Abstract
Abstract Inhibitor-loaded silica nanospheres were synthesized and incorporated into epoxy coating for active corrosion protection of carbon steel substrate. Potentiodynamic polarization, electrochemical impedance spectroscopy, UV–Vis spectroscopy and scanning electron microscopy were used to investigate the protection performance of the nanocomposite coatings containing 1, 3 and 5 wt% of 2-mercaptobenzothiazole-loaded silica nanospheres. While, all nanocomposite coatings exhibited active corrosion protection, the superior protection performance was observed for a composite coating with 3 wt% of silica nanocontainer. It was revealed that in presence of inhibitor-loaded silica nanospheres, the coating protection performance was increased by increasing the immersion time in a 3.5 wt% NaCl solution. The superior active protection performance of the prepared nanocomposite coatings was attributed to the on-demand release of inhibitor species where the substrate is exposed to the environment due to the existence of defects in the coating layer.
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