Titanium or titanium alloy material for fuel cell separator with improved conductivity and durability against carbon contact, fuel cell separator using the same, and production method thereof

摘要

Provided is a titanium or titanium alloy material for a polymer electrolyte fuel cell separator having excellent contact resistance to carbon and durability. It has an oxide film formed by stabilization treatment after passivation treatment on a titanium or titanium alloy substrate, and carbide, nitride of tantalum, titanium, vanadium, zirconium or chromium is contained in this oxide film 1 or 2 or more of carbonitride, boride, titanium, or titanium alloy material in which the conductive material is dispersed with a major axis diameter of 1 nm or more and 100 nm or less, adjusted to pH 4 The contact resistance value with carbon paper before and after the accelerated deterioration test immersed in a sulfuric acid aqueous solution at 4 ° C. for 4 days is 20 mΩ · cm 2 or less at a surface pressure of 10 kgf / cm 2.