Letter 5091

Copper Plating 

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Hi ppl, I'm plating copper alloy with copper using a high efficiency copper cyanide bath. Using copper anode, we control the free cyanide at 3-4 oz/Gal, copper at 4-5 oz/Gal. The pH is around 13 with temp at 65 C. The problem is whenever I use copper alloy 7025, red spots can be seen on the surface. But none seen when I use different type copper alloy, eg. Olin 194. Does anyone experience this situation? The current density range from 80 - 200 ASF.

I would be grateful if someone could explain what causing this. Thanks.

Deen
- Malaysia

Hello, I am in the need for info re: high purity copper plating over high purity copper piece (101 OFE - Outukumpuo's best). I need to equal the low oxy and physical requirements. Thanks, Paul

Paul Olderr
Fermilab (DOE) - Batavia, IL

Sorry I can't be of help here. I am very curious however, why someone would be interested in plating copper over copper?

W. Carl Erickson
- Rome, NY

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