Abstract
The oxidation behavior of GTMSU718 alloy with 87.5wt.% Na2SO4+5wt.% NaCl+7.5wt.% NaVO3 (3SM) was studied at 650°C. Cyclic oxidation studies with 3SM show more weight gain than 2SM (90wt.% Na2SO4+10wt.% NaCl). It indicates that NaVO3 accelerates the oxidation behavior. Isothermal studies show a repetitive NaVO3 formation by combination of V2O5 and Na2SO4 until Na2SO4 is exhausted. Cr depletion layer occurs due to formation of Cr-sulphides, CrVO4 and liberation of Na2Cr2O7. Based on the detailed critical analysis, a plausible hot corrosion mechanism with 3SM was analysed to be basic fluxing mechanism, in parallel with sulphidation followed by oxidation.
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