SURFACE TREATMENT TITANIUM MATERIAL FOR FUEL CELL SEPARATOR, AND METHOD FOR MANUFACTURING SAID MATERIAL

Provided are: a surface treatment titanium material for a fuel cell separator, said surface treatment titanium material having good toughness and excellent adhesion between a surface layer and a base material even when press molding is performed in harsh conditions, and it being possible to maintain electroconductivity for a long period of time; and a method for manufacturing said surface treatment titanium material. The surface treatment titanium material for a fuel cell separator is provided with a titanium base material having a passivation film on the surface, and a surface layer formed on the titanium base material, the surface layer including a titanium oxide layer and carbon particles, the carbon particles being dispersed inside the titanium oxide layer. The total film thickness of the titanium oxide layer and the passivation film is 25 nm or more, and when peak separation is performed on the Raman spectrum combining the surface layer and the passivation film, the ratio (Ti2O3/TiO2) of the peak height indicating the Ti2O3 and the peak height indicating the TiO2 is 0.08-1.45, inclusive, and the void ratio found on the boundary of the titanium oxide layer and the titanium base material is 0.30 or less.