Materials Transactions Online

Materials Transactions, Vol.58 No.03 (2017) pp.377-382
© 2017 The Japan Institute of Metals and Materials

Electrochemical and Chemical Behaviors of Titanium in AlCl3-BMIC Melt

Cunying Xu1, 2, Yawei Liu1, Yixin Hua1, 2, Jian Li1, 2 and Qibo Zhang1, 2

1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, P. R. China
2State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization, Kunming, 650093, P. R. China

The electrochemical and chemical behaviors of titanium were examined in aluminum chloride-1-butyl-3-methylimidazolium chloride (AlCl3-BMIC) ionic liquid. The reduction of Ti(IV) in AlCl3-BMIC occurs in three consecutive steps: Ti(IV) → Ti(III) → Ti(II) → Ti, and Ti(III) ion can quickly react with Cl anion to form sparingly soluble TiCl3. However, No elemental titanium can be obtained in either acidic or basic AlCl3-BMIC melt. Metal titanium can be oxidized to Ti(II) by Ti(IV) in AlCl3-BMIC melt. In addition, the anodic oxidation rate of titanium obviously increases in the presence of Ti(IV) and Ti(III) ions, suggesting that the anodic dissolution of titanium involves chemical dissolution. These results indicate that it is difficult to nucleate or stabilize pure titanium in ionic liquid, which makes pure titanium deposition quite difficult.


(Received 2016/08/31; Accepted 2016/11/14; Published 2017/02/25)

Keywords: titanium, electrochemistry, chemical behaviors, ionic liquids

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