Enhanced anticorrosive performance of epoxy coatings

Researchers recently described the the preparation of modified montmorillonite/graphene oxide composites to enhance the anticorrosive performance of epoxy coatings.

The composite coatings (AM@GO/EP) had larger contact angles and smoother surfaces than the epoxy coating (EP). Image source: Pexels - Pixabay (symbol image).

Modified montmorillonite/graphene oxide composites (AM@GO) were prepared by a hydrothermal method with silane coupling agent-modified montmorillonite (APTES@MMT) and combined with GO. Test results showed that the composites had increased interlayer spacing and formed a loosely laminated stacked structure. The specific surface area (31.6863 m2/g) and pore volume (0.0104 cm3/g) of the composites increased. The hydrophobic and anticorrosive properties of the composite coatings were investigated and compared to the epoxy coating.

Improved corrosion resistance

The composite coatings (AM@GO/EP) had larger contact angles and smoother surfaces than the epoxy coating (EP). After 30 days of immersion, the value of |Z|0.01 Hz was approximately 1011 Ω cm2, which had changed slightly since initial immersion. Mechanistic analysis shows that the improved corrosion resistance of the composite coatings was due to the high specific surface area of the 2D material, the oxygen-containing groups of GO, the amino groups of APTES@MMT and the synergy between the MMT and the GO nanosheets.

The study has been published in Journal of Coatings Technology and Research , Volume 20, Issue 3, May 2023.

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