Features of Electrodeposition
of NickelChromium Diboride Nanopowder
Composite Coatings

I. V. Nozdrin*, G. V. Galevskii*, M. A. Terent’eva*, and V. V. Rudneva*

Siberian State Industrial University, ul. Kirova 42, Novokuznetsk, Kemerovo oblast, 654007 Russia

*e-mail: kafcmet@sibsiu.ru

Abstract—Conditions for obtaining a nickel-based composite electrochemical coating (CEC) with the use of
the CrB₂ nanopowder as a strengthening phase in a standard nickel plating electrolyte are investigated. It is
established that the nickel matrix is maximally saturated with the use of chromium nanoboride upon its con-
centration in the electrolyte of 5–10 kg/m³, which is lower by a factor of 8–12 than when adding CrB₂
micropowders. The microhardness of the CEC with the Ni–CrB_2(nano) composition with the content of the
strengthening phase of 0.59–0.65% is higher than for the Ni–CrB_2(micro) coatings containing 2.47–2.86% boride
by a factor of 1.16–1.19 and for the nickel host by a factor of 1.64–1.86. The optimal conditions of the CEC
deposition are a cathode current density of 1.0 kA/m², a nanoboride concentration in the electrolyte of 5–10
kg/m³, pH = 5.0–5.5, and a temperature of 323 K.

Keywords: composite coatings, nickel, chromium nanoboride, electrodeposition parameters, microhardness

DOI: 10.3103/S1067821213050076

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