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US 10,256,478 B2Granted
Stainless steel sheet for separator of polymer electrolyte fuel cell
AssigneeJfe Steel Corporation
InventorsTakayoshi Yano, Shin Ishikawa
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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 and 10,000 or fewer microcracks per cm2, where the microcrack is defined as a crack having a crack width that is at least 0.1 times the thickness of the Sn alloy layer and no more than 10 μm.
Claims16
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 and 10,000 or fewer microcracks per cm2 on a surface thereof to inhibit localized corrosion of the substrate, and
- each microcrack has a crack width of at least 0.1 times a thickness of the Sn alloy layer and no more than 10 μm, and a crack length of at least 1 μm and no more than 500 μm.
2 more elements
Dependencies are inferred from the claim text.