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Problems in plating zinc diecastings

Q1)My question is why most of Zinc die casting surface facing blisters problem when it after E/N, Tin, Brass and chrome plating.

Q2) Why does stains appeared after fews month of plating on zinc die casting surface.How to solve this problems ?

Mustafa B. Taib
- Singapore
2003

2003

Die castings are more difficult to plate than, say, plain steel sheets, Mustafa. This partially has to do with zinc being a rather active metal, but it has even more to do with defects and porosity in the castings. A die casting with cold shuts will wick up cleaning solutions and plating solutions, or will retain air, and when this eventually comes out there will be staining.

The primary line of defense is rigorous quality control in the casting process. But vacuum impregnation can be very useful too.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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