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Phosphate primer

Q. I would like to know if this phosphate treatment is necessary for powder coating parts? Should this process be done only on metal or can it also be used on aluminum as well?

Rocky Lane Honeycutt
POWDERCOATING & BLASTING - Woodleaf, North Carolina, USA

"Phosphating of Metals"
by Werner Rausch

on AbeBooks

or eBay or

Amazon

(affil links)

A. Phosphate coating is recommended as a pretreatment for powder coating as it would help improving the adhesion of the powder coating on the substrate.

Phosphate coating can be deposited on steel as well as aluminum.

T.S.N. Sankara Narayanan
- Chennai, Tamilnadu, India
(ed.note Nov. 2017: The good doctor has a fascinating blog at https://advancementinscience.wordpress.com)

A. Necessary is a relative term. How good a product do you want to sell? If you want to stay in business, you will phosphate it. If not, be cheap and skip it.

James Watts
- Navarre, Florida

A. Hi. Phosphating should be the minimum. Better is chromate conversion coating, although a zinc chromate paint/primer [affil links] is an inexpensive and good step before powder coating.

Luck & Regards,

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

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