A new approach was made by using a new developed lab scale model system containing working electrodes in different height levels to simulate ground, mid and splash zone of a ship ballast tank with the help of a three dimensional shaking plate. By studying a defined mix culture of aerobic and anaerobic bacteria and a natural sample community it was possible to model the corrosion behavior of low carbon steel exposed to bacteria in different zones.
Electrochemical impedance data (EIS) provide the contingency to distinguish between general corrosion and MIC impact in a more detailed way. Fluorescent staining in liquid allowed monitoring biofilm development and activity on steel coupons supporting EIS data. By additional study of the electrode surfaces by SEM-EDX the impact of MIC could be shown.
Keywords: MIC, EIS, ballast tank, Microscopy, SEM-EDX
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