The influence of bacteria on the passive film stability of 304 stainless steel

Kh M. Ismail, A. Jayaraman, Thomas Keith Wood, J. C. Earthman

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

The stability of stainless steel 304 in the presence of aerobic and anaerobic bacteria was investigated in a continuous flow system using electrochemical impedance spectroscopy and scanning electron microscopy (SEM) examinations. The results show that the open circuit potential (OCP) of stainless steel was ennobled (shifted in the electropositive direction) by about + 150 mV in the presence of the aerobic bacteria. The observed change of OCP in the electropositive direction can be explained by an increase in the rate of the cathodic reaction. Also the presence of an aerobic biofilm led to a decrease in the polarization resistance of stainless steel is not only due to the growth of micropits, as shown from SEM micrographs, but also due to thinning of the passive film. In the presence of only Pseudomonas fragi, the electrochemical impedance response showed a capacitive behavior with RP on the order of 500 kΩ. The addition of anaerobic sulfate reducing bacteria (SRB) to the test medium decreased RP to 12 kΩ due to an increase in localized corrosion, as indicated by SEM examination.

Original languageEnglish (US)
Pages (from-to)4685-4692
Number of pages8
JournalElectrochimica Acta
Volume44
Issue number26
DOIs
StatePublished - Sep 15 1999

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Stainless Steel
Bacteria
Stainless steel
Scanning electron microscopy
Aerobic bacteria
Networks (circuits)
Biofilms
Electrochemical impedance spectroscopy
Sulfates
Polarization
Corrosion
Direction compound

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

Cite this

Ismail, Kh M. ; Jayaraman, A. ; Wood, Thomas Keith ; Earthman, J. C. / The influence of bacteria on the passive film stability of 304 stainless steel. In: Electrochimica Acta. 1999 ; Vol. 44, No. 26. pp. 4685-4692.
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The influence of bacteria on the passive film stability of 304 stainless steel. / Ismail, Kh M.; Jayaraman, A.; Wood, Thomas Keith; Earthman, J. C.

In: Electrochimica Acta, Vol. 44, No. 26, 15.09.1999, p. 4685-4692.

Research output: Contribution to journalArticle

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