Abstract
Corrosion of metals is a serious and challenging problem faced worldwide by industry. Purified Leuconostoc mesenteroides exopolysaccharide (EPS) coatings, cast from aqueous solution, inhibited the corrosion of low-carbon steel as determined by electrochemical impedance spectroscopy (EIS). There were two different corrosion behaviors exhibited when EPS films from different strains were cast onto the steel. One EPS coating reacted immediately with the steel substrate to form an iron (III) oxide layer (“rust”) during the drying process while another did not. The samples that did not flash corrode had higher corrosion inhibition and formed an iron (II) passivation layer during EIS testing that persisted after the cells were disassembled. Corrosion inhibition was strain-specific as polysaccharides with similar structure did not have the same corrosion potential.
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Acknowledgements
The authors thank Dr. Morey Slodki for the gift of the phosphomannan, and Ms. Joan Combie for the sample of Levan. The authors would like to thank Mr. Rick Haig for his technical contribution.
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Finkenstadt, V.L., Côté, G.L. & Willett, J.L. Corrosion protection of low-carbon steel using exopolysaccharide coatings from Leuconostoc mesenteroides . Biotechnol Lett 33, 1093–1100 (2011). https://doi.org/10.1007/s10529-011-0539-2
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DOI: https://doi.org/10.1007/s10529-011-0539-2