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topic 2782

Stripping Gold and Nickel from Copper


(1999)

Can I strip gold and nickel plating layers from a copper substrate, hopefully without etching away too much copper. If so, what is the best method?

larry hanke
Larry Hanke
materials testing laboratory
Minneapolis, Minnesota




(1999)

Larry, I've found the best way strip nickel from copper copper is a proprietary, cyanide-based immersion strip. There are several available and your choice will depend on what type of nickel you are trying to strip (electroless, sulfamate, etc.). Check with nickel plating chemical suppliers. The gold can easily be stripped from the nickel with a similar cyanide based stripper.

Keith Wicklund, CEF-SE
avionics - Minneapolis, Minnesota


(1999)

Larry- I must respectfully disagree with Keith. Cyanide will attack (dissolve) copper much faster than it will nickel. Any cyanide stripper which will go through the nickel will then proceed to attack the underlying copper, leaving pits, streaks, etc. The printed circuit industry faces this problem often, and there are proprietary non-cyanide strippers available for this application. Check with chemical suppliers who service this industry.

Patrick Marks
- Chandler, Arizona


(2001)

I have been experienced problems to plate beryllium copper and leaded nickel alloys.These base metals show peeling and blisters when plated with copper, nickel and gold. The adhesion problem is from the base metal. Our process is an automatic process that require a hand pretreatment. Somebody can tell me the best way to clean and activate this base material.

Thanks,

Rafael Leal
- El Segundo, California, USA



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