| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a metal separator for a fuel cell having sufficient corrosion resistance although a noble metal film is thin, and easy to manufacture. <P>SOLUTION: In this separator for a fuel cell, a metal material plate material constituting it has a plate-like base material of a metal material where a passive film is formed on a surface thereof in the atmosphere, and a noble metal coating layer covering the surface of the base material and containing a diffused metal constituent from the base material. When noble metal concentration is analyzed in the depth direction from the surface layer side of the noble metal coating layer by an Auger electron spectral analysis method, a main part of the noble metal coating layer where the noble metal concentration C<SB>N</SB>is set constant in the range of 85-99.8 mass% in the depth direction is discerned from a noble metal concentration transition part thereof where the noble metal concentration C<SB>N</SB>is gradually reduced from the noble metal concentration C<SB>A</SB>of the main part toward bulk noble metal concentration C<SB>B</SB>of the base material as shown on the right of the figure. In the main part, the content of the diffused metal constituent C<SB>F</SB>is 0.2-15 mass%, and the thickness t1 is not smaller than 1 nm and not larger than 100 nm, and larger than the thickness t2 of the noble metal concentration transition part. <P>COPYRIGHT: (C)2008,JPO&INPIT |
