The possibility of precipitation of manganese-containing phosphate coatings of the required quality from a solution at a temperature of 75 °C. investigated. For this purpose, the previously obtained composition for the formation of manganese-containing phosphate coatings was modified, operating at a temperature of 95 °C. It was found that the developed composition at a temperature of 75 °C allows for 15 minutes of the process to obtain coatings of the required quality with a jurealite grain size of up to 10 microns, wear resistance and corrosion resistance properties. The effect of certain electrolyte additives on the mechanical, anticorrosive properties and structure of coatings was studied. A stabilized suspension of ultrafine diamonds with a particle size of up to 100 nm, graphite emulsion grade B1, and addition of PTFE particles grade PN-20 used as additives to the phosphating solution. It is shown that the introduction of all these additives into a modified phosphating solution leads to an improvement in the wear resistance of coatings. Fine crystalline phosphate layers formed from a solution containing PTFE particles detected in an amount of 0.5 g/l have the best wear resistance of the coatings. Recommended the coatings impregnated with oil with a corrosion inhibitor for products with threaded connections.

Atmospheric corrosion of metals is caused by the effects of the environment, particularly humid air. The main factors influencing atmospheric corrosion are humidity (increased humidity accelerates the corrosion process), atmospheric pollutants (gas, dust, etc.), temperature (increased temperature contributes to an increase in the corrosion rate), and some other factors. Atmospheric corrosion can be dry (at low humidity and leads to surface oxidation of the metal) and wet (at high humidity with the formation of a thin layer of water on the metal surface). Atmospheric corrosion can occur by both chemical and electrochemical mechanisms. Various methods are used to protect against atmospheric corrosion, such as the use of anti-corrosion coatings, the application of special oils and varnishes, and the use of corrosion-resistant materials. An effective method of protection against atmospheric corrosion is the use of preservation liquids. In this study, we developed and tested new preservation fluids based on nitro compounds, amidoamines, and salts of natural petroleum acids. The studies were conducted on steel plates in two phases with varying inhibitor concentrations.

The results demonstrate that preservation fluids obtained in the presence of the synthesized inhibitor, nitro compound, and liquid rubber exhibit superior protection of metals from atmospheric corrosion.

The article discusses the measurement of the total electrode potential and the basic patterns of its establishment for heterogeneous corroding alloys with increased corrosion resistance, with the aim of applying the potentiometric method to determine resistance against intergranular corrosion. In order to maintain the reliability criterion of the AMU method according to GOST 6032-2017 the dependence of the resistance of stainless steels to intergranular corrosion and the value of their electrochemical potential on the properties of the environment has been taken into account by using a solution of sulfuric acid and cooper sulfate as the test electrolyte. For the same purpose, the preparation of samples from blanks, their preparation, provoking solution were carried out using the AMU method in accordance with the requirements of GOST 6032-2017.

The functional features of the suspensions used for applying protective electroplating to reed contact parts are investigated. A typical suspension contains two main elements: a magnetic system (MS) and a holder. The requirements for the main structural elements of suspensions that ensure high-quality coatings are formulated.

It is shown that in order to reduce the transient resistance of the reed contact parts, it is necessary to provide a force of pressing them against the base of the holder exceeding 0,07 N. Technical solutions are proposed to achieve the required characteristics of the suspensions:

- modules consisting of strips of magnets 20 mm wide with alternating magnetization; the thickness of the magnetic core in MS does not exceed 2,0 mm, and the distance between the module and the contact parts is 2,0 mm;

• the central part of the base of the suspension holder is 1,0 mm thick, with the thickness of the remaining peripheral part of the base equal to 2,0…4,0 mm;
• guides with a width of 10,0 mm and a thickness of 1,0 mm are fixed on the sides of the surface of the base of the holder facing the MS;
• on the surface of the central part of the holder base there is a permalloy foil with a thickness of 50…100 microns;
• round holes are made in the base of the holder with a thickness of 2,0 mm, in which cylindrical pins made of permalloy are placed.

The use of the developed suspensions provides a 4-5-fold increase in their service life and a ~40% reduction in the total defective reed switches.

The electrochemical behavior of cerium-modified aluminum conductive alloy AlV0.1 in an aqueous NaCl solution was studied by the potentiostatic method at a potential scan rate of 2 mV/sec. The time dependence of the change in the free corrosion potential of the original AlV0.1 alloy and alloys with the addition of cerium show that they shift to the region of positive values. It was found that an increase in the cerium concentration shifts the free corrosion potential, repassivation potential and pitting potential in the positive direction of the ordinate axis. With an increase in the chloride ion concentration in the NaCl solution, a shift in the electrochemical potentials of cerium-doped aluminum conductive alloy AlV0.1 to the negative region was observed. An increase in the chloride ion concentration promotes an increase in the corrosion rate, regardless of the alloy composition. It is shown that the cerium additive reduces the corrosion rate of the aluminum conductive alloy AlV0.1 by 13% in a NaCl solution.