Material fuel cell separator, fuel cell separator using same, fuel cell stack, and method of producing fuel cell separator material
AssigneeJX Nippon Mining & Metals Corporation
InventorYoshitaka Shibuya
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Abstract
A material for fuel cell separator, wherein a surface layer 6 containing Au and Cr is formed on a surface of a Ti base 2, and an intermediate layer 2a containing Ti, O, Cr, and less than 20 atomic % of Au is present between the Ti base and the surface layer, a thickness of an area containing 65 atomic % or more of Au being 1.5 nm or more, a maximum concentration of Au being 80 atomic % or more, a coating amount of Au being 9000 to 40000 ng/cm2, a ratio represented by (Au coating amount)/(Cr coating amount) being 10 or more, a coating amount of Cr being 200 ng/cm2 or more, and in the intermediate layer having an area containing 10% or more of Ti, 10% or more of O and 20% or more of Cr being 1 nm or more.
Claims11
A material for a fuel cell separator, comprising:
- (a) a Ti base;
- (b) a surface layer containing Au and Cr formed on a surface of the Ti base;
- and
- (c) an intermediate layer containing Ti, O, Cr, and less than 20 atomic % of Au, wherein the intermediate layer is present between the Ti base and the surface layer;
- wherein an area of the surface layer containing 65 atomic % or more of Au has a thickness of 1.5 nm to 27 nm,
- a maximum concentration of Au in the surface layer is 85 to 99 weight %,
- a coating amount of Au is 9000 to 40000 ng/cm2,
- a ratio represented by (Au coating amount)/(Cr coating amount) is 10 to 80.4,
- a coating amount of Cr is 200 ng/cm2 to 5040 ng/cm2, and
- the intermediate layer has an area of 1 nm to 5 nm containing 10 atomic % or more of Ti, 10 atomic % or more of 0 and 20 atomic % or more of Cr.
Dependencies are inferred from the claim text.