Caustic Bath for Pre-copper Plating

Ask an Expert From: Products Finishing,

Posted on: 12/1/2004

Question: Can you help me come up with the amounts of caustic potash and potassium cyanide that you need to makeup a caustic bath to use to neutralize acids from parts prior to copper plating them.

Question:

Can you help me come up with the amounts of caustic potash and potassium cyanide that you need to makeup a caustic bath to use to neutralize acids from parts prior to copper plating them. J.N.

Answer:

It is difficult to answer this question without knowing more about your process. What are the parts? What is the base material? What type of copper plating process are they going into? Even at that, I am not sure I see the necessity of the potassium cyanide in the neutralization tank. The sodium hydroxide alone should take care of that. I guess that amount could be estimated by essentially titrating the rinse tank just prior to the neutralization tank with a known concentration of sodium hydroxide to a pH of seven (neutral). You could then estimate the amount of sodium hydroxide to add to the tank based on an estimated carry-over from the rinse tank, expected sodium hydroxide concentration and expected tank life between additions.

 



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