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Corrosion Behavior of Low-Alloy Pipeline Steel with 1% Cr Under CO2 Condition

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Carbon dioxide corrosion behavior of low-alloy pipeline steel with 1% Cr exposed to CO2-saturated solution was investigated by immersion experiment. SEM, EDX, TEM, EPMA and XRD were utilized to investigate the microstructure, corrosion morphologies, corrosion phases and elements distribution of corrosion scale. The results demonstrate that the microstructure of tested steel consists of ferrite and carbides. During the corrosion process, ferrite dissolves preferentially, leaving carbide particles behind. The residual carbide particles may promote the nucleation of FeCO3 crystal. The phase comprising of the inner layer is Cr compound, and the one of the outer layer is FeCO3. The formation process of corrosion scale can be illustrated as follows: Firstly, a thin scale consisting of thin inner layer and outer layer is formed, which represents poor corrosion resistance; then, the inner layer changes little, once it has been formed, and the outer layer becomes thick and compact, which demonstrates that a fine corrosion resistance is obtained. The chemical elements of chromium and molybdenum accumulate in the inner layer of corrosion scale. The corrosion behavior of low-alloy steel based on microstructure and morphology characterization is also discussed.

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Acknowledgments

This work was financially supported by National Key Technology Research and Development Program of the Ministry of Science and Technology of China during the “12th Five-Year Plan”(Grant No. 2011BAE25B03).

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Authors and Affiliations

  1. The State Key Lab of Rolling and Automation, Northeastern University, Shenyang, 110819, China

    Zhen-Guang Liu, Xiu-Hua Gao, Lin-Xiu Du & Jian-Ping Li

  2. School of Resource and Material, Northeastern University at Qinhuangdao, Qinhuangdao, 066100, China

    Chi Yu

  3. Mechanical and Electrical Engineering, Shijiazhuang Vocational College for Scientific and Technical Engineering, Shijiazhuang, 050800, China

    Ping-Ju Hao

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  1. Zhen-Guang Liu
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  2. Xiu-Hua Gao
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  3. Chi Yu
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Correspondence to Xiu-Hua Gao.

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Liu, ZG., Gao, XH., Yu, C. et al. Corrosion Behavior of Low-Alloy Pipeline Steel with 1% Cr Under CO2 Condition. Acta Metall. Sin. (Engl. Lett.) 28, 739–747 (2015). https://doi.org/10.1007/s40195-015-0255-3

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  • DOI: https://doi.org/10.1007/s40195-015-0255-3

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