In this study, the influence of R_CaO/TiO2 on Ti reduction reaction was investigated by cyclic voltammetry at 1373K ~ 1573K using the bath of R_CaO/TiO2 = 1.0 ~ 2.0, and electrodeposition by potentio-static electrolysis was attempted. Typical cyclic voltammograms in the bath of various R_CaO/TiO2 were shown in Fig.1. Although no sharp current peak was seen, some current peak/humps appeared; three current peak/humps were observed in the bath of R_CaO/TiO2 = 1.0 and 1.325, while two current peak/humps were seen in the bath of R_CaO/TiO2 = 1.5, 1.8 and 2.0. These results suggest that stable Ti-O complex ions change with R_CaO/TiO2, and that they affect the Ti reduction.

Titanium metal was obtained by potentio-static electrolysis regardless of R_CaO/TiO2, but the situation of Ti metal deposition depended on R_CaO/TiO2 and the electrolysis potential; Ca metal was apt to co-deposited with Ti metal deposition in the bath of R_CaO/TiO2 = 1.0 and 1.325, while Ti metal was obtained without Ca co-deposition in the bath of R_CaO/TiO2 = 1.5, 1.8 and 2.0. The suitable electrolytic potential for Ti metal deposition without Ca co-deposition seemed around -1.8V (vs. Mo dissolution potential).

From the reseachers by cyclic voltammetry and potentio-static electrolysis, it was shown that the electrodeposition of Ti metal in molten CaCl₂ containing TiO₂ strongly depended on the bath composition and the electrolytic potential deposition. The suitable molar ratio of CaO to TiO₂, R_CaO/TiO2, in the bath is thought to be around, and the suitable potential was -1.8V.