Journal
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
Volume 72, Issue 6, Pages 983-994Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/maco.202012192
Keywords
biofilms; flavins; MIC; microbially influenced corrosion; XANES
Funding
- Projekt DEAL
Ask authors/readers for more resources
The presence of minute amounts of flavins promotes biofilm formation and provides protective effect against pitting corrosion on stainless steel surfaces, indicating changes in passive film chemistry can alter susceptibility of stainless steel surfaces to microbially influenced corrosion.
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available