It is very simple and convenient using the commercial chloroauric acid instead of sodium gold sulfite as the main salt in the Au(I) sulfite electrodeposition bath. In this paper, the effects of chloride ions on cyanide-free Au(I) electrodeposition in the gold sulfite bath are carefully investigated. Both UV–vis absorption spectroscopy and visual inspection reveal that chloride ions suppress the disproportionation reaction of Au(I) and improve the bath stability. Cyclic voltammetry indicates that chloride ions promote the cathodic reduction of Au(I). EC-SERS spectra elucidate that in the sodium sulfite solution, SO 3 2− ions firstly adsorb on the gold electrode, then experience a structural transformation (SO 3 2− → S 2 O 5 2− ), and last electroreduce to S 2 O 3 2− ions (S 2 O 5 2− → S 2 O 3 2− ) as the potential shifts n...

中文翻译：

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氯离子对无氰金电沉积的影响的见解

在亚硫酸金（I）电沉积浴中，使用市售的氯金酸代替亚硫酸钠金作为主要盐非常简单方便。在本文中，我们仔细研究了氯离子对亚硫酸金浴中无氰化物的Au（I）电沉积的影响。紫外可见吸收光谱和目测检查均表明氯离子可抑制Au（I）歧化反应并提高镀液稳定性。循环伏安法表明，氯离子可促进Au（I）的阴极还原。EC-SERS光谱表明，在亚硫酸钠溶液中，SO 3 2-离子首先吸附在金电极上，然后经历结构转变（SO 3 2-→S 2 O 5 2-），最后电还原为S 2 O 3 2−离子（S 2 O 5 2−→S 2 O 3 2−）随着电势移位n ...