The Formation of Self-Organizing Organosilicone Layers on a Carbon Steel Surface and Their Effect on the Electrochemical and Corrosion Behavior of the Metal

Resumo

Adsorption on the carbon steel surface of vinyl trimethoxysilane and γ-aminopropyl triethoxysilane from aqueous solution is studied using the methods of Fourier-transform infrared spectroscopy, scanning electron microscopy, and energy dispersive X-ray spectroscopy. A mechanism of surface layer formation is suggested. It is shown that in the course of adsorption silanes interact with hydroxyl groups of the metal surface with formation of Fe–O–Si bonds. The effect of organosilicone layers on the electrochemical behavior of steel is studied. It is found that the potential of pitting formation of steel is shifted in the presence of organosilicone layers into the range of positive values, which points to inhibition of local anodic dissolution of the metal. Accelerated corrosion tests of steel samples in a climatic chamber are performed, and the corrosion-inhibiting effect of vinyl- and amino-containing surface layers is shown.