ISSN 1070-4272, Russian Journal of Applied Chemistry, 2006, Vol. 79, No. 7, pp. 1105!1109. + Pleiades Publishing, Inc., 2006.
Original Russian Text + Zh.I. Bespalova, Yu.A. Lovpache, M.S. Lipkin, L.G. Miroshnichenko, I.A. Pyaterko, Yu.D. Kudryavtsev, 2006, published in
Zhurnal Prikladnoi Khimii, 2006, Vol. 79, No. 7, pp. 1115!1119.
AND CORROSION PROTECTION OF METALS
Composite Coatings Based on Copper Oxides
Electrodeposited from Solutions and on Polymers
Zh. I. Bespalova, Yu. A. Lovpache, M. S. Lipkin, L. G. Miroshnichenko,
I. A. Pyaterko, and Yu. D. Kudryavtsev
South-Russian State Technical University (Novocherkassk Polytechnic Institute), Novocherkassk,
Rostov oblast, Russia
Received August 4, 2005; in final form, January 2006
Abstract-The possibility of obtaining composite coatings consisting of metal oxides deposited from solu-
tions with an asymmetric ac current and of a polymer was studied. Protective properties of the composite
coatings were examined.
Of particular interest among composite coatings are
metal3polymer coatings (MPCs) in which fluoropoly-
mers are used as the polymer component . Incor-
poration of fluoropolymer particles in the metallic
matrix imparts to an MPC antistatic, antiadhesive, and
anticorrosive properties, but it retains metallic proper-
ties (high thermal and electrical conductivity and wear
resistance) and has a good adhesion to the substrate.
Much promise is shown by composite MPCs in
which oxides obtained using an asymmetric ac current
serve as the matrix. Application of a nonstationary
method of electrodeposition of metals opens up wide
opportunities in control over the structure and, accor-
dingly, properties of deposited metallic films .
The goal of the study was to obtain composite
MPCs on the surface of St.3 steel and to examine the
protective properties of these coatings. A composite
MPC had the form of a porous matrix composed of
copper oxide formed by deposition from solution with
an asymmetric ac current, rather than by oxidation of
the base metal in the course of electrolysis, and was
filled with fluoroplastic.
Copper oxides were deposited from solutions con-
taining copper(II) sulfate, chromium(VI) oxide, boric
acid, and 1,4-butanediol under polarization with an
asymmetric ac current of mains frequency in the form
of two half-sinusoids with different amplitudes.
A device  that comprised two diodes connected in
parallel and conducting current in different directions
via adjustable resistors served as a current source. As
the cell served a glass vessel in which the St.3 steel
working electrode with a surface area of 12 cm
placed together with lead (or copper) counter elec-
trodes in sheaths, thermometer, and magnetic rabble.
The electrode surface was prepared using the standard
stirrer . However, a contact exchange may occur
when samples are submerged in the sulfuric acid elec-
trolyte, determined by the relative values of the poten-
tials of these metals (0.34 V for copper and 30.44 V
for steel). To suppress the contact exchange in surface
treatment, a passivation stage was introduced.
The structure and phase composition of MPCs
were determined by transmission electron microscopy
(TEM) on a JEOL LEM-100cx electron microscope
(Japan) at an accelerating voltage of 100 kV, by X-ray
phase analysis (XPA) on a DRON-2 X-ray diffrac-
tometer (filtered CuK
radiation), and by cathodic
chronopotentiometry in a 1.0 M solution of LiBF
dimethylformamide . In the cathodic chronopo-
tentiometry, a sample was polarized with dc current,
with the time dependence of the potential recorded.
A preliminary XPA study of the samples demon-
strated that the MPC on the samples has a mixed
amorphous-crystalline structure, and, therefore, to per-
form XPA, the samples were calcined in an inert gas
The adhesion of the MPC was determined by the
method of a grid cut. The electrical resistance of
samples with MPC was measured with a V7-16A ver-
satile voltmeter by pressing a graphite electrode
against the surface of a sample under study with a
constant force of 100 g. The resistance was found