Abstract
H2S corrosion behaviors of P110, Fe-Mn-Al, and Fe-Mn-Cr-Ni high-Mn steels were analyzed according to ion-selectivity of corrosion products. At 60 ºC and 80 ºC, cation-selective troilite restrain diffusion of corrosive ions to the substrate. The corrosion rates were low, and uniform corrosion occurred. At 100 ºC and 205 ºC, anion-selective pyrrhotite caused accumulation of Cl− between corrosion scale and substrate. Corrosion rates were high and localized corrosion happened. Crystal atom stacking models of iron sulfides were built, and the adsorption energy of ions on the exposed surface was calculated to discuss the ion-selectivity mechanism. The effect of alloy elements on corrosion behavior was analyzed.
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