Corrosion Behaviour of Different Metallic Materials in Supercritical CO2 at 550°C & 250 Bars

by F. Rouillard, F. Charton, & G. Moine
French Alternative Energies and Atomic Energy Commission (CEA)

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In the framework of the development of Brayton cycle with supercritical carbon dioxide for the next generation of nuclear reactors, and more specifically Sodium Fast Reactors, the corrosion behaviour of different structural metallic material for heat exchangers, typically one ferritic-martensitic steel - T91 - and several austenitic steels - 316L, 253MA®, alloy 800- are studied under static carbon dioxide at 550°C and 250 bars. The first results about the nature of the corrosion products, their morphology and their kinetic of formation obtained through different surface analyses reveal that after 310h, the austenitic steels are much more corrosion resistant than the ferritic-martensitic steel thanks to the formation of a protective chromium rich oxide layer. Longer corrosion tests are needed to characterize accurately the corrosion mechanisms and, thus, to ensure that this protective behaviour will not be affected in time.