ADSORPTION OF METHOXYSILANES ON AN IRON SURFACE AND CORROSIVE BEHAVIOR OF FORMED SURFACES IN A CORROSIVE ENVIRONMENT

The adsorption of RSi(OMe)3 methoxysilanes at the iron surface from th e vapor phase is studied by piezoelectric crystal microweighing, and b y Auger and ESCA spectroscopes. The effect of water concentration on t he formation of siloxane films is investigated. Water adsorption is st udied and corrosion tests are carried out in an environment of synthet ic air with an introduction of sulphur dioxide. Both activation and in hibition of atmosphere corrosion are possible, depending on the siloxa ne synthesis technique, and orderliness and thickness of polymeric fil ms. Thin films (10 - 12 monolayers of siloxane) make the surface hydro phobic and inhibit corrosion. The increase of thickness up to 28 - 35 monolayers increase the water adsorption and iron corrosion rate.