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用直流磁控溅射技术在304不锈钢基体上制备导电非晶碳膜,重点研究了基体偏压对非晶碳膜微结构、导电性和耐蚀性的影响。结果表明:与纯不锈钢双极板相比,经非晶碳膜表面改性的不锈钢表面的导电性和耐蚀性均大幅度提高。当基体偏压为-200V时在质子交换膜燃料电池组装典型压力(1.5MPa)下非晶碳膜的sp2含量最高,使改性不锈钢双极板具有最低的接触电阻(16.65mΩ·cm2);在模拟质子交换膜燃料电池工作环境的腐蚀溶液中镀膜后不锈钢板的腐蚀电位显著提高,腐蚀电流明显下降。尤其在偏压-200V下薄膜具有最佳的致密性,腐蚀电位为0.25V,腐蚀电流密度为1.22×10-8A/cm2,耐蚀性能最佳。
Conductive amorphous carbon films were prepared on a 304 stainless steel substrate by DC magnetron sputtering. The effects of substrate bias on the microstructure, electrical conductivity and corrosion resistance of the amorphous carbon films were mainly studied. The results show that compared with the pure stainless steel bipolar plate, the surface of the amorphous carbon film surface modification of the electrical conductivity and corrosion resistance are greatly improved. When the substrate bias is -200V, the sp2 content of the amorphous carbon film is the highest under the typical pressure of the proton exchange membrane fuel cell assembly (1.5MPa), so that the modified stainless steel bipolar plate has the lowest contact resistance (16.65mΩ · cm2) The corrosion potential of the stainless steel plate is significantly increased after the coating in the etching solution simulating the working environment of the proton exchange membrane fuel cell, and the corrosion current obviously drops. In particular, the film has the best densification at a bias voltage of -200 V, a corrosion potential of 0.25 V and a corrosion current density of 1.22 × 10 -8 A / cm 2, resulting in the best corrosion resistance.