The improvement of corrosion resistance of fluoropolymer coatings by SiO2/poly(styrene-co-butyl acrylate) nanocomposite particles

• Published in: Applied surface science 2015-10, Vol.353, p.254-262
• Main Authors: Chen, L., Song, R.G., Li, X.W., Guo, Y.Q., Wang, C., Jiang, Y.
• Format: Article
• Language: English
• Subjects: Coatings; Corrosion resistance; Electrochemical impedance spectroscopy; Fluoropolymer coatings; Fluoropolymers; Nanocomposite particles; Nanocomposites; Nanostructure; Polystyrene resins; Protective coatings; Silica; Texture
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2015.06.148

•We first proposed the feasibility of organic-inorganic hybrid particles can be used to reduce free space of the fluoropolymer coatings.•By grafting poly(styrene-co-butyl acrylate), nano-silica particles can be better dispersed in the fluoropolymer coatings system.•The coating-substrates bound strength could be obviously seen in the FESEM cross-section images.•The effects of the corrosion resistance of fluoropolymer-coated steel were investigated by potentiodynamic polarization and EIS.•Using models to analysis the anticorrosion mechanism of nanocomposite coatings. The effects of nano-silica particles on the anticorrosion properties of fluoropolymer coatings on mild steel have been investigated in this paper. In order to enhance the dispersibility of nano-silica in fluoropolymer coatings, we treated the surface of nano-silica with poly(styrene-co-butyl acrylate) (P(St-BA)). The surface grafting of P(St-BA) on the nanoparticles were detected using Fourier transform infrared spectroscopy (FT-IR), thermo gravimetric analyzer (TGA), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The surface of nanocomposite coatings and the coating-substrates bond texture were detected by FE-SEM. We also used energy-dispersive X-ray spectroscopy (EDS) to analyze whether the nanocomposite particles were added into the fluoropolymer coatings. In addition, the influences of various nanoparticles on the corrosion resistance of fluoropolymer-coated steel were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results shown that nanocomposite particles can be dispersed better in fluoropolymer coatings, and the electrochemical results clearly shown the improvement of the protective properties of the nanocomposite coatings when 4wt.% SiO2/P(St-BA) was added to the fluoropolymer coatings.