Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 1, pp. 58−61.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
O.A. Taranina, N.V. Evreinova, I.A. Shoshina, V.N. Naraev, K.I. Tikhonov, 2010, published in Zhurnal Prikladnoi Khimii, 2010, Vol. 83,
No. 1, pp. 60−63.
AND CORROSION PROTECTION OF METALS
Electrodeposition of Nickel from Sulfate Solutions
in the Presence of Aminoacetic Acid
O. A. Taranina, N. V. Evreinova, I. A. Shoshina, V. N. Naraev, and K. I. Tikhonov
St. Petersburg State Technological Institute, St. Petersburg, Russia
Received October 15, 2009
Abstract—Kinetics of nickel electrodeposition from sulfate electrolytes in the presence of aminoacetic acid at
pH of 2.0 and 5.5 in the temperature range 20–50°C is considered.
It is known  that various To obtain high-quality
coatings composed of iron-group metals, it is recommended
to introduce aminoacetic acid into the electrolyte [1, 2],
mostly as a buffer additive . It is known, however,
that glycine forms complexes of various compositions
with many metals . Published data on the inﬂ uence
of glycine on the kinetics of electrode reactions in
electrolyses of nickel salt solutions are scarce.
The goal of this study was to examine the kinetics of
electrode processes and coating deposition conditions in
an electrolysis of a nickel sulfate electrolyte containing
The study was performed under the following
conditions: solution composition (M): NiSO
0.20, aminoacetic acid concentrations in the range 0.13–
0.30; pH 2.0 and 5.5; temperature range 20–50°C. The
solutions were prepared from NiSO
O and NaCl of
chemically pure grade and NH
COOH of analytically
pure grade. The necessary pH value was set using
concentrated sulfuric acid or sodium hydroxide (both
of analytically pure grade). The concentration of nickel
ions in solution was determined by complexonometric
titration , and the current efﬁ ciency (CE) by nickel,
by the gravimetric method. Deposits were obtained in the
galvanostatic mode, using a B5-47 stabilized power source.
Polarization curves were measured potentiostatically in a
thermostated three-electrode glass cell. A 1-cm
electrolytic nickel served as the working electrode; nickel
of N0 brand, as auxiliary electrodes; and saturated silver
chloride, as reference. The potentials were recalculated
to the standard hydrogen electrode scale. The buffer
capacity was determined by potentiometric titration,
following the procedure described in . Electronic
absorption spectra of solutions were recorded with an
SF-56 spectrophotometer in the range 190–1100 nm in
quartz cuvettes with a layer thickness l = 1 cm.
The current efﬁ ciencies by nickel at various glycine
concentrations at 40°C are listed in Table 1 in relation to
the current density and solution pH. It can be seen that
the manner in which the CE varies with the aminoacetic
acid concentration depends on the pH value. For
example, at pH 5.5, introduction of 0.13 M of glycine
somewhat raises the CE, whereas further increase in
the glycine concentration hardly has any effect because
the CE ﬂ uctuates within 1–2%. However, the presence
of glycine results in that the outward appearance of the
coatings is improved, with the coatings becoming light
gray and lustrous, and the range of current densities at
which high-quality coatings are obtained is extended (to
10 A dm
Another behavior is observed at pH 2.0: the CE sharply
decreases as the glycine concentration is raised. Probably,
presence of aminoacetic acid in the electrolyte makes
lower the hydrogen evolution overvoltage. It should be
noted, however, that, under the conditions studied, the
increase in the CE with the current density is preserved.
Similar dependences were observed at temperatures of 20
and 50°C. Metal deposits obtained from a solution with
pH 2.0 are light gray, matte, and show no cracking.