ISSN 1070-4272, Russian Journal of Applied Chemistry, 2015, Vol. 88, No. 3, pp. 413−417. © Pleiades Publishing, Ltd., 2015.
Original Russian Text © V.V. Rogozhin, Yu.L. Gun’ko, O.L. Kozina, M.G. Mikhalenko, N.O. Kuzyakin, 2015, published in Zhurnal Prikladnoi Khimii, 2015,
Vol. 88, No. 3, pp. 406−410.
AND CORROSION PROTECTION OF METALS
Deposition of Corrosion-Resistant Nickel Coating
onto Porous Bases of Tubular-Plate
Nickel Oxide Electrodes
V. V. Rogozhin, Yu. L. Gun’ko, O. L. Kozina, M. G. Mikhalenko, and N. O. Kuzyakin
Nizhny Novgorod State Technical University n.a. R.E. Alekseev, ul. Minina 24, Nizhny Novgorod, 603950 Russia
Received February 5, 2015
Abstract—It is advisable to use electrodeposited nickel–boron coatings to improve the corrosion resistance of
the nickel coating on porous ﬁ brous bases of tubular-plate nickel oxide electrodes of chemical power cells. It was
found that a substantial nonuniformity of the current distribution and the coating thickness in deep and surface
layers of the base is observed in nickel plating of bases of this kind. This nonuniformity leads to appearance of
coating areas with different boron contents of the alloy and various corrosion resistances. Mathematical simula-
tion methods were used to ﬁ nd the conditions in which coating of prescribed composition can be deposited with
the maximum metal and boron distribution homogeneity in the alloy on geometrically complex porous bases
Recently, considerable attention has been given to
development of a fabrication technology of nickel oxide
electrodes for nickel–cadmium batteries with positive
electrodes on highly porous metallized ﬁ brous bases.
Electrodes of this kind have high speciﬁ c characteristics of
up to 0.3–0.4 A h cm
, long service life (1000 cycles
and more) , and reduced expenditure of nickel per
unit power cell capacity. The large speciﬁ c surface area
of metallized ﬁ brous bases provides a developed current
lead to the active mass and raises its utilization coefﬁ cient.
The fabrication technology of porous electrodes of this
kind includes procedures in which the surface of a ﬁ ber
as an insulator is prepared, nickel plating, and subsequent
ﬁ lling of the ﬁ ber skeleton metallized with nickel with
the active substance.
Nickel plating is one of the most important procedures
because the properties of this coating affect the service life
of a battery and its capacity characteristics. The reason is
that, in prolonged operation of a battery, the nickel layer
of the base of a nickel oxide electrode is at potentials more
positive than that of the oxygen electrode and is subject
to permanent oxidation. Therefore, it is required that the
nickel plating of the porous base should provide a uniform
thickness of the nickel coating across the thickness of
the porous base and a high corrosion resistance of the
elctroplated nickel coating itself to ensure the maximum
service life of a nickel–cadmium battery.
According to published data, the service life of a
battery with nickel oxide electrodes of similar design is
long at an average thickness of the electrically conducting
layer of about 5 μm . The suggested thickness of the
metallic nickel layer should take into account its oxidation
in operation of a battery and the nonuniformity of its
thickness across the porous electrode base. Accordingly,
the service life of a battery can be made longer at a
simultaneous decrease in the expenditure of nickel
for formation of an electrically conducting layer if a
high corrosion resistance of the nickel coating and the
maximum uniformity of its thickness are provided.
The corrosion resistance of the electrically conducting
layer can be raised by electrodeposition of a nickel–boron
alloy [4, 5], which has a more perfect structure and
lower porosity and anodic activity and electrolytes for
its deposition show a better throwing power (TP) and
provide a better thickness uniformity of the electrically
conducting layer of the coating.