# US 10,865,491 B2 · Sn-based alloy plated steel sheet

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- Number: US 10,865,491 B2
- Document ID: US10865491B2
- Status: Granted
- Kind: B2
- Application number: 16/302,903
- Filed: 2017-05-24
- Published: 2019-09-26
- Granted: 2020-12-15
- Earliest claimed: 2016-05-24
- Assignees: Nippon Steel Corporation
- Applicants: Nippon Steel & Sumitomo Metal Corporation
- Inventors: Shintaro Yamanaka; Shigeru Hirano; Morio Yanagihara; Hirokazu Yokoya
- Web page: https://patentgrep.com/patent/US10865491B2

## CPC

- C25D 9/06: by anodic processes
- B32B 15/013: {one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium}
- C25D 3/60: containing more than 50% by weight of tin
- C25D 5/12: at least one layer being of nickel or chromium
- C25D 5/48: After-treatment of electroplated surfaces
- C25D 5/50: by heat-treatment
- C25D 7/0614: {Strips or foils}
- C25D 9/08: by cathodic processes
- C25D 11/34: of metals or alloys not provided for in groups C25D11/04 - C25D11/32
- C25D 3/12: of nickel or cobalt
- C25D 3/32: characterised by the organic bath constituents used
- Y10T 428/12722: Next to Group VIII metal-base component
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The Sn-based alloy plated steel sheet of this disclosure includes: a steel sheet; a composite plating layer formed on at least one side of the steel sheet and including an Fe—Ni—Sn alloy layer and an island-shaped Sn layer located on the Fe—Ni—Sn alloy layer; and a coating layer formed on the surface of the composite plating layer and containing zirconium oxide and tin oxide, and the composite plating layer contains a predetermined amount of Ni and a predetermined amount of Sn, a content of the zirconium oxide in the coating layer is from 0.2 mg/m2 to 50 mg/m2 in terms of metal Zr amount, and a peak position of binding energy of Sn3d5/2 according to X-ray photoelectron spectroscopy of the tin oxide in the coating layer is 1.6 eV or higher than a peak position of binding energy of the metal Sn.

## Claims

### Claim 1

An Sn-based alloy plated steel sheet comprising:
a steel sheet;
a composite plating layer formed on at least one side of the steel sheet and including an Fe—Ni—Sn alloy layer and an island-shaped Sn layer located on the Fe—Ni—Sn alloy layer; and
a coating layer formed on the surface of the composite plating layer and containing zirconium oxide and tin oxide,
wherein the composite plating layer contains, from 2 mg/m2 to 200 mg/m2 of Ni in terms of metal Ni amount and from 0.1 g/m2 to 10 g/m2 of Sn in terms of metal Sn amount,
a content of the zirconium oxide in the coating layer is from 0.2 mg/m2 to 50 mg/m2 in terms of metal Zr amount, and
a peak position of binding energy of Sn3d5/2 according to X-ray photoelectron spectroscopy of the tin oxide in the coating layer is 1.6 eV or higher than a peak position of binding energy of the metal Sn.

### Claim 2 (depends on 1)

The Sn-based alloy plated steel sheet according to claim 1, wherein a thickness of the coating layer is from 2 nm to 100 nm.

### Claim 3 (depends on 1)

The Sn-based alloy plated steel sheet according to claim 1, wherein the coating layer further contains phosphorus and a P amount/a. metal Zr amount is from 0.2 to 1 in terms of mass ratio per unit area.

### Claim 4 (depends on 2)

The Sn-based alloy plated steel sheet according to claim 2, wherein the coating layer further contains phosphorus and a P amount/a metal Zr amount is from 0.2 to 1 in terms of mass ratio per unit area.