2023/03/27 by Ning Liu, Xing Yang, Jun Chen
Engineering · Materials Science · #Corrosion Behavior and Inhibition #Hydrogen embrittlement and corrosion behaviors in metals #Microstructure and Mechanical Properties of Steels
paper · doi:10.5006/4284
crossref issued 2023/03/27 · crossref published 2023/03/27 · crossref published-online 2023/03/27 · openalex publication_date 2023/03/27 · crossref created 2023/03/28 · crossref published-print 2023/06/01 · crossref deposited 2025/03/18 · openalex created_date 2025/10/10 · crossref indexed 2026/07/27 · openalex updated_date 2026/07/31
The high Mn steels are expected to become a novel steel for liquefied natural gas (LNG) tank building because of their low cost, high strength, and excellent low-temperature impact toughness. Up until now, it is still limited for studies on corrosion behavior of high Mn steel in a Cl–-containing environment. We found that strong Mn enrichment layers always exist in the outer rust layer, whereas strong Al enrichment layers always exist in the inner rust layer. However, the Al and Cl simultaneously enrich in the same area. Although the corrosion resistance can be further improved by increasing Al content from 5.0 mass% to 8.0 mass%, the improvement degree becomes weak and the pitting corrosion becomes serious due to the formation of δ-ferrite. There are two aspects to explain why Al improves corrosion resistance. (1) More Al addition can enhance the resistance of passive oxide. (2) The α-FeOOH content can be increased and the compactness of the rust layer can be also enhanced by increasing Al content.