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Abstract Corroded microstructure of a Cr2O3-Al2O3-ZrO2 refractory brick after 4200 h service in a gasifier was investigated. An isolation layer comprising mainly (Mg, Fe2+)(Cr, Fe)2O4 complex spinel was formed on the… Click to show full abstract
Abstract Corroded microstructure of a Cr2O3-Al2O3-ZrO2 refractory brick after 4200 h service in a gasifier was investigated. An isolation layer comprising mainly (Mg, Fe2+)(Cr, Fe)2O4 complex spinel was formed on the refractory’s surface, which effectively suppressed the infiltration of main corrosive constituents in the slag (FeXO, MgO). Furthermore, a quantitative analysis of main corrosive elements in the corroded/uncorroded interface was carried out based on EDS mapping. The results indicated that the overall corrosion depth was dependent on the penetration distance of FeXO. Finally, the corrosion behavior of Cr2O3-Al2O3 aggregates in the refractory was investigated, and a dissolution-phase separation-crystallization mechanism proposed.
Journal Title: Corrosion Science
Year Published: 2020
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