Estimation of the exchange current density and comparative analysis of morphology of electrochemically produced lead and zinc deposits

Authors

  • Nebojša D. Nikolić ICTM-Institute of Electrochemistry, University of Belgrade, Njegoševa 12, Belgrade
  • Predrag M. Živković Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Belgrade
  • Goran Branković Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1a, Belgrade
  • Miomir G. Pavlović ICTM-Institute of Electrochemistry, University of Belgrade, Njegoševa 12, Belgrade

DOI:

https://doi.org/10.2298/JSC161114029N

Keywords:

electrodeposition, lead, zinc, exchange current density, scanning electron microscope (SEM)

Abstract

The processes of lead and zinc electrodeposition from the very dilute electrolytes were compared by the analysis of polarization characteristics and by the scanning electron microscopic (SEM) analysis of the morphology of the deposits obtained in the galvanostatic regime of electrolysis. The exchange current densities for lead and zinc were estimated by comparison of experimentally obtained polarization curves with the simulated ones obtained for the different the exchange current density to the limiting diffusion current density ratios. Using this way for the estimation of the exchange current density, it is shown that the exchange current density for Pb was more than 1300 times higher than the one for Zn. In this way, it is confirmed that the Pb electrodeposition processes are considerably faster than the Zn electrodeposition processes. The difference in the rate of electrochemical processes was confirmed by a comparison of morphologies of lead and zinc deposits obtained at current densities which corresponded to 0.25 and 0.50 values of the limiting diffusion current densities.

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Published

2017-06-28

How to Cite

[1]
N. D. Nikolić, P. M. Živković, G. Branković, and M. G. Pavlović, “Estimation of the exchange current density and comparative analysis of morphology of electrochemically produced lead and zinc deposits”, J. Serb. Chem. Soc., vol. 82, no. 5, pp. 539-550, Jun. 2017.

Issue

Section

Electrochemistry