2016/10/30 by Minghe Xu, Qian Zhang, Zhe Wang +2
Engineering · Environmental Science · Materials Science · #CO2 Sequestration and Geologic Interactions #Concrete and Cement Materials Research #Corrosion Behavior and Inhibition
paper · doi:10.5006/2175
crossref issued 2016/10/30 · crossref published 2016/10/30 · crossref published-online 2016/10/30 · openalex publication_date 2016/10/30 · crossref created 2016/10/30 · openalex created_date 2016/11/04 · crossref published-print 2017/03/01 · crossref deposited 2025/06/11 · crossref indexed 2026/07/30 · openalex updated_date 2026/07/30
In the context of carbon capture and storage systems, the pipeline steel utilized to transport supercritical CO2 usually encounters corrosion if impurities such as O2 and H2O are present. This study filled the knowledge gap in understanding the effect of O2 on carbon steel corrosion behavior in water-saturated and water-unsaturated supercritical CO2 phase with SO2 as an acid gas impurity by systematically identifying the general and localized corrosion behavior of X70 steel exposed to supercritical CO2 with SO2, varying relative water contents of 45% to 100% and O2 concentrations of 0.1 mol% to 2.0 mol% at 50°C and 10 MPa. Weight loss method, scanning electron microscopy, x-ray diffraction, and 3D measuring laser microscopy were used to analyze the corrosion behavior. General corrosion rates of X70 steel exposed to 0.1 mol% and 1.0 mol% O2 increased from 0.03 mm/y to 1.61 mm/y with relative water content rising from 45% to 100%. High O2 concentrations exerted no influence on uniform corrosion rates at a relative water content of 45%, enhanced the general corrosion at a relative water content of 50% to 60% and localized corrosion at a relative water content of 50% to 88%, but decreased the general corrosion at a relative water content of 75% to 100% and localized corrosion at a relative water content of 100%.