METHOD FOR PRODUCING STAINLESS STEEL FOR FUEL CELL SEPARATORS STAINLESS STEEL FOR FUEL CELL SEPARATORS FUEL CELL SEPARATOR AND FUEL CELL

摘要

A method for producing stainless steel for a fuel cell separator excellent in electric conductivity and durability, a stainless steel for a fuel cell separator, a fuel cell separator, and a fuel cell. More specifically, stainless steel for a fuel cell separator is produced by subjecting a stainless steel containing 16 mass% or more of Cr to an electrolytic treatment, followed by immersion treatment with a solution containing fluorine. It is preferable that the electrolytic treatment is performed by a combination of an anode electrolysis or an anode electrolysis and a cathode electrolysis, and the anode electrolysis quantity Qa and the cathode electrolysis quantity Qc satisfy Qa Qc. Wherein the fluorine-containing solution is a fluoric acid or a nitric acid solution having a temperature of 40 ° C or higher, a hydrofluoric acid concentration [HF] (mass%) and a nitric acid concentration [HNO ₃ ] (mass%) satisfying [HF] ≥0.8 × [HNO ₃ ] It is preferable to be hydrofluoric acid.