Graphene based polymer anticorrosive coatings

Lowering the conductivity: Scientists have synthesised poly(p-phenylenediamine) encapsulated graphene and described its application in steel protection.

The obtained composite coating could achieve efficient self-healing behavior under sunlight.  Image source: Broesis - Pixabay (symbol image).

Graphene (G) is an excellent protection material, but suffering corrosion-promotion effect because of its intrinsic high electrical-conductivity. Now, a facile strategy is presented to effectively lower the conductivity of the G by the encapsulation of insulating poly(p-phenylenediamine) (PpPD). The obtained G@PpPD, which delivers an extremely low conductivity of 3.5×10−7 S cm-1, were then mixed with polyvinyl-butyral (PVB), forming a compact composite coating that can effectively protect Q235 steel from being corroded over a very long period.

Synergistic effect

Such a superior anticorrosion property can be owing to the synergistic effect between impermeable graphene and insulating PpPD, which not only hinders the diffusion of the corrosive media, but also inhibits the corrosion-promotion activity of the graphene. This effective strategy may provide valuable enlightenment for the further development of graphene-based polymer anticorrosive coatings with long-lasting corrosion resistance.

The study has been published in Progress in Organic Coatings, Volume 158, September 2021.

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