발간논문

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Vol.51, No.7, 505 ~ 514, 2013
Title
Corrosion of Inconel 713 Alloy in an Ar-1% SO2 Atmosphere between 800 and 1100℃
Sang Hwan Bak , Dong Bok Lee
Abstract
The Ni-based superalloy, Inconel 713, was corroded between 800 and 1100℃ for up to 100 h in an Ar-1% SO2 atmosphere. It displayed good corrosion resistance, because the corrosion progressed mainly via oxidation rather than sulfidation. The corrosion products were α-Al2O3, Cr2O3, TiO2, NiO, NiAl2O4, and NiCr2O4. Sulfur was sometimes weakly segregated around the scale-alloy interface. Preferential oxidation occurred along the grain boundaries of the matrix. Except in these areas, uniform oxidation occurred, forming thin scales. The formed scales were prone to spallation.
Key Words
alloys, casting, corrosion, oxidation, scanning electron microscopy, IN 713 superalloy
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