Titanium material for polymer electrolyte fuel cell separator and method for producing the same, separator using the titanium material, and polymer electrolyte fuel cell using the separator

摘要

PPROBLEM TO BE SOLVED: To provide a titanium material with a low ion elution property, and hardly depositing titanium oxide, that is, having low contact resistance even after power generation, most suited as a raw material for a separator of a solid polymer fuel cell, to provide its manufacturing method, as well as a separator and a fuel cell using the same. PSOLUTION: A titanium material for a solid polymer fuel cell separator with a thickness of its surface oxide within the range of 5 to 25 nm, an average carbon density within a depth range of 10 nm from the outermost surface including an oxide layer of the titanium material of 0.02 to 6 at%, an average nitrogen density of 0.02 to 6 at%, and a fluorine density in the oxide of 7 at%, its manufacturing method, as well as a separator using the titanium material, and a solid polymer fuel cell using the separator are provided. PCOPYRIGHT: (C)2008,JPO&INPIT