| 摘要 |
A method is shown of reducing the incidence of stains on objects, such as electrical contact pins, having two or more electroplated regions. An exemplary embodiment is the case of two gold electroplating operations. After the first gold electroplating operation, the article is passed through a cyanide etching bath. The article is typically then polished, and then plated in a second electroplating operation. The etching bath removes extraneous gold deposits that can cause stains. A typical etching solution is a 0.01 molar concentration of KCN etchant and 0.1 molar KOH or K3PO4 buffer in a water solution, typically applied by spraying.
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