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Electrochemical behaviour of titanium(II) and titanium(III) compounds in molten lithium chloride/ potassium chloride eutectic melts

Abstract

The nature of the open circuit potentials of Ti and TiC electrodes in titanium(II) and titanium(III) chloride solutions, the apparent valency of the titanium ions in the melt immediately after the anodic dissolution of TiC and Ti, as well as the anodic dissolution of Ti, have been investigated in order to explain the oxidation-reduction process of titanium in lithium chloride-potassium chloride eutectic melts. It is shown that the standard electrode potential for TiC/Ti(III) exceeds that for the oxidation of Ti(II) to Ti(III). The anodic dissolution of TiC anodes give stable Ti(III) species at the standard electrode potentials the contrary to the behaviour of Ti metal anodes where the stable species are Ti(II) ions. Titanium electrodes in TiCl3 solutions of molten lithium chloride-potassium chloride melts behave according to the Ti(III)/Ti(II) redox electrode potential of the reaction: Ti+TiCl3⇌3TiCl2. An anodic dissolution mechanism compatible with all the experimental facts is proposed.

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Popov, B.N., Kimble, M.C., White, R.E. et al. Electrochemical behaviour of titanium(II) and titanium(III) compounds in molten lithium chloride/ potassium chloride eutectic melts. J Appl Electrochem 21, 351–357 (1991). https://doi.org/10.1007/BF01020221

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  • DOI: https://doi.org/10.1007/BF01020221

Keywords

  • Titanium
  • TiCl3
  • Open Circuit Potential
  • Anodic Dissolution
  • Lithium Chloride