Stainless steel foil for separators of polymer electrolyte fuel cells

Patent metadata

Field	Value
Publication number	US-9799896-B2
Application number	US-201415025744-A
Country	US
Kind code	B2
Filing date	Sep 2, 2014
Priority date	Oct 22, 2013
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

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 coating weight of the strike layer is 0.001 g/m 2 to 1 g/m 2 .

First claim

The invention claimed is:

1. A stainless steel foil for separators of polymer electrolyte fuel cells, 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 coating weight of the strike layer is 0.001 g/m 2 to 0.5 g/m 2 .

2. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 1 , wherein the Sn alloy layer includes at least one type of element selected from the group consisting of Ni and Fe.

3. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 2 , wherein the strike layer includes at least one type of element selected from the group consisting of Ni, Cu, Ag, and Au.

4. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 3 , 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.

5. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 3 , comprising a Sn-containing oxide layer on a surface of the Sn alloy layer.

6. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 4 , comprising a Sn-containing oxide layer on a surface of the Sn alloy layer.

7. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 2 , comprising a Sn-containing oxide layer on a surface of the Sn alloy layer.

8. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 1 , wherein the Sn alloy layer includes at least one type selected from the group consisting of Ni 3 Sn 2 , Ni 3 Sn 4 , FeSn and FeSn 2 .

9. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 8 , wherein the strike layer includes at least one type of element selected from the group consisting of Ni, Cu, Ag, and Au.

10. The stainless steel foil for separators of polymer electrolyte fuel cells 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 separators of polymer electrolyte fuel cells according to claim 9 , comprising a Sn-containing oxide layer on a surface of the Sn alloy layer.

12. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 10 , comprising a Sn-containing oxide layer on a surface of the Sn alloy layer.

13. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 8 , comprising a Sn-containing oxide layer on a surface of the Sn alloy layer.

14. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 1 , wherein the strike layer includes at least one type of element selected from the group consisting of Ni, Cu, Ag, and Au.

15. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 14 , 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.

16. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 15 , comprising a Sn-containing oxide layer on a surface of the Sn alloy layer.

17. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 14 , comprising a Sn-containing oxide layer on a surface of the Sn alloy layer.

18. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 14 , wherein the strike layer is made of an alloy layer comprising Ni and P, and has a P content in a range of 7% to 22% by mass.

19. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 1 , comprising a Sn-containing oxide layer on a surface of the Sn alloy layer.

20. The stainless steel foil for separators of polymer electrolyte fuel cells according to claim 19 , wherein the Sn-containing oxide layer has a film thickness in a range of 5 nm to 30 nm.

21. A stainless steel foil for separators of polymer electrolyte fuel cells, comprising:
a substrate made of stainless steel foil;
a Sn alloy layer with which a surface of the substrate is coated, with a strike layer in between; and
a Sn-containing oxide layer on a surface of the Sn alloy layer,
wherein a coating weight of the strike layer is 0.001 g/m 2 to 1 g/m 2 , and
the Sn-containing oxide layer has a film thickness in a range of 5 nm to 30 nm.

Assignees

• Jfe Steel Corp

Inventors

• Yano Takayoshi
• Ishikawa Shin

Classifications

• C25D11/34

  of metals or alloys not provided for in groups C25D11/04 - C25D11/32 · CPC title

• C25D5/36

  of iron or steel · CPC title

• C22C38/18

  containing chromium · CPC title

• C25D5/12

  at least one layer being of nickel or chromium · CPC title

• C25D3/12

  of nickel or cobalt · CPC title