Improving the anti-corrosion performance of epoxy coatings

Solvent-based epoxy resins are often used for the anti-corrosion purpose but their cured process fabricating plentiful micro-pore via solvent evaporation is an intrinsic shortcoming and it is thus necessary to obstacle their micro-pore for enhancement antiseptic property.

TiO2 graphene oxide dramatically improved the anti-corrosion performance of epoxy coatings. Source: Karin Schumann/ -

With the purpose of the enhancement, Chinese researchers synthesised TiO2–GO sheet hybrids using titanium dioxide loading on graphene oxide sheets with the help of 3-aminopropyltriethoxysilane, and dispersing the sheets into epoxy resin at a low weight fraction of 2%.

Well dispersing performance for epoxy resin

The electrochemical impedance spectroscopy (EIS) test and monitoring coatings' morphology in corrosion process reveal that the corrosion resistant performance is significantly enhanced by the addition of TiO2–GO hybrids to epoxy. Comparisons with other nanofillers including TiO2 and graphene oxide (GO) indicate that TiO2–GO hybrids exhibit an obvious superiority in enhancing the corrosion resistant of epoxy coatings at the same contents. The superiority of the TiO2–GO hybrids is related to their exfoliation, dispersion and excellent plugging micro-pore property arising from their laminated structure. Furthermore, the corrosion resistant mechanisms were tentatively proposed for the TiO2–GO/epoxy coatings.

The study is published in: Surface and Coatings Technology, Volume 276, 25 August 2015, Pages 471-478.

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