快淬速度对汽车用储氢合金电化学性能的影响  

Effect of Rapid Quenching Speed on Electrochemical Properties of Hydrogen Storage Alloy for Automobile

作　　者：郗玉平[1] 罗志欢 田可欣 XI Yuping;LUO Zhihuan;TIAN Kexin(Department of Transportation Engineering,Beijing Information Technology College,Beijing 100070,China;School of Materials Science and Engineering,Beijing University of Science and Technology,Beijing 100083,China)

机构地区：[1]北京信息职业技术学院交通工程系,北京100070 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《实验室研究与探索》2022年第2期8-12,83,共6页Research and Exploration In Laboratory

基　　金：国家自然科学基金项目(57131094)。

摘　　要：采用中频感应熔炼法制备了铸态和快淬态储氢合金,研究了不同快淬速度对储氢合金的物相组成、显微形貌和电化学性能的影响。结果表明,随着快淬速度从0增加至32 m/s,储氢合金中(La,Mg)Ni;和(La,Mg)_(2)Ni_(7)相丰度逐渐减小,LaNi_(5)相丰度逐渐增大,晶胞体积逐渐减小。当铸态和快淬态储氢合金的活化次数分别为5次和3次时。随着快淬速度从0增加至32 m/s,储氢合金电极100次充放电的容量保持率S_(100)逐渐增大,腐蚀电流密度逐渐减小,腐蚀电位逐渐增大。储氢合金电极的高倍率放电性能变化趋势与交换电流密度和氢扩散系数保持一致,即铸态和不同快淬速度快淬态储氢合金的高倍率放电性能由交换电流密度I_(0)和氢扩散系数D_(0)共同决定。The as-cast and as-quench hydrogen storage alloy with different quenching rates was prepared by medium frequency induction melting,the effects of quenching speed on the phase composition,microstructure and electrochemical properties of hydrogen storage alloy were studied.The results show that with the increase of quenching speed from 0 to 32 m/s,the phase abundances of(La,Mg)Ni;and(La,Mg)_(2)Ni_(7)in hydrogen storage alloy decrease,and the phase abundance of LaNi_(5)increases gradually,and the cell volume decreases gradually.The activation times of as-cast and fast quenched hydrogen storage alloys are 5 and 3 times,respectively.With the increase of quenching speed from 0 to 32 m/s,S_(100)of hydrogen storage alloy electrode increases,corrosion current density decreases and corrosion potential increases.The trend of high power discharge performance of hydrogen storage alloy electrode is consistent with the exchange current density and hydrogen diffusion coefficient,that is,the high power discharge performance of as cast and as quenched hydrogen storage alloy is determined by I_(0)and D_(0).

关 键 词：储氢合金 快淬速度 物相组成 显微组织 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TM912[金属学及工艺—合金]