Novel water-based nanosiloxane epoxy coating for corrosion protection of carbon steel

In this study the anticorrosion performance of a two component water-based epoxy coating system is improved by using the 3-glycidoxypropyl trimethoxy silane (GPTMS). The structure of products is characterized by Fourier transform infrared spectrometer (FTIR). The formation of nanosiloxane coating is confirmed by dynamic light scattering (DLS) and Transition electron microscopy (TEM). EIS measurements also indicated an enhancement in protectiveness of water-based nanosiloxane epoxy coating against corrosion, which was characterized by higher coating resistances (Rc), and Z modulus at low frequencies .The improvement in adhesion properties of water-based nanosiloxane epoxy coating is explained by scanning electron microscopy (SEM) and Tapping-mode atomic force microscopy (AFM). Results of salt spray and adhesion tests showed that anticorrosive performance of water-based epoxy coatings improved by adding only 1 wt.% GPTMS to water based curing agent, which is equal with 27 wt.% of water-based epoxy coating.