In marine environments corrosion is exacerbated by the formation of destructive biofilms containing sulphate-reducing bacteria, which promote corrosion by forming corrosive species, notably H2S. Corrosion-causing biofilms are often resistant to inactivation by biocides since the biofilm bacteria are protected by a matrix of exopolymeric substances (EPS). Paradoxically, a biofilm of the endosporeforming Paenibacillus polymyxa can actually inhibit corrosion. Sol gel technology and immobilized microorganisms have been combined in a unique coating that inhibits corrosion on aluminium alloys, being low-cost, effective and environmentally friendly. Viability studies have shown that P. polymyxa endospores are able to withstand solvent concentration of up to 50% and an acid concentration of up to 1.5M and germinate within a biotic sol-gel coating. Laboratory electrochemical impedance spectroscopy and linear polarization resistance tests, in addition to an extended field trial at Whitby Harbour, have shown that the coatings loaded with P. polymyxa endospores show resistance to corrosion and biofilm formation relative to the abiotic control coatings without added endospores.
Prevention of biofouling and microbial induced corrosion using biotic sol-gel coatings
Vorbeugung vor maritimem Bewuchs und mikrobiell verursachter Korrosion unter Verwendung biotischer Sol-Gel-Beschichtungen
2010
8 Seiten, 7 Bilder, 6 Quellen
Conference paper
English
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