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The electrochemical reaction mechanism and electrocrystallization process of tungsten in the NaCl–KCl–NaF–WO3molten salt were investigated at 973 K(700°C)by means of cyclic voltammetry,chronopotentiometry,and chronoamperometry techniques.The results show that the electrochemical reaction process of tungsten in the NaCl–KCl–NaF–WO3molten salt system is a quasireversible process mix-controlled by ion diffusion rate and electron transport rate.Tungsten ion in this system is reduced to W(0)in two steps.The electrocrystallization process of tungsten is found to be an instantaneous,hemispheroid three-dimensional nucleation process and the tungsten ion diffusion coefficient of 2.361 9 10-4cm2s-1is obtained at experimental conditions.
The electrochemical reaction mechanism and electrocrystallization process of tungsten in the NaCl-KCl-NaF-WO3 molten salt were investigated at 973 K (700 ° C) by means of cyclic voltammetry, chronopotentiometry, and chronoamperometry techniques. The results show that the electrochemical reaction process of tungsten in the NaCl-KCl-NaF-WO3 molten salt system is a quasireversible process mix-controlled by ion diffusion rate and electron transport rate. Tungsten ion in this system is reduced to W (0) in two steps. The electrocrystallization process of tungsten is found to be an instantaneous, hemispheroid three-dimensional nucleation process and the tungsten ion diffusion coefficient of 2.361 9 10-4cm2s-1is obtained at experimental conditions.