Adsorption of Organosilanes on the Surface of Aluminium and the Formation of Organosilane Films to Protect It from Corrosion

Maxim Petrunin,Tatyana Yurasova,Natalia Gladkikh,Ludmila Maksaeva

doi:10.3390/ma14195757

Abstract

Adsorption of diaminesilane (DAS), vinyltrimethoxysilane (VS) on the surface of thermally precipitated aluminium was examined. The use of different adsorption isotherms made it possible to calculate the adsorption heats for DAS and VS. It was determined that chemisorption of these organosilanes occurred on the surface of aluminium. Exposure of aluminium for 60 min to aqueous solutions of organosilanes led to the formation of organosilane films on the surface of the metal. The use of infrared spectroscopy and scanning electron microscopy in the work made it possible to assess the interactions of organosilanes with the metal surface, as well as to determine the structural features of the films and their thickness. Electrochemical and corrosion research methods made it possible to study the protective properties of organosilane films on aluminium.

Highlights

Adsorption of Organosilanes on the Aluminium (Al) and its alloys are used in many applications because they combine lightness with strength
Adsorption of Organosilanes changing the frequency of the quartz resonator after introduction into the solution, and Adsorption of organosilanes on the surface of the aluminium was estimated by changcalculating the change in mass [28,31]
The reversible adsorbed layer was removed from Al when the sample was soaked in water for 10 min and amounted to about 10% of the total amount of adsorbate

Summary

Introduction

Adsorption of Organosilanes on the Aluminium (Al) and its alloys are used in many applications because they combine lightness with strength. They have high thermal and electrical conductivity, reflect light, and are hygienic and nontoxic. Such applications include aircraft engineering, mechanical engineering, shipbuilding, and energetic uses. Pitting corrosion is one of the most dangerous types of metal structure damage; it occurs on metals covered with an oxide film at locations with passive film damage [2,3]. Owing to high metal dissolution rates in local areas, pitting corrosion may eventually result in the failure of the entire structure. Despite efforts to overcome pitting corrosion of aluminium and its alloys over several decades [4,5,6], the development of effective methods to mitigate the pitting corrosion of Al and its alloys is still relevant

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