Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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High-Temperature Corrosion Characteristics of T22 and T92 Steel in SO2-Containing Gas at 650 ℃

650 ℃의 SO2 가스 환경 하에서 T22와 T92 강의 고온 부식특성

  • Jung, Kwang-Hu (Division of marine engineering, Graduate school, Mokpo national maritime university) ;
  • Kim, Seong-Jong (Division of marine engineering, Mokpo national maritime university)
  • 정광후 (목포해양대학교 대학원 기관시스템공학과) ;
  • 김성종 (목포해양대학교 기관시스템공학부)
  • Received : 2019.11.05
  • Accepted : 2019.12.05
  • Published : 2019.12.31
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Abstract

In this study, the corrosion characteristics of T22 and T92 steel were investigated in 6O2 + 16CO2 + 2SO2 gas environment at 650 ℃. Corrosion characteristics were characterized by weight gain, oxide layer thickness, scanning electron microscope, optical microscope, energy dispersive X-ray spectroscopy, and X-ray diffraction. T22 and T92 steel tended to stagnate oxide layer growth over time. Oxidation kinetics were analyzed using the data of oxide layer thickness, and a regression model was presented. The regression model was significantly acceptable. The corrosion rate between the two steels through the regression model showed significant difference. The T92 steel was approximately twice as large as the time exponent and showed very good corrosion resistance compared to the T22 steel. In both steels, the oxide layer mainly formed a Fe-rich oxide layer composed of hematite (Fe2O3), magnetite (Fe3O4), and spinel (FeCr2O4). Sulfide segregation occurred in the oxide layer due to SO2 gas. However, the locations of segregation for the T22 and T92 steel were different.

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References

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