A Correlation between the Inhibition of Acid Corrosion of Iron by a Mixture of Compounds of a Reaction Series and the Polar Properties of Their Substituents

V. P. Grigor’ev^a, V. M. Kravchenko^b†, and V. V. Boginskaya^a

^a Rostov State University, ul. Zorge 7, Rostov-on-Don, 344090 Russia

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^b Research Institute of Physical and Organic Chemistry,
pr. Stachki 94/3, Rostov-on-Don, 344104 Russia

Received July 19, 2005

Abstract — The character of the adsorption isotherm of a mixture of o-hydroxyazomethine derivatives at an iron electrode is insensitive to the total polarity of the substituents in their molecules. The surface coverage of the electrode by adsorbed compounds of this reaction series (RS) does not depend on the number and concentrations of the components of the mixture, provided that their total concentration and the total polarity of the substituents in their molecules are constant. According to the Linear Gibbs Energy Relation, the overall and partial inhibition factors of the acid corrosion of iron in the presence of mixtures of compounds of this RS are determined by the total polarity of their substituents.