Corrosion of 9-12Cr ferritic–martensitic steels in high-temperature CO2. (April 2016)

• Record Type: Journal Article
• Authors: Rouillard, F.; Furukawa, T.
• Is Part Of: Corrosion science. Volume 105(2016)
• Page Start: 120
• Page End: 132
• Publication Date: 2016-04
• Subjects: A. Steel -- C. Carburisation -- C. High temperature corrosion -- C. Oxidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2016.01.009
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: The corrosion behavior of 9-12Cr ferritic steels in CO2 was studied at temperature between 500 and 600 °C and pressures up to 250 bar. 9-12Cr steels oxidized and carburized according to parabolic kinetics. CO2 pressure had a stronger impact on the carburization rate. No "breakaway" oxidation was observed after 8000 h in CO2 at 600 °C. A corrosion mechanism coupling oxidation and carburization is proposed. Abstract: The high temperature corrosion behavior of two 9Cr and 12Cr ferritic–martensitic steel grades was studied under CO2 pressures varying from 1 to 250 bar for exposure times up to 8000 h. No "breakaway" oxidation was observed. 9Cr steel grades suffered from fast parabolic uniform oxidation and fast carburisation. Increasing CO2 pressure had very little effect on the oxidation rate but increased the carburisation rate. The corrosion behavior of both 12Cr steel grades differed and might be influenced by gas composition, minor elements or surface finish. A corrosion mechanism coupling oxidation and carburisation is proposed.