The corrosion behavior of several metallic alloys have been determined in Supercritical CO2 at 650°C
and CO2 pressures from 11.5-22.5 MPa for times from 1000 to 3000 hours. To accomplish this custom
designed and fabricated high pressure testing systems were required. Residual Gas Analysis (RGA)
monitoring of the gas inlet and outlet assured consistent gas chemistry. Weight gain as well as extensive
surface analysis were performed to characterize the resulting oxide scales. Alloys tested include
stainless steel Type SS316L, ODS steels MA956, MA957, and PM2000, and martensitic alloys HT9,
T91 and the Russian alloy EP823. Initial results indicate that materials that form alumina/chromia
scales (MA 956) are the most resistant to corrosion while Type SS316L stainless steel exhibited the
poorest performance.