New Aspects of the Chemistry of Quaternary Addition Reagents for the Electrocrystallisation of Zinc.

Abstract

The introduction of quaternary pyridinium derivatives
as brightening agents for the electrodeposition of zinc from
alkaline electrolytes is one of the significant recent advances
in this field. This work describes the brightening effect of quaternary pyridinium derivatives, with differences in structure, on the zine deposits obtained from alkaline cyanide and cyanide-free electrolytes. In addition chemical changes were found to be occurring in these solutions, which could be
followed. using ultra-violet and nuclear magnetic resonance
spectroscopy. Analysis of the ultra-violet data has enabled the kinetics of these reactions to be deduced and this together with relevant information from the literature, has led to the hypothesis that the new species are bimolecular ethers. A
correlation of the ultra-violet and electroplating results,
suggests that these bimolecular ethers may be the brightening
agents and not the materials originally added...

Date of Award	Mar 1979
Original language	English
Awarding Institution	Aston University