University of Surrey

Test tubes in the lab Research in the ATI Dance Research

The Effect of Complex Ion Formation on the Polarisation Potential and Nature of Electrodeposits of Copper, with Particular Reference to Benzotriazole.

Prall, John Karel. (1962) The Effect of Complex Ion Formation on the Polarisation Potential and Nature of Electrodeposits of Copper, with Particular Reference to Benzotriazole. Doctoral thesis, University of Surrey (United Kingdom)..

[img]
Preview
Text
10803878.pdf
Available under License Creative Commons Attribution Non-commercial Share Alike.

Download (23MB) | Preview

Abstract

A critical review of the literature pertaining to acid copper sulphate electrodeposition preceded the following two paths of research:- 1. A study of electrode kinetic factors using plating solutions without addition agents. A new experimental polarisation technique (called the Reproducible Substrate method) was developed which ensured, in particular, that the cathode had no significant time-dependent properties. This enabled reproducible and linear Tafel plots to be obtained even for those solutions that, with classical polarisation methods, did not previously conform to Tafel behaviour. Special solution preparation methods enabled the properties of super-pure solutions (virtually free of chloride ions) to be studied. The marked effect of trace amounts of chloride ions was shown. The super-pure solutions possessed linear Tafel behaviour, but each plot of n a versus log i showed a change in slcpe at n a = 0.1V - these results were the first to directly confirm a previous prediction made that a change in the cathodic rate-step should occur at this overpotential. 2. A study of addition agent action. Initial trials of many active addition agents were effected in order to select only those that were sufficiently stable and marked in effect to warrant further study. In particular, benzotriazole was studied in detail since it markedly raised n a and affected electrodeposit stuctures(in some cases fully bright coherent deposits were obtained). A mechanism of its action was proposed based on the formation of insoluble cuprous benzotriazolate arising from the formation of cuprous ions in the normal discharge process. A physical model was proposed to explain the phenomenon of banding. Analysis showed that the cuprous benzotriazolate inclusions could be quantitatively retrieved by dissolving up the electrodeposits in acidified silver sulphate. The analysis of trace amounts of these inclusions was carried out by"Polarisation Analysis".

Item Type: Thesis (Doctoral)
Divisions : Theses
Authors :
NameEmailORCID
Prall, John Karel.
Date : 1962
Contributors :
ContributionNameEmailORCID
http://www.loc.gov/loc.terms/relators/THS
Additional Information : Thesis (Ph.D.)--University of Surrey (United Kingdom), 1962.
Depositing User : EPrints Services
Date Deposited : 22 Jun 2018 15:15
Last Modified : 06 Nov 2018 16:54
URI: http://epubs.surrey.ac.uk/id/eprint/848343

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800