Geobacter species enhances pit depth on 304L stainless steel in a medium lacking with electron donor
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,...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
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Elsevier
2009
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| Online Access: | http://hdl.handle.net/20.500.11937/8883 |
| _version_ | 1848745788846374912 |
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| author | Mehanna, M. Basseguy, R. Delia, M. Gubner, Rolf Sathirachinda, N. Bergel, A. |
| author_facet | Mehanna, M. Basseguy, R. Delia, M. Gubner, Rolf Sathirachinda, N. Bergel, A. |
| author_sort | Mehanna, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T06:22:56Z |
| format | Journal Article |
| id | curtin-20.500.11937-8883 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:22:56Z |
| publishDate | 2009 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-88832017-02-28T01:30:44Z Geobacter species enhances pit depth on 304L stainless steel in a medium lacking with electron donor Mehanna, M. Basseguy, R. Delia, M. Gubner, Rolf Sathirachinda, N. Bergel, A. Stainless steel Microbial corrosion Direct electron transfer Geobacter sulfurreducens Electrochemically active biofilms 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. 2009 Journal Article http://hdl.handle.net/20.500.11937/8883 Elsevier restricted |
| spellingShingle | Stainless steel Microbial corrosion Direct electron transfer Geobacter sulfurreducens Electrochemically active biofilms Mehanna, M. Basseguy, R. Delia, M. Gubner, Rolf Sathirachinda, N. Bergel, A. Geobacter species enhances pit depth on 304L stainless steel in a medium lacking with electron donor |
| title | Geobacter species enhances pit depth on 304L stainless steel in a medium lacking with electron donor |
| title_full | Geobacter species enhances pit depth on 304L stainless steel in a medium lacking with electron donor |
| title_fullStr | Geobacter species enhances pit depth on 304L stainless steel in a medium lacking with electron donor |
| title_full_unstemmed | Geobacter species enhances pit depth on 304L stainless steel in a medium lacking with electron donor |
| title_short | Geobacter species enhances pit depth on 304L stainless steel in a medium lacking with electron donor |
| title_sort | geobacter species enhances pit depth on 304l stainless steel in a medium lacking with electron donor |
| topic | Stainless steel Microbial corrosion Direct electron transfer Geobacter sulfurreducens Electrochemically active biofilms |
| url | http://hdl.handle.net/20.500.11937/8883 |