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Abstract:Titanium and its alloys with low density,high specific strength and excellent corrosion resistance in acidic conditions,which makes titanium and its alloys have great application value in bipolar plates of hydrogen fuel cell and attract extensive attention from scholars. In this paper,the research progress of titanium and its alloys in hydrogen fuel cell bipolar plates is reviewed. Furthermore,the research results of surface modification technology in titanium bipolar plate are studied in detail,including doping element alloying of titanium,metal-based coating( precious metals,metallic carbon/nitrides,etc.) and carbon-based coatings( graphite,amorphous carbon,etc.). Composite and nanostructure of coating structure are beneficial to improve the corrosion resistance,electrical conductivity and hydrophobicity of the titanium bipolar plate,which have a significant effect on the performance,operational stability and durability of the hydrogen fuel cell.
keywords: hydrogen fuel cell titanium alloy bipolar plate surface modification electrical conductivity
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