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Home  > Forum  > Coatings & raw material failures  > lacquer adhesion to aluminium

Monday, 23 September 2019

lacquer adhesion to aluminium

4 Posts

Saturday 02 October 1999 1:00:00 am

The Epoxy lacquer containing metal complex dyes is coated on aluminium and baked in oven. It was found that adhesion of coating to metal is inferior. What parameter could be affecting the adhesion? How to solve the problem?

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Sunday 03 October 1999 1:00:00 am

Please give more details such as curing temp.,time, thickness of coatings and other resins if any used in formulations for solution to your problem.

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Sunday 03 October 1999 1:00:00 am

Whether you used 2K epoxy or Epoxy ester you should get a good adhesion on to aluminium substrate. You may concentrate on surface treatment, or choice of polymer and its formulation. Please contact me if the problem will continue.

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Sunday 03 October 1999 1:00:00 am

The key to the adhesion of an organic coating to aluminium is the surface preparation that removes the and stable natural oxide and replacesit with a more active layer.You may try one out of the following aproaches:(1)Mechanical treatment by sanding or grit blasting. (2) Chemical treatment with chromatizing solution (there are many commercial treatments like Alodine.(3) A combination of mechanical and chemical, using Epoxy terminated Silanes as the treatment, (4)in some cases an electrolitic anodization with the appropriate pore dimention may be the correct choise, and (5) somtimes the good old phosphoric acid containing "Wash Primer" can do the job.
Arieh Calahorra, PAZKAR Ltd. Afula ISRAEL

Akansha Dubey

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