Corrosion behaviors of four stainless steels with similar chromium content in supercritical carbon dioxide environment at 650 °C. (1st August 2019)

• Record Type: Journal Article
• Authors: Chen, Hongsheng; Kim, Sung Hwan; Kim, Chaewon; Chen, Junjie; Jang, Changheui
• Is Part Of: Corrosion science. Volume 156(2019)
• Page Start: 16
• Page End: 31
• Publication Date: 2019-08-01
• Subjects: Stainless steel -- Supercritical carbon dioxide -- High-temperature corrosion -- Oxide layer; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.04.043
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Four stainless steels with similar Cr but varying Ni were oxidized in S−CO2 environment. Weight gains were lower for 430 and 630 SSs than 347H and 316LN SSs after 1000 h. Thick duplex oxide layers were formed on 347H and 316LN SSs following oxide spallation. Spallation was partially attributed to formation of Nb-rich layer or amorphous matters. Austenitic matrix was important reason for oxide spallation of 347H and 316LN SSs. Abstract: The corrosion behavior of four stainless steels (SSs) with similar chromium content was investigated in supercritical carbon dioxide environment. Overall, weight gain was the smallest for 630 SS which formed thin and continuous Cr-rich oxide layer. Due to large Mn3 O4 nodules, weight gain was larger for 430 SS. For 347H and 316LN SSs, thick duplex oxide layers were formed following the extensive oxide spallation, resulting in much greater weight gains than 430 and 630 SSs. The oxide spallation was explained by the formation of Nb-rich layer or amorphous matters at the matrix/oxide interface as well as the matrix structure.