The Effect of Vinyl-Siloxane Nanolayers on the Corrosion Behavior of Zinc

Resumo

The effect of surface siloxane nanolayers on the electrochemical and corrosion behavior of zinc is studied. It is found that surface self-organizing siloxane nanolayers inhibit anodic dissolution of zinc and its corrosion in chloride-containing electrolytes and under atmospheric conditions and can also cause a decrease in the pitting rate on the metal surface. It is established that the inhibiting effect of the vinyl-siloxane nanolayer depends on its thickness. Thus, the surface siloxane monolayer is insufficient for suppressing corrosion processes. Siloxane layers with a thickness above two or three molecular layers most efficiently inhibit corrosion and local dissolution of zinc. At this thickness, the most ordered surface structures are apparently formed. The FTIR method is used to show that the formed surface self-organizing vinyl-siloxane nanolayers on zinc are stable under exposure to sodium chloride solution and preserve strong bonds with the metal surface despite the occurring corrosion processes.