Stainless-steel foil for separator of polymer electrolyte fuel cell

Patent metadata

Field	Value
Publication number	US-10431832-B2
Application number	US-201515302825-A
Country	US
Kind code	B2
Filing date	Jan 29, 2015
Priority date	Apr 15, 2014
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

The surface of a substrate made of stainless-steel foil is coated with a Sn alloy layer, with a strike layer in between. The coverage of the strike layer on the substrate is 2% to 70%.

First claim

The invention claimed is:

1. A stainless-steel foil for a separator of a polymer electrolyte fuel cell, comprising:
a substrate made of stainless-steel foil; and
a Sn alloy layer with which a surface of the substrate is coated, with a strike layer in between,
wherein a coverage of the strike layer on the substrate is in a range of 2% to 70%, and
the strike layer is distributed in a form of islands, and a maximum diameter of each of the islands as coating portions is 1 μm or less.

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

3. The stainless-steel foil for a separator of a polymer electrolyte fuel cell according to claim 2 , wherein the strike layer contains at least one element selected from the group consisting of Ni, Cu, Ag, and Au.

4. The stainless-steel foil 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.

5. The stainless-steel foil for a separator of a polymer electrolyte fuel cell according to claim 1 , wherein the Sn alloy layer contains Ni 3 Sn 2 .

6. The stainless-steel foil for a separator of a polymer electrolyte fuel cell according to claim 5 , wherein the strike layer is made of an alloy layer of Ni and P, and has a P content in a range of 5% to 22% by mass.

7. The stainless-steel foil 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.

8. The stainless-steel foil for a separator of a polymer electrolyte fuel cell according to claim 7 , wherein the Sn-containing oxide layer has a thickness in a range of 5 nm to 30 nm.

9. The stainless-steel foil for a separator of a polymer electrolyte fuel cell according to claim 1 , wherein the strike layer contains at least one element selected from the group consisting of Ni, Cu, Ag, and Au.

10. The stainless-steel foil for a separator of a polymer electrolyte fuel cell according to claim 9 , wherein the strike layer is made of an alloy layer of Ni and P, and has a P content in a range of 5% to 22% by mass.

11. The stainless-steel foil 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.

12. The stainless-steel foil for a separator of a polymer electrolyte fuel cell according to claim 11 , wherein the Sn-containing oxide layer has a thickness in a range of 5 nm to 30 nm.

Assignees

• Jfe Steel Corp

Inventors

• Yano Takayoshi
• Ishikawa Shin

Classifications

• H01M8/1004

  characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence) · CPC title

• C25D3/40

  from cyanide baths {, e.g. with Cu+} · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• H01M2250/20

  Fuel cells in motive systems, e.g. vehicle, ship, plane · CPC title

• C23C28/02

  only coatings {only including layers} of metallic material · CPC title