中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 4 No. 4 December 1994 |
MECHANISM OF ELECTRODEPOSITION OF TUNGSTEN IN MOLTEN KF-B2O3-K2WO4
(General Research Institute for Nonferrous Metals; Beijing 100088)
Abstract:The mechanism of electrodeposition of tungsten in molten KF-B2O3-K2WO4 has been investigated by cyclic voltammetry and chronopotentiometry. The results show that the electrochemical reduction of tungsten is a reversible and diffusion-controlled process which occurs in two steps:W(Ⅵ)+4e=W(Ⅱ); W(Ⅱ)+2e=W(0), and the product is insoluble. The values of the diffusion coefficients of the complexion containing W(Ⅵ) measured by the techniques mentioned above are alike. Tungsten electrode is suitable for quasi-refer.
Key words: molten KF-B2O3-K2WO4 tungsten electrodeposition mechanism