The hydrogenotrophic sulfate-reducing bacterium (SRB) Desulfovibrio capillatus (DSM14982T) was isolated from an oil field separator with serious corrosion problems; this is the study of its role in the corrosion of carbon steels under anaerobic conditions. Immersion tests with two steel alloys, St-35.8 (typical carbon steel employed in European naval industry), and API-5XL52 (weathering alloy steel employed in Mexican oil industries) were performed. The immersion tests were conducted at 40 deg C in anaerobic medium containing (per L destilled water): 1g NH4Cl, 0.3g K2HPO4, 0.1g KCl, 0.1g CaCl2.2H2O, 0.5g MgCl2.6H2O, 30g NaCl, 0.5g cystein-HCl, 2g yeast extract, 1mg resazurin, and 10 ml trace mineral element solution. the pH was adjusted to 7 with 10 M KOH. Total exposure was 45 days and different concentrations of thiosulfate as electron acceptor for bacterial growth were employed. The samples immersed in media with SRB undergo fast activation and numerous active sites form on the surface. Microscopic observations were made by environmental scanning electron microscopy (ESEM). Weight loss and electrochemical testing included open circuit potential (Ecorr), polarization resistance (Rp), electrochemical impedance spectroscopy (EIS) and electrochemical noise (EN) were measured with and without bacteria in the culture medium in order to determine corrosion rates and mechanisms. All electrochemical techniques have shown that after the end of the exponential phase the corrosion activity notably increased due to the high concentration of bacterial metabolites. Finally, the corrosion behavior of API-5XL52 was worse than St-35.8.
Biocorrosion of carbon steel alloys by an hydrogenotrophic sulfate-reducing bacterium Desulfovibrio capillatus isolated from a Mexican oil field separator
Biokorrosion von Kohlenstoffstählen durch das hydrogenotrophe sulfatreduzierende Bakterium Desulfovibrio capillatus, isoliert aus einem Separator des mexikanischen Ölfeldes
Corrosion Science ; 48 , 9 ; 2417-2431
2006
15 Seiten, 12 Bilder, 2 Tabellen, 34 Quellen
Article (Journal)
English
bakterielle Korrosion , Bakterienstamm , Sulfat , chemische Reduktion , Erdölindustrie , Mexiko , kohlenstoffreicher Stahl , witterungsbeständiger Stahl , Tauchversuch , Korrosionspotenzial , Potenzialzeitkurve , Impedanzspektrometrie , Rauschmessung , energiedispersive Spektrometrie , Rasterelektronenmikroskopie , Gewichtsverlust-Zeit-Diagramm , Korrosionsprodukt , Separator , Chrom-Nickel-Kupfer-Stahl
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