Synergistic effect of polymer additives and chloride ions and their degradation in copper electrorefinning

Hiroaki Nakano, Satoshi Oue, Hiroshi Kuboyama, Hisaaki Fukushima, Yutaka Hayashibe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The cathode potential for Cu deposition was greatly polarized in solutions containing both Cl- and gelatin or PEG, showing evident synergistic effect of polymer additives and Cl- on Cu deposition. The rotating ring-disk electrode technique revealed that Cu deposition in solutions containing small amounts of Cl- proceeded with initial formation of adsorbed intermediate CuClad. The Cole-Cole plots obtained by AC impedance techniques suggest that the reduction of CuClad is suppressed by polymer additives. The polarization caused by the additives gradually decreased with increasing the electrolysis duration. Gel permeation chromatography showed that the molecular weight of gelatin in electrolyte decreased with increasing the electrolysis duration. The decrease in molecular weight of gelatin by electrolysis brought about the shift of the cathode potential to the more noble direction, showing that the molecular weight of degraded gelatin was related to the deposition potential of Cu.

Original languageEnglish
Title of host publicationThe Minerals, Metals and Materials Society - 3rd International Conference on Processing Materials for Properties 2008, PMP III
Pages65-70
Number of pages6
Volume1
Publication statusPublished - 2009
Event3rd International Conference on Processing Materials for Properties 2008, PMP III - Bangkok, Thailand
Duration: Dec 7 2008Dec 10 2008

Other

Other3rd International Conference on Processing Materials for Properties 2008, PMP III
CountryThailand
CityBangkok
Period12/7/0812/10/08

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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