brass coating over zinc part reg.,

[prabu]

Hi,
Iam looking for some suggestion from experts, that Iam planning to produce a component in zinc (a pump part weighs about 200 gms) using pressure die casting process and to conceal the same using brass coating. Our ideas is to ease the PDC process(zinc part instead of brass part and to coat brass over the zinc part). My querries are;
1) What are all the types of coating available for coating brass over a zinc component effectively?
1) What should be the coating thickness required?
2) Is it possible to coat, thickness over 0.5mm?
3) If so, will the coating layer retain in the component during rotating?, say pealoff etc.,
Thanks
Prabu

[djewell]

1. It is possible to apply a brass coating over zinc using many techniques including arc spray, flame spray, HVAF, etc.
2. The required coating thickness is whatever you want it to be. If you have a wear tolerance, then the coating should be slightly thicker than that.
3. It is possible to apply thicker than 0.5 mm.
4. If the coating was applied properly, and the surface was well prepared before coating, then the coating should not peel off. You can grind the coating to achieve the surface roughness you require and to change the dimensions as you need them.

[xeviarjekel]

Brass and zink alloy are corrosive prone.