No passwords, No popups, No cost, No AI:
we earn from 'affiliate link' purchases, making the site possible

Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

  The authoritative public forum
  for Metal Finishing since 1989

-----

Cleaning or darkening the galvanized steel prior to powder coating

"Phosphating of Metals"
by Werner Rausch
phos_rausch1991

on AbeBooks

or eBay or

Amazon

(affil links)

"Handbook of Hot Dip Galvanization"
by Maass & Peissker
galv_hot_dip_handbook2011

on AbeBooks

or eBay or

Amazon

(affil links)

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.

Thanks,

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 °C are available.

S. MEENAKSHISUNDARAM
- CHENNAI, TAMIL NADU, INDIA

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.

Regards,

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

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully 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 might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: