| abstract |
When manufactured in a fuel cell separator, it has the effect that it can be used while maintaining a low contact resistance for a long period of time, and even if the production lots are different, for example, the effect varies. A difficult titanium substrate and a fuel cell separator using the same are provided. A substrate for a fuel cell separator according to the present invention has one surface selected from Nb, Ta, Zr, Ti, and Hf as one or more kinds of noble metal elements selected from Au and Pt. After the noble metal alloy layer 3 made of an alloy containing 5 to 65 atomic% of the above non-noble metal element is formed, it is made of titanium or a titanium alloy that is heat-treated at 300 to 800 ° C. to form the fuel cell separator 1. The titanium substrate 2 is characterized in that, in the surface layer, the concentration of carbon having binding energy in the range of 280 to 284 eV measured by X-ray photoelectron spectroscopy is 30 atomic% or less. [Selection] Figure 1 |