Citation: YANG Xiao-Wei, ZHANG Yun-Wang, AN Mao-Zhong, ZHANG Lin. Electrodeposition of Gold from Non-cyanide Bath Using 5, 5′-Dimethylhydantoin-gold Complex[J]. Chinese Journal of Inorganic Chemistry, ;2012, 28(12): 2617-2625. shu

Electrodeposition of Gold from Non-cyanide Bath Using 5, 5′-Dimethylhydantoin-gold Complex

1.
1. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China;

Corresponding author: ZHANG Lin,
Received Date: 16 March 2012
Available Online: 19 June 2012
Fund Project:

The effect of plating time and brightening additives (composed of saccharin, butynediol and sodium dodecyl sulfate) on the properties of gold deposits plated from a non-cyanide bath with 5, 5′-dimethylhydantoin (DMH) as the complexing agent was investigated by using scanning electron microscopy (SEM) and linear sweep voltammetry measurements. The results indicate that surface morphologies of gold electrodeposits are not markedly affected and do not change significantly with increasing deposition time, and brightening additives increase the cathodic polarization of bath and refine the grains of electrodeposits. The gold deposition rate in basic bath containing HAuCl₄, DMH, K₃PO₄, KH₂PO₄ is 0.3 μm·min^-1, and the high deposition rate is not influenced by the introduction of brightening additives. The properties of electrodeposits were evaluated by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that the gold electrodeposits have a preferential orientation along (111) direction and are composed of pure Au⁰ state. The electrochemical behavior of Au(Ⅲ) in the bath onto glassy carbon electrode (GCE) at 45 ℃ was studied by cyclic voltammetry and standard rotating disk. The results indicate that the electrodeposition of metallic Au in the bath is an irreversible process and is controlled by the diffusion of Au (Ⅲ) onto GCE. The stability of the DMH-gold bath is also discussed.
- gold electrodeposition;non-cyanide;5, 5′-dimethylhydantoin;cyclic voltammograms;rotating disc electrode
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