在模拟北京土壤溶液中，硝酸盐还原芽孢杆菌对 304 不锈钢的微生物影响腐蚀。
Microbiologically influenced corrosion of 304 stainless steel by nitrate reducing Bacillus cereus in simulated Beijing soil solution.
机构信息
Corrosion and Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China.
出版信息
Bioelectrochemistry. 2020 Jun;133:107477. doi: 10.1016/j.bioelechem.2020.107477. Epub 2020 Jan 31.
In this work, microbiologically influenced corrosion (MIC) of 304 stainless steel (SS) caused by Bacillus cereus was investigated by electrochemical measurements and surface analyses in simulated Beijing soil solution under aerobic condition. The nitrate-reducing bacterium (NRB), B. cereus, was isolated from Beijing soil and identified using 16S rDNA. Confocal laser scanning microscopy (CLSM) images showed that the largest pit depths on 304 SS with and without B. cereus after 14 days of incubation were 7.17 and 4.59 μm, respectively, indicating that pitting corrosion was accelerated by B. cereus. X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometry (EDS) results revealed that B. cereus and its metabolic products were detrimental to the integrity of the passive film on 304 SS. The electrochemical results showed that B. cereus significantly reduced the corrosion resistance of 304 SS and accelerated the anodic dissolution reaction, thereby speeding up the corrosion process.
本工作通过电化学测量和表面分析，研究了在有氧条件下，模拟北京土壤溶液中蜡状芽孢杆菌引起的 304 不锈钢的微生物影响腐蚀（MIC）。从北京土壤中分离出并通过 16S rDNA 鉴定出具有硝酸还原能力的细菌（NRB）蜡状芽孢杆菌。共聚焦激光扫描显微镜（CLSM）图像显示，在 14 天的孵育后，有和没有蜡状芽孢杆菌的 304 SS 的最大点蚀深度分别为 7.17 和 4.59 μm，表明蜡状芽孢杆菌加速了点蚀腐蚀。X 射线光电子能谱（XPS）和能谱（EDS）结果表明，蜡状芽孢杆菌及其代谢产物对 304 SS 上的钝化膜的完整性有害。电化学结果表明，蜡状芽孢杆菌显著降低了 304 SS 的耐腐蚀性并加速了阳极溶解反应，从而加速了腐蚀过程。
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