Corrosion of Carbon Steel with and without Aluminized Coating in (O, S, H)-containing Gases at 500-800℃

The carbon steel formed the thick, somewhat porous, loosely adherent iron oxide scale when oxidized at <TEX>500-800∘C</TEX> for 15 h in air. It formed the thicker, more porous, nonadherent scale consisting of FeS plus iron oxides in <TEX>Ar/1%SO₂</TEX>-mixed gas. It formed the much thicker, more porous, nonadherent scale consisting of FeS plus iron oxides in Ar/0.1% <TEX>H₂S</TEX>-mixed gas. However, the aluminized carbon steel formed the thin, protective <TEX>Al₂O₃</TEX> surface scale even in <TEX>Ar/1%SO₂</TEX>-, and <TEX>Ar/0.1%H₂S</TEX>-mixed gas. Aluminizing drastically improved the corrosion resistance in (O, S, H)-containing gas.