Based on the experience of the operating organizations and results of previous studies, it is determined, that the more rational criterion for the withdrawal in the repair of insulation coating on the section of the pipeline is the reserve of the current from the nominal value, and the criterion of withdrawal in the repair of anode grounding is a reserve of voltage from the nominal value. It has been revealed that with data on changes in the output parameters of the cathode protection station and protection potential at the control point for a certain period, it is possible to predict the change in the factor of influence of the station at this point for a certain period and, therefore, to predict changes in the modes of operation of this station and the technical condition of the anti-corrosion protection system at the specified required range of maintenance level of protective potential. Based on the above conclusions, algorithms have been developed to assess the residual resource of the anti-corrosion protection system on the gas pipeline site and make management decisions on its extension based on the received values in the conditions funding restrictions. Also, an algorithm has been developed to determine the residual resource of the anti-corrosion protection system with the most effective redistribution of parameters between the cathode protection stations and an algorithm that allows to determine the priority of output in the repair of the system elements

Oxy- and petroleum acids were synthesized by liquid-phase oxidation of naphthen-paraffin concentrate, separated from diesel fraction of Azerbaijani oils mixture with atmospheric oxygen in the presence of heterogeneous catalytic systems. As the catalyst aluminum nano-oxide modified by Cr ,Co, Mn transition metals was used. The oxidation was carried out in reactor of bubble type in the interval of temperature 135…140 ºС during 5 h. Their imidazoline derivatives were obtained by the use of the synthesized acids and polyamines, and the complexes were prepared on the basis of them and aliphatic monobasic acids (formic and acetic) at equal molar ratio. Their influence was studied on the kinetics of the corrosion process of C1018 steel samples in 1% solution of NaCl, saturated by CO2 at 50 °С. The complexes were tested as inhibitors of carbon dioxide corrosion at concentration of 25 and 50 ppm in 20 h. According to obtained data, the usage of different concentrations of complexes decreases corrosion rate and metal loss (up to 9…10 times). The values of surface coverage (θ) and the extent of inhibition efficiency (IE, %) of corrosion process of steel example in CO2-medium in presence of prepared complexes were calculated. IR spectra of surface layer of used electrodes were recorded before and after adding prepared complexes into corrosion medium. As a result of the studies it was determined, that the obtained complexes had high prospects for use (protection degree 97…98%) as CO2-corrosion inhibitors in suppressing of carbon dioxide corrosion of steel equipment

Known methods for applying an inorganic composite coating are accompanied by its heat treatment at a temperature of at least 300 °C, which requires the use of furnaces. Recent developments have allowed to reduce the temperature of heat treatment to 90 °C for at least 3 hours or to 105 °C for at least 1 h, which allows the use of portable heating equipment. However, the use of any equipment with such prolonged heat treatment is not acceptable when applying corrosion protection to large structures, especially when their dismantling is impossible. The results of studies on the chemical curing of an inorganic composite coating that does not require heat treatment are presented. It is proposed to spray a hardener solution onto a composite coating having a more alkaline pH instead of heat treatment. When a hardener reacts with acidic residues of an inorganic binder on the surface of a dried coating, monosubstituted phosphates undergo a transition to poorly soluble two- and practically insoluble tri-substituted phosphates not only on the coating surface, but also on the inner surface of the pores, which leads to almost complete insolubility of the coating. Treatment of the coating with an aqueous solution of monosubstituted potassium phosphate, two-substituted potassium phosphate or potassium pyrophosphate gives the coating water resistance. The inorganic composite coating acquires a high protective ability (more than 1300 hours in a salt fog chamber) on steel parts after treatment with only aqueous solutions of mono-substituted or two-substituted potassium phosphate

Using the gravimetric method, the inhibitory efficiency of the combined inhibitor with respect to hydrogen sulfide and carbon dioxide corrosion of St3 steel in model produced water MI was studied. Corrosion tests were carried out in 0,5 liter sealed vessels on St3 samples of size 30х20х1.
Gossypol resin + MARZA was used as a multifunctional combined inhibitor. Diesel fuel and kerosene were used as solvent. It has been established that the protective effect of using a multi-functional combined inhibitor in formation water with oil containing hydrogen sulfide and carbon dioxide using kerosene as a solvent ranges from 75 to 96 and for diesel as 80 to 100.
The combined inhibitor allows to achieve in the MI medium containing hydrogen sulfide and carbon dioxide in the process of daily testing the corrosion rate of steel is about 0,04 g/m2·h. only in a concentration of not less than 70 mg/l. However, with an increase in the duration of the test by an order of magnitude, a similar corrosion rate is observed already at an inhibitor concentration of 50 mg/l. The same is characteristic of carbon dioxide and hydrogen sulfide - carbon dioxide solutions.

