Study of High Temperature of Inconel 740 Alloy in Air and Ar-0.2%SO2 Gas
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The Ni-based superalloy, Inconel 740, was corroded between 800 and 1100oC for up to 100 hr in air and Ar-0.2%SO2 gas in order to study its corrosion behavior in air and sulfur/oxygen environment. It displayed relatively good corrosion resistance in both environment, because its corrosion was primarily dominated by not sulfidation but oxidation especially in Ar-0.2%SO2 gas. Such was attributed to the thermodynamic stability of oxides of alloying elements when compared to corresponding sulfides. The scales consisted primarily of Cr2O3, together with some NiAl2O4, MnCr2O4, NiCrMnO4, and rutile-TiO2. Sulfur from SO2 gas made scales prone to spallation, and thicker. It also widened the internal corrosion zone when compared to air. The corrosion resistance of IN740 was mainly indebted to the formation of protective Cr2O3-rich oxides, and suppression of the sulfide formation.
Abstract
The Ni-based superalloy, Inconel 740, was corroded between 800 and 1100oC for up to 100 hr in air and Ar-0.2%SO2 gas in order to study its corrosion behavior in air and sulfur/oxygen environment. It displayed relatively good corrosion resistance in both environment, because its corrosion was primarily dominated by not sulfidation but oxidation especially in Ar-0.2%SO2 gas. Such was attributed to the thermodynamic stability of oxides of alloying elements when compared to corresponding sulfides. The scales consisted primarily of Cr2O3, together with some NiAl2O4, MnCr2O4, NiCrMnO4, and rutile-TiO2. Sulfur from SO2 gas made scales prone to spallation, and thicker. It also widened the internal corrosion zone when compared to air. The corrosion resistance of IN740 was mainly indebted to the formation of protective Cr2O3-rich oxides, and suppression of the sulfide formation.
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