Clark & Brody
Titanium material for polymer electrolyte fuel cell separator, method for producing the same, and polymer electrolyte fuel cell using the same
A titanium material for a polymer electrolyte fuel cell separator consists of, by mass %, a platinum group metal: 0.005% to 0.15% and a rare earth metal: 0.002% to 0.10%, with the balance being Ti and impurities. The titanium material of the present invention is provided with a film formed of a titanium oxide and a platinum group metal on the surface thereof. It is preferred that the film has a thickness of 50 nm or less, and that the concentration of the platinum group metal on the surface of the film is 1.5% by mass or more. With the thus formed film, the titanium material of the present invention is capable of achieving a reduction in initial contact resistance and ensuring good corrosion resistance. In the titanium material of the present invention, the rare earth metal is preferably Y, and the platinum group metal is preferably Pd.
NIPPON STEEL & SUMITOMO METAL CORPORATION
C C C H H B H Y Y C H C
C22F C23G C22F H01M H01M B22F H01M Y02P Y02E C22F H01M C22C
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Hideya Kouichi Satoshi Kentarou
Kaminaka Takeuchi Matsumoto Yoshida