Electrochemical studies of the reaction between titanium metal and titanium ions in the KCl-NaCl molten salt system at 973 K

The reaction between titanium metal and titanium ions in the KCl?NaCl molten salt system was investigated by means of electrochemical and physical methods at 973 K in an inert gas atmosphere (argon). It was found that the reaction between titanium metal and Ti³⁺ in the molten salts with TiCl₃ followed a simple reaction (I). However, in the case of the concentration of K₂ TiF₆ being higher than 2.7 mol % the reaction was (II); in the case of it being less than 0.8 mol %, reactions (III) and (III′) were followed. $$begin{gathered} 2Ti^{3 + } + Ti = 3Ti^{2 + } (I) hfill 3Ti^{4 + } + Ti = 4Ti^{3 + } (II) hfill Ti^{4 + } + Ti = 2Ti^{2 + } (III) hfill 3Ti^{2 + } = Ti + 2Ti^{3 + } (III')(on cooling) hfill end{gathered} $$ It was also found that these reactions were controlled by charge transfer and diffusion simultaneously.