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