Influence of initial pH and sulfate-reducing bacteria concentration on the microbiologically influenced corrosion of buried pipeline steel

IF 1.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials and Corrosion-werkstoffe Und Korrosion Pub Date : 2024-03-31 DOI:10.1002/maco.202414320

Wenhui Liu, Wuxi Bi, Yabo Hu, Wenqi Lu, Wenhao Feng, Yipei Wang, Yuheng Li, Jianhua Liu

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Abstract

Microbiologically influenced corrosion (MIC) caused by sulfate-reducing bacteria (SRB) is a major threat to buried pipelines. The crevices beneath disbonded coatings provide the environment for the survival and growth of SRB, accelerating the attachment of SRB and significantly reducing the effectiveness of buried pipelines. In this work, the influence of initial pH values (6.4, 8.0) and SRB concentrations (2.0 × 10¹, 4.5 × 10², 2.5 × 10³ cells/mL) were investigated on the behaviors of L415 carbon steel. The results indicated that the overall uniform corrosion rate of L415 carbon steel decreased while the maximum pitting corrosion rate exhibited an increasing trend with the increasing of initial concentration of SRB. In comparison to the pH 6.4 environment, the overall risk of pitting corrosion in pH 8.0 environment was reduced due to the biomineralization of SRB, enhancing the protection of metal materials.

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初始 pH 值和硫酸盐还原菌浓度对埋地管道钢材微生物腐蚀的影响

由硫酸盐还原菌（SRB）引起的微生物腐蚀（MIC）是埋地管道的一大威胁。脱粘涂层下的缝隙为 SRB 的生存和生长提供了环境，加速了 SRB 的附着，大大降低了埋地管道的有效性。在这项工作中，研究了初始 pH 值（6.4、8.0）和 SRB 浓度（2.0 × 101、4.5 × 102、2.5 × 103 cells/mL）对 L415 碳钢行为的影响。结果表明，随着 SRB 初始浓度的增加，L415 碳钢的整体均匀腐蚀速率下降，而最大点蚀速率呈上升趋势。与 pH 值为 6.4 的环境相比，在 pH 值为 8.0 的环境中，由于 SRB 的生物矿化作用，点腐蚀的总体风险降低了，从而增强了对金属材料的保护。

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来源期刊

Materials and Corrosion-werkstoffe Und Korrosion 工程技术-材料科学：综合

CiteScore

3.70

自引率

11.10%

发文量

199

审稿时长

1.4 months

期刊介绍： Materials and Corrosion is the leading European journal in its field, providing rapid and comprehensive coverage of the subject and specifically highlighting the increasing importance of corrosion research and prevention. Several sections exclusive to Materials and Corrosion bring you closer to the current events in the field of corrosion research and add to the impact this journal can make on your work.

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