E. D. Tanygina

To assess the corrosion rate of pipelines, corrosion and potentiodynamic studies of the behavior of St3 steel in soil aqueous extracts were conducted and c

In order to assess the corrosion rate of pipelines, corrosion and potentio-dynamic studies of the Ct3 steel behavior in aqueous soil extracts have been carried out in comparison with ones in 0.5 M NaCl solution. In the saline solution the corrosion rate of steel is often lower than in soil extracts, and it is probably that the organic substances in the studied soil samples are not inhibitors of underground Ct3 steel corrosion. There is some discrepancy between the corrosion rates calculated on the basis of gravimetric tests and polarization measurements. A comparison of the corrosion rate of steel in aqueous soil extracts with the one according to model representations indicates a limited applicability of the models under the consideration to real objects.

The absolute majority of modern studies dealing with the interpretation of experimental data on the basis of the Freundlich isotherm ignore the fact that the data obtained for regions of low and moderate adsorbate concentration/pressure can be analytically continued within the Freundlich adsorption model to the adsorptive saturation area with coverages tending to 100%. Needless to say, this would give valuable extended information about the corresponding adsorption process. This message proposes a framework to comprehensively analyse experimental data first recognised as complying with the Freundlich adsorption model. An algorithm-driven method is presented which enables one to translate the data obtained in the area of small and moderate the coverages of the area of adsorptive saturation regime. As examples, three sets of experimental data for adsorption of mercury (II) on N-rich porous organic polymers and of protein on carrier nano-Mg(OH)₂ have been processed and presented according to the framework developed.