Separator material for fuel cell, separator for fuel cell using the same, and fuel cell stack



<P>PROBLEM TO BE SOLVED: To provide a separator material for a fuel cell capable of strongly and uniformly forming an Au layer or a layer including Au in the surface of a titanium base material and capable of securing adhesiveness and corrosion resistance to be required for a separator for a fuel cell. <P>SOLUTION: In the separator material for the fuel cell, an alloy layer 6 made of Cr and Au or an Au single layer 8 is formed in the surface of the Ti base material 2, and an intermediate layer 2a including Ti, O and Cr and including Au of less than 20 mass% exists between the alloy layer or the Au single layer and the Ti base material. As going to lower layers from a depth of 1 nm from the outermost surface, the maximum content of C to a depth, at which Ti of 50 mass% is included, is 10 mass% or less. <P>COPYRIGHT: (C)2011,JPO&INPIT
【課題】チタン基材表面にAu層又はAuを含む層を強固かつ均一に形成可能で、燃料電池用セパレータに要求される密着性及び耐食性を確保できる燃料電池用セパレータ材料を提供する。 【解決手段】Ti基材2の表面に、CrとAuとの合金層6、又はAu単独層8が形成され、合金層又はAu単独層とTi基材との間に、Ti、O及びCrを含み、Au20質量%未満の中間層2aが存在し、最表面から1nmの深さから下層に向かい、Tiが50質量%となる深さまでのCの最大含有量が10質量%以下である燃料電池用セパレータ材料である。 【選択図】図2




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