We investigated the adsorption of hexylamine (in its hydrated form, hexylammonium ion) on the solution-platinum interface in 1 M HClO4 in the presence of 0.1 M Fe2+ and 0.1 Fe3+ by potentiodynamic and impedance methods, and also at the solution-air interface by the maximum bubble pressure technique. We show that the physical adsorption of hexylamine at both interfaces is described by the Dhar-Flory-Huggins isotherm equation. The values of adsorption constant and free adsorption energy are close for both interfaces. For the solution-air interface, the hydrophobic effect is the main reason for the surfactant adsorption at this interface. Based on the closeness of the main adsorption characteristics for both interfaces, we suggest that the adsorption of hexylamine on platinum occurs mainly due to the hydrophobic interaction of hexylamine polar molecules with water polar molecules as well. It has been shown that for the solution–platinum interface, the share of the hydrophobic effect is about 60%, and that of the van der Waals interaction is about 40%.
The modified organic wastes of the caprolactam are investigated by potentiodynamic and impedance technique as corrosion inhibitor of carbon steel in 20 mass % hydrochloric acid solutions. It is shown that the investigated inhibitor retards mainly anodic reaction. The corrosion process is simulated by a parallel circuit of constant phase element and the corrosion resistance connected in series with the solution resistance. The inhibition efficiency reaches 92 … 93 % at 1 mass % concentration of inhibitor.
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