Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Immersion Primer before powder
September 13, 2011
I'm working on a new project for a current customer and have been given prints that reference an "immersion prime" step. In the past, my paint supplier has done powder direct to metal, but I'm told for these parts that Powder direct to metal (DTM) is not an acceptable option. Supposedly: "the gloss powders typically used have good flow characteristics resulting in very poor edge coverage, which leads to premature edge corrosion. So, an e-coat or a-coat primer is a must prior to a topcoat application."
Interested in any experience you might have with an immersion prime process.
Parts are weldments, plain carbon steel and not abnormally large or complex.
mechanical engineer - Des Moines, Iowa
December 18, 2011
Yes, I think I can help you
Pls tell me step by step what you do.
Regards
- Istanbul
Ecoat, normally cathodic epoxy, provides a very high corrosion resistance and is not affected by Faraday cage effect and edge charge concentration. But it does not provide UV resistance.
A top coat of powder, typically PU / Polyester, provides very good UV resistance.
This combination is used where both aesthetic and performance specs are required.
Components not exposed to sunlight can be processed with only E-coat but if the product is exposed to sunlight, the powder (or liquid) top coat is mandatory.
Hope this helps.
Mohali, Punjab, India
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