• Tatiana O. Nenastina Kharkiv National Automobile and Highway University, Ukraine
  • Mykola D. Sakhnenko National Technical University "Kharkiv Polytechnic Institute", Ukraine
  • Valeria O. Proskurina National Technical University "Kharkiv Polytechnic Institute", Ukraine




composite coatings, electrochemical deposition, cobalt, refractory metals, catalytic materials


Electrodeposition of refractory metals and zirconium in composite alloys with cobalt allows to obtain coatings with a unique combination of physicochemical properties that are unachievable while using other methods of covering. The coatings deposited by pulsed current can be considered as composite materials the oxide phase for which is formed directly in the electrode process as an intermediate of incomplete reduction of tungstates and hydrolysis of zirconium (IV) salts. It was found that oxygen and carbon are included in the composition of the coatings as well as the main components, thus such systems can be considered as composite.  The topography of the films is distinguished by the presence of elliptical and spherical grains with crystallite sizes of 80 - 180 nm. On the surface of the coatings, there are hills (large grains) with a diameter of 1 - 3 μm. The anodic glucose oxidation on composite-coated electrodes has been studied and the participation of the intermediate metal oxides in the oxygen transfer has been revealed. Triple cobalt and refractory metal (Mo, W, Zr) alloy coatings were deposited from pyrophosphate –citrate electrolytes in the pulsed mode. Cyclic voltamperograms show that the Co-Mo-ZrО2 alloys are characterized by the highest stability during the anode polarization due to the zirconium and molybdenum oxides added to their composition. 


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