低温青藏高原土壤中镁合金阳极的电化学性能  

Electrochemical performance of magnesium anodes in Qinghai-Tibetan plateau soil at low temperature

作　　者：梁成浩[1,2] 袁传军[1,3] 勇艳华[1] 

机构地区：[1]大连理工大学化工学院,辽宁大连116012 [2]大连海事大学机电与材料工程学院,辽宁大连116026 [3]大连民族学院,辽宁大连116100

出　　处：《材料科学与工艺》2008年第2期163-166,共4页Materials Science and Technology

基　　金：辽宁省自然科学基金资助项目(972210)

摘　　要：为评价低温土壤对镁合金阳极电化学性能的影响,通过极化曲线、交流阻抗和电流效率实验方法,研究了4种镁合金阳极在-4℃和4℃的模拟低温青藏高原土壤中的电化学性能.研究表明:镁合金中加入Mn、Al和Zn元素可与杂质元素形成阴极作用较弱的金属间化合物,降低了镁合金的自溶解倾向,提高了电流效率;镁合金阳极在低温青藏高原土壤中呈活性溶解状态,溶解活性和反应活性由强到弱顺序为MGAZ63B镁合金、MGAZ31B镁合金、MGM1C镁合金和高纯镁;4种镁合金阳极中MGAZ63B的电流效率最高,-4℃和4℃时分别为54.39%和61.77%;4℃土壤中氧的扩散速率比-4℃时高,故镁合金阳极在青藏高原土壤中4℃时溶解活性和电流效率均优于-4℃时.In order to investigate the effect of low temperature soil performance of four magnesium alloy anodes in simulated Qinghai on magnesium anode, the electrochemical -Tibetan plateau soil at low temperatureof -4℃ and 4℃ was studied by polarization curves, electrochemical impedance and current efficiency tests. The results showed that addition of Mn, Al and Zn elements could decrease the natural dissolution tendency of magnesium alloy, and increase the current efficiency through the formation of an intermetallic compound with weak cathodic effect between Mn, Al, Zn and impurity elements. Magnesium alloy anodes presented active dissolution state in low temperature Qinghai-Tibetan plateau soil. The sequence of dissolution activation and reaction activation from high to low was MGAZ63B, MGAZ31B, MGMIC and pure magnesium. Among these four anodes, current efficiency of MGAZ63B was the highest, -4℃ and 4℃ respectively. For diffusion rate of oxygen at 4 dissolution activation and current efficiency of magnesium alloy were superior to that of at -4℃. and the values were 54.39% and 61.77% at 4℃ soil was higher than that of at -4℃, the anodes in Qinghai-Tibetan plateau soil at 4℃ were superior to that of at -4℃.

关 键 词：镁合金阳极 低温土壤 青藏冻土 极化曲线 交流阻抗 

分 类 号：TG172.4[金属学及工艺—金属表面处理]