TY - CONF A1 - An, Biwen Annie A1 - Koerdt, Andrea T1 - Investigating and modelling MIC using in-house developed flow system (Hi-Tension) N2 - Microbiologically influenced corrosion is a multidisciplinary research area. To develop successful mitigation strategies, expertise from the industry and research institutes are essential. In Department 4.1, we developed an innovative laboratory flow model (Hi-Tension) that allows effective monitoring of MIC under both standard and non-standard conditions. The flow model allows flexibility with material selection, flow rates, temperature and other environmental parameters changes. Furthermore, the flow model allows integration of electrochemical measurements using microsensors, providing a comprehensive view of corrosion at the biofilm level. Currently, initial results indicate corrosion in the flow model is significantly higher than that of standard laboratory set ups, i.e. static incubations, particularly for methane-producing microorganisms. T2 - Departmental Meeting with Helmotz Dresden CY - BAM, Berlin, Germany DA - 04.11.2019 KW - MIC KW - Corrosion KW - FIB/SEM KW - Corrosion products KW - Hi-Tension KW - Flow Model KW - Modelling PY - 2019 AN - OPUS4-49417 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - An, Annie Biwen A1 - Deland, Eric A1 - Kleinbub, Sherin A1 - Koerdt, Andrea T1 - Standardization of MIC laboratory testing: with a special focus on corrosive methanogens N2 - Microbiologically influenced corrosion (MIC) is a highly unpredictable process involving a complex group of microorganisms, including sulfate-reducing bacteria and methanogens. Standard laboratory MIC testing using static serum bottle enrichments is an easy but limited method, offering poor resolution on the biomineralization process of corrosion products. An example of this is the presumed corrosion product siderite by corrosive methanogens (Mi-MIC). Previous publications reported siderite was the sole corrosion product of M. maripaludis using metal coupons incubated under stationary conditions. However, the formation of siderite is closely related to the surrounding environmental conditions, i.e. pH, CO2 concentration, flow and temperature. Thus, siderite as the sole corrosion product of Mi-MIC remain inconclusive and questionable. To study Mi-MIC effectively, a novel versatile multiport flow-column corrosion monitoring system (MFC) was developed. MFC allows sectional corrosion rate determination under flow conditions using different types of material, inoculum and packing material. MFC offers great flexibility, ease of operation and accurate corrosion measurements that can be combined with many other techniques. Using MFC, we studied multiple strains of methanogens and compared it with sulfate-reducing bacteria under neutral and low pH conditions. It was revealed by MFC that corrosive methanogens have equally high corrosion potential as sulfate-reducing bacteria. Additionally, siderite is not the dominant nor sole corrosion product of Mi-MIC. Thus, effective corrosion monitoring and establishing standard laboratory practices, i.e. incorporating MFC as part of regular testing process, will provide deeper understanding of MIC. This will allow further microbial electrophysiology understandings, contributing to effective mitigation strategy development. T2 - EUROPEAN MIC NETWORK WEBINAR CY - Online meeting DA - 19.05.2020 KW - MIC KW - Methanogen KW - FIB/SEM KW - Corrosion products KW - Microbiologically influenced corrosion KW - Flow Model KW - Modelling KW - Korrosion PY - 2020 AN - OPUS4-51554 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Koerdt, Andrea A1 - An, Biwen Annie A1 - Deland, Eric ED - Eibergen, N. ED - Poulassichidis, T. T1 - Novel Multiport Flow-Column Corrosion Monitoring System (MFC) Revealed High Corrosion Rates by Corrosive Methanogenic Archaea N2 - MFC was used to study the corrosiveness of iron-utilizing methanogen, Methanobacterium IM1 under flow conditions. Comparing against electrical SRM, Desulfovibrio ferrophilus IS5, results showed under standard mesophilic conditions, average corrosion rates of Methanobacterium IM1 was double that of SRM. The highest corrosion rate of Methanobacterium IM1 reached up to 0.60 mm/yr under neutral conditions, and severe pitting was observed on the iron surface. Furthermore, the corrosion products of Methanobacterium IM1 were characterized with TOF-SIM, FIB-SEM and EDX, and preliminary results revealed FeCO3 is not the only corrosion product of Mi-MIC, as previously reported. Under low pH conditions, the maximum corrosion rate of Methanobacterium IM1 reached 1.57 mm/yr, which resulted in severed deformity of the iron specimen. Additional comparisons using different types of incubation material were conducted to standardize MFC MIC testing. T2 - Corrosion 2021 CY - Online Meeting DA - 19.04.2021 KW - MIC KW - Microbiologically influenced corrosion KW - Biocorrosion KW - Hi-Tension KW - Environmental condition KW - Flow Model KW - Modelling KW - Korrosion PY - 2021 UR - https://my.nace.org/PaperTrail/Authors/Submission.aspx?id=2b6387be-7390-ea11-813a-005056a95a7c SP - Paper C2021-16303, 1 AN - OPUS4-52480 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -