| 简介 |
This titanium material for solid polymer fuel cell separators contains, in mass%, 0.005-0.15% of a platinum group element and 0.002-0.10% of a rare earth element, with the balance made up of Ti and impurities. Consequently, the surface of this titanium material for solid polymer fuel cell separators can be provided with a coating film having good conductivity, while reducing the time necessary for acid pickling. The surface of this titanium material is provided with a coating film that is formed of titanium oxide and a platinum group element, and it is preferable that the coating film has a thickness of 50 nm or less and the concentration of the platinum group element in the surface of the coating film is 1.5% by mass or more. By having the above-described coating film, this titanium material can be reduced in the initial contact resistance, while ensuring good corrosion resistance. It is preferable for this titanium material that the rare earth element is Y and the platinum group element is Pd. |
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