Electrochemical Properties of Chromium Coatings Deposited
from Chromium(III) Electrolytes Containing
Formic Acid and Its Derivatives
L. N. Vykhodtsevaa, A. A. Edigaryanb, E. N. Lubninb,
Yu. M. Polukarovb, and V. A. Safonova,z
a Chemistry Faculty, Moscow State University, Vorob’evy Gory 1, Moscow, 119899 Russia
b Institute of Physical Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 117915 Russia
Received March 20, 2003
Abstract—To study electrocatalytic properties of chromium, its deposits are obtained from Cr(III) electrolytes
containing formic acid and its four derivatives (formaldehyde, methyl alcohol, formamide, dimethylformamide)
and comprehensively examined. Amorphous structure of the deposits is established with an x-ray diffraction anal-
ysis. The valence state of chromium and major extrinsic elements is studied by x-ray photoelectron spectroscopy.
The carbon reduction degree and the organization of carbon particles in deep layers of the deposits (chainlike or
graphite-like structures) is shown to depend on the nature of organic compounds added into the chromium-plating
electrolyte. The corrosion–electrochemical behavior of the obtained deposits in 0.5 M H2SO4 is compared to that
of polycrystalline chromium and deposits plated from sulfate–oxalate Cr(III) electrolytes.
Key words: chromium electrodeposition, Cr(III), formic acid, electrocatalysis, x-ray photoelectron spectroscopy
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