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topic 10943

Cleaning or darkening the galvanized steel prior to powder coating

Handbook of Hot Dip Galvanization
from Abe Books


"Phosphating of Metals"
by Werner Rausch

from Abe Books
info on Amazon


I would like to paint some galvanized steel with powder coatings. But I do not know how to prevent the powder coating to be peeled afterwards. Can anybody help me to make a chemical procedure before painting the galvanized surfaces.


Zlen Petmezciler
- ISTANBUL, Turkey


Before applying powder coating, make sure that the surface has been properly prepared: i.e., remove all superficial impurities from the surface, etch the surface, chromate-coat the surface, make sure that the surface is bone-dry, and apply the powder coating, heating it to the temperature and duration recommended by the powder manufacturer.

Pre-treatment process effective at around 25 to 40 Deg C are available.

We shall be glad to answer any queries you may have in this connection.


June 1, 2009

Hi, Zlen. While chromate conversion coating of the galvanized surface can be done, I believe that the best way to prepare galvanizing for powder coating is to zinc phosphatize it. If you patiently search the site for "galvanize powder phosphate" you will find a number of helpful threads. Good luck.


Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey

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