Abstract
The interaction between titanium and Ti4+ ions (K2TiF6), the electroreduction reaction of Ti4+ ions and the anodic reaction of Ti in KCl−NaCl−KF melts with K2TiF6 at 973 K were studied by means of electrochemical and physical measurements. It was found that the fluoride ions played a very important role in these reactions
In KCl−NaCl-3 wt % K2TiF6 molten salts with less than 3 wt % KF, the interaction reaction was considered to proceed as Ti4++Ti=2Ti2+. If the bath contained more than 10 wt% KF, the reaction 3Ti4++Ti=4Ti3+ occurred.
The electrochemical reduction of Ti4+ (K2TiF6) ions in the molten salts with less fluoride ions was observed to proceed according to three reaction steps, i.e. Ti4++e=Ti3+, Ti3++e=Ti2+, Ti2++2e=Ti. In the case of the fluoride ion concentration being higher, two reduction steps, i.e. Ti4++e=Ti3+, Ti3++3e=Ti were suggested.
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Guang-Sen, C., Okido, M. & Oki, T. Electrochemical studies of titanium in fluoride-chloride molten salts. J Appl Electrochem 18, 80–85 (1988). https://doi.org/10.1007/BF01016208
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DOI: https://doi.org/10.1007/BF01016208