Abstract
The trace dissolved oxygen has a dual role in corrosion of 3Cr steel in CO2 aqueous environment, and the content determines which role is dominant. The corrosion rate in CO2-2.15 ppm O2 environment is lower than that in pure CO2 environment. However, it dramatically reaches 3.184 mm/y when the O2 content is 6.32 ppm. The corrosion scale possesses a single Cr-rich layer in CO2 environment, while that in CO2-2.15 ppm O2 environment consists of a Cr-rich inner layer, a Cr-Fe mixed middle layer, and a porous outer layer. When the O2 content is low, O2 promotes the dissolution of Cr and the formation of Cr(OH)3, resulting in the increase of Cr-rich layer thickness and the decrease of corrosion rate. Besides, there is not enough O2 to completely oxidize Fe2+ to Fe3+, thus protecting the integrity of the inner film composed of Cr(OH)3 and FeCO3. When the O2 content increases to 6.32 ppm, Fe3+ compounds, and Cr(OH)3 compete for deposition on the surface. O2 promotes the formation of Fe3+ compounds, causing Fe3+ compounds to occupy the position of Cr(OH)3 in the inner film and Cr compounds are isolated. Then the uneven distribution of Cr element in the inner film results in significant pitting corrosion.
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The authors are grateful to the National Natural Science Foundation of China (51571027) and the funding support from the National Key R&D Program of China (2016YFE0203600).
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Chen, L., Liu, W., Dong, B. et al. Role of Trace Dissolved Oxygen Content in Corrosion Scale of 3Cr Steel in CO2 Aqueous Environment. J. of Materi Eng and Perform 31, 4864–4876 (2022). https://doi.org/10.1007/s11665-021-06556-9
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DOI: https://doi.org/10.1007/s11665-021-06556-9