1070-4272/05/7802-0243 C 2005 Pleiades Publishing, Inc.
Russian Journal of Applied Chemistry, Vol. 78, No. 2, 2005, pp. 243!246. Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 2, 2005,
Original Russian Text Copyright + 2005 by Kuntyi, Olinets, Kalymon, Olenych.
AND CORROSION PROTECTION OF METALS
Synthesis of Dispersed System (CuO, ZnO) from Lump Braze
with a Vertical Flow-through Electrolyzer
O. I. Kuntyi, V. T. Olinets, Ya. A. Kalymon, and R. R. Olenych
Lvivska Politekhnika National University, Lviv, Ukraine
Received July 26, 2004
Abstract-The electrochemical synthesis of a mixture of dispersed oxides (CuO and ZnO) from secondary
lump braze was studied. The influence exerted by electrolysis parameters on the intensity of synthesis of
the oxide mixture was investigated. The design of the electrolyzer and the flow diagram for synthesis of
a mixture of oxides (CuO and ZnO) from lump braze was suggested.
The electrochemical synthesis of inorganic com-
pounds of nonferrous metals: oxides [1, 2], hydrox-
ides [3, 4], and salts [5, 6], is one of the areas of prep-
arative chemistry that have been rapidly developing
in the last decade. Use of electrolysis makes it pos-
sible to obtain not only pure target products, but also
substances with certain physicochemical characteris-
tics. For example, electrochemically obtained vana-
dium(V) oxide is distinguished by good performance
as a cathode material for lithium batteries , and
copper(II) oxide, by high dispersity and purity .
In this study, we continued a comprehensive study
of the electrochemical synthesis of hydroxides, oxides
, and salts  of nonferrous metals from secondary
Anodic polarization curves were measured in a stan-
dard thermostated electrochemical cell at a potential
sweep rate of 5.0 mV s
with a PI-50-1.1 potentio-
stat. Platinum was used as the auxiliary electrode,
and silver chloride, as reference. Zinc, copper, and
braze (L63 brand, 63 wt % copper and 37 wt % zinc)
in the form of rods 2-mm in diameter pressed into
a fluoroplastic cartridge served as working electrodes.
The samples were trimmed with a fine emery paper
and washed with ethanol prior to each experiment.
A 0.5 M solution of Na
was used as a working
The mixture of oxides CuO and ZnO was synthe-
sized from lump braze in an electrolyzer schematically
shown in Fig. 1.
The steel vessel of the electrolyzer is coated with
nickel by means of electroless plating. The inner walls
are lined with a dielectric film. Current is conveyed
to the bulk anode through the bottom. The cross-
sectional diameter of the bulk anode is 100 mm. As
the cathode serves a copper disc 60 mm in diameter,
closed from above and on sides with a polypropylene
cap, so that only its lower part is working. The spacing
between the cathode and bulk anode can be adjusted
by moving the cathode. In the experiments, braze cut-
tings with a conventional diameter of 233 mm, length
of 3330 mm, and a bulk weight of 1.031.1 g cm
Fig. 1. Schematic of the electrolyzer used to synthese
a mixture of CuO and ZnO from lump braze. (1) Metallic
vessel, (2) vessel lining, (3) current lead, (4) bulk anode
(cuttings), (5) copper cathode, (6) insulating cap, (7) hy-
draulic lock, and (8) seal.