Preparation of TiO₂-MWCNTs and properties of TiO₂-MWCNTs/epoxy composite epoxy coatings

The multi-walled carbon nanotubes (MWCNTs) were acidified by mixed acid, then the MWCNTs coated with TiO₂ (TiO₂-MWCNTs) hybrid material were prepared by sol-gel method, and the results were verified by X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The silane coupling agent KH560 was used to modify the TiO₂-MWCNTs and MWCNTs, and the composite coating of TiO₂-MWCNTs/epoxy resin, MWCNTs/epoxy resin and the pure epoxy coating was prepared respectively. The electrical properties machine flexibility of composite coatings were tested through EIS and material test system (MTS). Scanning electron microscope (SEM) was used to observe the coatings surface condition. The results show that TiO₂-MWCNTs disperse good in the epoxy resin, TiO₂-MWCNTs/epoxy composite coating in the corrosion medium has good resistance to permeation, and the flexibility of coating is increased greatly after coated by TiO₂.