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Pre treatment of aluminum

Q. We are robotising the coating of aluminum trailers. It would be a great help if the aluminum would not need sanding for the adhesion of an epoxy primer coating. Would anyone know if aluminum could be coated without sanding it first? If so what precoat or primer coating would be suitable to create some kind of adhesion. Could ice blasting be usable as cleaning medium? Please let me know if anyone should have an answer.

Jack Steur
truck coating - Oudenbosch, NB, The Netherlands

"The Surface Treatment & Finishing of Aluminium and Its Alloys"
by Wernick, Pinner & Sheasby

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A. Nalco's Tech Bond sol-gel nanocoating seals the existing natural oxide on aluminum and can serve as a paint base. Their European headquarters is in Leiden, The Netherlands.

Ken Vlach [deceased]
- Goleta, California

contributor of the year honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at, continue to benefit from.

A. Good cleaning is essential for this application. I am not sure of the degree of automation in your process, but adequate cleaning is necessary before priming. There are commercially available wash primers which can be used as a precoat, that are designed specifically for use on aluminum. There are also epoxy primers that may provide adequate adhesion. Your best bet is to discuss this with a paint manufacturer.

Daryl Spindler
Daryl Spindler, CEF
decorative nickel-chrome plating - Greenbrier, Tennessee

March 24, 2022

A. You can use a conversion coating like bond rite, Henkel makes it. But you do need a clean surface for the bond rite.
Here is a process line for you

1) spray or immersion deoxidizer.
2) spray or immersion Di Water rinse.
3) spray or immersion Henkel conversion coating (Alodine 1200).
4) spray or immersion Di Water rinse.
4) Epoxy Primer
5) Paint

John Werner
QE - Long Beach California

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