The electrochemical behaviour of Ti(Ⅲ) and Ti(Ⅱ) in LiCl-KCl eutectic system has been studied by cyclic voltammetry and chronoamperometry.The cathodic reduction of Ti(Ⅲ) and Ti(Ⅱ) has been found to be stepwise:Ti(...The electrochemical behaviour of Ti(Ⅲ) and Ti(Ⅱ) in LiCl-KCl eutectic system has been studied by cyclic voltammetry and chronoamperometry.The cathodic reduction of Ti(Ⅲ) and Ti(Ⅱ) has been found to be stepwise:Ti(Ⅲ)+e=Ti(Ⅱ),Ti(Ⅱ)+2e =Ti.The reductions are diffusion controlled.When an equilibrium between Ti subchlorides and excess metallic Ti was estab- lished by reaction 2TiCl_3+Ti=3TiCl_2 in LiCl-KCl melt at 475℃,then the average valence of Ti is less than 2.1.In this system the diffusion coefficient for Ti(Ⅱ) ion was calculated as D=2.5×10^(-5)cm^2·s^(-1).The chronoamperometric studies showed that the initial nucleation stage and growth of nuclei were observed when Ti ions were electrodeposited on low carbon steel substrate. The investigation of nucleation of metal may provide the method for obtaining smooth,coherent and adherent deposits of titanium.展开更多
文摘The electrochemical behaviour of Ti(Ⅲ) and Ti(Ⅱ) in LiCl-KCl eutectic system has been studied by cyclic voltammetry and chronoamperometry.The cathodic reduction of Ti(Ⅲ) and Ti(Ⅱ) has been found to be stepwise:Ti(Ⅲ)+e=Ti(Ⅱ),Ti(Ⅱ)+2e =Ti.The reductions are diffusion controlled.When an equilibrium between Ti subchlorides and excess metallic Ti was estab- lished by reaction 2TiCl_3+Ti=3TiCl_2 in LiCl-KCl melt at 475℃,then the average valence of Ti is less than 2.1.In this system the diffusion coefficient for Ti(Ⅱ) ion was calculated as D=2.5×10^(-5)cm^2·s^(-1).The chronoamperometric studies showed that the initial nucleation stage and growth of nuclei were observed when Ti ions were electrodeposited on low carbon steel substrate. The investigation of nucleation of metal may provide the method for obtaining smooth,coherent and adherent deposits of titanium.
