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Adhesion problems
We are experiencing adhesion problems between sulfamate nickel and acid copper. The adhesion loss is mostly in the low current density areas. I wonder if anyone has suggestions
Donald G. Brown
- Paducah, KY, McCracken
2003
Try entering the acid copper with the current on. Make contact to the rack before entering the tank. The voltage should be higher than normal plating voltage (CD) to cover the low CD areas quickly. If it takes any small amount of time to start electroplating an immersion (chemical replacement) deposit takes place that always has poor adhesion. Another method is to use a cyanide copper strike prior the acid copper (with good rinsing and a mild sulfuric acid dip) There are also non-cyanide alkaline copper strikes that could work as a pre copper to prevent immersion deposits.
Don Baudrand
Consultant - Poulsbo, Washington
(Don is co-author of
"Plating on Plastics"
[on Amazon
or
AbeBooks
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and
"Plating ABS Plastics"
[on Amazon
or
eBay
or
AbeBooks
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2003
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