Determination of the Thermodynamic Parameters Characterizing the Adsorption and Inhibitive Propertie |
03.09.2008 г. |
Determination of the Thermodynamic Parameters Characterizing the Adsorption and Inhibitive Properties of Surfactants B. N. Afanas’ev, Yu. P. Akulova, and Yu. A. Polozhentseva St. Petersburg State Technological Institute (Technical University), Moskovskii pr., 26, St. Petersburg, 198013 Russia Received June 23, 2007 Abstract — Equations for calculations of the activity coefficients of surfactants in the surface layer and the Gibbs energy changes due to the hydrophobic effect and associated with the metal–surfactant bond energy were derived. An analysis of data on the adsorption of surfactants at -Fe2O3 and lead showed that the surfactant is an effective corrosion inhibitor when the surfactant–metal bond is sufficiently strong and the activity coefficient of the surfactant in the surface layer is high. This favors the formation of two-dimensional “islets” of adsorbed molecules. PACS numbers: 81.65 Kn DOI: 10.1134/S0033173208020045
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