Arc ion plated Cr/CrN/Cr multilayers on 316L stainless steel as bipolar plates for polymer electroly
Arc ion plated Cr/CrN/Cr multilayers on 316L stainless steel as bipolar plates for polymer electroly
复制标题
DOI：
10.1016/j.jpowsour.2010.11.154
复制
发表时间：
2011-03
期刊：
影响因子：
--
通讯作者：
Min Zhang;Bo Wu;Guoqiang Lin;Z. Shao;M. Hou;B. Yi
中科院分区：
文献类型：
--
作者：
Min Zhang;Bo Wu;Guoqiang Lin;Z. Shao;M. Hou;B. Yi
采用电弧离子镀(AIP)技术在不锈钢316L(SS316L)上镀制了夹心状的铬/氮化铬/铬多层膜作为聚合物电解质膜燃料电池(PEMFC)的双极板。研究了模拟质子交换膜燃料电池的相结构、硬度、附着力、双极板与碳纸的界面接触电阻(ICR)和电化学腐蚀性能。在多层膜中观察到晶面为(110)、(211)、(322)的Cr相和具有(321)晶面的CrN相。扫描电子显微镜观察表明，涂层表面光滑、连续、致密，EDX结果也证实了涂层的夹层结构。划痕试验表明，多层膜与钢基材具有较强的结合强度，有利于防止层的机械剥落。经过涂层处理后，双极板的性能有了很大的提高。双极板的诺氏硬度从324HK提高到692HK。ICR降低了一个数量级；此外，耐蚀性也得到了提高。我们的分析表明，这种改善归因于光滑致密的涂层的高附着力和铬/铬/氮化铬多层结构的协同作用。
Arc ion plating (AIP) is applied to coat sandwich-like Cr/CrN/Cr multilayers on stainless steel 316L (SS316L) as bipolar plates for polymer electrolyte membrane fuel cell (PEMFC). Phase structure, hardness, adhesion property, interfacial contact resistance (ICR) between bipolar plates and carbon papers, and electrochemical corrosion property in the simulated PEMFC conditions are investigated. Cr phase with crystal plane of (110), (211), (322), and CrN phase with (321) are observed in the multilayer. The coating is found smooth, continuous and dense in cross-sectional observation by SEM, and the sandwiched structure of the coating is also confirmed by EDX results. Scratch tests show that the multilayer exhibits strong adhesion strength with steel substrate, which is beneficial to prevent layers from peeling off mechanically. After the coating treatment, the performance of the bipolar plate is greatly improved. Knoop hardness of the bipolar plates increases from 324HK to 692HK. The ICR decreases by one order of magnitude; furthermore, the corrosion resistance was also enhanced. Our analysis indicates that the improvement is attributed to high adhesion force of the smooth and dense coating and the synergistic function of Cr/CrN/Cr multilayer structure.