Simulation and experimental study of the mechanism of degradation channel-diffusion of due to high temperature corrosion of anode metal alloy

Corrosion attack of metal alloys used as anodes during aluminum electrolysis is investigated. The mechanism of destruction, which is based on the interaction of the metal surface with active oxygen liberated at the anode during electrolysis, is discussed. Further interaction of unstable oxide with the molten fluorides leads to the fluorination of the metal oxide and its removal into the electrolyte. The mechanism of the process examined is proposed and experimentally confirmed. It is shown that the reaction diffusion and the chemical interaction of iron with oxygen are processes that result in the high rate of degradation.