TITANIUM MATERIAL OR TITANIUM ALLOY MATERIAL HAVING SURFACE CONDUCTIVITY, PRODUCTION METHOD THEREFOR, FUEL CELL SEPARATOR USING SAME, AND FUEL CELL

摘要

In a titanium material or a titanium alloy material, in an oxide film formed on a surface of a titanium or a titanium alloy, the composition ratio of TiO (I TiO /(I Ti + I TiO )) × 100 found from the maximum intensity of the X-ray diffraction peaks of TiO (I TiO ) and the maximum intensity of the X-ray diffraction peaks of metal titanium (I Ti ) in X-ray diffraction measured at an incident angle to the surface of 0.3° is 0.5% or more. A titanium material or a titanium alloy material, and a fuel cell separator and a polymer electrolyte fuel cell having good contact-to-carbon electrical conductivity and good durability can be provided.