Synthesis and characterization

Abstract

Multiwalled carbon nanotubes (MWCNTs) were acidified with nitration mixture; the silicon oxide-coated MWCNTs (SiO₂-MWCNTs) hybrid material was then prepared via the sol–gel method, and the results were verified using scanning electron microscopy (SEM), X-ray diffraction, and thermogravimetric analysis (TGA). We modified the hybrid material with silane coupling agent (KH560) and prepared SiO₂-MWCNTs/epoxy, MWCNTs/epoxy composite coating, and the pure epoxy coating, respectively. The impedance performance was tested using electrochemical workstation (electron ionization spray); then, the mechanical properties and thermal stability were tested through the shock experiments and TGA. Finally, we used SEM to observe the coating surface condition. The results show that SiO₂-MWCNTs have a good dispersion in the epoxy resin and the mechanical properties and corrosion resistance of SiO₂-MWCNTs/epoxy composite coating have enhanced.