COMPOSITE EPOXY-TITANIA COATINGS FOR ANTI-CORROSION PROTECTION OF D16 ALUMINUM ALLOY
Anticorrosive properties of coatings based on dicyclohexylolpropane diglycidyl ether and ED-20 resin, as well as titanium tetrabutoxide and metals corrosion inhibitor, 1,2,3-benzotriazole, were studied. Titanium dioxide in an amount of 0.5-10 wt. % was formed in situ by the sol-gel method. Composites obtained by sequential formation of a polymer matrix and a nanofiller increase the anticorrosion resistance of the samples to 70 kΩ∙cm2. The additional introduction of benzotriazole into the composition of the composite coatings provides the anticorrosive resistance of the substrate equal to 99 kΩ∙cm2. The effectiveness of anti-corrosion protection of alloy D16 by such coatings was more than 99 %. Coatings obtained with the simultaneous formation of polymer and TiO2 and containing benzotriazole retain high efficiency of anti-corrosion protection even after application of lattice cuts to them. At the same time, titanium dioxide has an inhibitory effect on the process of thermal oxidative destruction of composites.