Based on the results of annual corrosion tests at Kon Zo corrosion station, the southern branch of the Tropical Center in Ho Chi Minh City (Vietnam) determined the atmospheric corrosion rates of steel, copper, zinc, and aluminium. The corrosivity of atmosphere of Kon Zo corrosion station assessed in to relation to each metal according to the Methodology of international standard ISO 9223:2012 (Е). Using Dose-Response Functions (DRF) the corrosion rates of these metals for the first year (К1) were calculated with use of meteorological and aerochemical parameters of the atmosphere. A satisfactory correlation between the observed and calculated values for steel, copper and aluminium obtained. This indicates the possibility of using the DRF of international standard for determination the values К1 and corrosivity categories in areas of Vietnam.

The composition and structure of flame-retardant coatings do not provide the required adhesive and protective anticorrosive properties, and therefore it is necessary to use special primers to eliminate these shortcomings. According to the purpose, the primers used for these purposes should have a sufficiently high temperature resistance. The highest resistance to high temperatures, of which polyorganosiloxane oligomers have found application in the field of paint coatings, characterizes Organosilicon polymers. However, coatings based on them, formed without thermal stimulation, are characterized by fragility, unsatisfactory adhesive and barrier properties and, as a result, low anticorrosive efficiency. In order to ensure the chemical structuring of polyorganosiloxane oligomers during the formation of coatings without exposure to elevated temperatures, functional additives were synthesized, which are products of the addition of 3-aminopropyltriethoxysilane to polyesters with terminal epoxy groups of various functionality and structure. The effect of the obtained adducts on the anticorrosive properties and operational characteristics of polyorganosiloxane coatings investigated. The data obtained as a result of the study made it possible to conclude that the branched structure of the hardener contributes to the improvement of the anticorrosive and other operational properties of polyorganosiloxane coatings, and an increase in the distance between the crosslinking nodes increases the level of their chemical structuring. The analysis of the obtained data made it possible to choose the optimal composition and content of the functional additive ensuring the achievement of maximum anticorrosive effectiveness of coatings in combination with high adhesive and physico-mechanical properties without a noticeable loss of their heat resistance.

The work is devoted to the creation of multi-purpose compounds based on organ-ophosphonates (OF) for simultaneous inhibition of salt deposition and corrosion in water use systems. A comparative analysis of the effectiveness of salt deposition and corrosion inhibitors based on OP of various chemical composition and structure and their complexates with zinc and magnesium was carried out. It was found that with an increase in the number of functional groups in the reagent molecule and an increase in the length of the hydrocarbon radical connecting the aminomethylene-phosphone groups, an increase in the kinetic param-eters of nucleation and, accordingly, their efficiency is observed. Zinc and magnesium com-plexonates obtained at a molar ratio of 2.5:1 (OF:Me) were tested as salt deposition and cor-rosion inhibitors. It is established that magnesium complexonates are not inferior to zinc ones. The decrease in the corrosion is due to the formation of a protective film on the metal surface. The formation of a protective film is confirmed by the results of ellipsometric studies (spectral LED ellipsometer SPEL-7LED) and the results of elemental analysis (atomic emis-sion spectrometer with inductively coupled plasma iCAP 6300 Duo).

Expired drugs have been studied as corrosion inhibitors for metals in various environments for more than 10 years. Their similar use is due to the structure of molecules containing unsaturated bonds, aromatic rings and heteroatoms, such as O, N, S, etc., as well as conventional organic inhibitors. In this work, the inhibitory effect of expired drug Omeprazole against carbon steel corrosion in a NACE model stratum water containing 400 mg/L hydrogen sulfide was investigated. The concentration of omeprazole varied within 10…60 mg/L. The studies were carried out by gravimetry, potentiodynamic polarization and impedance spectroscopy methods. The inhibitory properties of omeprazole in the studied medium are estimated as average with a protective effect of 75…80% at the maximum concentration studied. The inhibitor causes a slowdown in both electrode reactions. The adsorption of omeprazole on the steel surface is described by the Langmuir isotherm. The calculated value of the free energy of adsorption (-29 kJ/mol) indicates the chemisorption of the inhibitor.

Erosion of the internal surfaces of pipelines and shut-off valves used in oil production is a very dangerous phenomenon. It occurs as a result of the impact on the metal of mechanical impurities contained in the working environment. Erosion often occurs together with corrosion. The type of destruction under the influence of mechanical impurities is determined by the fluid flow rate, and the intensity and rate of erosion depends on the concentration and composition of mechanical impurities. Solving the problem of effectively determining the degree of adverse environmental impact depending on various parameters requires the development of new approaches, such as modeling. Modeling of hydrodynamics to determine critical flow rates and calculation of expected zones and erosion rates is due to the importance of solving the problem of anti-erosion protection. In this paper, CFD modeling of hydrodynamics and erosive wear of the control valve of the suspension line of the catalytic cracking unit is performed in the ANSYS Fluent software package. The flow velocities are calculated, and the areas affected by critical velocities at which corrosion erosion occurs are also shown. The effect of density and content of mechanical impurities on the erosion rate is shown

The reliability of technical products is determined by their resistance to the influence of the external environment, the natural component of which are destructor microorganisms (bacteria, yeast, microscopic fungi, etc.).
The low efficiency of protecting metals from biocorrosion is largely due to insufficient knowledge of all aspects of the damaging effects of microorganisms. There are no quantitative data on the processes of biodamage of equipment elements in real operating conditions. To date, reliable methods for diagnosing and predicting the durability of metals and their structures under conditions of interaction with wildlife have not been developed.
In this work, an attempt was made to explain the role of biofilms of microscopic fungi as the important factor in the mycological corrosion of metals. The formation and accumulation of a corrosive medium is possible as a result of the metabolic processes of microscopic fungi that form a biofilm. A detailed determination of the mechanism of biocorrosion of metals is a complex scientific problem.
The purpose of this article is to analyze experimental data on the study of aerobic biocorrosion of metals mediated by the metabolic activity of biofilms of bacteria and microscopic fungi.