Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Study of High Temperature of Inconel 740 Alloy in Air and Ar-0.2%SO2 Gas

대기 및 Ar-0.2%SO2가스에서 Inconel 740 합금의 고온부식 연구

  • Lee, Dong Bok (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Kim, Min Jung (Advanced material application department, Korea Polytechnic College)
  • 이동복 (성균관대학교 신소재공학과) ;
  • 김민정 (한국폴리텍대학 신소재응용과)
  • Received : 2020.12.24
  • Accepted : 2021.03.03
  • Published : 2021.04.30
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Abstract

The Ni-based superalloy, Inconel 740, was corroded between 800 and 1100℃ 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.

Keywords

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2019R1A2C1002641).

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