Cathodic reaction mechanisms in CO<sub>2</sub> corrosion of low-Cr steels

Jin-yang Zhu; Li-ning Xu; Min-xu Lu; Wei Chang

doi:10.1007/s12613-019-1861-2

Volume 26 Issue 11

Nov. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(11): 1405-1414

Jin-yang Zhu, Li-ning Xu, Min-xu Lu, and Wei Chang, Cathodic reaction mechanisms in CO₂ corrosion of low-Cr steels, Int. J. Miner. Metall. Mater., 26(2019), No. 11, pp. 1405-1414. https://doi.org/10.1007/s12613-019-1861-2

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Jin-yang Zhu, Li-ning Xu, Min-xu Lu, and Wei Chang, Cathodic reaction mechanisms in CO2 corrosion of low-Cr steels, Int. J. Miner. Metall. Mater., 26(2019), No. 11, pp. 1405-1414. https://doi.org/10.1007/s12613-019-1861-2

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Research Article

Cathodic reaction mechanisms in CO₂ corrosion of low-Cr steels

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Corresponding author:
Jin-yang Zhu E-mail: zhujinyang@ustb.edu.cn
Received: 15 January 2019; Revised: 5 May 2019; Accepted: 2 June 2019

Abstract

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.
- low alloy steel;
- carbon dioxide corrosion;
- EIS;
- cathodic reaction;
- mechanisms

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