On 4/18/2011 9:09 AM, Dan Schaefer wrote:

As far as bonding to any epoxy, I'd bet that hard anodize would provide as good or better a surface as bare Al or alodine. Regardless of the surface treatment, the shear strength of the bond will far exceed the peel strength, so one needs to assess the application.

Foggy memory time: (Meaning, it's been a while.) Anodizing can provide an excellent bonding surface but you MUST specify that you are using it for bonding so that the anodizer doesn't seal the surface. They seal it by immersing it in water. If left unsealed they should return the part in a container with dessicant keeping moisture from the part. This also means that you should be ready to bond the part immediately after anodizing because the part is immensely hygroscopic and will self seal in days if left open and eventually even if sealed in a bag.

Guy Buchanan
Ramona, CA
Kitfox IV-1200 / 592-C / Warp 3cs / 500 hrs. and grounded