The features of cathode reduction of dissolved oxygen and hydrogen ions on corroding surfaces of carbon steel, iron, and copper coated with inhibited protective films were examined. The characteristics of moisture-and oxygen-permeable protective oil compositions were generalized and interpreted. Approaches are proposed that allow explaining the ionic conductivity of such films.Anticorrosive conservation materials have been developed for a very long time. The results have been reflected in many monographs and reviews [1][2][3][4][5][6][7]. High oxygen and hydrogen permeability is characteristic of the individual commercial oils, including those containing factory additive packages [1][2][3][4][5][6][7][8], so that their protective efficacy is low in conditions of atmospheric corrosion of carbon steel. The anticorrosion constituent of the package is designed to protect metal from the aggressive effect of the oil itself and not from the many stimulants of atmospheric corrosion: oxygen, sulfur dioxide, hydrogen sulfide, water, etc. In the last case, additional inhibition of the compositions is necessary. Extensive corrosion and electrochemical studies of the effect of process mixtures and individual compounds on the protective efficacy of oil compositions primarily obtained from industrial I-20A, transformer, and used motor oils have been conducted [9-19]. The effect of the ability of steel St3 to adsorb synthetic fatty a c i d s ( S FA ) [ 9 , 11 , 1 4 ] , a s y m m e t r i c d i m e t h y l h y d r a z i n e d e r i v a t i v e s [ 1 0 , 1 8 ] , m i x t u r e s o f polyamides [13], hexadecylamine [11, 16], carboxylic acid amides [11, 12], IFKhAN-29A [15] and TS additives (product of condensation of ethanol amine with boric acid) [16] from the oil phase on the kinetics of partial electrode reactions was investigated. The results are partially generalized in [20]. The experimental method is described in [15, 16, 21].The oxygen permeability of oil coatings, including inhibited coatings, is so high that the limiting cathode current with respect to oxygen on electrodes with such coatings in comparison to unprotected steel (in neutral chloride media) frequently not only does not decrease but even increases [9][10][11]. This is confirmed by the data shown in Fig. 1 as an example. However, the opposite picture is also possible (Fig. 2). As a consequence, the limiting cathode current is a function of the concentration of the inhibiting additive.These effects have been interpreted as the result of the high solubility of oxygen in oils (Bunsen constant a = 0.03), a change in the thickness of the effective diffusion layer, which is an emulsion of the

In order to simulate the conditions for assessing the protective efficacy

No abstract

Using the methods of gravimetry, potentiodynamic polarization, and impedance spectroscopy, the protective effectiveness of the inhibitory composition INCORGAZ-111 with respect to hydrogen sulfide corrosion of carbon steel St3 in NACE and Samotlor oil field model stratum waters has been studied. Surface coverage is determined on the basis of the electric double layer capacity in presence of the inhibitor. Its adsorption is interpreted using the polylogarithmic isotherm with a big energy gradient of adsorption centers, that indicates linear energy heterogeneity of the surface. The constants of adsorption equilibrium, the energy gradient and the energy dispersion of adsorption centers as well as adsorption free energy were calculated.