Composite coatings of nickel-vanadium-phosphorus-nitride boron

The effect on the micro hardness of nickel - vanadium coatings from the concentration of sodium hypophosphite in the range 10-30 g / l, the concentration of boron nitride from 0 to 50 g / l, and from the temperature in the range of 50 - 90 ° C was studied. The influence of these factors on the rate of coating, the appearance of the coating and the thickness of the coatings was researched. The effect of heat treatment regimes on the micro hardness of coatings is studied. Regressions equations are obtained that allow calculating the micro hardness of coatings when the composition, the temperature of the electrolyte and the heat treatment temperature change. The wear resistance of the obtained composite coating is determined. The composite coating of nickel-vanadium-phosphorus-boron nitride can be recommended for increasing the resistance of deforming tools operating at temperatures up to 600°C. (paper)