0872-1904 0872-1904 S0872-19042009000600008 India India 00 00 2009 00 00 2009 27 6 725 735

Voltammetric Studies on the Role of Additives in Bright Zinc Electrodeposition from an Alkaline Non-Cyanide Bath

 

S. Shanmugasigamani,1 M. Pushpavanam2,*

 

1 Central Electrochemical Research Institute, Karaikudi 630 006, TN, India

2 A.C. College of Engineering & Technology, Karaikudi-630 004, TN, India

 

Received 3 July 2009; accepted 26 October 2009

 

Abstract

]]> Influence of various carrier additives and brightener additives on the voltammetric behavior of zinc electro deposition from an alkaline non-cyanide bath was studied. Two different cathodic peaks were observed.  Peak I has been attributed to hydrogen reduction / UPD of zinc and peak II to reduction of the metal. The extent of polarization of the zinc deposition to more negative potentials and the corresponding peak current decide the nature of deposits. PVA was found to be the best carrier additive. PVA chains retain zinc hydroxyl anions and control the speed of the rate determining step. Unsaturated aldehydes bring about 3-dimensional nucleation and further increase the polarization when added with PVA.

Keywords: addition agents, alkaline non-cyanide bath, bright zinc plating, cyclic voltammetry, potential scan range.

 

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* Corresponding author. E-mail address: malathypush@yahoo.com

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