High Temperature Corrosion of Chromium–Manganese Steels in Sulfur Dioxide |
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| Authors: | Z ?urek J Gilewicz-Wolter M Hetmańczyk J Duda?a A Stawiarski |
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| Affiliation: | (1) Institute of Inorganic Chemistry and Technology, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland;(2) Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland;(3) Faculty of Materials Science, Metallurgy and Transport, Silesian Technical University, ul. Krasińskiego 8, 40-019 Katowice, Poland |
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| Abstract: | This work was aimed at explaining the corrosion mechanism of commercial Cr–Mn steels at 1073, 1173 and 1273 K in the atmospheres
containing oxygen and sulfur. Three steels were selected for the investigations, two single-phase austenitic steels (Cr17Mn17
and Cr13Mn19SiCa) and a two-phase austenitic-ferritic steel Cr15Mn19. On all studied steels triplex scales were formed. The
inner very thin, fine-grained part of the scale contained manganese, chromium and iron sulfides and oxides, the intermediate
layer was built mainly of the MnCr2O4 spinel while MnO was the predominant constituent of the outer scale layer. According to the gravimetric measurements, after
an initial incubation period, the oxidation of steel follows a parabolic rate law. Thermodynamic and kinetic aspects of the
formation of oxide-sulfide and oxide layers were discussed. Oxidation was accompanied by depletion of the subscale region
of the metallic core in manganese, which is the austenite former. Consequently austenite transformed into ferrite. |
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| Keywords: | Cr– Mn steels SO2 oxidation sulfur transport |
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