Comparative corrosion behaviour of austenitic 316L and duplex 2205 stainless steels: microstructure and property evolution at highly partial pressure of H2S

• Published in: Corrosion Engineering Science and Technology
• Main Author: Shah M.; Ayob M.T.M.; Yaakob N.; Embong Z.; Othman N.K.
• Format: Article
• Language: English
• Published: Taylor and Francis Ltd. 2022
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85115231169&doi=10.1080%2f1478422X.2021.1980647&partnerID=40&md5=c9b512001f3a3f4d67224325e6a59b00

This study extensively compares the corrosion behavior of austenitic 316L and Duplex 2205 stainless-steels at different partial pressures of H2S gases. The results showed that the corrosion rate of both steels at 3 bar H2S showed the highest rate among those parameter setups. 316L steel is dominated by both uniform and pitting corrosion under H2S-containing conditions due to the dissolution of Cr present on the alloy surface. According to the cross-sectional analysis, a Cr enrichment layer formed at 0 bar H2S in both steels. After depletion of the Cr compound in the passive film of both steels, Ni was enriched in the outer layer at 3 bar H2S, forming Ni oxide/sulphide compounds within the passive layer. At 15 bar H2S, Mo was enriched in 316L steel, while Fe and Cr were enriched on the 2205 steel surface. Thus, a kinetic study of the chemical composition of both steels was discussed. © 2021 Institute of Materials, Minerals and Mining Published by Taylor & Francis on behalf of the Institute.