High-Temperature Corrosion of Aluminized and Chromized Carbon Steel in N-2-2.5% H2S Gas

作者：Lee Dong Bok^*; Kim Min Jung

来源：Science of Advanced Materials, 2016, 8(1): 128-133.

DOI：10.1166/sam.2016.2615

• Aluminizing
• Chromizing
• H2S Corrosion
• Carbon Steel

Carbon steel with a composition of Fe-0.1C-1.2Mn-0.5Si-0.2Cr (at.%) was either chromized or aluminized via pack cementation, and corroded at 800 degrees C for up to 100 h in N-2-2.5% H2S gas. The chromized coating primarily consisted of an outer (Cr23C6, Cr2N)-mixed layer, and an inner alpha-Fe layer containing Cr. It corroded to FeS, Cr2S3, FeCr2S4, and Cr2O3. The aluminized coating primarily consisted of an outer FeAl layer, and an inner (Fe, Al)-rich diffusion zone. Its corrosion resulted in the formation of a thin, protective alpha-Al2O3 layer on the surface. Aluminizing was better than chromizing at increasing the steel's resistance against corrosion due to the formation of alpha-Al2O3.

• 出版日期2016-1