ISSN 1070-4272, Russian Journal of Applied Chemistry, 2017, Vol. 90, No. 3, pp. 492−495. © Pleiades Publishing, Ltd., 2017.
Original Russian Text © V.N. Tseluikin, Yu.V. Gold,
2017, published in Zhurnal Prikladnoi Khimii, 2017, Vol. 90, No. 3, pp. 387−390.
Electroplating of metals from suspension electrolytes
containing dispersed particles of various sizes and kinds
results in formation of composite electrodeposited coat-
ings (CECs) [1, 2]. When incorporated in a metal matrix,
particles improve the operation properties of the surfaces
(hardness, wear resistance, protective power, etc.) and im-
part to them new properties (antifriction, magnetic, etc.).
Coatings with the nickel matrix are the most widely used
CECs [1–4]. Nickel-based composite coatings are char-
acterized by high levels of hardness, wear resistance, and
resistance to corrosion media, as well as by good external
appearance [5–8]. Functional properties of CECs are
largely determined by the nature of the dispersed phase
[3, 4]. Carbon nanotubes (CNTs), which are cylindrical
structures formed by rolling-up of planar atomic layers of
graphite (graphenes), show much promise in this respect.
They can be single- or multilayered (consisting of several
coaxial cylinders) [9, 10].
Previously  we prepared nickel–CNT CECs in
the reverse mode and studied their functional properties.
This study was aimed at preparing composite nickel–
CNT coatings from sulfamate electrolyte in the steady-
state mode and at evaluating their tribological properties
and protective power.
An electrolyte of the following composition
) was used for depositing nickel-based CECs:
O 350, NaCl 12, CH
COONa 25, so-
dium dodecyl sulfate 1, and CNTs 0.05. Coatings were
deposited onto a steel support (steel 45) at 45°С with
continuous stirring of the electrolyte. Coatings of pure
nickel were electrodeposited from solution of the same
composition but without the dispersed phase. The adhe-
sion of the coatings was evaluated by the cross-cut test
[GOST (State Standard) 9.302–79].
Experiments were performed with CNTs prepared
by pyrolysis of hydrocarbons with a nickel catalyst. The
CNTs were hollow ﬁ bers built of graphene layers of
fullerene-like structure from 10 to 60 nm in diameter .
Electrochemical measurements were performed
with a P-30S pulse potentiostat. The potentials were
set vs. saturated silver chloride reference electrode and
converted to the hydrogen scale.
Tribological tests were performed in the dry friction
mode. A steel specimen (carbon steel) was used as a
counterbody. The counterbody weight was 1 g in all the
The sliding friction coefﬁ cients of the coatings were
determined using the formula
f = ––– tan α,
is the sliding friction force, and Р is the force
at which the counterbody presses the test surface.
Electrodeposition of Nickel-Based Composite Coatings
from a Sulfamate Electrolyte
V. N. Tseluikin and Yu. V. Gold
Engels Institute of Technology, Branch of the Gagarin State Technical University of Saratov, Engels, Saratov oblast, Russia
Received March 17, 2017
Abstract—Nickel-based composite coatings modiﬁ ed with carbon nanotubes were electrodeposited from a
sulfamate electrolyte. The functional properties (friction coefﬁ cient, protective power) of these coatings were
compared to those of electrodeposited nickel coatings without dispersed phase. Incorporation of carbon nanotubes
into nickel coatings leads to a 1.40–1.45-fold decrease in the sliding friction coefﬁ cient and to a 1.35–1.40-fold
increase in the width of the passive potential range.