STAINLESS STEEL SEPARATOR FOR POLYMER ELECTROLYTE FUEL CELL AND POLYMER ELECTROLYTE FUEL CELL

摘要

PROBLEM TO BE SOLVED: To provide a stainless steel separator for a polymer electrolyte fuel cell keeping high corrosion resistance and at the same time lowering the surface contact resistance by forming a thin passive film having high concentration of Cr on the surface of austenitic stainless steel.

SOLUTION: Austenitic stainless steel containing 10-19 mass% Cr and less than 1 mass% Mo is used as a base material, and the whole surface of the base material is immersed in a nonoxidative acid solution to form a passive film which has a contact resistance to carbon paper of 10 mΩ cm2or less at a measuring pressure of 20 kgf/cm2.

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