ELECTROCHEMICAL-BEHAVIOR OF TI-3+ IN LICL-KCL EUTECTIC MELT

Electrochemical behavior of Ti3+ in LiCl-KCl eutectic melt at 773 K has been studied with electrochemical polarization technique. The cathodic polarization curves reveal three current peaks at -0.7 approximately 0.8, -1.2 and -1.5 V, two of which are attributed to the reduction of Ti3+/Ti2+ (-1.2 V) and Ti2+/Ti (- 1.5 V) redox systems. Cyclic voltammograms for reduction of Ti3+ are characteristics of quasi-reversible redox reaction while those for oxidation of Ti2+ show rather complicated phenomenon in relation with the disproportionation reaction as follows: Ti2+ --> Ti3+ + e-2Ti3+ + Ti half arrow right over half arrow left 3Ti2+ The black powdery electrodeposit was obtained by the long time electrolysis and X-ray diffraction analysis shows that main component was metallic Ti.