Microbial corrosion of carbon steel by sulfate-reducing bacteria: Electrochemical and mechanistic approach.

Lars Vendelbo Nielsen, Lisbeth Rischel Hilbert

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    Electrochemical measurements (EIS and DC-polarisation curves) have been conducted on carbon steel coupons exposed in SRB-active environments. Results from EIS measurements show that very large interfacial capacities are found in such systems, and consequently high capacitive currents are to be expected when conducting d.c. polarisation scans. Further, it is indicated that the interfacial capacitance correlates with the concentration of dissolved sulfide, which in turn, to some degree, correlates with hydrogenase activity. It is suggested that the large and increasing interfacial capacitance is responsible for the large potential hysteresis generally found in d.c. scans obtained in these environments. By comparing polarisation curves obtained using different scan rates in an inorganic control environment, it is suggested that an ever increasing interfacial capacitance may be responsible for a misleading conclusion that increasing corrosion rates are caused by cathodic depolarisation in SRB-active environments.
    Original languageEnglish
    Title of host publicationAspects of microbially induced corrosion
    Place of PublicationLondon
    PublisherThe Institute of Materials
    Publication date1997
    Publication statusPublished - 1997

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