한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제49권4호
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  • Pages.339-343
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  • 2016
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  • 1225-8024(pISSN)
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  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
권호 표지
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Corrosion of Fe-2.25%Cr-1.6%W Steel at 600 and 700℃ in N2/(0.5, 2.5)%H2S-mixed Gas

  • Lee, Dong Bok (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Bak, Sang Hwan (School of Advanced Materials Science and Engineering, Sungkyunkwan University)
  • 투고 : 2016.07.06
  • 심사 : 2016.07.29
  • 발행 : 2016.08.31
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초록

ASTM T23 steel with a composition of Fe-2.25%Cr-1.6%W corroded at 600 and $700^{\circ}C$ for 5-70 h in $N_2$/(0.5, 2.5)%$H_2S$-mixed gas at 1 atm. It corroded rapidly, forming the outer FeS scale and the inner (FeS, $FeCr_2O_4$)-mixed scale. The ensuing outward diffusion of $Fe^{2+}$ ions during corrosion led to the protrusion of FeS platelets over the outer FeS scale. The formation of FeS at the surface facilitated the oxidation of Cr to $FeCr_2O_4$ in the inner scale. Since the nonprotective FeS scale existed over the whole scale, T23 steel displayed poor corrosion resistance in the $H_2S$-containing atmosphere.

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