ISSN 1070-4272, Russian Journal of Applied Chemistry, 2015, Vol. 88, No. 2, pp. 272−274. © Pleiades Publishing, Ltd., 2015.
Original Russian Text © V.N. Tseluikin, A.A. Koreshkova, 2015, published in Zhurnal Prikladnoi Khimii, 2015, Vol. 88, No. 2, pp. 269−272.
AND CORROSION PROTECTION OF METALS
Electrochemical Deposition and Properties of Composite
Coatings Consisting of Zinc and Carbon Nanotubes
V. N. Tseluikin and A. A. Koreshkova
Engels Institute of Technology, Branch of Gagarin State Technical University,
pl. Svobody 17, Engels, Saratov oblast, 413100 Russia
Received February 2, 2015
Abstract—Composite coatings consisting of zinc and carbon nanotubes were electrochemically deposited from
ammonium sulfate electrolyte. The coating deposition process in the potentiodynamic mode and the microstructure
of the coatings were examined. The functional properties (friction coefﬁ cient, protective power) of the composite
coatings, compared to zinc deposits without dispersed phase, were studied. Incorporation of carbon nanotubes
into zinc-based coatings decreases their sliding friction coefﬁ cient by a factor of 1.25–1.35 and the range of pas-
sive state potentials by a factor of 1.6.
Zinc plating is one of the most widely used
electroplating processes. About half of the whole amount
of zinc produced in the world is consumed for deposition
of coatings for corrosion protection of steel items .
The protective power of electroplated zinc deposits can
be enhanced by incorporation of dispersed particles, with
simultaneous improvement of the physicomechanical
properties of the deposits. To this end, composite
electrochemical coatings (CECs) are deposited from
suspension electrolytes [2–4]. The functional properties
of CECs are largely determined by the nature of the
dispersed phase. Composite coatings modified with
nanoparticles of various kinds are being actively studied
today . Carbon nanotubes (CNTs), which are graphite
planes rolled up in cylinders from one to several tens of
nanometers in diameter, show promise as nanomaterial
. The functional properties of CECs are improved even
at a low content of CNTs in the electrolyte (0.05–0.08 g
) [7–9]. Praveen et al.  prepared zinc–CNT CECs
from acid sulfate electrolyte and studied their corrosion
properties. However, data on joint deposition of zinc with
CNT particles from ammonium solutions are lacking.
This study was aimed at preparing zinc–CNT composite
coatings from ammonium sulfate electrolyte and at
evaluating their tribological properties and protective
Electrolyte of the following composition (g L
was used for preparing zinc-based CECs: ZnSO
Cl 200, polyethylenepolyamine 5, and carbon
nanotubes 0.05. The electrochemical deposition of
coatings was performed onto steel support (steel 45)
at 25°С with continuous stirring of the solution. Pure
zinc was deposited from the above electrolyte without
dispersed phase. The adhesion of the coatings was
evaluated by the grid cut method [GOST (State Standard)
The CNTs used in the study were prepared by pyrolysis
of hydrocarbons with a nickel catalyst. The CNTs were
long hollow fibers consisting of graphene layers of
fullerene-type structure. The number of graphene layers
was no more than 30, and their diameter was from 10 to
60 nm .
Electrochemical measurements were performed with
a P-30S pulse potentiostat. The potentials were set vs.
saturated silver chloride reference electrode.