Abstract: As compared with stainless steel 304 (SS304), polarization curves and electrochemical impedance spectroscopy (EIS) of high nitrogen stainless steel (HNSS) were measured under simulated PEM fuel cell environment. The experimental results show that the natural corrosion current density and the passivation current density of HNSS is 21.7% and 24.5% lower than SS304 respectively, and this illustrates HNSS has better corrosion resistance than SS304；the value of the charge transmission resistance of HNSS is 2.43×103 times larger than SS304, and the dispersion index of HNSS (N=0.899 4) is closer to 1 than SS304 (N=0.844 5), and this indicates that the passive film of HNSS is thicker and smoother than SS304.

Key words: High nitrogen stainless steel, Fuel cell, Polarization curves, Electrochemical impedance spectroscopy

摘要： 以高氮不锈钢为研究对象，304不锈钢作对比，在模拟PEM燃料电池环境中测试二者的极化曲线和交流阻抗，运用相关软件分析曲线和数据。实验结果表明：高氮不锈钢的自腐蚀电流密度和维钝电流密度分别比304不锈钢低21.7%和24.5%，说明高氮不锈钢比304不锈钢有更好的耐腐蚀性；高氮不锈钢的电荷转移电阻比304不锈钢高2.43×103倍，而且高氮不锈钢的弥散指数(N= 0.899 4)比304不锈钢的弥散指数(N = 0.844 5)更接近1，这表明高氮不锈钢的钝化膜比304不锈钢的厚而且光滑。

关键词: 高氮不锈钢, 燃料电池, 极化曲线, 交流阻抗