Effect of aluminium on polarisation parameters and deposit characteristics in typical nickel sulfate electrolyte for electrowinning applications

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dc.contributor.author Schoeman, Liezl
dc.contributor.author Nsiengani, Emmanuel Nsanda
dc.contributor.author Sole, Kathryn C.
dc.contributor.author Sandenbergh, Roelf
dc.date.accessioned 2020-12-04T11:22:22Z
dc.date.issued 2020-06
dc.description.abstract Impurities present in the sulfate electrolyte during nickel electrodeposition influence the electrowinning process and morphology of deposited nickel metal in various ways. The presence of aluminium can be either detrimental or beneficial, depending on its concentration. Effects of the presence of aluminium in the electrolyte during nickel electrowinning were investigated by evaluation of the relationship between nucleation and plating overpotentials, nickel morphology, deposit contamination, internal stress development, and buffer characteristics of the electrolyte. Results showed that aluminium present at concentrations of lower than 1250 mg/L was unfavourable for the electrowinning process and highly strained nickel deposits of poor morphology were produced; at higher concentrations, the presence of aluminium was advantageous for the morphology and internal stress, and correlated with increased buffer characteristics of the electrolyte. en_ZA
dc.description.department Materials Science and Metallurgical Engineering en_ZA
dc.description.embargo 2021-06-01
dc.description.librarian hj2020 en_ZA
dc.description.sponsorship The Industrial Metals and Minerals Research Institute (IMMRI), based at the University of Pretoria. en_ZA
dc.description.uri http://www.elsevier.com/locate/hydromet en_ZA
dc.identifier.citation Schoeman, L., Nsiengani, E.N., Sole, K.C. et al. 2020, 'Effect of aluminium on polarisation parameters and deposit characteristics in typical nickel sulfate electrolyte for electrowinning applications', Hydrometallurgy, vol. 194, art. 105332, pp. 1-9. en_ZA
dc.identifier.issn 0304-386X (print)
dc.identifier.issn 1879-1158 (online)
dc.identifier.other 10.1016/j.hydromet.2020.105332
dc.identifier.uri http://hdl.handle.net/2263/77286
dc.language.iso en en_ZA
dc.publisher Elsevier en_ZA
dc.rights © 2020 Elsevier B.V. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Hydrometallurgy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Hydrometallurgy, vol. 194, art. 105332, pp. 1-9, 2020, doi : 10.1016/j.hydromet.2020.105332. en_ZA
dc.subject Nickel electrowinning en_ZA
dc.subject Aluminium impurity en_ZA
dc.subject Deposit morphology en_ZA
dc.subject Nucleation overpotential en_ZA
dc.subject Plating overpotential en_ZA
dc.subject Galvanodynamic polarisation en_ZA
dc.subject Internal stress en_ZA
dc.title Effect of aluminium on polarisation parameters and deposit characteristics in typical nickel sulfate electrolyte for electrowinning applications en_ZA
dc.type Postprint Article en_ZA


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