Effect of Impurities on Corrosion of Steel in Supercritical CO2

Abstract

Abstract The differences in the geographical distribution of CO2 emitters and potential geologic storage sites will necessitate co-mingling of captured and pressurized CO2 from diverse sources using gathering lines and transporting it through transmission pipelines to the storage sites. The effects of supercritical CO2 on the general corrosion of carbon steel pipelines is unknown. Corrosion of carbon steel associated with water and impurities in supercritical CO2 was studied by Electrochemical Impedance Spectroscopy in autoclaves. The impurities studied included SO2, NO2 and O2. Results are presented in terms of the phase behavior and speciation. Gaps in knowledge are also identified.