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topic 17147

A good process sequence for Nickel Plate on Zinc Die Cast


2002

We need to Barrel Nickel Plate, on small parts made from Zinc Die Cast. What would be a good complete process sequence?

We used to apply regular Cyanide Copper for one hour and then Nickel Plate for 45 to 60 minutes. Regularly we had problems with blisters. We have received a new project and suggestions in regards of adding a Copper Strike before the regular Copper Bath. Is this a sound recommendation? How would you process this parts? We don't want to add an acid copper to our line after regular Copper.

Thank you for your answer.

Enrique Segovia
- Monterrey, Mexico


2002

First electroplate pure zinc over the die cast in an alkaline formulation, then Copper Cyanide Strike, then any kind of copper electroplate you want to use.

robert probert
Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina
Editor's note: Mr. Probert is the author of Aluminum How-To / Aluminio El Como
and co-author of The Sulfamate Nickel How-To Guide


2002

Robert,

Thanks for your input. I have never heard of a pure zinc over the die cast. Is this a strike? What would the formulation be? What is the purpose or benefit of this bath?

Regarding the Copper Cyanide Strike, what are the parameters and formulation? How long do we plate on both baths?

Thanks again for your help,

Adios Amigo,
Enrique.

Enrique Segovia
- Monterrey, Mexico


2002

I disagree with the previous reply. No zinc plating is required!

First you need a very mild alkaline cleaner that will not attack the zinc.

Then you need an acid activator followed by a cyanide copper. No strike copper is required!

After the copper, you need an acid activator followed by the nickel.

Most adhesion problems in plating on zinc die casting are related to the acid activator between the copper and the nickel. Its concentration has to be constantly monitored and when it reaches a certain level of copper impurity, it has to be discharged.

sara michaeli
sara michaeli signature 
Sara Michaeli
chemical process supplier
Tel-Aviv, Israel




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