Microbial-influenced corrosion (MIC) has been widely recognized as a significant economic and environmental problem in the oil and gas industry. MIC can be classified into two types based on the mechanisms: the extracellular electron transfer MIC (EET-MIC) and the metabolite MIC (M-MIC). The first includes electroactive bacteria that facilitate EET, while the latter includes bacteria that secrete corrosive metabolites. Sulfate-reducing bacteria (SRB) is believed to cause EET-MIC in carbon steel, a widely used metal in the oil and gas industry. In previous electroactive bacteria studies, nanowires have been shown to facilitate EET by acting as electron mediators. This study investigates the use of magnetite nanowires as electron mediators to accelerate EET-MIC of C1020 by Desulfovibrio vulgaris. The addition of 40 ppm (w/w) nanowires to carbon steel incubated with D. vulgaris, corrosive SRB species, for seven days resulted in 45% weight loss and 57% deeper pitting of carbon steel. Furthermore, electrochemical measurements of open circuit potential, linear polarization resistance and potentiodynamic polarization were found to be parallel with weight loss and pitting results. Therefore, these findings highlight the possibility of using magnetic nanowires as an electron mediator with high efficiency and selectivity to EET-MIC for future MIC studies and applications.
| Identifer | oai:union.ndltd.org:kaust.edu.sa/oai:repository.kaust.edu.sa:10754/691371 |
| Date | 04 1900 |
| Creators | Alrammah, Farah |
| Contributors | Rosado, Alexandre S., Daffonchio, Daniele, Biological and Environmental Science and Engineering (BESE) Division, Saikaly, Pascal, Hirt, Heribert |
| Source Sets | King Abdullah University of Science and Technology |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Rights | 2024-05-01, At the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis will become available to the public after the expiration of the embargo on 2024-05-01. |
| Relation | N/A |
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