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Best clear topcoat for black oxide (>100hrs salt spray)

Q. We have a request for small black oxided steel parts with good corrosion resistance.
The required finish is more cosmetic than functional and we thought of dip coating these parts in a clear, low viscosity resin just after the blackening process.
Which type of resin would be better? Epoxy, Polyurethane, Acrylic?
Any suggestions on where can I find it in the EU? My recent experience shows that importing "dangerous chemicals" from the US into Europe can be a long and tricky process...

Luis Godinho
Luis Henrique Godinho
RIREV, Lda - coating shop (PVD, WS2) - Vagos, Portugal
2005

A. I think that you can use Paraloid B 44 acrylic resin (7,5% solution-75 gm Paraloid B 44 dissolved in 1 lit toluene )!
Good luck!

Goran Budija
- Cerovski vrh Croatia
2005

A. Hi Luis. I can't comment on the specific clearcoat Goran suggests, but you obviously must not wax or oil the black oxide ... and without those protectants it can flash rust in 1/2 hour or less. So your "just after" is critical. The parts need to be properly rinsed, thoroughly dried, and clearcoated immediately. Good luck!

Regards,

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

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