Abstract
This study investigates the impact of oxygen contamination on corrosion products formed during CO2 pre-corrosion of X70 and 3Cr steels. The results show that O2 promotes the generation of Fe2O3, γ-FeOOH and Fe3O4 and the degradation of original FeCO3, accelerating the corrosion process. The pores on the original surface and the hydrolysis of Cr(OH)3 lead the general corrosion rate of 3Cr steel to be much higher than that of X70 steel in the first 24 h. Cr’s self-repairing can mitigate the corrosion failure of 3Cr steel, and thus the general corrosion rate of 3Cr after 24 h is lower than that of X70. However, this self-repairing effect is quite less than the destructive effect of oxygen. Therefore, in the actual oil and gas production process, it is recommended to use deoxygenation treatment, anti-oxidation corrosion inhibitor and steel with high chromium content.
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