Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 26    No. 12    December 2016

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Nucleation and early stages of growth of lead onto copper electrodes from dilute electrolytes
Neboj?a D. NIKOLI?1, Sanja I. STEVANOVI?1, Goran BRANKOVI?2

1. ICTM-Department of Electrochemistry, University of Belgrade, Njego?eva 12, Belgrade, Serbia;
2. Institute for Multidisciplinary Research, University of Belgrade, Kneza Vi?eslava 1a, Belgrade, Serbia

Abstract:The processes of nucleation and growth of lead from the dilute electrolytes on copper substrates were investigated by chronoamperometry and by scanning electron microscopic (SEM) analysis of the deposits obtained in the potentiostatic regime of electrolysis. In the dependence of electrodeposition conditions, the nucleation of Pb followed either progressive or instantaneous type. The type of nucleation changed from progressive to instantaneous one with increasing the concentration of Pb(II) ions and the overpotential of electrodeposition. Regardless of the type nucleation, a novel type of Pb particles like cobweb was formed by the potentiostatic electrodeposition in the moment of nucleation and at the early stages of growth. On the basis of the shape of cobweb-like particles and the electrodeposition conditions leading to their formation, these particles were situated in the group of spongy-like ones. Also, comparative morphological analysis of Pb deposits obtained in the conditions of progressive and instantaneous nucleation confirmed the existence of two limiting types of nucleation.

 

Key words: electrodeposition; lead; nucleation; growth; morphology; chronoamperometry

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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