Fabrication of h-BN-rGO@PDA nanohybrids for composite coatings with enhanced anticorrosion performance

Inspired by mussels’ universal adhesive ability to various substrates, polydopamine (PDA) was used to bind graphene oxide (GO) and hexagonal boron nitride (h-BN) together to fabricate [email protected] nanohybrids. The as-prepared [email protected] nanohybrids were served as anticorrosive nanofillers for polyvinylbutyral (PVB) coatings on mild steel. The structure of [email protected] nanohybrids were characterized by SEM, XRD, FT-IR, UV–vis and Raman spectroscopies. Electrochemical corrosion tests were conducted to examine the anticorrosion properties of [email protected]/PVB composite coatings. The results show that the stacked h-BN nanosheets are exfoliated by GO. And PDA is successfully grafted onto the surface of [email protected] and simultaneously reduced GO into rGO. The [email protected] nanohybrids are homogeneously distributed in the PVB matrix. When the mass ratio of GO to h-BN in [email protected] is 1:1, the as-prepared [email protected] possesses effective aspect ratio and thus its PVB composite coating obtains the optimal anticorrosion performance with 2 orders of magnitude higher than pure PVB.