plating, anodizing, & finishing Q&As since 1989
Additive that give brightness to silver plating
I have aluminum piece which I want to make mirror shining polishing for which I use to go for surface cleaning by acid pickling , nickel plating with sulfamate process and finally silver plating . First this three step I have completed now my requirement to give mirror shining to the piece . I at present using ready made potassium cyanide-AgCN solution.
student - Jamnagar, Gujarat, INDIA
There are a number of silver brighteners available for your bath. Potassium Thiosulphate, selenium or antimony based brighteners are just a few. Although proprietary silver brighteners may be a little pricey, you get the added tech support from the supplier when you buy their product. Many brightener suppliers want you to buy the silver salts and anodes from them. If they offer good tech service it's well worth it! A hull cell test with the amount of brightener the supplier suggests would be a good start. They would also have to know a few basics. Free Cn, Ag metal, carbonate level, the age of the bath, when it was carbon treated last. A search for "precious metals for electroplating" will get you kicked off. Good Luck!
process engineer - Malone, New York
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