Citation: HANWei, JI Nan, LI Mei, WANG Shan-Shan, YANG Xiao-Guang, ZHANG Mi-Lin, YAN Yong-De. Electrochemical Formation of Al-Tb Alloys from Tb₄O₇ Fluorinated by AlF₃ in NaCl-KCl Melts[J]. Acta Physico-Chimica Sinica, ;2016, 32(10): 2538-2544. doi: 10.3866/PKU.WHXB201607202 shu

Electrochemical Formation of Al-Tb Alloys from Tb₄O₇ Fluorinated by AlF₃ in NaCl-KCl Melts

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

Received Date: 19 May 2016
Revised Date: 20 July 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (21271054, 11575047, 21173060), Major Research Plan of the National Natural Science Foundation of China (91326113, 91226201), and Fundamental Research Funds for the Central Universities, China (HEUCF2016012).

To prepare Al-Tb alloys from Tb₄O₇ assisted by AlF₃ in NaCl-KCl melts, we initially studied the effect of AlF₃ on the dissolution of Tb₄O₇ by analyzing the supernatant and bottom salts. X-ray diffraction (XRD) results revealed that Tb₄O₇ was fluorinated by AlF₃ to form TbF₃. The electrochemical behavior of the NaCl-KCl-AlF₃-Tb₄O₇ system was investigated using a Mo electrode at 1073 K. Cyclic voltammetry (CV), square wave voltammetry (SWV), chronopotentiometry (CP) and open circuit chronopotentiometry (OCP) analyses indicated that the under-potential deposition of Tb(III) occurred on pre-deposited Al. The co-deposition of Al-Tb alloys was investigated by galvanostatic electrolysis under different conditions. These samples were characterized by XRD and scanning electron microscopy and energy dispersive spectrometry (SEM-EDS). The Al-Tb alloy obtained by galvanostatic electrolysis at -2.5 A consisted of Al and Al₃Tb phases. The effects of the electrolysis conditions on the composition of the alloy and current efficiency were studied by analyzing the compositions of the Al-Tb alloys by inductively coupled plasma-atomic emission spectrometer (ICP-AES). The current efficiency could reach 76.5% under the conditions of galvanostatic electrolysis at -1.5 A for 2 h.
- Electrochemical behavior,
- Tb₄O₇,
- Co-reduction,
- NaCl-KCl melt,
- Al-Tb alloy,
- Current efficiency
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Electrochemical Formation of Al-Tb Alloys from Tb₄O₇ Fluorinated by AlF₃ in NaCl-KCl Melts