LiCl-KCl 共晶溶融塩中における Ti 電解の電極反応

概要

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Cathodic reduction of Ti ions and anodic oxidation of Cl ion were investigated in LiCl-KCl eutectic melt. The experiments were carried out under argon atmosphere at higher temperature than 500℃ with addition of TiCl_3 and/or Ti chips. The results are summarised as follows. Two waves on linear sweep voltammograms were observed when TiCl_3 was added to the melt. The first reduction wave appears at the potential near -0.6V, and is attributed to the step of Ti^<3+>→Ti^<2+>. The second reduction wave appears at -1.1V corresponding to the step of Ti^<2+>→Ti^0. Reduction rate of Ti^<2+>→Ti^0 was proportional to concentration of Ti^<2+>. The reduction potentials at which Ti^<3+>→Ti^<2+> and Ti^<2+>→Ti^0 reductions take place are in good agreement with the theoretical ones calculated from the thermodynamic data. The oxidation of Cl^-→Cl^0 takes place at +1.0V which corresponds well to the theoretical oxidation potential. Electrodeposit at -1.2V in the melt containing Ti^<2+> was found to be titanium metal, by EPMA analysis.
社団法人日本鉄鋼協会の論文
1990-10-01