# US 2018/0026276 A1 · Stainless steel sheet for separator of polymer electrolyte fuel cell

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- Number: US 2018/0026276 A1
- Document ID: US20180026276A1
- Status: Published application
- Kind: A1
- Application number: 15/546,383
- Filed: 2015-12-18
- Published: 2018-01-25
- Earliest claimed: 2015-01-29
- Assignees: Jfe Steel Corporation
- Applicants: Jfe Steel Corporation
- Inventors: Takayoshi YANO; Shin ISHIKAWA
- Web page: https://patentgrep.com/patent/US20180026276A1

## CPC

- H01M 8/0245: in the form of layered or coated products
- C25D 3/60: containing more than 50% by weight of tin
- C25D 5/48: After-treatment of electroplated surfaces
- C25D 7/00: Electroplating characterised by the article coated
- H01M 8/0202: Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M 8/0208: Alloys
- H01M 8/0232: Metals or alloys
- H01M 8/10: Fuel cells with solid electrolytes
- H01M 2008/1095: {Fuel cells with polymeric electrolytes}
- Y02E 60/50: Fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A stainless steel sheet for a separator of a polymer electrolyte fuel cell includes a substrate made of stainless steel and a Sn alloy layer with which a surface of the substrate is coated. The Sn alloy layer includes 10 or more microcracks per cm2.

## Claims

### Claim 1

A stainless steel sheet for a separator of a polymer electrolyte fuel cell, comprising:
a substrate made of stainless steel; and
a Sn alloy layer with which a surface of the substrate is coated, wherein
the Sn alloy layer includes 10 or more microcracks per cm2.

### Claim 2 (depends on 1)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 1, wherein
the Sn alloy layer contains at least one element selected from Ni and Fe.

### Claim 3 (depends on 1)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 1, wherein
the Sn alloy layer contains Ni3Sn2.

### Claim 4 (depends on 1)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 1, further comprising
a strike layer between the Sn alloy layer and the substrate made of stainless steel.

### Claim 5 (depends on 1)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 1, further comprising
a Sn-containing oxide layer on a surface of the Sn alloy layer.

### Claim 6 (depends on 2)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 2, wherein
the Sn alloy layer contains Ni3Sn2.

### Claim 7 (depends on 2)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 2, further comprising
a strike layer between the Sn alloy layer and the substrate made of stainless steel.

### Claim 8 (depends on 3)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 3, further comprising
a strike layer between the Sn alloy layer and the substrate made of stainless steel.

### Claim 9 (depends on 6)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 6, further comprising
a strike layer between the Sn alloy layer and the substrate made of stainless steel.

### Claim 10 (depends on 2)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 2, further comprising
a Sn-containing oxide layer on a surface of the Sn alloy layer.

### Claim 11 (depends on 3)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 3, further comprising
a Sn-containing oxide layer on a surface of the Sn alloy layer.

### Claim 12 (depends on 4)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 4, further comprising
a Sn-containing oxide layer on a surface of the Sn alloy layer.

### Claim 13 (depends on 6)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 6, further comprising
a Sn-containing oxide layer on a surface of the Sn alloy layer.

### Claim 14 (depends on 7)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 7, further comprising
a Sn-containing oxide layer on a surface of the Sn alloy layer.

### Claim 15 (depends on 8)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 8, further comprising
a Sn-containing oxide layer on a surface of the Sn alloy layer.

### Claim 16 (depends on 9)

The stainless steel sheet for a separator of a polymer electrolyte fuel cell according to claim 9, further comprising
a Sn-containing oxide layer on a surface of the Sn alloy layer.