Carbon dioxide corrosion is one of the main problems of gas fields at the present stage of their development. One of the methods for assessing the corrosion aggressiveness of the operating conditions of oil and gas fields is the use of calculation models. Predictive models have been known since the 1970s and were developed mainly for oil fields. Among such models for determining the rates of carbon dioxide corrosion, the most famous are the NORSOK and de Waard-Milliams equations. The experience of Gazprom VNIIGAZ LLC shows that at present, there are no verified models for calculating corrosion rates for carbon dioxide and other aggressive conditions and are not used at gas production, transportation and processing facilities. A comparison of the corrosion rates calculated using the NORSOK and de Waard-Milliams equations showed that they are several times overestimated, which differ significantly from the actual values of total carbon dioxide corrosion at the main gas fields. There is also a difference in the calculated corrosion rates from those obtained by Gazprom VNIIGAZ LLC based on the results of simulation tests. The main differences and discrepancies in the dynamics of changes in such estimated rates of carbon dioxide corrosion from the main aggressive factors (temperature, partial pressure, etc.) are considered. The importance of choosing for obtaining initial data not one, as in the considered predictive analysis models, but several testing methods proposed and practiced by Gazprom VNIIGAZ LLC when assessing the degree of danger of carbon dioxide corrosion in gas fields is emphasized. The main limitations of existing predictive analysis models that do not allow their use at gas facilities are discussed. These include the fact that the calculation models do not allow assessing the danger of local carbon dioxide corrosion, do not take into account the mineral composition of aqueous media, as well as the possibility of formation and properties of corrosion products on steel. It is noted that, according to Gazprom VNIIGAZ LLC, existing models for calculating the rate of carbon dioxide corrosion give significantly overestimated values, are intended for oil facilities and cannot be used at gas facilities. In such conditions, the main method for determining corrosion rates remains simulation tests.

By potentiometry methods and scanning electron microscopy the influence of the compositions of electroless nickel plating solution on the resistance to corrosion damage of Ni–P coatings deposited on the surface of magnesium alloy MA2-1 was studied. It has been shown that, depending on the origin of the nickel salt anion, Ni–P coatings have different corrosion resistance, which in turn is influenced by the morphology of the surface of the formed coating. Ni–P coatings deposited from a sulfuric acid nickel plating solution are more resistant to corrosion damage compared to coatings deposited from a solution containing nickel acetate. This is evidenced by the formation of a small-crystalline structure of the coating from a solution containing nickel sulfate, with a grain size of about 3…5 microns. The highest corrosion resistance is exhibited by Ni–P coatings deposited from a carbonic acid basic nickel plating solution; they are characterized by the lowest grain size of about 1…2 µm and the lowest corrosion current density i_corr = 0.38 × 10^-5, mA/cm².

The article discusses the effects of stray current (BT) on the corrosion of the inner and outer walls of technological pipelines of nuclear power plants (NPP), problems of BT control for overhead pipelines. A non-contact method for localizing impact sites and determining the assessment of the hazards of stray currents in the technological pipelines of NPP is presented, which will be of interest to specialists of enterprises and organizations related to the issues of near-corrosion protection of nuclear power plant structures.

This work proposes a method for synthesizing an amine-containing compound from polyamine (PA-10) and an oxirane series compound (M-10) capable of forming strong, alkaline-stable complexes with Ni²⁺ ions.

The effect of the ratio of the initial monomers for synthesizing the complexing component of the alkaline electrolyte for the process of electrodeposition of zinc-nickel alloy, as well as the molar ratio of Ni²⁺ and the complexing component (PA-10_M1.5) in the solution on the Ni content in the alloy and the appearance of the resulting coatings was studied.

It was established that the optimal molar ratio of the initial monomers ([PA-10]:[M-10]) for the synthesis of the complexing component of the PA-10_M1.5 electrolyte is 1.5:1, and the most promising from the technological point of view is a solution based on PA-10_M1.5 with a molar ratio of nickel ions to the complexing component in the electrolyte of 1:2.

An alkaline electrolyte has been developed for the electrodeposition of protective coatings with a zinc-nickel alloy containing (g/l): Zn²⁺ – 9; Ni²⁺ – 3.5; NaOH – 112.5; PA-10_M1.5 – 31.3, which allows deposition of zinc-nickel alloy coatings containing 12...14 %_wt. nickel on a steel surface at a cathodic current density of 0.5…5.0 A/dm², t = 22…40 °C and mechanical stirring. The corrosion resistance and protective capacity of the obtained coatings were determined.

Lead is a very ductile metal and is widely used in industry both in its pure form and in the form of alloys with other components. The high resistance of lead against corrosion in many mineral acids has led to its widespread use in the chemical industry for lining chemical equipment, pipelines and containers, for hot leading instead of tinning. Lead is resistant to corrosion because a film of hydroxide forms on its surface upon contact with air and a film of lead sulfate upon contact with sulfuric acid.

This paper presents the results of a study of the electrochemical corrosion of lead-copper alloys in an electrolyte medium of 0.03, 0.3 and 3.0% NaCl. Corrosion and electrochemical studies of the alloys were carried out by the potentiostatic method on a PI-50-1.1 potentiostat in a potentiodynamic mode at a potential sweep rate of 2 mV/s. It has been shown that alloying lead with copper increases its corrosion resistance by 15…20%. The main electrochemical potentials of free corrosion, pitting formation and repassivation of the lead corrosion process during copper alloying shift to a positive range of values, and decrease from the concentration of sodium chloride.

The article discusses the factors influencing the mechanism of the adsorption process during corrosion of oil pipelines. Thus, the article considers the influence of the surface area and volume of particles, their dispersion on the adsorption process during corrosion of oil pipelines, the change in the radius of atoms and molecules depending on the volume and surface area of particles, as well as their number in a particle, the stress per unit surface on which adsorption occurs, from the point of view of forces interaction between the adsorbate and the adsorbent, the internal energy on the surface, the Gibbs energy, the change in entropy, the differences in homogeneous and heterogeneous systems, the influence of surface pressure and osmotic pressure, the volume of adsorption layers, the molecular concentration of a substance on the surface, the twodimensional attraction coefficient, the repulsion coefficient, the Henry equilibrium constant, issues of equilibrium pressure, the degree of filling of the surface, the dependence of the mechanism of interaction of two surfaces on pressure, the influence of the chemical potential of the adsorbed substance, the integral equality of heat during adsorption, the influence of surface energy and free energy on adhesion, and also considers the influence of the standard chemical potential on the adsorption process.