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Volume 19
Issue 22
10.3390/ijerph192215416
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Article

Microbiologically Influenced Corrosion of Q235 Carbon Steel by Ectothiorhodospira sp.

by
Hong Qi
,
Yingsi Wang
,
Jin Feng
,
Ruqun Peng
,
Qingshan Shi
* and
Xiaobao Xie
*
Key Laboratory of Agricultural Microbiomics and Precision Application (MARA), Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Key Laboratory of Agricultural Microbiome (MARA), State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
*
Authors to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2022, 19(22), 15416; https://doi.org/10.3390/ijerph192215416
Submission received: 10 October 2022 / Revised: 10 November 2022 / Accepted: 18 November 2022 / Published: 21 November 2022
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Abstract

The biological sulfur cycle is closely related to iron corrosion in the natural environment. The effect of the sulfur-oxidising bacterium Ectothiorhodospira sp., named PHS-Q, on the metal corrosion behaviour rarely has been investigated. In this study, the corrosion mechanism of Q235 carbon steel in a PHS-Q-inoculated medium is discussed via the characterization of the morphology and the composition of the corrosion products, the measurement of local corrosion and the investigation of its electrochemical behaviour. The results suggested that, initially, PHS-Q assimilates sulfate to produce H2S directly or indirectly in the medium without sulfide. H2S reacts with Fe2+ to form an inert film on the coupon surface. Then, in localised areas, bacteria adhere to the reaction product and use the oxidation of FeS as a hydrogen donor. This process leads to a large cathode and a small anode, which incurs pitting corrosion. Consequently, the effect of PHS-Q on carbon steel corrosion behaviour is crucial in an anaerobic environment.
Keywords: corrosion; steel; pitting; electrochemistry; Ectothiorhodospira sp. corrosion; steel; pitting; electrochemistry; Ectothiorhodospira sp.
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MDPI and ACS Style

Qi, H.; Wang, Y.; Feng, J.; Peng, R.; Shi, Q.; Xie, X. Microbiologically Influenced Corrosion of Q235 Carbon Steel by Ectothiorhodospira sp. Int. J. Environ. Res. Public Health 2022, 19, 15416. https://doi.org/10.3390/ijerph192215416

AMA Style

Qi H, Wang Y, Feng J, Peng R, Shi Q, Xie X. Microbiologically Influenced Corrosion of Q235 Carbon Steel by Ectothiorhodospira sp. International Journal of Environmental Research and Public Health. 2022; 19(22):15416. https://doi.org/10.3390/ijerph192215416

Chicago/Turabian Style

Qi, Hong, Yingsi Wang, Jin Feng, Ruqun Peng, Qingshan Shi, and Xiaobao Xie. 2022. "Microbiologically Influenced Corrosion of Q235 Carbon Steel by Ectothiorhodospira sp." International Journal of Environmental Research and Public Health 19, no. 22: 15416. https://doi.org/10.3390/ijerph192215416

APA Style

Qi, H., Wang, Y., Feng, J., Peng, R., Shi, Q., & Xie, X. (2022). Microbiologically Influenced Corrosion of Q235 Carbon Steel by Ectothiorhodospira sp. International Journal of Environmental Research and Public Health, 19(22), 15416. https://doi.org/10.3390/ijerph192215416

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