The copper sulfate electrolyte operation duration effect on the structure and stability of through holes electroplated copper coatings thermal shock is studied. Electrodeposition in a high-frequency reverse mode with rectangular current pulses in the presence of a complex additive makes it possible to ensure uniform distribution of copper in through holes. At the beginning of the copper coatings electrolyte operation a flat crystallization texture with a predominance of atomic planes [220] is observed, it characterized by X-ray diffractometry. As the electrolyte is used, the crystallographic orientation [111] of the electrodeposited copper appears and becomes predominant, resulting in an increase in the surface roughness of the coatings. Since the copper content in the electrolyte remained virtually unchanged during electrolysis according to X-ray fluorescence spectroscopy, the observed texture changes may be related to the consumption of the inhibitory additive gloss-forming component. This assumption is confirmed by cyclic voltammetry. As the concentration of the gloss-forming component decreases during operation, the through holes copper coatings thermal shock resistance decreases.

The paper describes the process and quality of gold coating of metal surfaces in the presence of detonation nanodiamonds (DNDs). A literary and patent review of methods for obtaining composite gold coatings is given, indicating their characteristics and disadvantages. The modes, materials, and methods used in early sources and in this work are described. The behavior of DND in electrolytes and their ionization is given: the interaction between the surface of nanodiamonds and ions in solution. The properties and behavior of the gold-diamond associate in electrolytes and the difference from known additives are described. The influence of temperature, current strength, and pH of the medium on the deposition of a gold-diamond coating is investigated. The mechanism of deposition of the gold-diamond coating and the effect of the type of nanodiamond additive on the characteristics of the gold coating are described. The aim of the work is to increase the mechanical properties of the Au coating (wear resistance and microhardness) with low consumption of DND and using simple technology.

It is sufficient to maintain the concentration of DND in the gilding electrolyte at the level of 0,1…5,0%. There was no bimodal distribution of properties in the coating. DND, being included in the coating, does not worsen its electrophysical properties. The wear resistance of the gold-diamond coating increases significantly, higher current densities can be used, increasing the productivity of gilding baths. In addition, the introduction of DND changes the nature of the dependence of wear resistance on current density and makes it possible to obtain a coating with increased wear resistance.

The article presents the results of a comprehensive study of the immersion silvering process of copper surfaces. The main focus is on studying the effect of ligand concentration on the kinetics of the deposition process and the electrochemical characteristics of the system. The objects of the research were trisodium salt of nitrilotriacetic acid and thiourea in various ratios with silver ions. During the work, the optimization of technological parameters of the deposition process was successfully carried out. The article presents a comparative analysis of the structure of coatings formed from the studied solutions, their thickness, and continuity. The results of the research can be used in the development of technological processes for applying silver coatings in the electronics industry, electronic device manufacturing, and the radio engineering sector.

It is known that industrial aluminum with a high content of iron, silicon and other impurities cannot be used in industry due to its low performance characteristics. Hence, the development of new alloy compositions based on such a metal is a very urgent task. According to the diagram of the state of the Al-Fe-Si system, according to recent data, two triple phases Fe₂SiAl₈ (α) and FeSiAl₅ (β) are in equilibrium with an aluminum solid solution in this system. The third phase FeSi₂Al₄ (γ) is present in silicon-rich alloys and the fourth phase FeSiAl₃ (δ) crystallizes in alloys, rich in iron and silicon. With a higher content of iron and silicon, many other triple phases crystallize. An alloy of the composition AlFe5Si10 was adopted by us as a model alloy and was alloyed with indium.

The article uses the potentiostatic method in the potentiodynamic mode at a potential sweep rate of 2 mV/s to study the electrochemical properties of an aluminum alloy, AlFe5Si10, with indium, in a NaCl electrolyte. It has been found that indium doping is up to 3.0 %_wt. AlFe5Si10 aluminum alloy increases its anodic stability by 50% in the environment of NaCl electrolyte. At the same time, with an increase in the concentration of the alloying component, a change in the positive direction of the ordinate axis of the potentials of free corrosion, pitting, and repassivation of alloys is noted. With an increase in the concentration of chloride ion in the electrolyte, the potentials of free corrosion, pitting formation and repassivation of alloys decrease, and the corrosion rate increases.

Protecting metal parts, process equipment, and agricultural machinery subject to long-term storage from various types of corrosion using mineral oils is one of the most common and cost-effective methods. Using oils alone has little effect on the corrosion rate, as even a thick oil film allows water vapor to pass through in sufficient quantities, intensifying corrosion processes. Therefore, to enhance their anti-corrosion properties, substances with inhibitory effects are added to oils. Particular attention is paid to the development of oil-soluble compounds that exhibit multifunctionality in various environments.