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Corrosion of Q235 carbon steel induced by sulfate-reducing bacteria in groundwater: corrosion behavior, corrosion product, and microbial community structure

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Abstract

Microbiologically influenced corrosion (MIC) is one of the reasons leading to the service failure of pipelines buried in the soil. In this work, the effect of sulfate-reducing bacteria (SRB) on the corrosion behavior of Q235 carbon steel in groundwater was investigated by electrochemical methods, surface analysis, and biological analysis. The results show that SRB utilizes iron as electron donor to sustain the vital activities of organic carbon-starved groundwater during the 14-day experimental period. The microbial community composition analysis at the genus level demonstrate that the diversity and richness decrease after corrosion, and the dominant SRB species has changed from Desulfovibrio to Desulfosporosinus. Moreover, the impedance of the carbon steel in the presence of biofilm was 1 order of magnitude higher than that of other periods in the electrochemical test, indicating that the biofilm and formed ferrous sulfide layer impeded the occurrence of corrosion. Although the 3D topography indicated that the surface of carbon steel was more uneven and pits were increased in the presence of SRB, the average weight loss (0.0396 ± 0.0050 g) was much higher than that without SRB (0.0139 ± 0.0007 g). These results implied that the growth of SRB makes the corrosion process of Q235 carbon steel more complicated.

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Funding

This work was financially supported by the Project of Shandong Province Higher Educational Young Innovative Talent Introduction and Cultivation Team (Wastewater Treatment and Resource Innovation Team).

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Wenxin Hua: writing — original draft; methodology; writing — review and editing. Rui Sun: data curation, writing — original draft. Xiaoyan Wang: investigation. Yunyun Zhang: software. Jiaxing Li: formal analysis. Ri Qiu: visualization, supervision. Yu Gao: validation, resources, project administration, supervision. All authors read and approved the final manuscript.

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Correspondence to Yu Gao.

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Hua, ., Sun, R., Wang, X. et al. Corrosion of Q235 carbon steel induced by sulfate-reducing bacteria in groundwater: corrosion behavior, corrosion product, and microbial community structure. Environ Sci Pollut Res 31, 4269–4279 (2024). https://doi.org/10.1007/s11356-023-31422-7

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  • DOI: https://doi.org/10.1007/s11356-023-31422-7

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