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Zinc plating surface have many small holes, how to do?

I got one part top plate thickness is 20MM bottom is hollow section welding together. The top plate surface already do milling very beautiful surface like mirror but the structure take to zinc plating, result come out surface have many smaller holes (like raining), who known what the problem? how to settle this problem?

Ace Liow
- Malaysia
June 4, 2009

June 4, 2009

Hi, Ace. You haven't supplied sufficient info to help you. What is the substrate -- is it plain low carbon steel? Did it pass a waterbreak test during the cleaning? Is the zinc acid, alkaline, or cyanide? Are these actual holes (pits)? Do the pits extend into the substrate or just through the plating? Get back to us.

Regards,

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