NaCl-KCl熔盐体系中AlF_3氟化Tb_4O_7电化学制备Al-Tb合金（英文）  

Electrochemical Formation of Al-Tb Alloys from Tb_4O_7 Fluorinated by AlF_3 in NaCl-KCl Melts

作　　者：韩伟[1] 季男 李梅[1] 王珊珊[1] 杨晓光[1] 张密林[1] 颜永得[1] HAN Wei JI Nan LI Mei WANG Shan-Shan YANG Xiao-Guang ZHANG Mi-Lin YAN Yong-De(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)

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,教育部超轻材料与表面技术重点实验室,哈尔滨150001

出　　处：《物理化学学报》2016年第10期2538-2544,共7页Acta Physico-Chimica Sinica

基　　金：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);Fundamental Research Funds for the Central Universities,China(HEUCF2016012)~~

摘　　要：在NaCl-KCl-Tb_4O_7-AlF_3体系中为了制备Al-Tb合金,首先对熔盐中的上清液和沉淀物进行了分析,X射线衍射(XRD)结果确定了Tb_4O_7能被AlF_3氟化生成TbF_3。采用一系列的电化学方法对NaCl-KCl-AlF_3-Tb_4O_7体系在Mo电极上的电化学行为进行了研究。循环伏安、方波伏安、计时电位和开路计时电位等电化学方法的研究结果表明T b(III)在预先沉积的Al电极上发生欠电位沉积。在不同条件下进行恒电流电解制备了Al-Tb合金,并对所得合金样品进行XRD和扫描电镜-能量散射谱(SEM-EDS)表征。结果表明在-2.5A进行恒电流电解得到的Al-Tb合金是由Al和Al_3Tb两相组成。采用电感耦合等离子体-原子发射光谱仪(ICP-AES)对实验所得沉积物的组成进行分析,研究了电解条件对合金组成和电流效率的影响。在电流强度为-1.5A进行恒电流电解2h,电流效率可达76.5%。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.

关 键 词：电化学行为 TB4O7 共还原 NaCl-KCl熔盐 Al-Tb合金 电流效率 

分 类 号：TG146.21[一般工业技术—材料科学与工程]