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Volume 26 Issue 11
Nov.  2019
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文章导航 >  矿物冶金与材料学报（英文）  > 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
Cite this article as:
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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研究论文

Cathodic reaction mechanisms in CO2 corrosion of low-Cr steels

  • National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China

  • Corrosion and Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

  • CNOOC Research Institute, Beijing 100027, China

  • 通讯作者:

    Jin-yang Zhu    E-mail: zhujinyang@ustb.edu.cn

  • 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.
    • Research Article

    Cathodic reaction mechanisms in CO2 corrosion of low-Cr steels

    + Author Affiliations
      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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