Journal
CORROSION SCIENCE
Volume 180, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.109179
Keywords
Carbon steel; Modelling studies; SIMS; SEM; Reactor conditions; Microbiologically influenced corrosion
Funding
- BAM through the MIC project
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The corrosive potential of methanogen-induced microbiologically influenced corrosion on carbon steel is not suitable for determining through static-incubations, as higher corrosion rates were observed using a multiport-flow-column. Contrary to previous data, the corrosion products contain various elements but lack carbon-related species, and the disruption of siderite nucleation by methanogens results in increased localized corrosion.
Currently, corrosion rates (CR) and/or corrosion products (CP) obtained for methanogen-induced microbiologically influenced corrosion (Mi-MIC) on carbon steel are mainly analyzed from static-incubations. By using a multiport-flow-column, much higher CRs (0.72 mm/yr) were observed, indicating static-incubations are not suitable for determining the corrosive potential of Mi-MIC. With the combination of various analytical methods (ToF-SIMS/SEM-EDS/SEM-FIB) and contrary to previously published data, we observed that CPs contained phosphorus, oxygen, magnesium, calcium and iron but lacked carbon-related species (e.g. siderite). Overall, siderite nucleation is disrupted by methanogens, as they convert aqueous bicarbonate into carbon dioxide for methanogenesis resulting in increased localized corrosion.
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