Recent advancements in the field of intelligent anticorrosive coatings have been reported by a team led by Professor Zhuohong Yang from the College of Materials and Energy at South China Agricultural University. Their research progress focuses on the structural design of smart anticorrosive coatings and the study of corrosion prevention mechanisms. Two of their achievements have been published in the Chemical Engineering Journal, while another has been published in the Corrosion Science journal.
While coatings effectively prevent metal corrosion, they often develop micropores and microcracks during the curing process. Additionally, environmental factors inevitably degrade coatings, leading to insufficient protection and shortening the lifespan of metal materials. Inspired by the self-protective mechanism of the sensitive plant (Mimosa pudica), the research team has developed a smart anticorrosive coating using a triazine monomer and lignin-grafted graphene oxide. This coating exhibits intelligent anticorrosive properties against ferrous ions. This work not only imparts self-healing capabilities to the coating, prolonging the lifespan of metals but also expands the application of biomass material lignin in the field of corrosion prevention.
Building upon this, the team further investigated the self-healing anticorrosive properties of coatings prepared using modified graphene oxide with single pyridine structures and coupling agents. Their research indicates a strong interaction between the modified graphene oxide and ferrous ions. After the formation of ferrous ions due to metal corrosion, the complexation between them and pyridine enables self-healing of the coating, thereby enhancing its anticorrosive properties.
Inspired by the polyphenolic hydroxyl structure of tannic acid, the Zhuohong Yang team utilized a novel furan diamine as a "bridge" through an amine-aldehyde condensation reaction to prepare tannic acid-modified graphene oxide. When incorporated into resin composite coatings, these coatings achieve self-healing under near-infrared irradiation. The coupling of tannic acid with corrosion products enhances the synergistic anticorrosive properties of the coating.
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