Russian Journal of Applied Chemistry, 2013, Vol. 86, No. 2, pp. 182−185.
Pleiades Publishing, Ltd., 2013.
Original Russian Text © O.A. Surzhko, 2013, published in Zhurnal Prikladnoi Khimii, 2013, Vol. 86, No. 2, pp. 197−201.
AND CORROSION PROTECTION OF METALS
Electrolytic Deposition of a Cobalt-Lead
Alloy with Magnetic Properties
O. A. Surzhko
South-Russian State Technical University, Novocherkassk Polytechnic Institute, Novocherkassk,
Rostov-on-Don oblast, Russia
Received September 1, 2011
Abstract—Electrolyte for obtaining a cobalt–lead alloy was suggested. The electrochemical parameters at which
cobalt and lead are simultaneously deposited from the pyrophosphate electrolyte were determined. The magnetic
parameters of the alloy were measured.
A study of the process in which alloys are formed
in systems with noninteracting components deserves
attention because alloys of this kind can only be
produced by electrochemical methods. Computer
simulations prognosticate that intermetallic compounds
exist in binary systems formed by components that do
not interact under heating .
Problems associated with syntheses of new
materials and, in particular, alloys possessing valuable
physicochemical, e.g., magnetic, properties are rather
topical . Among methods used to obtain alloys, the
electrochemical technique has a number of speciﬁ c
features: possibility of obtaining alloys in systems
with mutual insolubility of components in solid and
liquid states (cobalt–silver, nickel–lead, copper–lead),
formation of equilibrium (CoSn, InSb) and metastable
Pb) intermetallic compounds absent in constitution
diagrams (NiSn), and deposition of magnetic coatings
on proﬁ led surfaces.
The cobalt–lead system is composed of components
that do not interact in the solid and liquid states, and,
therefore, has the form of two stratifying ﬂ uids at
temperatures above 1713 K. According to Schank, the
solubility of cobalt in liquid lead at 1873 K is 0.84 at
%, and that of lead in liquid cobalt, 0.29 at % . The
so low mutual solubility at high temperatures gives no
way of metallurgically obtaining an alloy that would be
of technical importance, e.g., would possess magnetic
Such magnetic systems as cobalt–platinum and
cobalt–rare earth metals have been produced on the basis
of cobalt. Cobalt being the key element determining the
magnetic properties, it is of interest to replace high-cost
metals in cobalt-based systems with lead. The possibility
of such a replacement is conﬁ rmed by the crystal-
chemical similarity of the elements to be replaced. Indeed,
lead, platinum, yttrium, and praseodymium have crystal
lattices of the same type (cubic) and close values of their
atomic radii: 1.75, 1.33, 1.84, and 1.83 Ǻ, respectively.
Owing to the possibility of replacing platinum and rare-
earth metals with lead, it can be assumed that the cobalt–
lead alloy will possess magnetic properties. Therefore,
determining the magnetic properties of the cobalt–lead
alloy is of particular interest.
The goal of the study was to examine processes of
joint electrolytic deposition of cobalt and lead, which
are metals noninteracting in the molten state, and to
obtain an alloy possessing magnetic properties.
Electrolytes base on complex compound of cobalt
and lead, which made it possible to make substantially