A corrosion model in the presence of molten salts takes into account the diffusion process, the dissolution/deposition process, and reaction of the oxide with the molten salt. This model was applied to the corrosion of iron-coated (Li0.52Na0.48)(2)CO3 under 33% O-2-67% CO2 at 798-1023 K. The initial corrosion was accelerated from the parabolic rate law at lower temperature. The model could explain the behavior of the weight gain and the metal loss for the corrosion. The large temperature dependence of the lithiation reaction between the oxide and the salt would explain the initial accelerated corrosion. The parabolic growth rate constant for the inner dense layer for carbonate corrosion was around 30% larger than that for the dry corrosion, and this difference increased with temperature. The diffusion coefficient of Fe in the rate control layer might be increased by the formation of defects involving the alkaline metal of the carbonate. (C) 2004 The Electrochemical Society.