Novel composite material based on sulfonated graphene and sulfonate barium
Graphene material has been used as a superior protection barrier for metal surface due to its excellent impermeability to corrosive electrolyte. However, it is not satisfactory for long-term corrosion resistance of graphene, which has a tendency to agglomerate in the resin coating. In a new study, a novel anticorrosion filler was fabricated by sulfonated graphene (GS) sheets wrapping sulfonate‑barium (BS) nanoparticles. The composite material (BS@GS) exhibited a flake-like structure with numerous BS nanoparticles (particle size of 20–50 nm) on the sheet surface.
Long-term antocorrosion application
The introduction of BS@GS filler in epoxy resin coating could significantly enhance corrosion resistance of carbon steel. For instance, when added only 4 wt% of BS@GS filler, the impedance modulus at 0.01 Hz of composite coating was still maintained as 1.576 × 105 Ω cm2 after immersion in NaCl solution for 168 h, about 2 orders of magnitude higher than pristine resin coating. According to the researchers, the study developed an effective strategy to achieve long-term anticorrosion application for the graphene material.
The study has been published in Progress in Organic Coatings, Volume 158, September 2021.