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

GITTENS, J. E., WANG, H., SMITH, T. J., AKID, R. and GREENFIELD, D. (2009). Biotic sol-gel coating for the inhibition of corrosion in seawater. ECS transactions, 24 (1), 211-229.

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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 can 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 coatings without added endospores.

Item Type:	Article
Additional Information:	International Symposium on Corrosion Protection by Organic Coatings, September 14-18, 2009, Cambridge, UK
Research Institute, Centre or Group:	Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Identification Number:	10.1149/1.3453618
Depositing User:	Heming Wang
Date Deposited:	28 Sep 2010 15:00
Last Modified:	28 Sep 2010 15:00
URI:	http://shura.shu.ac.uk/id/eprint/2495

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