Electrodeposition of composite coatings based on nickel nanoand micron chromium boride powders
Conditions of electrodeposition and the main characteristics of composite coatings based on nickel nano- and micron chromium boride are investigated in the paper. Technological feasibility of the reinforcing phase in the form of a nanopowder, which reduces the electrolyte-suspension concentration, increases the cathodic current density and microhardness of coatings is stated. High microhardness of the Ni - NP CrB2 coatings with relatively low levels of the hardening phase in the coating provides its significantly lower consumption per 1 m2 of the treated surface and allows retaining valuable properties of the matrix. A low concentration of powder in the electrolyte simplifies the operation of electroplating baths and reduces the loss of chromium diboride by the electrolyte transport with the parts. The presence of chromium diboride, enhances the electrolyte performance by increasing the upper limit of the cathodic current density.