High-Temperature Corrosion of T92 Steel in N_2/H_2O/H_2S-Mixed Gas

摘要

The ASTM T92 steel was corroded at 600℃ and 800℃ at 1 atm of N_2/3.1%H_2O/2.42%H_2S-mixed gas. The formed scales were thick and fragile. They consisted primarily of the outer FeS scale and the inner (FeS, FeCr_2S_4)-mixed scale containing a small amount of the Cr_2O_3 scale. This indicated that corrosion occurred mainly via sulfidation rather than oxidation due to the H_2S gas. Since FeS was present throughout the whole scale, T92 steel was non-protective, displaying high corrosion rates.