-- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing.
    no popups, no spam
on this site
current topics
topic 1402

Powder coat questions

  1. Is polished chrome an acceptable substrate for powder coat ?
  2. Is a five stage pretreatment of zinc phosphate or iron phosphate adequate for a polished chrome substrate?
  3. When powdercoat is totally cured doesn't it also mean that it is adequately adhered?


Rodger Chandler

  1. I believe you would have very poor adhesion.
  2. No, the phosphate treatment relies on a reaction with a suitable steel surface.
  3. No, there are separate tests for adhesion.

I don't know much about paint, could a powder person please expand/correct these answers?

pooky tom pullizi signature
Tom Pullizzi
Falls Township, Pennsylvania


Dear Rodger,

You would probably have poor luck in trying to coat this profile, though maybe not impossible. You must remember that powder likes and needs a surface profile or etch to adhere to. Quick as I say this, the good people at the faucet manufacturing companies are going to email me. Even they have their fair share of problems when they try to coat clear onto their products. Again, powder wants a profile or etch, this is what your phosphate is suppose to be doing. The less etch, the less adhesion you will receive. Only you can determine the allowable adhesion limits of your product. A five stage will work fine for the chrome, however ask your chemical supplier to test some of your parts at a facility that is using chrome parts. Then you test for adhesion. A part that is properly cleaned will have some adhesion characteristics. Is this part an interior substrate? To answer your last question, No, "good" adhesion is observed by applying proper cleaning methods that removes organic and inorganic soils and etches the substrates surface giving the applied coating a surface to bond with. You must then have the proper amount of heat and cure time cycle. A DI or R/O rinse might help eliminate any residual contamination remaining on the part. Need more help? Let me know!

bob utech
Bob Utech
Benson, Minnesota

A Guide to High Performance Powder Coating
by Bob Utech
[link is to Amazon]


Any information on how powder coat and powder clear works, concerning Harley-Davidson motorcycles would be greatly appreciated.

Len Petoliciot

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.