金属双极板TiCr膜层氯离子腐蚀的研究与模拟  

Study and simulation on chloride ion corrosion of TiCr coated metallic bipolar plates

作　　者：石锟 冯磊 姚力[3] 李微微[1] 王树博[1] 谢晓峰[1,4] SHI Kun;FENG Lei;YAO Li;LI Wei-wei;WANG Shu-bo;XIE Xiao-feng(Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China;Beijing Spacecrafts,China Academy of Space Technology,Beijing 100094,China;Advanced Technology Department,SAIC Motor Corporation Limited,Shanghai 201804,China;Shanxi Research Institute for Clean Energy,Tsinghua University,Taiyuan 030032,China)

机构地区：[1]清华大学核能与新能源技术研究院,北京100084 [2]中国空间技术研究院北京卫星制造厂有限公司,北京100094 [3]上海汽车集团股份有限公司前瞻技术研究部,上海201804 [4]清华大学山西清洁能源研究院,山西太原030032

出　　处：《高校化学工程学报》2019年第4期843-848,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家重点研发计划项目(2016YFE0102700);山西省科技重大专项项目(20181101006)

摘　　要：为了研究金属双极板TiCr膜层的氯离子腐蚀规律和机理,采用磁控溅射方法制备以316L不锈钢为基体,TiCr为导电膜层的双极板材料。针对燃料电池和固体聚合物电解水电解池的内部溶液容易被氯离子污染的实际情况,借助电化学极化曲线和交流阻抗谱(EIS),考察了电解质溶液中氯离子浓度对TiCr膜层耐蚀性的影响。并且,通过分子模拟软件对氯离子影响合金膜腐蚀速率的机理进行了动力学模拟。测试和分子模拟结果表明,合金膜的腐蚀速率随氯离子含量的增加而增加,氯离子通过与合金钝化膜表面处金属原子之间的吸附-溶解过程,实现对膜层的加速腐蚀。In order to study the chloride ion corrosion behavior and mechanism of TiCr coated metallic bipolar plates, conductive TiCr coatings were deposited on 316 L stainless steels by magnetron sputtering. As the inner solutions of fuel cells and solid polymer electrolyte electrolyzers are likely to be contaminated by chloride ions,the effect of the chloride ion concentration on the corrosion resistance of bipolar plate was investigated through potentiodynamic polarization and electrochemical impedance spectroscopy(EIS) tests. Molecular simulation was applied to explain corrosion mechanism. The experiments and molecular dynamic simulation indicate that the anticorrosion property of TiCr coating degrades with the increase of chloride ion concentration in solution.Chloride ions accelerate corrosion by adsorbing and dissolving surface metal atoms in passive films.

关 键 词：金属双极板 腐蚀机理 分子模拟 氯离子 

分 类 号：TQ465.92[化学工程—制药化工]