The role of O2 in CO2 corrosion and erosion-corrosion was investigated using high temperature and high pressure autoclaves, more research methods of material surface such as SEM, XRD, and EDS etc. were used. The results suggested that under static conditions, the corrosion morphology of pure CO2 was uniform corrosion, and when O2 was added, it translated into pitting corrosion and the corrosion rate increased. Fe2O3, Fe3O4, and FeCO3 were the main corrosion products in CO2-O2 environments. The potentiodynamic sweeps results showed that when O2 was added, the corrosion potential increased by 41mV vs. Ag/AgCl and the corrosion current density increased by 300%. When the flow velocity increased to 2 m/s, the corrosion rate of the two corrosive environments both had a significant increase. Moreover, when sands were also added, the CO2-O2 erosion-corrosion rate with sands was remarkably increased, which indicated that the presence of O2 made the synergy of corrosion and erosion largely enhanced.

Subject
Pits, Steel surfaces, Materials, Sand, Corrosion rate, Flow velocity, Corrosion products, Corrosion scales, Erosion, Steel, Environments, Oxygen, Erosion corrosion
Keywords:
CO2-O2, Corrosion, Erosion-corrosion, Synergy, N80 steel
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2014
Association for Materials Protection and Performance (AMPP)
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