Anti-corrosion primer coatings based on acrylate trialkoxysilanes

The article investigates the influence of hydrolysis conditions and working solution composition on the formation and protective performance of acrylate trialkoxysilane-based organosilicon coatings. The study employed functional trialkoxysilanes with various acrylate substituents and steel substrates used for coating deposition. The coatings were prepared using organosilane solutions obtained through acid hydrolysis. The process of hydrolysis was monitored via thin-layer chromatography using silica gel plates. The morphology and elemental composition of the resulting coatings were characterized using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The protective performance was evaluated using Akimov’s drop test. The research focused on the effects of medium acidity, working solution concentration, and ethanol addition on the hydrolysis and formation of a siloxane layer via metal–oxygen–silicon bonds. The highest hydrolysis efficiency was observed at pH 3, resulting in stable solutions and uniform coatings. The optimal organosilane concentration was found to range from 4% to 7%, which yields the highest degree of uniformity. A correlation was established between hydrolysis conditions, coating morphology, and corrosion resistance. Coating deposition was found to extend the corrosion induction period compared to untreated surfaces. The superior protective performance is achieved at organosilane concentrations of 4–7% and pH 3. The findings highlight the potential of the investigated organosilanes for developing effective primer coatings.

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