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Role of direct microbial electron transfer in corrosion of steels

Mehanna, Maha and Basséguy, Régine and Délia, Marie-Line and Bergel, Alain Role of direct microbial electron transfer in corrosion of steels. (2009) Electrochemistry Communications, vol. 1 (n° 3). pp. 568-571. ISSN 1388-2481

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Official URL: http://dx.doi.org/10.1016/j.elecom.2008.12.019

Abstract

It has recently been discovered that many microbial species have the capacity to connect their metabolism to solid electrodes, directly exchanging electrons with them through membrane-bound redox compounds,nevertheless such a direct electron transfer pathway has been evoked rarely in the domain of microbial corrosion. Here was evidenced for the first time that the bacterium Geobacter sulfurreducens is able to increase the free potential of 304 L stainless steel up to 443 mV in only a few hours, which represents a drastic increase in the corrosion risk. In contrast, when the bacterial cells form a locally wellestablished biofilm, pitting potentials were delayed towards positive values. The microscopy pictures confirmed an intimate correlation between the zones where pitting occurred and the local settlement of cells. Geobacter species must now be considered as key players in the mechanisms of corrosion.

Item Type:Article
Additional Information:This publication is available on http://www.sciencedirect.com/science/journal/13882481
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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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