Synthesis of PDA BN@f Al2O3 hybrid for nanocomposite epoxy coating with superior corrosion protective properties
Abstract A novel PDA BN@f Al2O3 nanohybrid was synthesized by depositing Al2O3 nanoparticles modified with g Aminopropyltriethoxysilane (KH550) on the surface of hexagonal boron nitride (h BN) sheets covered with polydopamine (PDA) Then, PDA BN@f Al2O3 hybrids was dispersed in epoxy resin to prepare composite coating samples. Many characterizations revealed that the functionalized Al2O3 successfully deposited on the surface of PDA BN platelets and PDA BN@f Al2O3 hybrids showed good dispersibility in the epoxy resin, and the interfacial adhesion between hybrids and epoxy matrix was improved. Furthermore, the effects of Al2O3, h BN and various mixtures of PDA BN@f Al2O3 hybrids at a low weight fraction of 1 on the corrosion resistance of epoxy coating were studied by electrochemical measurement and salt spray test. The potentiodynamic polarization test revealed that PDA BN@f Al2O3 hybrids have a corrosion inhibitive performance. Moreover, the coating resistance of PDA BN@f Al2O3 (3:1)/epoxy was enhanced by three orders of magnitude compared with neat epoxy after 5 d immersion. This study provides a promising application prospect for the development of superior metal protective organic coatings.