At many gas and gas condensate fields, the extracted products contain increased levels of carbon dioxide, which in the presence of condensation or formation water leads to carbon dioxide corrosion on carbon and low-alloy steels, characterized by dangerous local defects. One of the main methods of protecting steel equipment and pipelines at gas facilities from internal corrosion, including carbon dioxide corrosion, is inhibitor protection. The article considers the main requirements for corrosion inhibitors used at gas and gas condensate fields in terms of technological and protective properties. Among the important technological parameters of corrosion inhibitors, the following were studied: solubility in various solvents, emulsion formation, resistance of the commercial form and solutions of inhibitor reagents to low temperatures. They are important both for the possibility of using corrosion inhibitors (dosing, use in real operating conditions, etc.), and for eliminating negative consequences in the processes of processing gas and gas condensate and separating them from the produced fluids. The possibilities of using chemical and physical methods for separating the emulsion «gas condensate - water» formed due to high concentrations of corrosion inhibitors in operating environments have been studied. To reduce the negative impact of emulsion formation, optimal concentrations and modes of application in such conditions of demulsifiers and elevated temperatures, respectively, were studied. To protect against carbon dioxide corrosion, protective properties were studied for two main technologies of applying corrosion inhibitors: constant and variable dosing in working environments. A comparative analysis of the effectiveness of protection against general and local corrosion and the aftereffect of the inhibitor film was carried out under these two modes of inhibitor application.

Cr-nanodiamond, WC, and Ni-P and Ni-W-P alloys were studied as functional coatings for electrosurgical instruments. Model experiments showed that the use of Ni-P (15.6 at.% P) and Ni-W-P (1.4 at.% W; 12.6 at.% P) coatings resulted in a decrease in the depth of thermal damage compared to an uncoated instrument. It was suggested that the functional properties of the coatings depend on a combination of many factors, including microhardness, roughness, and electrical conductivity; however, the contribution of any given factor requires more detailed study.

A distinctive feature of all types of babbitts is their low fatigue resistance index, which can reduce the optionality of bearings. For this reason, the material is used on liners, the design of which provides for their installation in a housing made of ferrous metal (cast iron) or bronze. Inserts with thin walls are installed in the internal combustion engine using bimetal stamping and continuous casting. The service life of bearings is determined taking into account the size of the babbitt layer poured onto the metal base. In this case, the service life of the liner increases as the babbitt layer decreases. It is known that corrosion destroys metal, but it is difficult to imagine how much overall damage it causes. According to experts from various countries, these losses in industrialized countries range from 2 to 4% of the gross national product. At the same time, metal losses, including a mass of failed metal structures, products, and equipment, amount to 10 to 20% of annual steel production. The paper presents the results of an experimental study of the anodic behavior of lead babbitt B(PbSb15Sn10) doped with aluminum from 0.1 to 2.0 wt. %, in an aqueous solution of NaCl. It has been shown that the addition of aluminum reduces the corrosion rate of lead babbitt B(PbSb15Sn10) by 20…30%. With increasing aluminum concentration in the initial alloy, the potentials of corrosion, pitting and repassivation shift to a positive range of values. An increase in the concentration of chloride ion in a NaCl solution promotes an increase in the corrosion rate of alloys, which is accompanied by a shift to the negative region of the main electrochemical potentials of the alloys.

An immersion tin plating solution was developed for depositing the finishing tin coatings onto the surface of the conductive pattern (hereinafter referred to as CPR) of a printed circuit board (hereinafter referred to as PCB). The finishing tin coatings are intended to protect the CPR of a printed circuit board from corrosion in order to ensure good wettability of the surface with solder and to retain the ability to solder and weld for a long time (up to 6 months), and the finishing immersion tin coatings are also intended to ensure coplanarity of the CPR surface. The solution contains (g (ml)/l): Sn²⁺ – 12; CH₃SO₃H – 40; C₃H₅O(СООН)₃ – 300; PEG-400 – 170; CS(NH₂)₂ – 100; Na(H₂PO₂)∙H₂O – 25; Ag⁺ – 0,025. It allows to deposit tin coatings with the required solderability in two stages (at t = 18…25 °С and τ = 1…2 min; and then at t = 60…70 °С; τ = 12…16 min) that do not deteriorate after being held in a steam atmosphere for 4 hours. As the temperature of the working solution increases, so does the thickness of the tin coating, while the crystal structure becomes larger. Preliminary immersion tinning in a cold solution leads to a refinement of the structure of the subsequent layer deposited in a hot solution. The addition of sodium hypophosphite increases the stability and service life of the solution, and improves the reproducibility of the thickness and structure of the coatings. It was found that in silver-doped tin coatings, whisker formation is not observed after 3 months of aging. The maximum operation concentration of copper ions that accumulate during the immersion exchange is 8 g/L, which is comparable to a foreign analogue.

The work is devoted to ensuring safety and increasing efficiency in the most important sectors of the urban economy, which include heat and electricity supply enterprises in the city. The energy supply system includes a complex of power plants and networks that provide consumers in the city with heat and electricity. The organization of heat supply systems is the most difficult for the city authorities, as it requires significant investments in heating equipment and heating networks, directly affects the ecological and sanitary state of the environment, and also has a multi-variant solution.