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首页> 外文期刊>International Journal of Electrochemical Science >Enhanced Corrosion of 7075 Alloy by the Presence of Bacillus megaterium
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Enhanced Corrosion of 7075 Alloy by the Presence of Bacillus megaterium

机译：巨大芽孢杆菌的存在增强了7075合金的腐蚀

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A Bacillus megaterium strain with corrosive properties was isolated from a bacterial communitycollected from the drain valve of a C130 aircraft principal fuel tank. This strain and the consortiumpresent in the valve were studied microbiologically and electrochemically to evaluate the risk ofcorrosion. Aluminum alloy 7075 was used as a substrate and the corrosion behavior was studied insterile minimal salt medium (MSM) as a function of immersion time. The isolation andcharacterization of the consortium by DNA sequencing showed that the bacterium with corrosiveproperties is closely related to B. megaterium. Electrochemical results revealed that the corrosion ratewas not influenced in sterile and inoculated media with the consortium. However, a corrosive behaviorwas determined in presence of the isolated B. megaterium strain after 14 days immersion time. The- effect might be related to interfacial local pH changes by oxygen reduction to OH ions. Further, SEMexaminations and EDX analysis of metallic samples exposure in inoculated media showed localizedattacks.
机译：从具有细菌性质的巨大芽孢杆菌菌株中分离出一种细菌，该细菌群落是从C130飞机主燃油箱的排放阀中收集的。对该阀门中存在的应变和团体进行了微生物和电化学研究，以评估其腐蚀风险。铝合金7075被用作基材，研究了腐蚀行为，以无菌最小盐介质（MSM）作为浸泡时间的函数。 DNA的分离和鉴定表明，具有腐蚀性的细菌与巨大芽孢杆菌密切相关。电化学结果表明，腐蚀速率在财团的无菌和接种介质中没有受到影响。然而，在浸没14天后，在分离出的巨大芽孢杆菌菌株的存在下确定了腐蚀行为。该作用可能与通过将氧气还原成OH离子而引起的界面局部pH值变化有关。此外，对接种介质中金属样品暴露的SEM检查和EDX分析表明存在局部攻击。

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