Novel epoxy coating for corrosion protection of steel

In a new study, 4-Aminoantipyrine (AAP) was grafted on graphene oxide (GO) via the hydrothermal strategy (GO@AAP) to improve the corrosion resistant property of epoxy coating.

Steel cubes as a symbolic image.
Metallic corrosion Image source: PIRO4D - Pixabay (symbol image).

Electrochemical and salt spray test results have indicated that incorporating as-synthesised GO@AAP into epoxy coating powerfully enhanced the anti-corrosion property. Besides, after 60 days of immersion, the |Z|0.01 Hz was 3.7 × 108 Ω·cm2, which was two order of magnitude higher than that of pure epoxy coating.

New method

Local electrochemical impedance spectroscopy (LEIS) was visually demonstrated the synergistic effect of physical shielding and corrosion inhibition of GO@AAP in 3.5 wt% NaCl solution. According to the researchers, their work provides a new method to achieve the barrier and inhibition activities of epoxy coatings, which are suitable for heavy corrosion resistant application in harsh environment.

The study has been published in Progress in Organic Coatings, Volume 174, January 2023.

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