-- The Home Page of the Finishing Industry
23+ years of serious education, promoting Aloha,
& the most fun you can have in metal finishing smiley
    no popups, no spam
on this site
current topics
topic 10781

Powder coating passivated galvanized

Faults in Hot-Dip Galvanizing
from Abe Books


"Phosphating of Metals"
by Werner Rausch

from Abe Books
info on Amazon


We manufacture several different types of cabinets and enclosures. Approximately 60% of these units are galvanized. Our success with powder painters has been sufficient to excellent. However, recently, problems have come up concerning the quality from one of our painters. He claims that passivated galvanized material is the cause of peeling/chipping problems with the paint.

This type of problem has not been a concern with our other painters for some time now and I suspect that this particular fellow is improperly prepping the material and/or improperly curing the material. As I am not a powder paint expert, any help with this problem and proper prep for passivated galvanized is greatly appreciated. I would simply like to know what is correct.

Thank you.

Curt A. Rouse
machine works - Saskatoon, Saskatchewan, Canada

June 1, 2009

Hi, Curt. I believe that you are right that there is a pretreatment issue. The best pretreatment for galvanized metal is zinc phosphating. This question has been asked frequently, so if you search the site you will find many similar threads, and I think you'll agree that zinc phosphate is the only way to go. Good luck.


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

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Comment to THIS thread START a NEW threadView CURRENT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.