Corrosion of Materials in Supercritical CO2 Environments

by R. G. Ballinger, M. Dunlevy, G. Eastwick, J. Gibbs, J. Lim, T. J. McKrell
Massachusetts Institute of Technology

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The corrosion behavior of several metallic alloys have been determined in supercritical CO2 at 650°C and CO2 pressures from 12 - 22 MPA for exposure times from 500 to 3000 hours. Specially constructed high pressure test systems were constructed for this purpose. Residual Gas Analysis (RGA) monitoring of the gas inlet and outlet verified that the gas chemistry was constant during the tests. Weight gains as well as extensive surface analysis were performed to characterize the resulting scales and degree of penetration.

Alloys tested included stainless steels, ODS steels, martensitic alloys, and nickel alloys. Results indicate that materials that form alumina/chromia scales are the most resistant to corrosion. Of the austenitic alloys, Type 316 stainless steel exhibited the poorest performance. The ferritic materials exhibited the poorest corrosion resistance overall.