Electrochemical gold deposition from non-toxic electrolytes

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12 Citations (Scopus)


An additive free electrolyte containing aurochloric acid, sodium sulphite and sodium thiosulphate has been used to electrodeposit gold. The electrolyte is stable at near-neutral conditions and was stable on storage after formulation. Laboratory scale experiments showed that the electrolyte was compatible with positive resists. UV-Vis spectroscopy and cyclic voltammetry indicate that gold is discharged from a thiosulphate ligand. Industrial scale piloting experiments showed that high quality gold could be deposited from the electrolyte and the deposition process was stable up to a few weeks. Gold precipitation was observed when the used electrolyte was stored for a long period; this suggests that a product formed during the deposition process, was responsible for gold precipitation.

Original languageEnglish
Pages (from-to)67-72
Number of pages6
JournalECS Transactions
Issue number36
Publication statusPublished - 2009
EventGreen Electrodeposition 2 - 214th ECS Meeting - Honolulu, HI, United States
Duration: 12 Oct 200817 Oct 2008


  • gold deposition
  • non-toxic electrolytes


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