Investigation of hybrid coatings based on silica nanocomposite containing organic corrosion inhibitor

Corrosion protective coatings were developed on 1050 aluminum alloy through sol–gel process using 3- glycidoxypropyltrimethoxysilane (GPTMS) and tetramethoxysilane (TMOS) and diethylenetriamine (DETA) as cross-linking agent. Two organic corrosion inhibitors (2-mercaptobenzothiazole and 2-mercaptobenzimidazole) were used to induce inhibition properties. Salt spray method was employed to evaluate the corrosion protection performance. It is found that organic inhibitors improved corrosion resistance of the coatings. wettability of the coatings were investigated by water contact angle tests. The results revealed that the presence of organic inhibitors reduced the hydrophilicity. The controlled release of MBI was studied by UV-Vis spectrophotometery too.