Biotic sol-gel coating for the inhibition of corrosion in seawater

J. Gittens, H. Wang, T. J. Smith, R. Akid, D. Greenfield

    Research output: Contribution to journalArticlepeer-review

    Abstract

    In marine environments corrosion is exacerbated by formation of destructive biofilms containing sulphate-reducing bacteria, which promote corrosion by forming corrosive species, such as 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 endospore-forming 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 show 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. Electrochemical impedance spectroscopy and linear polarization resistance tests, in addition to an extended field trial, have shown that the endospore-loaded coatings show resistance to corrosion and biofilm formation relative to the coatings without added endospores. ©The Electrochemical Society.
    Original languageEnglish
    Pages (from-to)211-229
    Number of pages18
    JournalECS Transactions
    Volume24
    Issue number1
    DOIs
    Publication statusPublished - 2010

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