稀土镁镍合金的电极循环性能与电化学腐蚀行为研究  

Investigation of Electrode Cycling Performance and Electrochemical Corrosion Behaviour of RE-Mg-Ni Alloy

作　　者：董小平[1] 杨丽颖[1] 王青[1] 朱凯宁[1] 徐亚威[2] 王翠表[1] 

机构地区：[1]河北大学质量技术监督学院,河北保定071002 [2]河北冀衡(集团)药业有限公司,河北衡水053000

出　　处：《稀有金属与硬质合金》2012年第5期28-32,共5页Rare Metals and Cemented Carbides

基　　金：河北省自然科学基金项目(E2010000301);河北大学自然科学研究计划项目(2009-152;2009-153);河北大学大学生科技创新项目(2011073);保定市科学计划研究与发展指导计划项目(12ZG018)

摘　　要：制备了铸态及热处理La0.80Mg0.20(Ni0.94Co0.06)3.7合金,研究了热处理工艺对合金电极的循环性能、相成分和电化学腐蚀行为的影响。SEM和EDS分析表明,热处理后合金中各相间Mg和Ni元素的浓度差降低。与铸态合金相比,热处理合金中相邻相间的腐蚀混合电位较正,二者相邻相间的最大腐蚀电流密度分别为106.1mA/g和82.4mA/g。热处理后合金相间的电化学腐蚀得到改善,故其循环性能提高。Cast or heat treated La0.80Mg0.20（Ni0.94Co0.06）3.7 alloys were prepared to investigate effects of heat treatment on electrode cycling performance, phase composition and electrochemical corrosion behaviour of the alloys. The results from SEM and EDS analysis show that heat treatment will result in less Mg and Ni concentration difference between phases in the alloys. Compared with cast alloy, heat treated alloy has a more positive interphase corrosion mixed potential. The maximum interphase corrosion current density of cast alloy and heat treated alloy is 106.1 mA/g and 82.4 mA/g,respectively. After heat treatment, the al loy has better electrode cycling performance due to lower interphase electrochemical corrosion.

关 键 词：稀土镁镍合金 储氢合金电极 热处理 循环性能 相成分 电化学腐蚀 

分 类 号：TG139.7[一般工业技术—材料科学与工程]