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Corrosion of Fe-9%Cr-1%Mo Steel at 600 and 700℃ in N2/(0.5, 2.5)%H2S-mixed Gas

Lee, Dong Bok;Abro, Muhammad Ali;Yadav, Poonam;Bak, Sang Hwan;Shi, Yuke;Kim, Min Jung

  • Received : 2016.03.29
  • Accepted : 2016.04.12
  • Published : 2016.04.30

Abstract

The T91 steel (Fe-9%Cr-1%Mo) was corroded at 600 and $700^{\circ}C$ for 5 - 70 h in the $N_2$/(0.5, 2.5)%$H_2$Smixed gas at one atm. It was corroded fast, forming the outer FeS layer and the inner (FeS, $FeCr_2O_4$)-mixed layer. The formation of the outer FeS layer facilitated the oxidation of Cr to $FeCr_2O_4$ in the inner layer. Since the nonprotective FeS scale was present over the whole scale, T91 steel displayed poor corrosion resistance.

Keywords

T91 steel;Corrosion;Sulfidation;Oxidation;$H_2S$ gas

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Acknowledgement

Supported by : Korea Institute of Energy Technology Evaluation and Planning (KETEP)