Chemical modification of chromate conversion coated aluminum work pieces
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United States of America Patent
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Issued Date -
Jun 16, 2011
app pub date -
Dec 16, 2009
filing date -
Dec 16, 2009
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Abandoned
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Abstract
A method and assembly for chemically modifying chromate converted aluminum work pieces to improve adhesion. The chromate converted aluminum work pieces are treated with oxygen plasma within the range of 500 W to 1500 W for approximately 5 to 30 minutes to chemically modify the free cyanide in the chromate coating. The free cyanide is modified into functional groups that chemically bond with silicone based adhesives. Adhesion strength of at least 100% improvement is observed. An aluminum heat sink is attached to modules with a silicone based elastomer containing a thermally enhanced additive. The thermally enhanced adhesive is dispensed onto application specific integrated circuit (ASIC) chips, memory chips, or laminates of the modules. Subsequently, the assembled device is cured at 150° C. for approximately one hour.
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