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›› 2017, Vol. 17 ›› Issue (1): 119-122.DOI: 10.12034/j.issn.1009-606X.216264CSTR: 32067.14.jproeng.216264

• 过程与工艺 • 上一篇    下一篇

NaCl-KCl熔盐体系中Cr2+在W电极上的电化学行为

刘威1,肖赛君2,王振3   

  1. 1. 安徽工业大学冶金工程学院
    2. 安徽工业大学冶金与资源学院
    3. 上海大学材料科学与工程学院
  • 收稿日期:2016-07-28 修回日期:2016-09-06 出版日期:2017-02-20 发布日期:2017-02-22
  • 通讯作者: 肖赛君 xiaosaijunzj@yahoo.com

Electrochemical Behavior of Cr(II) Ion in NaCl?KCl Melt at W Electrode

Liu Wei 1,XIAO Sai-jun 2,WANG Zhen 3   

  1. 1. School of Metallurgy Engineering, Anhui University of Technology
    2. School of Metallurgy and Resource, Anhui University of Technology
    3. School of Materials Science and Engineering, Shanghai University
  • Received:2016-07-28 Revised:2016-09-06 Online:2017-02-20 Published:2017-02-22
  • Contact: XIAO Sai-jun xiaosaijunzj@yahoo.com

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摘要： 通过循环伏安、方波伏安、计时电位等电化学方法对710℃下NaCl?KCl熔盐体系中Cr2+在钨电极上的电化学行为进行了研究. 结果表明，Cr2+在W电极上发生一步还原反应Cr2++2e?=Cr，是由扩散控速的准可逆反应，循环伏安法和计时电位法计算的扩散系数分别为1.27?10?5和2.24?10?5 cm2/s，表明在该体系中在W电极上恒压电解制备金属铬是可行的.

关键词: 熔盐, 铬, 电化学行为, 扩散系数, 恒压电解

Abstract: The cathodic behavior of Cr(II) ion at W electrode in NaCl?KCl molten salts at a temperature of 710℃ was investigated by cyclic voltammetry, square wave voltammetry, chronopotentiometry. The results indicates that the reduction process of Cr(II) to Cr at W electrode was a one step process: Cr2++2e?=Cr. The reduction of Cr(II) is a quasi-reversible process controlled by diffusion mass transfer. The diffusion coefficients of Cr(II) calculated by the data of cyclic voltammetry and chronopotentiometry, is 1.27?10?5 and 2.24?10?5 cm2/s, respectively. Potentiostatic electrolysis performed on the W electrode proved the feasibility of electrodepositing metallic chromium in the molten NaCl?KCl?CrCl2 system.

Key words: molten salt, chromium, electrochemical behavior, diffusion coefficients, potentiostatic electrolysis