蜡状芽孢杆菌对北京土壤环境中 X80 管线钢的腐蚀作用。
Corrosion effect of Bacillus cereus on X80 pipeline steel in a Beijing soil environment.
机构信息
Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China.
Institute of Advanced Wear & Corrosion Resistant and Functional Materials, Jinan University, Guangzhou 510632, China.
出版信息
Bioelectrochemistry. 2018 Jun;121:18-26. doi: 10.1016/j.bioelechem.2017.12.011. Epub 2017 Dec 24.
The corrosion of X80 pipeline steel in the presence of Bacillus cereus (B. cereus) was studied through electrochemical and surface analyses and live/dead staining. Scanning electron microscopy and live/dead straining results showed that a number of B. cereus adhered to the X80 steel. Electrochemical impedance spectroscopy showed that B. cereus could accelerate the corrosion of X80 steel. In addition, surface morphology observations indicated that B. cereus could accelerate pitting corrosion in X80 steel. The depth of the largest pits due to B. cereus was approximately 11.23μm. Many pits were found on the U-shaped bents and cracks formed under stress after 60days of immersion in the presence of B. cereus. These indicate that pitting corrosion can be accelerated by B. cereus. X-ray photoelectron spectroscopy results revealed that NH existed on the surface of X80 steel. B. cereus is a type of nitrate-reducing bacteria and hence the corrosion mechanism of B. cereus may involve nitrate reduction on the X80 steel.
通过电化学和表面分析以及活菌/死菌染色研究了蜡状芽孢杆菌（Bacillus cereus，B. cereus）存在时 X80 管道钢的腐蚀情况。扫描电子显微镜和活菌/死菌染色结果表明，许多蜡状芽孢杆菌附着在 X80 钢上。电化学阻抗谱表明，蜡状芽孢杆菌可以加速 X80 钢的腐蚀。此外，表面形貌观察表明，蜡状芽孢杆菌可以加速 X80 钢的点蚀腐蚀。由于蜡状芽孢杆菌导致的最大蚀坑深度约为 11.23μm。在存在蜡状芽孢杆菌的情况下浸泡 60 天后，在 U 型弯曲处和应力下形成的裂纹处发现了许多蚀坑。这表明蜡状芽孢杆菌可以加速点蚀腐蚀。X 射线光电子能谱结果表明，X80 钢表面存在 NH。蜡状芽孢杆菌是一种硝酸盐还原菌，因此，蜡状芽孢杆菌的腐蚀机制可能涉及 X80 钢上的硝酸盐还原。
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