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An investigation into the anodic behavior of TiB2 in a CaCl2-based molten salt

Yang Du,Mingyin Kou,Jiguo Tu,Mingyong Wang,Shuqiang Jiao

The electrochemical behavior of TiB 2 anode is investigated in the present work in order to obtain the anodic behavior in molten CaCl 2 -CaO. The work reveals that the passivation film is generated on the surface of TiB 2 anode during the anodic polarization process, leading to a higher pitting potential than that of the Pt electrode. After 100 h potentiostatic electrolysis, the TiB 2 anode shows a corrosion rate as low as 1.38 × 10 -3 g cm -2 h -1 . The formation mechanism of the TiB 2 anode passivation film after electrolysis is determined as TiB 2 + O 2- → Ti(BO 3 ) + O 2- → TiO 2 + CaO → CaTiO 3 .