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过程工程学报 ›› 2017, Vol. 17 ›› Issue (5): 1072-1077.DOI: 10.12034/j.issn.1009-606X.217140

• 材料工程 • 上一篇    下一篇

AlCl3-NaCl复盐为铝源电解共沉积制备镁铝合金

刘 洋1,2， 卢旭晨1*， 张志敏1， 陈世伟1,2     

  1. 1. 中国科学院过程工程研究所多相复杂系统国家重点实验室，北京 100190；2. 中国科学院大学化工学院，北京 100049
  • 收稿日期:2017-02-20 修回日期:2017-03-30 出版日期:2017-10-20 发布日期:2017-10-10
  • 通讯作者: 刘洋 yliu_home@126.com
  • 基金资助:
    高纯熔盐电解质制备及金属镁和镁合金制备

Preparation of Mg-Al Alloys via Electrochemical Co-deposition Using AlCl3-NaCl Double Salt as Al Source

Yang LIU1,2,  Xuchen LU1*,  Zhimin ZHANG1,  Shiwei CHEN1,2     

  1. 1. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, CAS, Beijing 100190, China; 2. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-02-20 Revised:2017-03-30 Online:2017-10-20 Published:2017-10-10

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摘要： 以所制AlCl3?NaCl复盐为铝源、MgCl2?6H2O脱水所制熔盐为电解质，电解共沉积制备镁铝合金. 结果表明，当复盐中AlCl3摩尔分数小于0.4时，其在高温下相对稳定，加入高温电解质中可有效减小AlCl3的挥发损失；采用AlCl3摩尔分数小于0.5的AlCl3?NaCl复盐作铝源所制镁铝合金的铝含量比直接以AlCl3为铝源所制镁铝合金提高了9.5%以上，AlCl3利用率明显提高，有效减小了铝含量与理论值的偏差；随熔盐电解质中AlCl3浓度增加，所制镁铝合金中铝含量增加，二者呈良好的线性关系，所制Mg?13%Al合金成分宏观分布较均匀，晶粒大小为50?100 ?m.

关键词: AlCl3-NaCl复盐, 电解共沉积, 复盐脱水, 六水氯化镁, 镁铝合金

Abstract: Mg?Al alloy was prepared using electrochemical co-deposition method with AlCl3?NaCl double salt as Al source and molten salt prepared by the dehydration of MgCl2?6H2O as the electrolyte. The results showed that the AlCl3?NaCl double salt was relatively stable at high temperature when AlCl3 molar fraction was less than 0.4. The volatile loss of AlCl3 could be effectively reduced when using AlCl3?NaCl double salt as Al source to feed into molten system of high temperature. When the mole fraction of AlCl3 in the double salts was less than 0.5, the usage efficiency of AlCl3 was high in the process of preparation Mg?Al alloy, and Al content in Mg?Al alloy was increased by 9.5% at least compare with those alloys prepared by using AlCl3 as Al source, the deviation from theoretical value of Al content in Mg?Al alloy reduced. Al content in Mg?Al alloy increased linearly with the increase of the AlCl3 content in the molten salt, and the Mg?13%Al alloy has relatively uniform element distribution at macro level, and the grain size of alloy was 50?100 ?m.

Key words: AlCl3-NaCl double salts, electrochemical co-deposition, dehydration in complex salts, magnesium chloride hexahydrate, Mg-Al alloys