Gas injected or withdrawn from underground gas storage facilities may contain carbon dioxide or hydrogen sulfide, which are corrosive to steel objects. However, until recently, virtually no attention was paid to the danger of internal corrosion in underground gas storage facilities. There have been no targeted studies on the durability of such steel objects that would take into account the peculiarities of their operation. Due to the fact that an important aspect for obtaining reliable data is the correct choice of research methods, methodological approaches have been developed and applied to study the main aggressive factors by analyzing operational parameters in underground gas storage facilities. The main task was to test methods for studying the durability of material design and the composition of sediments formed as a result of exposure of steel equipment and pipelines to corrosive gas components. Further comparison of the obtained data with operational characteristics made it possible to determine the mechanisms of destruction of steel objects in underground gas storage facilities. The study and processing of basic operating conditions (temperature, pressure, hydrogen sulfide and carbon dioxide content), analysis of precipitations using scanning electron microscopy and X-ray diffraction, and metallographic studies of steel were carried out. The methodological approaches proposed by Gazprom VNIIGAZ LLC make it possible to objectively assess the dynamics of changes over time in temperature, pressure and content of hydrogen sulfide and carbon dioxide, followed by the determination of the partial pressures of these gases and a preliminary assessment of the potential corrosivity of environments in underground gas storage facilities. Analysis of pipe or equipment materials makes it possible to determine the degree of influence of microstructure features on the general or local course of corrosion. Studying the morphology of sediments allows us to trace the development of internal corrosion processes. A set of studies carried out by Gazprom VNIIGAZ LLC makes it possible to develop and select the necessary measures to reduce the risk of internal corrosion of steel gas pipelines and equipment of underground gas storage facilities.

Environmentally friendly corrosion inhibitors, also known as «green» inhibitors, have been used for the past decade. In the experiments in the field of corrosion inhibition. Scientific research is actively conducted on the use of expired medicines as «green» corrosion inhibitors of metals and alloys. In this work, the inhibitory effect of the expired pharmaceutical drug Anaprilin against corrosion of carbon steel St3 in 1H sulfuric acid solution was studied. The concentration of the drug varied within 20…80 mg/l. The research was carried out using gravimetry, potentiodynamic polarization, impedance spectroscopy, and electrochemical diffusion techniques. Gravimetric corrosion tests conducted at room temperature and 80 °C showed the protective effectiveness of the drug, reaching 90% at the highest concentration under study. The presence of Anaprilin in the solution causes a slowdown in the anodic partial electrode reaction and a decrease in the capacity of the electrical double layer. The adsorption isotherm of Anaprilin was determined and the change in free energy of adsorption was calculated. Anaprilin reduces the diffusion current of hydrogen through a steel membrane.

The use of biomass (biowaste) as a renewable energy source is of great interest from the point of view of ecology and environmental protection. However, when burning biomass in fluidized bed furnaces, a number of problems are observed: corrosion of convective heating surfaces of boilers, agglomeration of particles of inert material and biomass ash, defluidization, etc.

The article considers the characteristic problems of burning various plant wastes and, in particular, sunflower husks, since this type of biowaste is very common in Russia.

The ways of solving problems that reduce the risk of corrosion damage to boiler heating surfaces, improve the fuel and operational characteristics of biomass are determined. These include preliminary washing of biomass with hot water, torrefaction, rational selection of fluidized bed materials, and a number of others.

The article presents the results of a potentiostatic study of aluminum alloy AlMg5.5Li2.1Zr0.15 type duralumin with lanthanum in an aqueous solution of NaCl with a concentration of 0.03; 0.3 and 3.0 wt. %, at a potential sweep rate of 2 mV/s. The addition of lanthanum to the aluminum alloy AlMg5.5Li2.1Zr0.15 of the duralumin type was 0.01…1.0 wt. %. It has been shown that doping the specified alloy with lanthanum reduces its corrosion rate by 8…13%, which is accompanied by a shift of electrochemical potentials to the region of positive values. An increase in the concentration of NaCl in an aqueous solution contributes to an increase in the corrosion rate of alloys, regardless of their composition, and a shift of electrochemical potentials in the negative direction of the ordinate axis.

The present work highlights the distinctive features of the process of developing an electrolyte for radionuclide nickel plating. The development of electrochemical methods for producing radionuclide coatings is associated with a number of technological and metrological difficulties caused by the radiochemical specificity of the process, such as: the use of depletable electrolytes ultra-diluted in metal, special control of wash waters, a small volume of electrolytic baths coupled with an extremely high price of the isotopically enriched material, the need to obtain special permits and licenses. An electrolyte composition is proposed that allows electrochemical deposition of nickel until the bath is completely depleted in metal, which not only allows precise control over the quantitative characteristics of the deposits, but also avoids the formation of liquid radioactive waste. The paper also demonstrates the feasibility of determining, directly or indirectly, based on direct radiometric monitoring of baths and coatings, such process parameters as the completeness of electrolyte depletion by target metal, the rate of decrease in metal concentration in the solution, the current efficiency for the deposition reaction. Practical material was collected in the process of developing a complex alkaline depletable electrolyte for the precipitation of radioactive isotopes of iron group metals.