Research Progress on Major Influencing Factors of Corrosion Behavior of Pipeline Steel in Supercritical CO2 Environment
Zhe Liu, Qian Gao, Yong Zhou, Ruijuan Pan
Abstract
Carbon capture, utilization and storage (CCUS) represents a vital technological strategy for mitigating greenhouse gas emissions and facilitating sustainable development. Supercritical CO2 (SC-CO2) pipeline transportation serves as an essential intermediary step towards attaining the “Dual Carbon Goals” and CCUS, representing the optimal and most cost-effective solution for ultra-long distance transport. In the CO2 capture process, trace amounts of impurities, such as H2O, O2, H2S, NOx and SOx, are inevitable. These gases react to form acidic compounds, thereby accelerating pipeline corrosion. With the progression of CCUS initiatives, corrosion within supercritical CO2 pipeline transportation has become a critical challenge that significantly affects the safety and integrity of pipeline infrastructure. This review paper provides an in-depth analysis of the corrosion behavior of pipeline materials in a supercritical CO2 environment, with particular attention to the effects of impurity, temperature, and pressure on corrosion rates, corrosion products, and corrosion morphology. Furthermore, an analysis of the corrosive behavior of welded joints in supercritical CO2 transport pipelines is performed to provide valuable reference data for research and construction projects related to these pipelines.