Preparation of Mg-Yb alloy film by electrolysis in the molten LiCl-KCl-YbCl3 system at low temperature

被引:0
作者
陈野 [1 ]
叶克 [1 ]
张密林 [1 ]
机构
[1] Key Laboratory of Superlight Materials & Surface Technology,Ministry of Education,College of Materials Science and Chemical Engineering,Harbin Engineering University
基金
中国国家自然科学基金;
关键词
LiCl-KCl eutectic; molten salt; Mg-Yb alloy films; electrolysis; low temperature; rare earths;
D O I
暂无
中图分类号
TG174.44 [金属复层保护];
学科分类号
080503 ;
摘要
The electrochemical behavior of Yb3+ and electrodeposition of Mg-Yb alloy film at solid magnesium cathode in the molten LiCl-KCl-YbCl3(2 wt.%) system at 773 K was investigated.Transient electrochemical techniques,such as cyclic voltammetry,chronopotentiometry and chronoamperometry were used in order to explore the deposition mechanism of Yb.The reduction process of Yb3+ is stepwise reactions which are single-electron and double-electron reversible charge transfer reactions.The speed control step was a diffusion-controlled step which is caused by concentration polarization.The microstructures of Mg-Yb alloy film were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM) and EPMA area analysis.A very thin Mg2Yb alloy film(~200 nm) was formed by potentiostatic electrolysis at ?1.85 V(vs.Ag/AgCl) for 12 h.A much thicker Mg2Yb alloy film(~450 μm) was obtained at ?2.50 V(vs.Ag/AgCl) for 2.5 h.The corrosion resistance of magnesium can be enhanced by electrochemical formation of Mg-Yb alloy film on its surface.
引用
收藏
页码:128 / 133
页数:6
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