Abstract
The cathodic reaction mechanisms in CO2 corrosion of low-Cr steels were investigated by potentiodynamic polarization and galvanostatic measurements. Distinct but different dominant cathodic reactions were observed at different pH levels. At the higher pH level (pH > ~5), H2CO3 reduction was the dominant cathodic reaction. The reaction was under activation control. At the lower pH level (pH < ~3.5), H+ reduction became the dominant one and the reaction was under diffusion control. In the intermediate area, there was a transition region leading from one cathodic reaction to another. The measured electrochemical impedance spectrum corresponded to the proposed cathodic reaction mechanisms.
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This work was financially supported by the National Natural Science Foundation of China (No. 51371034) and Fundamental Research Funds for the Central Universities (No. 06500118).
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Zhu, Jy., Xu, Ln., Lu, Mx. et al. Cathodic reaction mechanisms in CO2 corrosion of low-Cr steels. Int J Miner Metall Mater 26, 1405–1414 (2019). https://doi.org/10.1007/s12613-019-1861-2
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DOI: https://doi.org/10.1007/s12613-019-1861-2