Separator for fuel cell and method for producing the same

Abstract

A separator for a fuel cell includes a gold covering layer formed on the surface of stainless steel plate. A method for producing a separator, prevents exfoliation and fracture of the gold covering layer but obtains corrosion resistance and durability. Voids are formed by intergranular corrosion treatment at a surface of the stainless steel plate, and the gold covering layer is formed so as to be embedded in the voids. Limit value of radius of curvature in bends in which exfoliations or fractures in the gold covering layer is formed can be reduced by satisfying the equation 0.2≦4/d/L≦80 wherein L(μm) is the average grain size of the surface of stainless steel plate, and d(μm) is the thickness of the gold covering layer.

Dependencies are inferred from the claim text.