Gas injected or withdrawn from underground storage facilities is characterized by the presence of corrosive carbon dioxide and hydrogen sulfide (from associated petroleum gas from oil fields or coal seams). In such environments, in the presence of moisture, conditions will arise for carbon dioxide or hydrogen sulfide corrosion to occur. However, there have been no previous studies of the problems of internal corrosion at underground gas storage facilities, despite their widespread distribution (PJSC Gazprom operates 23 such gas storage facilities in Russia). According to Gazprom VNIIGAZ LLC, it is incorrect to use tests in the vapor phase for such conditions (without contact of the metal with the aqueous environment), which leads to underestimated corrosion rates, not reflecting the real corrosion situation in underground gas storage facilities. The same erroneous results are obtained by using models (programs such as Norsok or others) to calculate the theoretical corrosion rate of steel used in underground gas storage facilities, because they were developed for completely different conditions of carbon dioxide corrosion on oil pipelines. The only correct way to obtain reliable corrosion data is to conduct model corrosion tests. Based on the results of the analysis of operational parameters and the research carried out by Gazprom VNIIGAZ LLC, it was determined that the most optimally simulate the aggressiveness of the environments of underground gas storage facilities are 2 types of tests - under conditions of moisture condensation on the metal and under conditions of variable wetting of the steel surface on a corrosion test bench developed by us. Simulation tests carried out by Gazprom VNIIGAZ LLC showed an increased rate of internal corrosion of carbon and low-alloy steels (up to 1…4 mm/year) with corrosion-hazardous parameters typical for underground gas storage facilities. During testing, increased localization of carbon dioxide and hydrogen sulfide corrosion is observed. Under such corrosive conditions, the main methods of protecting underground gas storage facilities will be either the use of corrosion inhibitors or the replacement of material design with corrosion-resistant steel.

In this article, a electrolyte composition for obtaining black decorative coatings on wrought aluminum alloys by plasma-electrolytic oxidation is proposed. The mechanisms of the highest anticorrosion ability of relatively thin coatings (approximately 17 μm) at relatively short (24 h) exposures in an aqueous solution containing chloride ions, and thick coatings (48, 82 μm) - at long exposure times in this solution, are proposed.

When creating new materials designed to work in particularly harsh conditions, the task arises of imparting corrosion resistance to them, the practical solution of which is associated with the level of knowledge in the field of protecting metals from corrosion. When using conductive aluminum alloys to make thin wire, such as winding wire, etc. certain difficulties may arise due to their insufficient strength and a small number of kinks before failure. In recent years, aluminum alloys developed that, even in a soft state, have strength characteristics that allow them to be used as a conductor material. One of the conductive aluminum alloys is E-AlMgSi («Aldrey»), which belongs to heat-strengthened alloys. It has high strength and good ductility. This alloy with appropriate heat treatment acquires a high electrical conductivity. Wires made from it used almost exclusively for overhead power lines.

The paper presents the results of a study of the anodic behavior of the aluminum conductor alloy E-AlMgSi with cadmium, in an electrolyte medium of 0,03; 0,3 and 3,0% NaCl. The corrosion-electrochemical study of the alloys was carried out by the potentiostatic method on a PI-50-1.1 potentiostat at a potential sweep rate of 2 mV/s. It has been shown that alloying the E-AlMgSi aluminum alloy with cadmium increases its corrosion resistance by 20%. The potentials of corrosion, pitting formation and repassivation of alloys when alloyed with cadmium shifted to the positive range of values, and from the concentration of sodium chloride in the negative direction of the y-axis.

The results of long-term corrosion tests of 17GS pipe steel samples under field conditions at a specially equipped landfill using a pipe with a diameter of 1220 mm are presented. It is established that seasonal freezing of the soil does not have a noticeable effect on the flow of currents of corrosive macroparticles of differential aeration. The redistribution of the loss of mass of samples due to the flow of macroparticles of differential aeration in high-resistance soils of the taiga–swamp zone of the central part of Western Siberia does not exceed 2…5% of the total loss of mass of samples, which indicates that the currents of corrosive microparticles are most effective in these conditions.

Based on the results of long-term corrosion tests, it was found that when the cathodic protection current density is equal to the oxygen limit current density, with cathodic polarization of 0,15…0,30 V, the residual corrosion rate due to the effect of self-regulation of cathodic protection on all samples decreases to values not exceeding 0,005…0,010 mm/year, although in the absence of cathodic The corrosion protection rates of these samples under various oxygen delivery conditions were 0,08…0,13 mm/year. It is shown that the ratio of the cathodic protection current density to the oxygen limit current can serve as the decisive criterion for choosing the optimal cathodic protection modes, which allows determining the residual corrosion rate of steels in express mode under various cathodic protection modes and reducing the cathodic decomposition reaction of water with the release of hydrogen on the protected surface to a controlled minimum.

Understanding the process of lanthanide (co)deposition is an important step towards the possibility of their efficient recycling and the electrochemical formation of lanthanide-based materials. Growing interest in organic ionic systems such as ionic liquids is due to their excellent physicochemical properties, particularly nonvolatility, thermal and electrochemical stability. In addition, organic ionic systems can be used for the extraction of lanthanides. Thus, the combined process of extraction and electrodeposition has good prospects to practical purposes. In this work, we investigated the electrochemical (co)deposition of lanthanum and cobalt from trimethyl phosphate (TMP)-based solutions. It was shown that during cathodic polarization of a Pt electrode in a solution of Co(II) in TMP, a granular deposit of Co is formed, while no deposition of La was observed in a solution of La(III) in TMP. Nevertheless, voltammetric, microscopic, and elemental analysis data indicate that electrochemical codeposition of Co and La occurs in a solution containing both La(III) and Co(II). It is concluded that the presence of Co(II) in TMP induces the electroreduction of La(III) ions.