The study of the inhibitory ability of inorganic cyclophosphate compositions

Abstract

The article discusses the anti-corrosion properties of inorganic cyclophosphate compositions in relation to St-3
steel, depending on the pH of the medium, the nature and concentration of cyclophosphate, the nature of the modifier ion. The
studies were conducted according to GOST methods. Methods: gravimetry, potentiometry, photocolorimetry, IRS and SEM. On
the basis of experimental data, quantitative indicators of corrosion process were determined: the rate of corrosion process, the
degree of protection, the depth index, the coefficient of inhibition and the assessment of the stability of the formed film on the
ball scale of corrosion resistance against steel. Analysis of experimental data allows to establish the influence of the above factors
on the occurrence of corrosion processes in the studied systems. The experimental data are supplemented by thermodynamic
calculations of the parameters of the corrosion process, the results of which correlate well with the kinetic data of the process
under study. In the course of the research, corrosion sediment analysis was also carried out. The regularities established during
the work contribute to the creation of effective cyclophosphate inhibitors with the highest degrees of protection.