The corrosion mechanism of Q355 steel electrically connected to the Al-Zn-In-Cd sacrificial anode: From microbial community to corrosion behavior analysis

IF 4.8 2区化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY

Bioelectrochemistry Pub Date : 2025-04-25 DOI:10.1016/j.bioelechem.2025.108990

Lina Zhang , Fang Guan , Tianrong Zhan , Keliang Fan , Yugang Sang , Xiaodaong Zhao , Xiaofan Zhai , Jizhou Duan

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Abstract

Microbially induced corrosion caused by sulfate-reducing bacteria (SRB) poses a significant threat to marine engineering facilities. Cathodic protection technology is a widely used method to prevent the corrosion of buried pipelines. The applied cathodic potential not only induce corrosion behavior change of steel but also triggers changes in the dominant microorganisms. In this study the corrosion behavior and microbial community characteristics of Q355 steel electrically connected to the Al-Zn-In-Cd sacrificial anode were studied. It was found that cathodic protection efficiency of Al-Zn-In-Cd alloy coupons with respect to Q355 steel in SRB media reached 40.17 %, while in natural seawater, the cathodic protection efficiency achieving a remarkable CP efficiency of 99.21 %. Besides of lepidocrocite (γ-FeOOH), halite, magnetite and Fe_1-xS, more quartz was formed on cathodic protection protected steel surfaces compared with that without protection. Besides, more electroactive bacteria like Exiguobacterium, were found on the cathodic protection protected steel surfaces, which is related to the higher electron density and a polarized electric field.

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电连接Al-Zn-In-Cd牺牲阳极的Q355钢腐蚀机理：从微生物群落到腐蚀行为分析

硫酸盐还原菌（SRB）引起的微生物腐蚀对海洋工程设施构成了重大威胁。阴极保护技术是防止埋地管道腐蚀的一种广泛应用的方法。外加阴极电位不仅引起钢的腐蚀行为改变，而且引起优势微生物的变化。研究了电连接Al-Zn-In-Cd牺牲阳极后Q355钢的腐蚀行为和微生物群落特征。结果表明，在SRB介质中，Al-Zn-In-Cd合金对Q355钢的阴极保护效率达到40.17%，而在天然海水中，阴极保护效率达到99.21%。在阴极保护钢表面，除鳞片石（γ-FeOOH）、卤石、磁铁矿和Fe1-xS外，石英的形成比无阴极保护钢表面多。此外，在阴极保护钢表面发现了更多的电活性细菌，如Exiguobacterium，这与较高的电子密度和极化电场有关。

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来源期刊

Bioelectrochemistry 生物-电化学

CiteScore

9.10

自引率

6.00%

发文量

238

审稿时长

38 days

期刊介绍： An International Journal Devoted to Electrochemical Aspects of Biology and Biological Aspects of Electrochemistry Bioelectrochemistry is an international journal devoted to electrochemical principles in biology and biological aspects of electrochemistry. It publishes experimental and theoretical papers dealing with the electrochemical aspects of: • Electrified interfaces (electric double layers, adsorption, electron transfer, protein electrochemistry, basic principles of biosensors, biosensor interfaces and bio-nanosensor design and construction. • Electric and magnetic field effects (field-dependent processes, field interactions with molecules, intramolecular field effects, sensory systems for electric and magnetic fields, molecular and cellular mechanisms) • Bioenergetics and signal transduction (energy conversion, photosynthetic and visual membranes) • Biomembranes and model membranes (thermodynamics and mechanics, membrane transport, electroporation, fusion and insertion) • Electrochemical applications in medicine and biotechnology (drug delivery and gene transfer to cells and tissues, iontophoresis, skin electroporation, injury and repair). • Organization and use of arrays in-vitro and in-vivo, including as part of feedback control. • Electrochemical interrogation of biofilms as generated by microorganisms and tissue reaction associated with medical implants.