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Presentation of the MIC-project (Microbially Induced Corrosion) within the focus area Materials of the BAM. Strategies, developments and innovations in the area of analytical tools, surface modifications, polymer stability and biofilm-enhanced deteriorations of materials in the context of microbially induced corrosion processes.
Microbially induced corrosion (MIC) is a severe cost and risk factor for the oil and gas industry, water heat- and cooling systems, waste water management, and infrastructural constructions. The industrial preventions management of MIC focuses on eliminating present microorganisms, which leads to the repeated and time-consuming application of biocides. However, biocides are often only minor effective for microorganisms that live protected from these agents in a biofilm matrix formed on material surfaces. In recent years, microbiologist have renewed our vision on the electrochemical processes underlying material corrosion induced by sulfate reducing bacteria, but the knowledge at the level of multispecies biofilm formation and the effects of material’s properties are still rather scarce.
Therefore, an interdisciplinary team of material scientists, chemists and microbiologists, established a MIC-research platform at the Federal Institute for Materials Research and Testing (BAM) to study the effects of material’s properties and biofilm formation on MIC. Using femtosecond laser pulse technology steel surfaces with defined nanostructures were manufactured. The test pieces were incubated using a flow-through chambers setup with different organisms relevant for biofilm studies. Our studies showed, that nanoscale structures severely affect the biofilm thickness and, hence, growth for health threatening organisms like E. coli and S. aureus, but also for MIC-relevant bacteria such as Fe(III)-reducing Shewanella spec.
Another aspect of the biofilm matrix is the establishment of microscale environments with conditions, such as anaerobic or acidic microenvironments, which promotes a diverse multispecies community. However, the detection and visualization of such small-scale microenvironments is rather challenging. Further, it could directly indicate the activity of microorganism influencing or inducing corrosion processes. Therefore, dye-stained nanoscale particles, bearing pH-responsive fluorophores at the surface, were developed to measure the pH at the biofilm’s surface and within the matrix using confocal laser scanning microcopy. The particles will be further advanced to measure other environmentally relevant parameters, including oxygen concentration, and concentrations of selected metal ions indicative of corrosion of e.g., materials used for water pipelines. In the future, our platform and its analytical tools will be employed to study the formation of biofilms in dependency of the respective support material, its surface properties like roughness, and the microbial community.
Introduction on BAM developments in the project “Microbially Induced Corrosion” (MIC) for new analytical tool, surface modifications and bacterial biofilm developments in the course of the ICBM-Colloquia at the Institut für Chemie und Biologie des Meeres (ICBM) of the Carl-von-Ossietzky-University in Oldenburg.