Acta Metallurgica Sinica (English Letters) ›› 2010, Vol. 23 ›› Issue (2): 129-136.DOI: 10.11890/1006-7191-102-129

• 研究论文 • 上一篇    下一篇

熔盐电解制备Mg-Li-Al合金

韩伟;陈琼;叶克;颜永得;张密林   

  1. 哈尔滨工程大学 超轻材料与表面技术教育部重点实验室
  • 收稿日期:2009-09-15 修回日期:2009-11-27 出版日期:2010-04-25 发布日期:2010-04-08
  • 通讯作者: 韩伟

New preparation of Mg-Li-Al alloys by electrolysis in molten salt

Wei HAN, Qiong CHEN, Ke YE, Yongde YAN, Milin ZHANG   

  1. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Material Science and chemical Engineering, Harbin Engineering University, Harbin 150001, China
  • Received:2009-09-15 Revised:2009-11-27 Online:2010-04-25 Published:2010-04-08
  • Contact: Milin ZHANG

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摘要：

为探索Mg-Li-Al合金新的制备方法，本课题以KCl-LiCl-AlCl3-MgCl2-KF为电解质体系，惰性电极（钼电极）为阴极，通过熔盐电解制备Mg-Li-Al合金。为找到制备合金的较佳的工艺条件，本文讨论了影响电流效率的一些主要因素，也讨论了合金共电沉积的基本条件。通过实验验证，当电流密度大于9.0A/cm2条件下，Mg2+、Li+、Al3+同时在阴极放电，共电沉积析出Mg-Li-Al合金，并且放电时槽电压保持在6～9V之间。通过研究各工艺参数对实验的影响，根据实验拟定了较佳的电解工艺条件。当电流密度为12~13A/cm2，电解温度为620~640℃。通过60分钟的电解，经计算电流效率可达86%。合金中，镁与锂结合以Li0.92Mg4.08和Li3Mg7的形式存在，而铝则以Mg0.58Al0.42的形式存在，并且均匀分布在α相和β相中。

关键词: Mg-Li-Al合金, 熔盐, 电解, 共电沉积

Abstract:

This work presents a study on electrochemical formation of Mg-Li-Al alloys on an inert electrode (Mo electrode) in a molten KCl-LiCl-AlCl3-MgCl2-KF system. It aims at preparation Mg-Li-Al metal alloy directly under an optimal electrolytic parameters. Main factors which affect current efficiency are investigated. We have discussed the co-electrodeposition conditions and the effect of technical parameters on these experiments, and gained a good electrolytic process. The result of calculation shows that co-electrodeposition Mg, Li and Al occurs at the cathode current density higher than 9 A/cm2 and electrolytic voltage between 6 to 9 V. And at the optimal parameters, 12-13 A/cm2, 620-640 ℃, the highest current efficiency reaches as high as 86 %. Lithium combined with magnesium forms Li0.92Mg4.08 and Li3Mg7, and aluminum mainly exists in a form of Mg0.58Al0.42, distributing in the alpha phases and beta phases.

Key words: Mg-Li-Al, Molten salts, Co-electrodeposition, Electrolysis