Effects of CO2 gassy-supercritical phase transition on corrosion behaviors of carbon steels in saturated vapor environment

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Corrosion behaviors of P110 and N80 tubular steels in CO2 gas phase and supercritical (S-CO2) phase in a saturated water vapor environment were explored in corrosion weight loss experiments by SEM, EDS, XRD, XPS and cross-section analysis techniques. With the increase in CO2 partial pressure, the average corrosion rate increased first and then decreased. The average corrosion rate reached the maximum value under the near-critical pressure. When CO2 partial pressure further increased to be above the critical pressure, the average corrosion rate gradually decreased and local aggregation of molecules was weakened.