Abstract
The corrosion of manganese in 1 atm of pure SO2 has been studied from 700 to 900°C. The reaction shows two approximately parabolic stages, the first being faster; the reaction products are MnO and MnS. In the early moments of the reaction a fine mixture of oxide and sulfide is formed directly at the scale surface, which is not in equilibrium with the gas phase due to rate control by the surface reaction. This process ends quickly due to the lowering of the Mn activity at the scale surface, and then an outer region of MnO surmounting a dispersion of coarse MnS particles in the oxide develops. The rate control shifts to solid-state diffusion, and the scale surface equilibrates with the gas. The sulfide is produced in this stage in the interior of the scale as a consequence of sulfur penetration by two mechanisms whose relative importance is discussed. The reaction produces a protective scale, and the rate is close to that for oxidation of Mn in 1 atm O2 at the same temperature.
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Gesmundo, F., de Asmundis, C. & Bottino, C. High-temperature corrosion of manganese in pure SO2 . Oxid Met 14, 15–29 (1980). https://doi.org/10.1007/BF00604101
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DOI: https://doi.org/10.1007/BF00604101