High anticorrosion performance of polyvinyl butyral/carbonized polyaniline/modified titanium dioxide composite coating

In this study, carbonized polyaniline (CPANI) and modified TiO2 (TiO2-KH550) were mechanically blended and added to polyvinyl butyral (PVB) coating as anti-corrosion fillers to obtain a PVB/CPANI/TiO2-KH550(PCTK) composite coating, and the corrosion resistance of the coating on 304SS was investigated. The composites and composite coatings were characterized by Fourier transform infrared spectroscopy (FT-IR) to verify the reaction between KH550 and TiO2 and the compatibility of the composites with the coatings. The surface morphological characteristics of the composites were observed using Scanning Electron Microscopy and Transmission Electron Microscopy, and the results showed that the composites were homogeneously dispersed. In addition, the mechanical properties and adhesion of the composite coatings were tested with an adhesion rating of 5B. Electrochemical tests were used to explore the anti-corrosion properties of the composite coatings, and the results show that the composite coating with a composite content of 3.5% has the largest low-frequency impedance and the smallest corrosion rate in different corrosive environments. In a 3.5 wt% NaCl solution, the composite coating protects the substrate for up to 314 days. This study may provide new possibilities for the application of polyaniline derivatives in the field of anticorrosive coatings.