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

The electrochemical behavior of TiB2 anode is investigated in the present work in order to obtain the anodic behavior in molten CaCl2-CaO. The work reveals that the passivation film is generated on the surface of TiB2 anode during the anodic polarization process, leading to a higher pitting potential than that of the Pt electrode. After 100 h potentiostatic electrolysis, the TiB2 anode shows a corrosion rate as low as 1.38 x 10(-3) g cm(-2) h(-1). The formation mechanism of the TiB2 anode passivation film after electrolysis is determined as TiB2 + O2- -> Ti(BO3) + O2- -> TiO2 + CaO -> CaTiO3.

Automated summary

The electrochemical behavior of TiB2 anode in molten CaCl2-CaO was investigated, revealing the formation of a passivation film on the surface of the TiB2 anode during anodic polarization process leading to higher pitting potential than Pt electrode. The corrosion rate of TiB2 anode after 100 h potentiostatic electrolysis was found to be as low as 1.38 x 10(-3) g cm(-2) h(-1), with the passivation film formation mechanism determined as TiB2 + O2- -> Ti(BO3) + O2- -> TiO2 + CaO -> CaTiO3.