-- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

topic 11875

Galvanized vs Cold Rolled: what is the best all-around for paint quality?


I am trying to put together a list of advantages and disadvantages of cold rolled, phosphatized, and painted steel over galvanized, phosphatized, and painted steel. I am trying to get as much information as possible about paint adhesion, weldability, environmental problems with galvanized, health risks and durability of the coating. Can you help me.

Davies Wakefield
- Two Rivers, Wisconsin

Hot Dip Galvanizing


"Duplex Systems: Painting Over Hot-Dip Galvanized Steel" (free download from AGA)


When improperly performed, galvanization can lead to paint adhesion problems, Davies, but when properly done, adhesion isn't an issue.

Powder coating on a properly prepared substrate is a good and very widely used finish. If severe scratching is unlikely, and reasonable life is good enough, you probably have no need to galvanize. But galvanizing is a sacrificial coating, and if you need something that will hold up despite severe scratching, and that will endure decades of tough exposure, galvanizing is your best if not your only choice. Galvanizing plus paint or powder is called a "duplex system".

Good luck with it.

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

October 5, 2012

Q. How can we differentiate CR & GA Sheets visually? Is there any method to check?

Arnold Bharathi
- Chennai, India

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 Q or A to THIS thread START a NEW THREADView This Week's HOT 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

©1995-2017     -    Privacy Policy
How Google uses data when you visit this site.