Title: Formation of surface self-assembled organosilicon nanolayers on carbon steel and its effect on electrochemical and corrosion behavior of the metal

Abstract

With the usiпg Fourier transformed infrared (FT-IR) spectroscopy, scanning electron spectroscopy(SEM) and energy dispersive x-ray spectroscopy(EDX), the adsorption of vinyltrimethoxysilane on the surface of carbon steel from an aqueous solution and surface self-assembled organosilicon nanolayers formation have been studied. The mechanism of formation of the surface self assembled nanolayer is proposed. It has been shown that during adsorption organosilanes interact with hydroxil radicals of a metal surface with Fe-O-Si bonds formation. The effect of organosilicon nanolayers on the electrochemical behavior of carbon steel was studied by obtaining anodic polarization curves. It is shown that the presence on the surface of vinyl and diamine-containing siloxane nanolayers on the surface leads to a significant reduction in the critical passivation current of steel, i.e. surface organosilicon nanolayers contribute topassivation of steel. In addition, it have been found that in the presence of organosilicon nanolayers on a metal surface causes the shift of critical potential of pitting formation of steel to the region of positive values, which indicates the inhibition of localized anodic dissolution of the metal. Accelerated corrosion tests of steel samples in the climatic chamber were carried out and the corrosion inhibiting effect of vinyl-containing surface nanolayers was shown. It have been established that vinyl-containing soiloxane surface self-assembled nanolayer is resistant to anodic polarization action, which usually contributesunifiorm and localized dissoltution of metals. As have been shown by FT-IR spectroscopy, the surface nanolayer is presented on a metal surface after anodic polarization. The results obtained indicateon the stability of siloxane nanolayers to water and corrosion-active components of an electrolyte action and to change of surface morphology due to dissolution of surface metal atoms with the release of metal ions into solution.

Biography

Maxim A. Petrunin is graduated from Lomonosov Moscow State University Chemical Department, Speciality”Chemistry (chemist) in 1985. He completed PhD at the Institute of Physical Chemistry of the Russian Academy of Sciences, Speciality “Chemical resistance of materials and corrosion protection in 1991. Present working as a Head of scientific sector (working group) of underground corrosion nand electrochemical protect. Specialist in Corrosion Monitoring, Stress corrosion Cracking, underground corrosion. Scientific researcher in the field of physical chemistry, electrochemistry, corrosion sciences, formation of functional nanocoatings on metal surfaces.