不锈钢用作质子交换膜燃料电池双极板的化学改性方法  

Chemical Modification on Stainless Steel as Bipolar Plate of Polymer Electrolyte Membrane Fuel Cell

作　　者：潘欢欢[1] 徐洪峰[1] 孙昕[1] 张伟[1] 

机构地区：[1]大连交通大学环境与化学工程学院,大连116028

出　　处：《机械工程学报》2009年第2期51-55,共5页Journal of Mechanical Engineering

基　　金：国家高技术研究发展计划资助项目(863计划;2006AA11A134)

摘　　要：不锈钢以其优良的导电性及耐腐蚀性,作为双极板材料已被广泛应用于质子交换膜燃料电池。由于电池内部属于酸性环境,为了进一步提高不锈钢在质子交换膜燃料电池中的使用寿命,采用导电及酸性混合溶液对316L不锈钢(简称316LSS)进行化学表面改性,以达到同时提高其导电性及耐腐蚀性的作用。结果显示,处理后的316LSS与扩散层接触面电阻在压力为9×105Pa时,最小可达到18.5mΩ·cm2,比处理前接触面电阻降低近6倍,而腐蚀电流与未处理的316LSS相当,动电位极化曲线表明处理后SS的自腐蚀电位明显提高;通过超深度表面形态测试显微镜测试显示,处理后表面蚀孔有被覆盖的迹象。The stainless steel as bipolar plate has been widely used on polymer electrolyte membrane fuel cell（PEMFC） for its conductivity and anti-corrosion properties. Because of the acid environment in PEMFC, in order to further improve the service life, 316L stainless steel is put in the mixed conductive and acidic solution for surface chemical modification. The results indicate that, the contact resistance of 316L SS after passivation can reach 18.5 mΩ·cm^2 at least when the pressure achieves 9 × 10^5 Pa. Comparing with the 316L SS before passivation, its contact resistance decreases nearly 6 times while the corrosive current changes slightly. Dynamic potential polarization plot shows that, after passivation, the stainless steel improves its self-corrosion potential obviously. A lot of holes can be seen distributing on the surface of the steel under the apparatus of super depth microscope. But after passivation, most of the holes are mantled.

关 键 词：双极板 不锈钢 接触面电阻耐 腐蚀 

分 类 号：TM911.4[电气工程—电力电子与电力传动]