Study of the Mechanism of Action of the Isopropanol Extract of Rapeseed Oil Cake on the Atmospheric Corrosion of Copper

摘要

The results of gravimetric and electrochemical polarization investigations demonstrate that the isopropanol extract of rapeseed oil cake can be used as an efficient volatile inhibitor of the atmospheric corrosion of copper. The efficiency of action of the surface film in the course of its formation depends on the composition of the gas-vapor phase and, under the conditions of wetting of the metal surface, the corrosion rate is determined by the rate of the cathodic process of reduction of the atmospheric oxygen. In estimating the adsorption activity of organic molecules according to the indices of reactivity and in studying the morphology of specimen surface, we assume that the efficiency of action of the isopropanol extract in the initial stage is caused by the chemisorption of volatile organic components of the rapeseed oil cake, which then interact with each other and transform into surface phase films containing copper ions, water, and organic substances.