Unusual Corrosion Paint Spec 1

[Doodler3D]

All,

Would an silicone alkyd resin topcoat work with an epoxy polyamide base? I've seen either epoxy or alkyd systems but not both of them together. The spec is for an ISO 12944-C5X @ 200^oC

COAT 1: ORGANIC ZINC PRIMER
COAT 2: POLYAMIDE/NOVOLAC EPOXY
COAT 3: SILICONE ALKYD RESIN

Thank you.

 

[TugboatEng]

I would recommend allowing full cure of the epoxy and then mechanical prep prior to applying an alkyd base. I expect you will find this option unreasonable for anything but spot repair.

 

[EdStainless]

I am more familiar with a polyurethane topcoat, but I don't see why an Alkyd wouldn't work.
I am looking for a chance to use this stuff,

https://www.uscoatings.com/blog/vsc...-coating-with-superior-long-term-performance/

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P.E. Metallurgy, consulting work welcomed

 

[SJones]

Good luck getting a zinc rich epoxy to 200 deg C

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

 

[EdStainless]

I have seen some rated for that hot, but you read the fine print and see that the life is shorter.
Yes, 200C is really pushing things.

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P.E. Metallurgy, consulting work welcomed

 

[Doodler3D]

Thank you all,

We got the customer to change specs, as the ISO 12944 technically does not cover high temp service. Instead, they settled with a hi-temp silicone. I am not sure how they came up with the requirement in the first place. However, I got conflicting views from AkzoNobel-PPG and SW/Carboline. AkzoNobel-PPG were skeptical whereas the latter approved a combination of zinc-epoxy-alkyd resin.

Cheers!

 

[SJones]

IOGP S-715, Coating System Datasheet 1C
IOGP S-715

Ask the manufacturers for the requisite ISO 12944-9 qualification report.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.