中文摘要：

利用循环伏安法、计时电势法和计时电流等方法,研究了钨在700℃的NaCl-KCl-NaF-Na2WO4熔盐中的电化学反应机理和电结晶过程.结果表明,钨的电化学反应过程为由离子扩散速率和电子迁移速率混合控制的准可逆过程,钨的电结晶过程为瞬时形核、三维半球型形核过程,XaCl：XKCl∶XaF∶XNa2WO4=2∶2∶1∶0.01的实验条件下钨离子的扩散速率为2.543×10-5 cm·s-1.

英文摘要：

The electrochemical reaction mechanism and the electrocrystallization process of tungsten in the NaC1-KCl-NaF-Na2WO4 molten salt were investigated at 973 K （700 ℃） by means of cyclic voltammetry,chronopotentiometry and chronoamperometry technique.The results show that the electrochemical reaction process of tungsten is a quasi-reversible process mix-controlled by ion diffusion rate and electron transport rate; the electrocrystallization process of tungsten is an instantaneous hemispheroid three-dimensional nucleation process; the tungsten ion diffusion coefficient is 2.543 × 10-5cm·s-1 at the experimental condition of XNaCl∶XKCl∶XNaF∶ XNa2wo4=2∶2∶1∶0.01.