SO2 가스 환경 하에서 1.25Cr-0.5Mo 강의 부식 및 강도 저하 특성
Corrosion and Strength Degradation Characteristics of 1.25Cr-0.5Mo Steel under SO2 Gas Environment
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The corrosion and strength degradation characteristics of 1.25Cr-0.5Mo steels were studied under 650 ℃ in 76%N2+6%O2+16%CO2+2%SO2 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 the evaluate mechanical strength and fracture mode with corrosion at high temperature. As the results of the experiments, thick Fe-rich oxide layers over 200 μm 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.
Abstract
The corrosion and strength degradation characteristics of 1.25Cr-0.5Mo steels were studied under 650 ℃ in 76%N2+6%O2+16%CO2+2%SO2 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 the evaluate mechanical strength and fracture mode with corrosion at high temperature. As the results of the experiments, thick Fe-rich oxide layers over 200 μm 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.
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