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Electrodeposition of Mg-Li-Al-La Alloys on Inert Cathode in Molten LiCl-KCl Eutectic Salt

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Abstract

Electrochemical preparation of Mg-Li-Al-La alloys on inert electrodes was investigated in LiCl-KCl melt at 853 K (580 °C). Cyclic voltammograms (CVs) and square wave voltammograms (SWVs) show that the existence of AlCl3 or AlF3 could promote La deposition on an active Al substrate, which is predeposited on inert electrodes. All electrochemical tests show that the reduction of La3+ is a one-step reduction process with three electrons exchanged. The reduction of La(III)→La(0) occurred at –2.04 V, and the underpotential deposition (UPD) of La was detected at –1.55 V (vs Ag/AgCl). The same phenomena concerning La UPD were observed on two inert cathodes, W and Mo. In addition, Mg-Li-Al-La alloys were obtained by galvanostatic electrolysis on the W cathode from La2O3 in LiCl-KCl-MgCl2-KF melts with aluminum as the anode. X-ray diffraction (XRD) measurements indicated that various phases like the Al2La, Al12Mg17, and βLi phase (LiMg/Li3Mg7) existed in the Mg-Li-Al-La alloys. The distribution of Mg, Al, and La in Mg–Li–Al-La alloys from the analysis of a scan electron micrograph (SEM) and energy dispersive spectrometry (EDS) indicated that the elements Mg, Al, and La distributed homogeneously in the alloys.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (21173060), the Fundamental Research funds for the Central Universities (HEUCF101002), and the Scientific Technology Bureau of Harbin (No. 2009RFLXG012) and (No. RC2009LX017005). We also appreciate the support of the Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education. The authors are particularly grateful to professors D.X. Tang, L.Y. He, and Dr. Tom Mann for kindly discussing various parts of the manuscript.

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Authors and Affiliations

  1. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, P.R. China

    Wei Han (Professor), Yi Sun (Ph.D. Graduate), Tao Jiang (Postgraduate) & Milin Zhang (Professor)

  2. China Nuclear Power Operation Technology Corporation, Ltd., Wuhan, 430223, Hubei Province, P.R. China

    Qiong Chen (Postgraduate)

  3. Department of Equipment Research and Design, Research Institute of Nuclear Power Operation, Wuhan, 430223, Hubei Province, P.R. China

    Qiong Chen (Postgraduate)

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  1. Wei Han
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  2. Qiong Chen
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Correspondence to Qiong Chen.

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Manuscript submitted May 21, 2011.

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Han, W., Chen, Q., Sun, Y. et al. Electrodeposition of Mg-Li-Al-La Alloys on Inert Cathode in Molten LiCl-KCl Eutectic Salt. Metall Mater Trans B 42, 1367–1375 (2011). https://doi.org/10.1007/s11663-011-9567-5

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