ISSN: 1003-6326
CN: 43-1239/TG

Vol. 27    No. 5    May 2017

Influence of pulsed parameters on titanium electrodeposited from LiCl-NaCl-KCl-TiClx molten salt
ZHANG Long, ZHU Jun, SONG Yang, LU Jian-hong, JIAO Shu-qiang
(State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China)
Abstract: The pulsed electrodepositon behaviors of titanium on nickel cathode were investigated in LiCl-NaCl-KCl-TiClx molten salt at 550 ℃ by a molten electrolysis method using TA3 titanium plate as anode. And the effects of pulsed electrodeposition parameters on cathode products were also investigated. The results show that the electrochemical behavior of Ti3+ → Ti at cathode is a two-step diffusion-controlled process with intermediate Ti2+ and Ti+. Comparing with galvanostatic electrodeposition, the products obtained by pulsed electrodeposition have higher compactness, higher crystallinity, and lower oxygen and nitrogen contents. The parameters of pulsed electrodeposition have important influences on the deposited products. When the electrolysis cycle time is short (tc=10 min) and the ratio of current on/off (n) is higher or lower, the size of the products is smaller and the current efficiency is lower. The compact titanium products with large grains and current efficiency of 87.4% are obtained at cathodic current density of 0.3 A/cm2 when tc=20 min and n=1.
Key words: titanium; pulsed electrodeposition; molten electrolysis; cathode current efficiency
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU)