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Geabacter species enhances pit depth on 304L stainless steel in a medium lacking with electron donor

Mehanna, Maha and Basséguy, Régine and Délia, Marie-Line and Gubner, Rolf and Sathirachinda, Namurata and Bergel, Alain Geabacter species enhances pit depth on 304L stainless steel in a medium lacking with electron donor. (2009) Electrochemistry Communications, vol. 11 (n° 7). pp. 1476-1481. ISSN 1388-2481

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Official URL: http://dx.doi.org/10.1016/j.elecom.2009.05.035

Abstract

Geobacter sulfurreducens bacteria increased the open circuit potential of 304L stainless steel by around 320 mV in only a few hours after inoculation. This represents a significant increase in the corrosion risk. In contrast, the oxidation of acetate, which is catalysed by well-established biofilms, shifted the pitting potential towards positive values. In acetate-lacking media, pitting occurred with and without bacteria in the same range of potential values, but the presence of bacteria drastically increased the size of pits. AFM showed pits more than 10 times broader and deeper due to the presence of bacteria. In the absence of acetate, the masking effect due to acetate oxidation disappeared and the full corrosive effect of the biofilm was revealed. This also fully explains why pitting was predominantly observed close to surface areas where bacterial settlement was the densest.

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.elsevier.com/wps/find/journaldescription.cws_home/601449/description#description
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
Other partners > Swedish Corrosion Institute (SWEDEN)
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Bioprocédés et systèmes microbiens (BioSyM)
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Deposited By: Regine BASSEGUY
Deposited On:09 Mar 2011 11:35

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