A comprehensive review of metal corrosion in a supercritical CO2 environment

Carbon capture and storage (CCS) is the most effective way to reduce CO2 emissions. In CCS, CO2 transportation plays an important role for the transmission of CO2 from the capturing facility to the location of permanent storage. In order to increase the CO2 density and avoid two-phase flow, CO2 needs to be transformed into the supercritical state. The supercritical CO2 environment poses a threat to pipeline safety because it is a high pressure environment with gaseous impurities. In this paper, the influencing factors of pipeline corrosion under supercritical CO2 environment and the current prevention and control methods for SC CO2 corrosion are reviewed. To begin, the supercritical CO2 corrosion environment and corrosion evaluation methods are introduced. Then, the effects of some factors, such as the water content, gaseous impurities, acids, alkalis, salts, temperature, pressure, flow rate, exposure angle, and pipeline steel, on corrosion are comprehensively reviewed. New research areas, such as the use of coatings and inhibitors, are also reviewed. Finally, future development directions for studying corrosion in a supercritical CO2 environment are proposed.