Abstract
For a better understanding of the pitting corrosion mechanism of 13Cr steel in a supercritical (SC) CO2–H2O environment with flue gas impurities, experiments were conducted with different exposure time with and without rotation and Cl–. The results show that the corrosion products formed in CO2 phase and water phase varied in morphologies and compositions. The corrosion scale in CO2 phase mainly consisted of amorphous FeCO3 while the corrosion scale in water phase was mainly made up of crystalline FeCO3. Pitting corrosion was the predominant corrosion type in supercritical CO2 with flue gas impurities and it was more severe in CO2 phase than that in water phase. No pitting corrosion occurred in both CO2 and water phase with the presence of flow. Cl– enhanced uniform corrosion in both phases and had ability to break down corrosion products. Secondary localized corrosion could be observed at the boundary of pit holes.
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