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

• Published in: Rare metals Vol. 37; no. 1; pp. 40 - 46
• Main Authors: Tao, Shao-Hu, Di, Yue-Zhong, Peng, Jian-Ping, Liu, Ke-Jia, Li, Ying-Long, Feng, Nai-Xiang
• Format: Journal Article
• Language: English
• Published: Beijing Nonferrous Metals Society of China 01.01.2018; Springer Nature B.V
• Subjects: Aluminum; Aluminum oxide; Biomaterials; Cathodic polarization; Charge transfer; Chemistry and Materials Science; Cryolite; Current density; Current efficiency; Deposition; Electrochemical analysis; Electrodes; Electrolysis; Energy; Intermetallic compounds; Lithium fluoride; Materials Engineering; Materials Science; Melts; Metallic Materials; Molten salts; Nanoscale Science and Technology; Physical Chemistry; Sodium vapor; Tungsten; 冰晶石;钨电极;比率;电气化学;融化;行为;转移控制;水流密度; Cathodic electrochemistry; LiF; Cryolite ratio; Aluminum electrolysis
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-014-0392-2

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 above2.5. 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.