In this study, the time-dependent corrosion protection ability of 10–15 m thin polydimethylsiloxanenanoparticle
composite coatings was evaluated using mainly open circuit potential and electrochemical
impedance spectroscopy measurements. The best result was obtained for the coating containing 20 wt%
hydrophobic silica nanoparticles, where it was possible to achieve protection for almost 80 days in 3 wt%
NaCl solution. The protective properties offered by this coating are suggested to be due to a synergistic
effect of the hydrophobicity of the polydimethylsiloxane matrix and the prolonged diffusion path caused
by addition of hydrophobic silica particles.