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Geobacter sulfurreducens can protect 304L stainless steel against pitting in conditions of low electron acceptor concentrations

Mehanna, Maha and Basséguy, Régine and Délia, Marie-Line and Bergel, Alain Geobacter sulfurreducens can protect 304L stainless steel against pitting in conditions of low electron acceptor concentrations. (2010) Electrochemistry Communications, vol. 12 (n° 6). pp. 724-728. ISSN 1388-2481

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Official URL: http://dx.doi.org/10.1016/j.elecom.2010.03.017

Abstract

The effect of Geobacter sulfurreducens cells was studied on the electrochemical behaviour of 304L stainless steel, emphasizing the role of the soluble electron acceptor (fumarate). In fumarate-lacking media, the presence of G. sulfurreducens induced free potential ennoblement in a few hours. This ennoblement has already been observed in standard media that contained fumarate. Our previous studies have shown that G. sulfurreducens shifted the pitting potential toward the positive values. The pits induced by the presence of the bacteria were wider and deeper than in the absence of bacteria. Here, in fumarate-lacking media, similar shift in pitting potential was observed, but the repassivation phase was strongly improved. AFM analysis showed that pits were identical with those observed in the absence of bacteria at lower potential. In contrast with all the previous work where G. sulfurreducens enhanced corrosion, here at a low concentration of electron acceptor, the presence of the bacteria protected the steel against pitting.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Electrochemistry Communications website : http://www.sciencedirect.com/science/journal/13882481
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Bioprocédés et systèmes microbiens (BioSyM)
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Deposited By: Regine BASSEGUY

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