Electropolishing Gold

Ask an Expert From: Products Finishing, ,

Posted on: 7/1/2005

Quesion: Can you give me a formulation for the electropolishing of gold particularly 14- and 18-karat gold?

Quesion:

Can you give me a formulation for the electropolishing of gold particularly 14- and 18-karat gold? J.J.

Answer:

I am not aware of any formulations that are completely reliable. However, one formulation that has been used in the jewelry business is as follows:

Component Concentration
Potassium cyanide 65 g/liter
Phosphoric acid 18 g/liter
Sodium potassium tartrate 15 g/liter
Ammonium hydroxide 2.5 mL/liter

A voltage of 8 –10 volts and a temperature of 50–60°C should be used. Great care should be exercised with this process in that a large amount of gold can be removed in a short period of time.

In any event, some experimentation will be required to get the results you are looking for.

 


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