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UDC 544.654.2

RESEARCH OF ELECTROCHEMICALLY DEPOSITED COATINGS BASED ON Ni-W ALLOY

D. V. Suvorov, Ph.D. (Tech.), director CPTM, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
G. P. Gololobov, Ph.D. (Tech.), Senior Researcher CPTM, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
D. Yu. Tarabrin, Ph.D. (Tech.), Senior Researcher CPTM, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
E. V. Slivkin, lead Engineer CPTM, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
M. A. Serpova, Engineer CPTM, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
M. S. Tyshchenko, Engineer CPTM, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.

The main features of electrochemical deposition of the coatings based on Ni-W binary alloy in pulse current mode using pyrophosphate electrolyte were studied. Two electrolytes with pH of 8,7 and 9,5 were used. The deposition was carried out with current density varied in the range of 0,01-0,1 A·cm-2, and duty cycle (relative pulse duration) was changed within 20-100 %. The experimental conditions allowing to reach the maximum of Faradaic efficiency and W-content in the coatings were determined. It was found that the usage of pulse current mode enabled to fabricate crack-free coatings with the thickness greater than 6 μm. The aim of the work is to research the influence of pH level of the electrolyte and the modes of electrochemical deposition of Ni-W alloy on W content in the coating.

Key words: electrochemical deposition, binary Ni-W alloy, pyrophosphate electrolyte, coating, pulsed deposition mode, current efficiency.

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