The role of the variable components of current during electrodeposition of coatings
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GOLOGAN, Viorel, BOBANOVA, Zh., IVASHKU, S., KROITORU, Dumitru, SIDEL’NIKOVA, Svetlana. The role of the variable components of current during electrodeposition of coatings. In: Materials Science and Condensed Matter Physics, Ed. 8-th Edition, 12-16 septembrie 2016, Chişinău. Chişinău: Institutul de Fizică Aplicată, 2016, Editia 8, p. 324. ISBN 978-9975-9787-1-2.
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Materials Science and Condensed Matter Physics
Editia 8, 2016
Conferința "International Conference on Materials Science and Condensed Matter Physics"
8-th Edition, Chişinău, Moldova, 12-16 septembrie 2016

The role of the variable components of current during electrodeposition of coatings


Pag. 324-324

Gologan Viorel, Bobanova Zh., Ivashku S., Kroitoru Dumitru, Sidel’nikova Svetlana
 
Institute of Applied Physics, Academy of Sciences of Moldova
 
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Disponibil în IBN: 6 august 2019


Rezumat

In the studies performed it was found that varying the parameters (L, C)  of the inductancecapacitance device (ICD) the process of the electroplating can be markedly influenced in terms of its kinetics (cathode polarization, spectrum of the variable components (VC) of the current), the rate of the deposition (increase in the current efficiency and current density), structure and physicomechanical properties (microhardness and wear resistance) of the coatings. Under the optimal conditions of the deposition (Con, Lon), the potential of the cathode shifts towards the positive region and is accompanied by an increase in the amplitude-frequency values of VC of the current which characterizes the activity growth of the process. In this case, the number of crystallization centers, the current efficiency, the microhardness and wear resistance of the depositions were found to increase and the sizes of aggregates to decrease. Similar results are presented in the published works that describe the deposition process in the magnetic field, which are explained by the effect of the Lorentz force on the magnetohydrodynamic convection, which enables to increase both the ion mass transfer and, hence, the rate of the deposition [1]. In the case of the electric field influence, the microdynamic movements in the region of a double layer are affected by the field intensity, the total actions of the pulses of low-molecular ions on the entire mass of the liquid, the electric fields induced by the charge of the phase interface and the total volume charge in this area [2].   Superposition of high frequency currents on the basic current facilitates the increase in the rate of the electric processes as the effect of a synergetic coherency of electrochemical and electrodynamic processes in electrolytes, which manifests itself in the regular stability of connection between the phases, frequencies, polarizations, wave amplitudes, as well as the formation of stable extended objects with a strictly ordered spatial structure [3]. Therefore, the acceleration of the electrolysis occurs both due to an increase in the amount of the current carriers and the structure of the electrolyte, and in the presence of ions Н+ and ОН-, a hydrogen bond is possible between the typical radicals of the electrolyte and the resonance of the currents at certain frequencies of the electromagnetic fields which depends on the macroscopic properties of capacity and inductance of nanostructures of the electrolyte [4].   The aforementioned makes it possible to assume that in the case of the ICD use the deposition process depends on the effect of the resonance of the variable components of the current that results in the amplitude-frequency change of their spectrum which affects the kinetics of the process and the properties of the coatings.   This work was supported by the Academy of Sciences of Moldova (project 15.817.02.05.A)