Corrosion of Fe-2.25%Cr-1.6%W Steel at 600 and 700oC in N2/(0.5, 2.5)%H2S-mixed Gas
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ASTM T23 steel with a composition of Fe-2.25%Cr-1.6%W corroded at 600 and 700oC for 5-70 h in N2/(0.5, 2.5)%H2S-mixed gas at 1 atm. It corroded rapidly, forming the outer FeS scale and the inner (FeS, FeCr2O4)-mixed scale. The ensuing outward diffusion of Fe2+ 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 FeCr2O4 in the inner scale. Since the nonprotective FeS scale existed over the whole scale, T23 steel displayed poor corrosion resistance in the H2S-containing atmosphere.
Abstract
ASTM T23 steel with a composition of Fe-2.25%Cr-1.6%W corroded at 600 and 700oC for 5-70 h in N2/(0.5, 2.5)%H2S-mixed gas at 1 atm. It corroded rapidly, forming the outer FeS scale and the inner (FeS, FeCr2O4)-mixed scale. The ensuing outward diffusion of Fe2+ 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 FeCr2O4 in the inner scale. Since the nonprotective FeS scale existed over the whole scale, T23 steel displayed poor corrosion resistance in the H2S-containing atmosphere.
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