Adhesion of Powder to Anodized Aluminum

Ask an Expert From: Products Finishing, , from Products Finishing magazine

Posted on: 4/5/2011

I would like to get your opinion as to using anodizing as a bonding layer for the powder coating or a wet paint application.

Q. I read the comments made to the question of adhesion failure on aluminum in the January 2011 issue and would like to get your opinion as to using anodizing as a bonding layer for the powder coating or a wet paint application. C.B.

 

A. An anodized aluminum surface is usually used without an organic topcoat. However, some companies want the great corrosion protection from the anodizing and the decorative look of the coating.


I have had inconsistent results with adhesion over anodizing. I am not educated on all of the variables in the anodizing process, so I do not know what impacts adhesion. When it works it is a great finish, but in many cases the anodized surface is not good for powder or liquid bonding.


I would that you do some wet adhesion testing as outlined in AAMA 2605 (American Architectural Manufacturing Association). You do the test the same way as a dry adhesion test per ASTM D3359 (American Society for Testing and Materials) but you place the panel in boiling demineralized water for 20 min after you make the cross hatch cuts and then do the tape pull after the boil. If you can pass that, you probably have a good part
 


Learn More

Editor's Picks

Adhesion Failure on Aluminum

We powder coat aluminum bench seats in 6061 and 6063 alloy and structural steel parts on t...

Zones

Supplier Categories


SIDSP
Magic Rack
Finishing Solutions
Therma-Tron-X
Performance and Service

Suppliers | Products | Experts | News | Articles | Calendar | Process Zones

The Voice of the Finishing Industry Since 1936 Copyright © Gardner Business Media, Inc. 2014

Subscribe | Advertise | Contact Us | All Rights Reserved