SYNTHESIS OF ELECTROLYTIC TERNARY ALLOYS WITH HIGH MICROHARDNESS

Electrodeposition of electrolytic alloys consisting of metals of the iron subgroup and zirconium allows obtaining a coating with a unique combination of physical and chemical properties that cannot be achieved by other coating methods. One of the reasons limiting the use of electrolytic coatings based on such alloys is the complexity of process control process and composition forecasting. The properties of alloys of the iron subgroup containing refractory metals and their composites depend not only on the chemical composition, that is, the content of the refractory component, but also on the deposition conditions. Varying the polarization current density allows the deposition of coatings of different composition and, accordingly, different functional properties. The aim of the work was to study the influence of electrolysis parameters on the chemical composition, structure, surface morphology and physical and mechanical properties of CoNiZr ternary alloy coatings. The formation of CoNiZr ternary alloys from citrate electrolyte on the copper surface in pulse mode was studied. The influence of electrolyte pH, mixing and current density on the composition, surface morphology and current yield and microhardness of ternary electrolytic alloys of the iron and zirconium subgroup was determined. The resulting coatings are characterized by a uniformly developed surface without cracks and sufficiently high and reproducible microhardness. Based on the results of the experiments, it can be concluded that the zirconium content does not affect the microhardness of the CoNiZr coating, but depends on the conditions of electrolysis and the properties of the electrolyte. Based on the conducted studies to determine the influence of electrolysis parameters on the microhardness of electroplated coatings, it was found that the properties of ternary CoNiZr coatings depend on the pH of the electrolyte, temperature and pulse current density. The conducted studies allow us to determine the conditions for obtaining high-quality coatings with specified functional properties.