为了探索离子注入Nb不锈钢双极板在模拟质子交换膜燃料电池（ PEMFC）中的性能，采用极化曲线、恒电位试验和电化学阻抗谱等方法研究了离子注入铌316不锈钢在PEMFC环境中耐孔蚀性能的影响。研究表明：模拟PEMFC环境中316不锈钢和离子注入铌316不锈钢试样均发生孔蚀；Nb离子的注入提高了抗孔蚀性能，且随着介质温度的升高，孔蚀倾向加剧。孔蚀的诱发是离子注入铌316不锈钢表面水解形成Nb（ OH）＋4，导致钝化膜局部溶解破坏所致。模拟PEMFC环境中316不锈钢表面注入铌层膜电阻Rcoat、电荷转移电阻Rct升高，而注入铌层的电容值Ccoat、双电层电容Cct下降，表明注入铌层成为高电阻、低电容的阻挡层，对基体起到良好的保护作用。
To investigate the characteristics of stainless steel implanted Nb in simulated proton exchange membrane fuel cell ( PEMFC) environment, its pitting corrosion resistance was studied by polarization curves, chronoamperometry and electrochemical impedance spectroscopy method. The results indicated that the pitting corrosion appeared on the surface of 316 stainless steel in simulated PEMFC environment whether it was implanted Nb or not. The steel′s pitting corrosion resistance was improved and the pitting corrosion tendency was increased with the increasing of simulated solution temperature after implanted Nb. The pitting corrosion was induced by the partial breakdown of the passive film, which was caused by the hydrolysis formation of Nb( OH)+4 on the 316 stainless steel implanted Nb. At the same time, its film resistance and charge transfer resistance were also improved while its film capacitance and double layer capacitance were decreased in simulated PEMFC environment. The results indicated that the implanted Nb film had been the barrier layer of high resistance and low capacitance, which prevented the matrix steel from corrosion.
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