Salgar-Chaparro Silvia J, Tarazona Johanna, Machuca Laura L
Curtin Corrosion Centre, WA School of Mines, Minerals, Energy and Chemical Engineering, Curtin University, Perth, WA, Australia.
Front Bioeng Biotechnol. 2022 Mar 10;10:825776. doi: 10.3389/fbioe.2022.825776. eCollection 2022.
DC57 is a bacterial strain isolated from a corrosion failure in a floating oil production system. Previous studies have indicated that this microorganism has potential to trigger corrosion of carbon steel through several metabolic pathways identified in its genome. In this study we evaluated the corrosion of carbon steel by in the presence of thiosulphate or nitrate as terminal electron acceptors of the anaerobic respiration. Electrochemical response of carbon steel to the biofilm formation revealed differences in the corrosion process under the different electron acceptors conditions. Microscopic examination of the metal surface confirmed that induced corrosion in both scenarios; however, in the presence of thiosulfate triggered a higher pitting corrosion rate, whereas in presence of nitrate it promoted higher uniform corrosion. This study demonstrates the importance of understanding the metabolic versatility of microbes in order to assess the MIC risk of industrial facilities.
DC57是从一个浮式采油系统的腐蚀失效处分离出的一种细菌菌株。先前的研究表明，这种微生物有可能通过其基因组中确定的几种代谢途径引发碳钢腐蚀。在本研究中，我们评估了在存在硫代硫酸盐或硝酸盐作为厌氧呼吸的终端电子受体的情况下，DC57对碳钢的腐蚀情况。碳钢对生物膜形成的电化学响应揭示了在不同电子受体条件下腐蚀过程的差异。对金属表面的显微镜检查证实，在两种情况下DC57都会引发腐蚀；然而，在硫代硫酸盐存在的情况下，DC57引发更高的点蚀速率，而在硝酸盐存在的情况下，它促进更高的均匀腐蚀。本研究证明了了解微生物的代谢多样性对于评估工业设施的微生物腐蚀风险的重要性。
