Effect of E. coli biofilm formation and removal on passive films on AISI 316L during fermentation processes

Monica Santamaria, Giulio Ghersi, Giada Tranchida, Francesco Di Franco, Sannakaisa Virtanen, Davide Pupillo

Research output: Contribution to journalArticlepeer-review

Abstract

316L coupons were sanitized in hot water vapour inducing iron enrichment in passive films. Coupons were then immersed in a pilot fed-batch fermenter in presence of E. coli. Sanitization causes iron enrichment in passive films. Fermentation causes the growth of biofilm on the SS, constituted by bacteria embedded in an extracellular polymeric substance. During fermentation SS open circuit potential is very negative due to low oxygen concentration on its surface, while the chelating action of siderophores induces chromium enrichment in the passive film. Disinfection in NaClO for 30 min allows removal of biofilm and formation of a protective passive film.
Original languageEnglish
Number of pages10
JournalCorrosion Science
Volume185
Publication statusPublished - 2021

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering
  • General Materials Science

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