The influence of fluoride anion on the equilibrium between titanium ions and electrodeposition of titanium in molten fluoridechloride salt

Jianxun Song, Qiuyu Wang, Xiaobo Zhu, Jungang Hou, Shuqiang Jiao, Hongmin Zhu

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

NaClKClTiClxwas prepared via using titanium sponge to reduce titanium tetrachloride in a NaClKCl melt under a negative pressure at 1023 K. The relationship between titanium valence states and [F]/[Ti] molar ratios was investigated with successive adding potassium fluoride in the pre-prepared NaClKClTiClx. It was found that the average valence of titanium ions tended to be stable around 3.0 when [F]/[Ti] molar ratio was greater than 1.80. The equilibrium redox potentials, ETi3+=Ti2+ , ETi4+=Ti3+ , ETi3+=Ti and ETi2+=Ti, were also calculated through the obtained concentration of equilibrium titanium ions with different molar ratios of [F]/[Ti]. Meanwhile, the influence of the fluoride anion on over-potential and characteristics of titanium electrodeposition were investigated through changing the molar ratio of [F]/[Ti]. The results showed that, with the increasing of [F]/[Ti] molar ratios, the grain size of electrodeposition products became smaller, while the over-potential was higher.

Original languageEnglish
Pages (from-to)1299-1303
Number of pages5
JournalMaterials Transactions
Volume55
Issue number8
DOIs
Publication statusPublished - 2014 Jan 1
Externally publishedYes

Keywords

  • Average valence
  • Electrodeposition
  • Equilibrium constant
  • FTi molar ratio
  • Redox potential

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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