Abstract
Acrylic coatings were modified by adding silica nanoparticles to obtain transparent, non‐yellowing and chemically stable coatings, having also good corrosion resistance. Low carbon steel sheets were used as substrate. Pre‐formed nano‐silica particles, prepared by sol‐gel chemistry from methyltriethoxysilane (MTES) and methacryloxypropyltrimethoxysilane (MPTMS) precursors, were dispersed into acrylic resin matrix. Unfilled coating was also produced for comparison. The uniformity of the coatings and the dispersion of nanoparticles in the polymeric matrix were investigated using transmission electron microscopy (TEM) and atomic force microscopy (AFM). The performance of the coatings was evaluated in terms of their UV resistance, optical properties, and corrosion resistance. The corrosion protection performance of the coatings was evaluated using potentiodynamic polarization technique and electrochemical impedance spectroscopy (EIS) in 3.5 wt% NaCl solution at room temperature. TEM studies indicate that silica nanoparticles were homogeneously dispersed through the polymer matrix. The polarization curves, corrosion resistance as measured by the Nyquist plots as well as salt spray tests suggest that the acrylic coating with homogeneously‐dispersed nanoparticles offer the best protection against corrosion.
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