Chinese Journal of Applied Chemistry

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Preparation of Al-Li-La Alloys by Electrochemical Codeposition in LiCl-KCl-AlCl3-La2O3 Melts

HAN Liyan1, HAN Wei2*, WANG Guanjuan2, SUN Yi2, SUN Tingting2   

  1. (1.Jilin Vocational College of Industry and Technology,Jilin 132013,China;
    2.College of Materials Science and Chemical Engineeing,Harbin Engineering University,Harbin 150001,China)
  • Received:2012-12-11 Revised:2013-03-18 Published:2013-06-10 Online:2013-06-10
  • Contact: HAN Wei

Abstract: Electrochemical codeposition of Al-Li-La alloys were investigated in molten LiCl-KCl-AlCl3-La2O system. The results showed that chlorination of La2O3 by AlCl3 led to the formation of LaCl3 in the molten salts and promote the electrolytic preparation of Al-Li-La alloys. Transient electrochemical techniques, such as cyclic voltammetry and chronopotentiometry, were used to study the reaction mechanism. The electrochemical codeposition of Al, Li and La occurred when cathodic current densities were higher than 0.25 A/cm2 in the LiCl-KCl-AlCl3-La2O3 melts. The influencing factors such as electrolytic temperature, cathodic current density and electrolysis times on alloys were studied and the optimum electrolysis conditions were:a molten salt mixture of LiCl∶KCl∶AlCl3∶La2O3=45∶45∶5∶2(mass raito), an electrolytic temperature of 650 ℃, a cathode current density of 12.5 A/cm2, and electrolysis time of 1 h. X-ray diffraction(XRD) indicated that the Al-Li-La alloys obtained by electrocodeposition mainly consisted of Al2La, and βLi phases.

Key words: Al&, ndash, Li alloys, electrochemical codeposition, molten salts, La2O3

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