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Adhesion improvement for addition cured silicones to chromate conversion coated aluminum

IP.com Disclosure Number: IPCOM000014642D
Original Publication Date: 2002-Aug-01
Included in the Prior Art Database: 2003-Jun-20

Publishing Venue



A method for adhesion preservation of Al surfaces treated with a conversion coating to silicone adhesives as those used for coverplate purposes in electronic packages. It has been discovered that cyanide containing conversion coatings interfere with the curing chemistry of Pt-based silicone adhesives (type preferred for these applications) yielding detrimental mechanical integrity at the metal/polymer interface. A baking step of 2 hrs at 200C is sufficient to degrade cyanide included in the conversion coating prior to adhesive application to provide reliable adhesion. Experimental results have confirmed these findings. 1