The Hot Corrosion of Metals by Molten Salts

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Abstract
Some theoretical mechanisms for the hot corrosion attack of metals and alloys under thin fused salt filmsare discussed. The chemical fluxing (dissolution) of the protective oxide on a pure metal is proposed to occur wherever the gradient in the oxide solubility in the salt at the oxide/salt interface is negative, such that a reprecipitation of dissolved oxide occurs. In turn, the oxide solubility gradient is established by the nature and site of the electrochemical reduction step which always generates local basicity. The interrelation of the basicity gradient in the melt to the oxide solubility map decides the occurrence of continuing hot corrosion. In the hot corrosion of alloys, the possibility of a synergistic coupling of the dissolution for the several oxides of the components can result depending upon the specific details of the oxide solubility plots and the local basicity as established by the site of the cathodic reduction step.

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