Sulfate reducing bacteria corrosion of a 90/10 Cu-Ni alloy coupled to an Al sacrificial anode.

IF 4.8 2区化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY

Bioelectrochemistry Pub Date : 2024-12-26 DOI:10.1016/j.bioelechem.2024.108892

Huixuan Qian, Tianguan Wang, Peng Xu, Zhiyuan Feng, Bing Lei, Ping Zhang, Honglei Guo, Guozhe Meng

引用次数: 0

Abstract

This study investigates the corrosion of 90/10 copper-nickel (Cu-Ni) alloy caused by sulfate-reducing bacteria (SRB) in the presence of aluminum anodes, with particular emphasis on the role of electron supply in microbial corrosion and the resulting local corrosion failures. The study reveals that the electron supply from the anode supports SRB growth on the Cu-Ni alloy through an "Electrons-siphoning" mechanism. However, the supply is insufficient to sustain the SRB population, resulting in ineffective cathodic protection (i_corr = 2.34 × 10^-6 A cm^-2). The addition of 20 ppm riboflavin (RF) to the SRB biofilm enhances electrical activity and increases the electron donor density, thereby restoring the anode's protective effect. As a result, the i_corr of the 90/10 Cu-Ni alloy decreases by an order of magnitude (to 3.5 × 10^-7 A cm^-2). These findings provide valuable new insights into the mechanisms of microbial corrosion.

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90/10 Cu-Ni合金与Al牺牲阳极的硫酸盐还原细菌腐蚀。

本研究研究了在铝阳极存在的情况下，硫酸盐还原菌（SRB）对90/10铜镍（Cu-Ni）合金的腐蚀，特别强调了电子供应在微生物腐蚀中的作用以及由此导致的局部腐蚀失效。研究表明，阳极的电子供给通过“电子虹吸”机制支持SRB在Cu-Ni合金上的生长。然而，供应不足以维持SRB种群，导致无效的阴极保护（icorr = 2.34 × 10-6 A cm-2）。在SRB生物膜中加入20ppm的核黄素（RF）可以增强电活性，增加电子供体密度，从而恢复阳极的保护作用。因此，90/10 Cu-Ni合金的icorr降低了一个数量级（为3.5 × 10-7 a cm-2）。这些发现为微生物腐蚀的机理提供了有价值的新见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.