Structure and properties of nickel-chrome diboride composite electrolytic coatings

The addition, to the CEC based on nickel, of up to 6% fine-dispersion powders of chrome diboride (in their position in the vertical cathode) and of more than 16.4% micropowders (on the horizontal cathode) with subsequent vacuum annealing at temperatures ranging from 400 to 1100°C makes it possible to produce wear and corrosion-resisting coatings of three types: the coatings consisting of a nickel matrix alloyed with chrome, with uniformly distributed inclusions of Ni3B, coatings consisting of an eutectic boride frame filled with a solid solution of chrome in nickel, and coatings consisting of an eutectic boride matrix which contain specially oriented columnar crystals of the boride of complicated composition (Ni2CrB2).