Improved anticorrosion properties of waterborne coatings
Researchers have synthesised gallic acid modified and reduced graphene coated by polydopamine (DM-GO). The results show that gallic acid can reduce graphene oxide and promote the stable dispersion of graphene in solution, and repair some defects of graphene surface through π-π interactions.
Polydopamine can effectively mitigate serious corrosion caused by graphene due to its high electrical conductivity. Because of the barrier effect of well-dispersed graphene and the presence of polydopamine, the addition of DM-GO into waterborne coating leads to the significant improvement of the adhesion and long-term corrosion resistance of coatings.
The study has been published in Progress in Organic Coatings, Volume 173, December 2022.