at the same time, is excellent in drawing and ironing processability, weldability, corrosion resistance, adherence thereof to a coating material and adherence thereof to a film, and a process for producing such a steel sheet for container.

## Claims

### Claim 1

A process for producing a surface-treated steel sheet for a container, comprising:
forming a Zr compound film on a steel sheet, to thereby dispose the Zr compound film on the steel sheet; and then
performing a washing treatment by a dipping treatment or a spraying treatment for 0.5 seconds or more with warm water at 40° C. or more,
wherein the Zr compound film is formed by a dipping or electrolytic treatment in a solution containing Zr ion, F ion, ammonium ion and nitrate ion;
wherein the coating weight of the Zr compound film is 1 to 100 mg/m2 in terms of the amount of metallic Zr, and 0.1 mg/m2 or less in terms of the F amount; and
wherein the solution further contains a phenol resin,
the Zr compound film further contains the phenol resin, and
the coating weight of the phenol resin within the Zr compound film is 8 to 50 mg/m2 in terms of the C amount.

### Claim 2 (depends on 1)

The process for producing a surface-treated steel sheet for a container according to claim 1, wherein the solution further contains phosphate ion, and
the coating weight of the Zr compound film is further 0.1 to 50 mg/m2 in terms of the P amount.

### Claim 3 (depends on 1, 2)

The process for producing a surface-treated steel sheet for a container according to claim 1 or 2, wherein the steel sheet is a surface-treated steel sheet having on at least one surface thereof a surface treating layer containing 10 to 1,000 mg/m2 of Ni, or from 100 to 15,000 mg/m2 of Sn.

### Claim 4 (depends on 1)

The process for producing a surface-treated steel sheet for a container according to claim 1, wherein the coating weight of the Zr compound film is 0.09 mg/m2 or less in terms of the F amount.

### Claim 5 (depends on 1)

The process for producing a surface-treated steel sheet for a container according to claim 1, wherein the coating weight of the Zr compound film is 0.04 mg/m2 or less in terms of the F amount.

### Claim 6 (depends on 1)

The process for producing a surface-treated steel sheet for a container according to claim 1, wherein the coating weight of the Zr compound film is 0.02 mg/m2 or less in terms of the F amount.

### Claim 7 (depends on 1)

The process for producing a surface-treated steel sheet for a container according to claim 1, wherein the coating weight of the Zr compound film is 0.01 mg/m2 or less in terms of the F amount.