A Growing Copper Bath
Q: My copper sulfate plating bath has grown in concentration. The copper concentration is now too high. Is there anything I can do to prevent this from happening? N. D.
A: The copper sulfate plating bath is a very efficient bath. The anode and cathode efficiency are both close to 100%. However, the anode efficiency is slightly higher than that of the cathode efficiency. Hence, over time the amount of copper in the plating bath will increase. In most situations, drag out will remove this small amount of excess copper. If you have minimal dragout in your plating process, the best way to correct this problem is to remove some of the plating solution and used dilution to bring the remainder back to the proper
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