Electrochemical studies on the redox behavior of zirconium in the LiF-NaF eutectic melt
Liang Xu (Northeastern University China)
Yanping Xiao (Anhui University of Technology, Zr-Hf-Ti Metallurgie B.V.)
Qian Xu (Shanghai University)
Anthonie van Sandwijk (Zr-Hf-Ti Metallurgie B.V.)
Zhuo Zhao (Anhui University of Technology)
Qiushi Song (Northeastern University China)
Yanqing Cai (Northeastern University China)
Y. Yang (Anhui University of Technology, TU Delft - (OLD) MSE-3)
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Abstract
In the present paper, a detailed study of the redox behavior of zirconium in the eutectic LiF-NaF system was carried out on an inert molybdenum electrode at 750 °C. Several transient electrochemical methods were used such as cyclic voltammetry, square wave voltammetry, chronopotentiometry, and open circuit voltammetry. The reduction of Zr (IV) was found to follow a two-step mechanism of Zr (IV)/Zr (II) and Zr (II)/Zr at the potentials of about −1.10 and −1.50 V versus Pt, respectively. The theoretical evaluations of the number of transferred electrons according to both cyclic voltammetry and square wave voltammetry further confirmed the Zr reduction mechanism. The estimations of Zr (IV) diffusion coefficient in the LiF-NaF eutectic melt at 750 °C through cyclic voltammetry and chronopotentiometry are in fair agreement, as to be approximately 1.13E-5 and 2.42E-5 cm2/s, respectively.
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