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-----Electroless nickel
2005
Right now we try to developed a new project electroless nickel on zinc diecast, our cycle is the following:
1.- Vapor degrease
2.- electrocleaning
3.- rinse
4.- acid dip with acid salt 30 gr/lt
5.- rinse
6.- Copper strike 42 gr/Lt Copper cyanide, 7.5 sodium cyanide, 15 gr/lt carbonate, temperature 45 to 50 °C ph 10.2 to 10.5, time
10 minutes
7.- Rinse
8.- Acid Copper
9.- Rinse
10.- Nickel woods 3 minutes
11.- Rinse
12.- Electroless nickel 30 minutes thicknes 2.5 microns to 5 microns
My question is the follow in appearance the parts looks good but our customer put in the part an electrical component with a special resin, and then are baked at 220°C for 10 minutes, after this operation our parts present blistering on the surface.
Somebody know if my process is correct or need other step to avoid the blistering?
Proquipa S.A de C.V. - Toluca, Mexico
Use a razor to pick at a blister, then you will have a fair idea where the plating is separating. Let us know the results.
Peter Van de Luecht- Melbourne, VIc, Australia
2005
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