Corrosion Behavior of X65 Steel by Sulphate Reducing Bacteria (SRB) in Acetic Acid Environment

HE Tingting; FENG Yi; YAN Huayun; WANG Maomao; YU Haitao; CHEN Yingfeng; LU Kejie

doi:10.7643/ issn.1672-9242.2025.09.015

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (9) : 138-146. DOI: 10.7643/ issn.1672-9242.2025.09.015

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Corrosion Behavior of X65 Steel by Sulphate Reducing Bacteria (SRB) in Acetic Acid Environment

HE Tingting¹, FENG Yi^2,*, YAN Huayun¹, WANG Maomao², YU Haitao¹, CHEN Yingfeng², LU Kejie¹

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Abstract

The work aims to study the growth pattern of SRB in different acetic acid concentration media and the effect of SRB on the corrosion behavior of X65 steel in different acetic acid environments. The study was conducted by electrochemical tests, static immersion corrosion tests and surface morphology analysis. The results showed that the concentration of SRB was significantly higher in the acetic acid-containing system than in the acetic acid-free system, and the growth process could be divided into a rapid growth period (0 d-7 d) and a decline period (7 d-14 d). In the acetic acid-free system, the X65 steel mainly underwent uniform corrosion, with a uniform corrosion rate ranged from 0.204 mm/a to 0.225 mm/a, and the corrosion product was Fe₃O₄. In the acetic acid-containing system, local corrosion pits were formed on the sample surface, with rod-shaped SRB bacteria visible inside the pits. The corrosion products were Fe₃O₄ and FeS, and the local corrosion rate ranged from 0.365 mm/a to1.564 mm/a, while the uniform corrosion rate ranged from 0.046 mm/a to 0.068 mm/a. With the prolongation of immersion time, the electrochemical corrosion rate and local corrosion rate showed a decreasing trend. The addition of acetic acid significantly increases the concentration of SRB, a large number of SRB attach to the surface of X65 steel, its metabolic process, metabolic products and corrosion product film together lead to significant changes in the corrosion mechanism. The uniform corrosion tendency is reduced, but the risk of local corrosion increases significantly.

Key words

acetic acid / sulphate-reducing bacteria (SRB) / microbiological corrosion / corrosion behavior / local corrosion / X65 steel

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HE Tingting, FENG Yi, YAN Huayun, WANG Maomao, YU Haitao, CHEN Yingfeng, LU Kejie. Corrosion Behavior of X65 Steel by Sulphate Reducing Bacteria (SRB) in Acetic Acid Environment[J]. Equipment Environmental Engineering. 2025, 22(9): 138-146 https://doi.org/10.7643/ issn.1672-9242.2025.09.015

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