Q. I am trying to obtain a gold-colored finish in a cyanide-brass plating bath. What should be the ratio of copper to zinc metal in this bath? Any other information that you can give me also would be helpful.— W.J.
A. The table below gives you the color of brass deposits depending on the amount of copper in them:
The two ranges marked with an asterisk (*) will give you a gold-colored deposit.
A typical brass plating bath has the following components and operating parameters:
You will have to do some experimentation using a Hull cell to find the formulation that matches the gold color you are looking for.