Corrosion of Materials in Supercritical Carbon Dioxide Environments

摘要

The corrosion behavior of several metallic alloys have been determined in Supercritical CO_2 at 650°C and CO_2 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.