Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Corrosion and Strength Degradation Characteristics of 1.25Cr-0.5Mo Steel under SO2 Gas Environment

SO2 가스 환경 하에서 1.25Cr-0.5Mo 강의 부식 및 강도 저하 특성

  • Jung, Kwang-Hu (Division of Marine Engineering, Mokpo National Maritime University) ;
  • Kim, Seong-Jong (Division of Marine Engineering, Mokpo National Maritime University)
  • 정광후 (목포해양대학교 기관시스템공학부) ;
  • 김성종 (목포해양대학교 기관시스템공학부)
  • Received : 2018.06.17
  • Accepted : 2018.06.26
  • Published : 2018.06.30
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Abstract

The corrosion and strength degradation characteristics of 1.25Cr-0.5Mo steels were studied under $650^{\circ}C$ in $76%N_2+6%O_2+16%CO_2+2%SO_2$ gas condition up to 500 hrs. Corroded specimens were characterized by weight gain, scanning electron microscope(SEM), energy dispersive X-ray spectroscopy(EDS), and X-ray diffraction(XRD). The tensile test was conducted to evaluate the mechanical strength and fracture mode with corrosion at high temperature. As the results of the experiments, thick Fe-rich oxide layers over $200{\mu}m$ were formed on the surface within 500 hrs. The thick oxide layers are formed with reduction of the cross-sectional area of the specimens. Thus, the strength tended to decrease with reduction of the cross-sectional area.

Keywords

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