ISSN 1070-4272, Russian Journal of Applied Chemistry, 2014, Vol. 87, No. 10, pp. 1575−1578. © Pleiades Publishing, Ltd., 2014.
Original Russian Text © K.V. Murzenko, V.I. Balakai, 2014, published in Zhurnal Prikladnoi Khimii, 2014, Vol. 87, No. 10, pp. 1531−1534.
of the Zinc–Boron–Polytetraﬂ uoroethylene
Composite Electrolytic Coating
K. V. Murzenko and V. I. Balakai
Platov South-Russian State Polytechnic University (Novocherkassk Polytechnic Institute), ul. Prosveshcheniya 132,
Novocherkassk, Rostov oblast, 346428 Russia
Received June 9, 2014
Abstract—The inﬂ uence of the electrolysis conditions and concentration of the doping component in the elec-
trolyte on the corrosion resistance, microhardness, wear, internal stress, porosity, and adhesion of the zinc–bo-
ron–polytetraﬂ uoroethylene composite electrolytic coating was studied.
The use of composite electrolytic coatings (CECs)
based on zinc and its alloys is suggested for enhancing
the corrosion resistance of parts of machines and
Electrolytes for applying zinc-based alloys and CECs
surpassing zinc coatings in the corrosion resistance have
been reported [1–3].
Particular attention is given today to hydrophobic
materials and coatings. The hydrophobic properties can
be imparted to a surface by incorporating polytetraﬂ uoro-
ethylene (PTFE) into the electrolytic coating. In addition,
PTFE is a chemically resistant material.
Because PTFE is a dispersed and electrically neutral
substance, the electrolyte should be continuously stirred
to involve PTFE into the electrolysis, so as to ensure the
suspended state of PTFE and its mechanical transport to
the cathode surface. On the other hand, charge can be
imparted to PTFE particles under the action of surfactants
introduced into the electrolyte. In this case, the particle
transport to the cathode surface occurs under the action
of electrophoresis. In the process, the PTFE particles are
ﬁ xed on the support surface and are overgrown by the
The water-repelling properties of such surface increase
with an increase in the PTFE content of the coating.
Preparation of hydrophobic coatings is of principal
importance in the development of corrosion-resistant
materials and coatings, e.g., in CEC deposition.
The presence of finely dispersed PTFE in the
electrolyte allows electrolytic deposition of highly
corrosion-resistant CECs based on zinc–boron alloy.
The corrosion resistance is enhanced owing to changes
in the deposit structure and to the fact that the PTFE
that has been incompletely overgrown on the coating
surface reduces the electrochemical corrosion of zinc. The
corrosion rate decreases owing to a decrease in the true
surface area of zinc on the support surface and to the fact
that PTFE exhibiting high surface tension “repels” water,
and the electrochemical corrosion occurs only when a ﬁ lm
of a conducting medium is present on the metal surface.
In this work we studied how the electrolysis conditions
and the concentration of the doping component in
the electrolyte influence the corrosion resistance,
microhardness, internal stress, porosity, and adhesion of
zinc–boron–PTFE composite electrolytic coatings.
To enhance the corrosion resistance of zinc-based
coatings, deposition of CECs based on zinc–boron alloy