USE OF CHROMIUM NANOCARBONITRIDE IN NICKEL-BASED COMPOSITE GALVANIC COATINGS

Abstract

In composite galvanic coating (CGC) technology, metal (nickel, chromium, iron, copper, etc.) is crystallized from electrolyte suspensions containing a modifier as an additive. This modifier is typically a powdered substance whose particles are incorporated into the metal matrix forming on the surface of the product. According to the study, improving the characteristics of CGC requires increasing the dispersion level of the strengthening phase and, ultimately, using it with nanoscale particles. This improves the quality of galvanic deposits by reducing porosity and micro-roughness; promotes the formation of a matrix with an equilibrium subgrain structure and a uniform particle content; improves the physical and mechanical properties of the coatings by implementing the effect of dispersion strengthening and reducing internal stresses; and expands the technological capabilities of the CGC production process due to insignificant sedimentation of nanoscale particles in electrolyte suspensions and increased adsorption of ions and other additives. These circumstances predetermine the constant desire of specialists working in the field of CGP technology to use highly dispersed materials, including nanomaterials, as a strengthening phase.