ISSN:
1572-8838
Keywords:
additive
;
crystal growth
;
impedance
;
reaction model
;
zinc deposition
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Electrical Engineering, Measurement and Control Technology
Notes:
Abstract The kinetics of zinc deposition from a concentrated chloride electrolyte containing a commercial additive are investigated by impedance spectroscopy. A reaction model formerly validated for zinc deposition in acidic sulphate medium has been adapted to the present electrolyte and closely related to the elementary steps involved in the crystal growth process. Simulation of the electrode kinetics shows that the additive modifies the deposit morphology by changing some specific rates of the surface steps: slowing down the charge transfer reactions, poisoning the active kink sites and increasing the deposition overpotential. Thus zinc deposition takes place on a surface where the intermediate adions Zn+ ad and the active kink sites are more numerous and where the nucleation rate is increased, leading to refined grain size.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1004096822969
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