Effect of graphene on the corrosion evolution of zinc-containing coatings in epoxy.

A new study examines the effects of graphene on the corrosion evolution of zinc particles in water-based epoxy-containing coatings.
for research, graphene/water-based epoxy zinc-containing coatings with different graphene content were prepared. The corrosion resistance of graphene/water-based epoxy zinc coating was studied through electrochemical impedance spectrum (EIS), immersion test and neutral salt

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Improves cathode protection and barrier performance
results show that adding 0.6 wt% graphene to coatings significantly improves cathode protection and barrier performance compared to graphene-free coatings.
addition, the effects of graphene on the corrosion evolution of zinc particles in coatings were observed through field emission scanning electron microscopes (FE-SEMs) combined with energy dispersion spectroscopy (EDS). The results show that under the cathode protection of steel, the corrosion medium spreads into the coating and reaches the interface, the zinc particles near the steel bottom and coating interface are first corroded and then continue to be corroded from the interface. Thanks to the electrical connection of graphene, they provide cathodic protection for the substrate, thus protecting the coating.
, the X-ray diffraction map confirms that the corrosion products of zinc particles are mainly made up of Zn 5 (OH) 8 Cl 2. H 2 O composition.
the study was published in March 2020 in volume 140 of Organic Coatings Progress.
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