ELECTROCHEMICAL DEPOSITION OF CRACK – FREE COATINGS ON BASE OF NI – W BINARY ALLOY
Abstract
The main features of electrochemical deposition of the coatings based on Ni – W alloy in the pulse current mode using pyrophosphate electrolyte was studied. Two electrolytes with pH of 8.7 and 9.5 were used. The deposition was carried out with the current density varied in the range of 0.01 – 0.1 A.cm–2, and the duty cycle (the relative pulse duration) was changed within 20 – 100 %. The surface morphology, elemental and phase composition of the coatings were studied by SEM, EDS and XRD. The experimental conditions allowing to reach maximum of the Faradaic efficiency and W – content in the coatings are determined. It was found that the pulse current mode enabled to fabricate high – quality coatings without cracks at a thickness greater than 6 μm.
About the Authors
А. Tolstoguzov
Universidade Nova de Lisboa
Portugal
Portugal
Centre for Physics and Technological Research (CeFITec), Dept. de Física da Faculdade de Ciências e Tecnologia (FCT
2829 – 516 Caparica
G. P. Gololobov
Ryazan State Radio Engineering University
Russian Federation
Russian Federation
Gagarin Str. 59/1, 390005 Ryazan
D. V. Suvorov
Ryazan State Radio Engineering University
Russian Federation
Russian Federation
Gagarin Str. 59/1, 390005 Ryazan
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Review
For citations:
Tolstoguzov А., Gololobov G.P., Suvorov D.V. ELECTROCHEMICAL DEPOSITION OF CRACK – FREE COATINGS ON BASE OF NI – W BINARY ALLOY. Vestnik of M. Kozybayev North Kazakhstan University. 2018;(2 (39)):222-235.
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