In the present work, the passivation and protective properties of the antirust additive V-15/41 and its composition with 2-mercaptobenzothiazole (2-MBT) on zinc in an aqueous solution of sodium chloride and a borate buffer solution of pH 7.4 are studied. Individually, V15/41 is capable of spontaneously passivating the zinc electrode and ennobling the local depassivation potential in a borate buffer solution with the addition of 0.01 mol/l sodium chloride. In the absence of preliminary cathodic reduction of zinc at Cinh = 4.0…6.0 mmol/l V15/41, water-soluble complex compounds of the dicarboxylate anion with surface metal cations are formed. In the case of using the composition V15/41 with 2-MBT (9:1), the protective effect also increases with an increase in its concentration. The highest passivation properties are possessed by V15/41 +2-MBT (9:1), which at 2.0 mmol/l has a protective effect of 0.10 V. The thicknesses of the forming protective layers of V15/41 and its composition from the inhibited solution were determined using the ellipsometric method. From the results of corrosion tests it follows that V15/41 at C_inh = 1 mmol/l provides a zinc protection degree Z = 44%, and with an increase in C_inh V15/41 the protection degree decreases. The combined use of V15/41 with 2-MBT (9:1) at C_inh = 4 mmol/l provides complete zinc protection against corrosion destruction for 7 days.

Linear polarization resistance (LPR), voltammetry, and gravimetry methods used to determine the rate and nature of corrosion of 12X18H10T steel and EP760 alloy (KHN65MVU) at 300…500 °C in a KAlCl₄ and ZrCl₄ melt designed to produce zirconium by extractive rectification. The corrosion rate of 12X18H10T steel in an aerated salt melt at temperatures up to 450 °C is extremely high and can exceed 100 mm/year. The use of argon purging and aluminum melt purification can significantly reduce the corrosion rate of 12X18H10T steel and EP760 alloy in a chloride melt. The automatic LPR method used for corrosion monitoring of 12X18H10T steel and EP760 alloy in chloride melts at temperatures up to 450 °C. The use of the Tafel extrapolation method in the classical version is difficult due to an increase in the surface roughness of the electrodes, the duration of measurements, and the dependence of the corrosion rate on the exposure time.

The possibility of electrochemically forming highly filled composite electrochemical coatings Ni-Al with an atomic ratio of components close to the optimal (1:1) from an electrolyte based on a deep eutectic solvent of choline chloride urea is demonstrated. Aluminum was introduced into the electrolyte in the form of ASD-4 powder. The aluminum additive in such an electrolyte is resistant to oxidation over a long period of time, which ensures the stability of the Ni-Al coating composition. Data on the elemental and phase composition of the Ni-Al electrochemical coatings indicate the potential for their use as high-energy composites. Aluminum is included in the coatings primarily in a metallic, unoxidized state. Both metals are contained in the coatings primarily in the elemental state; intermetallic compounds of nickel and aluminum are not detected. Carbon and oxygen impurities detected in the Ni-Al coatings are associated with the inclusion of components of the deep eutectic solvent and/or products of their electrochemical transformation, in particular, in the form of nickel carbide, in the cathode deposit.

This work is devoted to the development and study of the anticorrosive properties of preservation fluids based on salts of natural petroleum acids (NPA) and amidoamines for the protection of metal structures from atmospheric corrosion. The preservation fluids were prepared by adding synthesized Co, Ni, Zn, Mn, and Ba salts of NPA metals isolated from a mixture of Baku crude oils in a two-phase aqueous-hydrocarbon medium and amidoamines to T-30 and T-22 turbine oils. It was shown that the protective effect increases with an increase in the concentration of the studied NPA salts from 5 to 10% by weight. The best results were obtained with the addition of NPA cobalt salt to T-30 turbine oil. It was found that, to create more effective preservation fluids, it is more practical to use amidoamine compositions with salts of synthesized NPA as inhibitors.

This review analyzes the application of sacrificial anode cathodic protection and sacrificial anode diode-assisted cathodic protection systems for oilfield equipment under stray current conditions. It examines theoretical foundations, sources of stray currents, advantages and disadvantages of sacrificial anode diodeassisted systems, practical examples, and alternative protection methods.