Abstract
The corrosion of chromium and manganese by pure SO2 has been investigated in the temperature range 890–1350 K at SO2 pressure from 0.01–0.5 atm. Both metals oxidize according to a parabolic rate law, and the scales consist of an inner region containing a mixture of oxide and sulfide (Cr2O3+ CrS or MnO and MnS) and an outer region of oxide (Cr2O3 or MnO). These two metals have similar thermodynamic behavior, and the main mechanism of reaction is considered to be the direct reaction of the metal with SO2. The results also indicate that in the absence of trace amounts of oxygen, and at sufficiently low temperature (<950 K), the formation of Mn3O4 does not occur only if a complete description of the atmosphere generated by a SO2-O2-S2 mixture was considered.
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Gillot, B., Radid, M. Corrosion in SO2 of chromium and manganese at high temperature. Oxid Met 33, 279–299 (1990). https://doi.org/10.1007/BF00667418
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DOI: https://doi.org/10.1007/BF00667418