Jim :
        Here are a few treatments in order of bond strength:

        1) There is a Boeing procedure that is based on a Phosphoric
anodizing process that is exceptionally good. Remember
         to get the material unsealed as the sealing compound will
prevent good adhesion. ( should be listed under an
         ASTM   spec)

        2) If you require less adhesion then a commercial Phosphate
treatment will work .

        3)If you want to do the work in house then try a degrease bath
followed by a pumice slurry to roughen the surface with a
         subsequent dry before bonding.

 ----------
From: Jim Marsico 516-595-5879
To: [log in to unmask]
Subject: [TN] SURFACE PREPARATION OF ALUMINUM
Date: Friday, December 04, 1998 11:21AM

I'm looking for a procedure to prepare a cast aluminum (A356) core for
epoxy
bonding to a polyimide PWB.  Any Recommendations?

Jim Marsico
AIL Systems Inc.
(516) 595-5879
[log in to unmask]


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