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Cathodic electrochemical behavior in Na3AlF6-Al2O3-LiF-based melts at tungsten electrode with various cryolite ratios

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Abstract

The cathodic behavior at tungsten electrode in Na3AlF6-Al2O3-LiF-based melt with various cryolite ratios was investigated by means of potentiodynamic cathodic polarization, potentiostatic electrolysis, chronopotentiometry, and open-circuit chronopotentiometry. The results show that the formation process of Al–W intermetallic compound is controlled by both diffusion and charge transfer when the cryolite ratio is below 2.5, and is completely controlled by diffusion when cryolite ratio is above 2.5. The deposition process of metal aluminum is completely charge-transfer controlled. Sodium vapor releases along with the deposition of metal aluminum as crylite ratio increases, which leads to a great influence on current efficiency. When the cryolite ratio is lower than 2.0, the critical cathodic current density of deposited aluminum at tungsten electrode is about 150 mA·cm−2, but the current density is above 200 mA·cm−2 under other experimental conditions. A higher cryolite ratio can cause a higher cathodic overvoltage. The relative content of Al layer is higher with the decrease of cryolite ratio, and Al layer easily strips into the molten salt when the cryolite ratio is higher than 2.5.

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Acknowledgments

The work was financially supported by the National Basic Research Program of China (No.2013CB632606-1) and the National Natural Science Foundation of China (No.51204044)

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  1. School of Metallurgy and Materials, Northeastern University, Shenyang, 110819, China

    Shao-Hu Tao, Yue-Zhong Di, Jian-Ping Peng, Ke-Jia Liu, Ying-Long Li & Nai-Xiang Feng

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  1. Shao-Hu Tao
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Correspondence to Jian-Ping Peng.

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Tao, SH., Di, YZ., Peng, JP. et al. Cathodic electrochemical behavior in Na3AlF6-Al2O3-LiF-based melts at tungsten electrode with various cryolite ratios. Rare Met. 37, 40–46 (2018). https://doi.org/10.1007/s12598-014-0392-2

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  • DOI: https://doi.org/10.1007/s12598-014-0392-2

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