Electrochemistry of Titanium and the Electrodeposition of Al-Ti Alloys in the Lewis Acidic Aluminum Chloride-1-Ethyl-3-Methylimidazolium Chloride Melt

Published

April 1, 2003

Author(s)

T Tsuda, C L. Hussey, Gery R. Stafford, John E. Bonevich

Abstract

The chemical and electrochemical behavior of titanium was examined in the Lewis acidic aluminum chloride-l-ethyl-3-methylimidazolium chloride (AlCl₃-EtMelmCl) molten salt at 353.2 K. Dissolved Ti (II), as TiCl₂, is stable in the 66.7 : 33.3 m/o composition of this melt, but shows a slight tendency to disproportionate in the 60.0-40.0 m/o melt. At low current densities, the anodic oxidation of Ti (0) does not lead to dissolved Ti (II), but to an insoluble passivating film of TiCl₃. At high current densities or very positive potentials, Ti (O) is oxidized to Ti (IV); however, the electrogenerated TI (IV) vaporizes from the melt as TiCl₄(g). As found by other researchers working in Lewis acidic AlCl₃-NaCl, TI (II) tends to form polymers as its concentration in the AlCl₃-EtMelmCl melt is increased. The electrodeposition of Al-Ti alloys was investigated at Cu rotating disk and wire electrodes. Al-Ti alloys containing up to approximately equal to} 19 a/o titanium could be electrodeposited from saturated solutions of TI (II) in the 66.7 : 33.3 m/o melt at low current densities, but the titanium content of these alloys decreased as the reduction current density was increased. The pitting potentials of these electrodeposited Al-Ti alloys exhibited a positive shift with increasing titanium content comparable to that observed for alloys prepared by sputter deposition.

Citation

Journal of the Electrochemical Society

Volume

150 No. 4

Pub Type

Journals

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Keywords

aluminum chloride, aluminum titanium, current densities, electrodeposited

Citation

Tsuda, T. , Hussey, C. , Stafford, G. and Bonevich, J. (2003), Electrochemistry of Titanium and the Electrodeposition of Al-Ti Alloys in the Lewis Acidic Aluminum Chloride-1-Ethyl-3-Methylimidazolium Chloride Melt, Journal of the Electrochemical Society, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=853189 (Accessed April 29, 2024)