Anodic Polarization of Nickel in Alkali Metal Carbonates,
ARMY FOREIGN SCIENCE AND TECHNOLOGY CENTER CHARLOTTESVILLE VA
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Anodic polarization of nickel in a molten triple eutectic mixture of alkali metal carbonates was studied at 600-800C. It was shown that the self-diffusion current of nickel is small in a melt of alkali metal carbonates, in the absence of thermal dissociation. At higher current densities, migration of nickel into the melt is accompanied by formation of a film which is difficult to dissolve, of nickel monoxide 600C or a solid solution of Li2O-NiO 800C, which inhibits the process of anode solution of the metal. It was determined that the solid LiO2-NiO film passivates nickel more strongly than the friable nickel monoxide, which retards nickel oxidation negligibly.
- Physical Chemistry