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Preconditioning of AISI 304 stainless steel surfaces in the presence of flavins—Part II: Effect on biofilm formation and microbially influenced corrosion processes
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-12-08 , DOI: 10.1002/maco.202012192 Nina Wurzler 1 , Jan D. Schutter 1 , Ralph Wagner 2 , Matthias Dimper 1 , Vasile‐Dan Hodoroaba 1 , Dirk Lützenkirchen‐Hecht 2 , Ozlem Ozcan 1
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-12-08 , DOI: 10.1002/maco.202012192 Nina Wurzler 1 , Jan D. Schutter 1 , Ralph Wagner 2 , Matthias Dimper 1 , Vasile‐Dan Hodoroaba 1 , Dirk Lützenkirchen‐Hecht 2 , Ozlem Ozcan 1
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Biofilm formation and microbially influenced corrosion of the iron-reducing microorganism Shewanella putrefaciens were investigated on stainless steel surfaces preconditioned in the absence and presence of flavin molecules by means of XANES (X-ray absorption near-edge structure) analysis and electrochemical methods. The results indicate that biofilm formation was promoted on samples preconditioned in electrolytes containing minute amounts of flavins. On the basis of the XANES results, the corrosion processes are controlled by the iron-rich outer layer of the passive film. Biofilm formation resulted in a cathodic shift of the open circuit potential and a protective effect in terms of pitting corrosion. The samples preconditioned in the absence of flavins have shown delayed pitting and the samples preconditioned in the presence of flavins did not show any pitting in a window of −0.3- to +0.0-V overpotential in the bacterial medium. The results indicate that changes in the passive film chemistry induced by the presence of minute amounts of flavins during a mild anodic polarization can change the susceptibility of stainless steel surfaces to microbially influenced corrosion.
中文翻译：
在黄素存在下预处理 AISI 304 不锈钢表面——第二部分：对生物膜形成和微生物影响腐蚀过程的影响
铁还原微生物Shewanella putrefaciens 的生物膜形成和微生物影响的腐蚀通过 XANES（X 射线吸收近边缘结构）分析和电化学方法在不存在和存在黄素分子的情况下预处理的不锈钢表面上进行了研究。结果表明，在含有微量黄素的电解质中预处理的样品促进了生物膜的形成。根据 XANES 结果，腐蚀过程由钝化膜的富铁外层控制。生物膜的形成导致开路电位的阴极偏移和点腐蚀方面的保护作用。在没有黄素的情况下预处理的样品显示出延迟的点蚀，而在存在黄素的情况下预处理的样品在细菌培养基中 -0.3- 至 +0.0-V 过电位的窗口中没有显示任何点蚀。
更新日期：2020-12-08
中文翻译：
在黄素存在下预处理 AISI 304 不锈钢表面——第二部分：对生物膜形成和微生物影响腐蚀过程的影响
铁还原微生物Shewanella putrefaciens 的生物膜形成和微生物影响的腐蚀通过 XANES（X 射线吸收近边缘结构）分析和电化学方法在不存在和存在黄素分子的情况下预处理的不锈钢表面上进行了研究。结果表明，在含有微量黄素的电解质中预处理的样品促进了生物膜的形成。根据 XANES 结果，腐蚀过程由钝化膜的富铁外层控制。生物膜的形成导致开路电位的阴极偏移和点腐蚀方面的保护作用。在没有黄素的情况下预处理的样品显示出延迟的点蚀，而在存在黄素的情况下预处理的样品在细菌培养基中 -0.3- 至 +0.0-V 过电位的窗口中没有显示任何点蚀。
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