Session: Corrosion in Carbon Capture, Transportation, and Utilization and Storage (CCTUS) (Part I of III)
Corrosion Behavior of X-Series Pipeline Steels in Water-Saturated s-CO₂: Effects of Flow and Gas Impurities (C2026-00372)
Wednesday, March 18, 2026
11:00 AM - 11:30 AM Central
Location: 342 DE
Earn .5 PDH
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Muhammad Rashid, Alexander Gross, Haofei Sun, Greg Lehnhoff
The successful deployment of carbon capture, utilization, and storage (CCUS critically depends on the safe and reliable operation of CO2 pipeline systems, particularly under conditions involving supercritical CO2 (s-CO2) containing gas impurities. This study investigates the corrosion behavior of four candidate X‑series pipeline steels, including X65-1, X65-2, X70, and X80, exposed to water-saturated s-CO2 at 10 MPa and 50 °C for 100 hours of exposure. Two key environmental variables were examined: flow condition (static vs. 600 rpm/~1m/s) and gas composition (water-saturated s-CO2vs. s-CO2 containing 200 ppm SO₂ + 1000 ppm O₂). The results show distinct differences in corrosion sensitivity among the steels. Under flow conditions, X70 and X80 exhibit significantly elevated corrosion rates (0.11 and 0.09 mm/yr, respectively), approximately four times higher than under static conditions (around 0.03 mm/yr). In contrast, both X65 steels demonstrate less sensitivity to flow, with corrosion rates between 0.06-0.09 mm/yr under both static and flow conditions. The presence of SO₂ and O₂ impurities under static conditions increased corrosion rates by approximately 20-fold for all steels. Surface analyses using SEM and XRD identified Fe3O4and FeCO3 as primary corrosion products in water-saturated s-CO2, while FeS2 and FeS formed in the presence of SO₂ and O₂.
