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Thread 434/61

REPLACEMENT TO PHOSPHTING IN POWDER COATING PROCESS

2006

Dear Sir(s),
Does any one practice non phosphating process with water borne clear coat after degreasing and derusting.
Also,kindly explain that the phosphating really has an effect on the performance of a coating.
Thanks,

B.BALAJI VISWANATH
MANUFACTURER - Bangalore, KARNATAKA, INDIA
publicly reply to B.BALAJI VISWANATH

2006

There are several alternatives to phosphate conversion coatings. These include Chromate, Silane, manganese and others.

The main advantage of a phosphate coating (over no pretreatment coating) is increasing the adhesion of the powdercoating to the substrate. Without adhesion, you don't really have a coating.

Geoff Crowley
Crithwood Ltd.
Westfield, Scotland, UK

publicly reply to Geoff Crowley

There are many treatments other than phosphate, though none are as good. No treatment results in poor adhesion and drastically reduced corrosion resistance.

Ronald Zeeman
Coil Coating - Brampton, ON, Canada
2007
publicly reply to Ronald Zeeman

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