Novel Multiport Flow-Column Corrosion Monitoring System (MFC) Revealed High Corrosion Rates by Corrosive Methanogenic Archaea

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Product Number: 51321-16303-SG

Author: Biwen Annie An/Eric Deland/Andrea Koerdt

Publication Date: 2021

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Microbiologically influenced corrosion (MIC) is a complex and costly issue that is often attributed to the activities of sulfate-reducing bacteria (SRB) mainly because oftheir abilities to produce hydrogen sulfide. Other groups of MIC-related microorganisms, including methanogenic archaea (MA), are often underrepresented due to inadequate monitoring techniques. The main MIC mechanism of MA is through the direct uptake of electrons from the metal surfacessince their metabolic product, methane, is unreactive. To accurately study their MIC potential, a versatile multiport flow-column (MFC) was developed. The MFC revealed an extensive corrosion rate profile for the corrosive MA, with a maximum corrosion rate of 0.38 mm/yr and an average corrosion rate of 0.17 mm/yr at neutral pH. In comparison, the corrosive SRBin the MFCreachedanaverage corrosion rate of 0.1 mm/yr. At low pH, the average corrosion rate of MA was 0.17 mm/yr but with a maximum of 1.57 mm/yr.Surface analyses of the corrosion layer showed that iron carbonate is not the sole corrosion product of methanogen-induced MIC (Mi-MIC). Overall, this study highlighted the importance of using environmentally relevant study techniques to accurately depict the corrosion potential of MIC,especially forMi-MIC.

Keywords:Microbiologically influenced corrosion, anaerobic microorganism, environmental simulation, microbial modelling, methanogenic Archaea, sulfate-reducing bacteria

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Keywords:Microbiologically influenced corrosion, anaerobic microorganism, environmental simulation, microbial modelling, methanogenic Archaea, sulfate-reducing bacteria

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