LiCl-NaCl熔融盐体系镁铝合金电化学共沉积的实现

Realization of Mg-Al alloy preparation by electrochemical co-deposition in LiCl-NaCl molten salt system

采用循环伏安法、电位扫描法和阶跃电流法在973 K的LiCl-NaCl-MgCl_2-AlCl_3熔融盐体系中,对Mg-Al共沉积的可行性进行探讨。结果表明,当Al^(3+)阴极电化学过程为极限扩散控制时,Mg和Al可以在相同的电位下在阴极共同析出,合金理论沉积电压稳定在氯化镁的分解电压附近,随着电解的进行,阴极极化程度逐渐减小,导致槽电压降低。

The feasibility of Mg-Al co-deposition by adopting cyclic voltammetry （CV） , linear sweep vohammetry （LSV） and current step technique in LiCl-NaCl-MgCl2-AlCl3 molten salt system at 973K was investigated. The test result shows that Mg and A1 could be co-deposited on cathode under the same potential as long as electrochemical process of Al3＋ on cathode was controlled by diffusion limit. Alloy theoretical deposition voltage was detected stable near the decomposition voltage of MgCl2. The cell voltage was decreased during the process of electrolysis because of the declining of cathode polarization degree.