STUDY OF THE INHIBITORY ABILITY OF INORGANIC PHOSPHATE COMPOSITIONS IN THE PRESENCE OF SURFACTANTS

Abstract

The article deals with the anti-corrosion properties of inorganic phosphate compositions in relation to St-3 steel, depending on the concentration, the nature of the phosphate component in stationary conditions in the presence of surfactant. The studies were con-ducted according to State Standards. Methods: gravimetry, potentiometry, conductometry, photocolorimetry. On the basis of experimental data, quantitative indicators of the corrosion process were determined: the rate of the corrosion process, the degree of protection, the depth index, the braking coefficient. The analysis of experimental data allows us to determine the dependence of changes in the quantitative parameters of the process on the concentration, the influence of the nature of the phosphate ion, the presence of surfactant on the stability of the protective film formed on the metal surface. It was found that among individual phosphate systems, the most high anticorrosive effect manifests orthophosphate sodium. The strength of the protective film depends on the ratio of the components in the systems under study. The inhibitory ability of phosphate compositions increases in the presence of surfactant. With the increase in the hydrogen index of the medium and the general mineralization, the protective effect increases. Along with experimental data, calculations of thermodynamic parameters of the corrosion process were carried out.

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