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Effect of copper addition in carbon steel on biocorrosion by sulfate-reducing bacteria in solution

Haobo Yu (Beijing Key Laboratory of Failure, Corrosion and Protection of Oil/Gas Facility Materials, China University of Petroleum Beijing,Beijing, China)
Zimo Li (China University of Petroleum Beijing, Beijing, China)
Yeyin Xia (China University of Petroleum Beijing, Beijing, China)
Yameng Qi (Baoshan Iron and Steel Ltd, Shanghai, China)
Yingchao Li (China University of Petroleum Beijing, Beijing, China)
Qiaoping Liu (Chongqing Fuling Shale Gas Exploration and development Co., Ltd, Sinopec, Chongqing, China)
Changfeng Chen (Beijing Key Laboratory of Failure, Corrosion and Protection of Oil/Gas Facility Materials, China University of Petroleum Beijing,Beijing, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 26 July 2021

Issue publication date: 19 August 2021

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Abstract

Purpose

This paper aims to investigate the anti-biocorrosion performance and mechanism of the Cu-bearing carbon steel in the environment containing sulfate-reducing bacterial (SRB).

Design/methodology/approach

The biocorrosion behavior of specimens with Cu concentration of 0 Wt.%, 0.1 Wt.%, 0.3 Wt.% and 0.6 Wt.% were investigated by immersion test in SRB solution. By examining the prepared cross-section of the biofilm using focused ion beam microscopy, SRB distribution, bacterial morphology, biofilm structure and composition were determined. The ion selectivity of the biofilm was also obtained by membrane potential measurement. Moreover, the anti-biocorrosion performance of the Cu-bearing carbon steel pipeline was tested in a shale gas field in Chongqing, China.

Findings

Both the results of the laboratory test and shale gas field test indicate that Cu-bearing carbon steel possesses obvious resistance to microbiologically influenced corrosion (MIC). The SRB, corrosion rate and pitting depth decreased dramatically with Cu concentration in the substrate. The local acidification caused by hydrolyze of ferric ion coming from SRB metabolism and furtherly aggravated by anion selectivity biofilm promoted the pitting corrosion. Anti-biocorrosion of Cu-bearing carbon steel was attributed to the accumulation of Cu compounds in the biofilm and the weaker anion selectivity of the biofilm. This research results provide an approach to the development of economical antibacterial metallic material.

Originality/value

MIC occurs extensively and has become one of the most frequent reasons for corrosion-induced failure in the oil and gas industry. In this study, Cu-bearing carbon steel was obtained by Cu addition in carbon steel and possessed excellent anti-biocorrosion property both in the laboratory and shale gas field. This study provides an approach to the development of an economical antibacterial carbon steel pipeline to resist MIC.

Keywords

Citation

Yu, H., Li, Z., Xia, Y., Qi, Y., Li, Y., Liu, Q. and Chen, C. (2021), "Effect of copper addition in carbon steel on biocorrosion by sulfate-reducing bacteria in solution", Anti-Corrosion Methods and Materials, Vol. 68 No. 4, pp. 302-309. https://doi.org/10.1108/ACMM-12-2020-2417

Publisher

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Emerald Publishing Limited

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