The Cathodic Behavior of Ti(III) Ion in a NaCl-2CsCl Melt

The cathodic behavior of Ti(III) ions in a NaCl-2CsCl melt was investigated by cyclic voltammetry, chronopotentiometry, and square wave voltammetry with a tungsten electrode being the working electrode at different temperatures. The results show that the cathodic behavior of Ti(III) ion consists of two irreversible steps: Ti3+ + e = Ti2+ and Ti2+ + 2e = Ti. The diffusion coefficient for the Ti(III) ion in the NaCl-2CsCl eutectic is 1.26 x 10(-5) cm(2) s(-1) at 873 K (600 A degrees C), increases to be 5.57 x 10(-5) cm(2) s(-1) at 948K (675A degrees C), and further rises to 10.8 x 10(-5) cm(2) s(-1) at 1023 (750 A degrees C). Moreover, galvanostatic electrolysis performed on a titanium electrode further presents the feasibility of electrodepositing metallic titanium in the molten NaCl-2CsCl-TiCl3 system.