Premium
Preconditioning of AISI 304 stainless steel surfaces in the presence of flavins—Part II: Effect on biofilm formation and microbially influenced corrosion processes
Author(s) -
Wurzler Nina,
Schutter Jan D.,
Wagner Ralph,
Dimper Matthias,
Hodoroaba VasileDan,
LützenkirchenHecht Dirk,
Ozcan Ozlem
Publication year - 2021
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.202012192
Subject(s) - corrosion , biofilm , flavin group , shewanella putrefaciens , pitting corrosion , metallurgy , materials science , xanes , chemistry , crevice corrosion , chemical engineering , bacteria , biochemistry , genetics , physics , quantum mechanics , spectroscopy , engineering , biology , enzyme
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.