Electrodeposition of Nanocrystalline Co–W Coatings from Citrate Electrolytes under Conditions of Controlled Hydrodynamic: II. The Electrodeposition Rate and Composition of the Coatings
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BELEVSKII, Stanislav, DIKUSAR, Aleksandr , TSYNTSARU, Natalia. Electrodeposition of Nanocrystalline Co–W Coatings from Citrate Electrolytes under Conditions of Controlled Hydrodynamic: II. The Electrodeposition Rate and Composition of the Coatings. In: Surface Engineering and Applied Electrochemistry, 2010, nr. 2(46), pp. 91-99. ISSN 1068-3755.
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Surface Engineering and Applied Electrochemistry
Numărul 2(46) / 2010 / ISSN 1068-3755 /ISSNe 1934-8002

Electrodeposition of Nanocrystalline Co–W Coatings from Citrate Electrolytes under Conditions of Controlled Hydrodynamic: II. The Electrodeposition Rate and Composition of the Coatings

Pag. 91-99

Belevskii Stanislav, Tsyntsaru Natalia, Dikusar Aleksandr
 
Institute of Applied Physics, Academy of Sciences of Moldova
 
Disponibil în IBN: 14 decembrie 2013


Rezumat

The influence of the ionic mass transfer effects on the deposition rate, the current efficiency, and the composition and morphology of the coatings has been studied using a rotating cylindrical electrode in a citrate electrolyte containing CoSO4 (0,2 mol/l) and Na2WO4 (0.2 mol/l) (pH = 6.8) at the electrodeposition temperature of 60°C. It has been found that the decrease of the electrodeposition potential and the tungsten concentration in the coating with the current efficiency increase upon the Re number growth (Re ≥ 200) occur only under galvanostatic conditions. At the potentiostatic mode, similar of influence fails to be observed. It is shown that the estimated effects take place due to the electrodeposition through the nonstoichiometric surface coating layer with electronic conductivity, the composition components of which are in electrochemical equilibrium with the components of the solution at the film–solution boundary.