Studies on the corrosion and the behavior of inert anodes in aluminum electrolysis

摘要: The corrosion rates of inert anodes based on tin oxide and nickel ferrite cermet materials were studied as a function some operating parameters. To reach better understanding the mechanism, behavior was observed under specific conditions, such in pure cryolite, at high current densities, different potentials, varying cathode surface areas. It confirmed that low alumina concentrations led to catastrophic densities well NaF/AlF3 molar ratios also detrimental. rate showed minimum (so-called “normal corrosion”) anodic potentials 2.2 2.4 V with respect aluminum. normal is due chemical dissolution anode material reduction products into metal. increased increasing area. At higher than ∼2.5 V, corrosion. Catastrophic can be ascribed decomposition by depletion provoked bulk concentration and/or density.