The territory and its natural frame are the arena of all chemical, biological, technical interactions and processes, and the wind and rain are their natural propellers. The cartographic image of space, as an integral indicator of processes, phenomena, carries the function of a guide mark in the basis of control and regulation of durability and protection of structures in the natural frame. This article presents the results of a city life support system simulation in the light of the concept of forecasting and managing the risk of the danger of air pollution, including in the practice of anti-corrosion protection. Monitoring of the surveillance and control system grows into the life support system of the territory. “Technologies at a glance” provide: an assessment of the fields and halos of danger from air pollution (real and predicted state maps), modeling “alive geofilters”, namely, purification methods, preventive protection measures, formation of city breeze corridors or wind tunnels

The corrosion and mechanical properties of the oil catalytic cracking reactor vessel made of stainless steel Y1-T (1X18N9T) after its operation for more than 60 years have been determined. The chemical composition of the reactor metal meets the requirements of GOST and involves the isolation of non-metallic inclusions of manganese sulfide in its structure, which cause the development of pitting, and chromium carbides, which are responsible for the propensity to intergranular corrosion. After long-term operation, the mechanical characteristics of the metal (tensile strength σb, yield strength σt, elongation δ, relative contraction Ψ), determined using cylindrical samples at a temperature of 20 °C (GOST 1497-84) and at an operating temperature of 465 °C (GOST 9651), on the breaking machine TC 110M-50, correspond to the standard values. Metallographic studies carried out using an optical microscope “Axio Observer Z1m « at magnifications of X25, X75, x125, X200, X250, X400, X500, x1000, X2000 showed that long – term operation of the metal at a temperature of 375…425 °C with periodic overheating up to 550…650 °C leads to the release of excess phases, namely, chromium carbides and titanium carbonitrides. The metal grain boundaries are enriched with Cr23C6 carbides, which cause a loss of resistance against intergranular corrosion. Corrosion pitting and weakened metal grain boundaries are promoters of the occurrence of corrosion cracks. The most dangerous areas of large-size equipment are welded joints and zones of thermal influence. A mandatory condition for fire and explosionproof operation of the refinery is periodic diagnostics of the corrosion state of the equipment in order to identify and timely eliminate potentially dangerous areas, the probability of which breaching with subsequent spillage and fire of oil and petroleum products is the highest.

Analysis of publications is presented on studies of organic steel corrosion inhibitors in environments with hydrogen sulfide with the participation of microorganisms. A relationship is identified between the structure of organic compounds and the composition of their molecules and their efficiency in inhibition of steel corrosion. The effect of organic compounds (phenols, ketones, and quinones) on the metal corrosion process is discussed. A decrease in the rate of cathodic or anodic processes is studied, as dependent on the structure of molecules of organic compounds and pH of the medium. The choice of inhibitors for suppression of corrosion with participation of microorganisms is considered with account for the specificity of their action on a given microorganism and duration of their inhibiting properties: they must not be activated by other substances in the medium, the microorganism must not develop resistance. The mechanism of action of the inhibitor depends on the composition of its molecules, the nature of the corrosive medium and metal. The general stage is the adsorption of its molecules on the metal, depending, in the first instance, on its electronic structure that determines the possibility of chemisorption on the metal surface, as well as on the charge of the metal surface and particles of organic compounds acting as corrosion inhibitors.

Corrosion resistance properties, such as porosity, stability in the atmosphere of NaCl mist, and anodic electrochemical activity in a sulfuric acid solution are studied and compared for Ni-W-P and Ni-P coatings obtained by electroless deposition. The studied coatings were obtained from solutions with glycine as the main ligand and contained 10.2 to 15.6 at.% of phosphorus and up to 3.3 at.% of tungsten. It is shown that Ni-W-P coatings with a tungsten content of 2.3 to 3.3 at.% and a thickness of 15 μm have a significantly lower porosity as compared with nickel-phosphorus coatings of the same thickness. Also, significantly better stability of Ni-W-P coatings in a NaCl mist atmosphere was observed, their corrosion damage degree is less than that of Ni-P coatings, and relatively little depends on the duration of exposure in a corrosive environment. Analysis of anodic polarization curves showed an almost similar electrochemical activity upon dissolution of Ni-P and Ni-W-P coatings in sulfuric acid. Both these types of electroless coatings showed a markedly better tendency to anodic dissolution than pure nickel. Taking into account the obtained experimental data, a conclusion is made as to the better protective characteristics of Ni-W-P coatings in comparison with nickel-phosphorus coatings. The main reason of the inferior protective properties of Ni-P coatings is their relatively high porosity.