Bionic modified h-BN loaded CeO2 nanoparticles to improve the anti-corrosion properties of composited epoxy coatings.

Hexagonal boron nitride (h-BN), as a two-dimensional lamellar material, has been paid more and more attention in the field of corrosion protection because of its excellent thermal stability, chemical stability and insulation. In order to solve the problem that h-BN is difficult to disperse in resin, inspired by the adhesion ability of mussel secretions, the surface of h-BN was modified with polydopamine (PDA) to improve the dispersion of the fillers in epoxy resin, and the prepared corrosion inhibition CeO 2 nanoparticles were loaded on the surface. A functional filler CeO 2 &PDA/h-BN with corrosion inhibition effect was prepared. The surface morphology, chemical structure and thermal stability of functional fillers were analyzed by SEM, FTIR, XRD and thermogravimetric analysis. The test results show that after 40 days of testing, the low-frequency impedance modulus of the epoxy composite coating is 15 times that of the pure epoxy resin, and the wear resistance properties also significantly improved. The anti-corrosion mechanism of the composite coating is analyzed, and the synergistic effect of h-BN's barrier ability and CeO 2 's corrosion inhibition ability is revealed. This paper provides an idea for the preparation of multifunctional h-BN composite anticorrosive filler. [Display omitted] • The nanoscale corrosion inhibitor CeO 2 was synthesized successfully. • Prepared anti-corrosion filler CeO 2 &PDA/h-BN was by biomimetic material. • The corrosion inhibition capacity of the filler is as high as 73.20 %. • The composite coating showed excellent anti-corrosion effect. [ABSTRACT FROM AUTHOR]