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It has been found that EMC requirements for plastic housings, used, for example, in microcomputer systems units, can be most efficiently achieved by plating.
English (United States)
This text was extracted from a PDF file.
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Plastics Surface Treatment
It has been found that EMC requirements for plastic housings, used, for
example, in microcomputer systems units, can be most efficiently achieved by
Some plastic materials have dispersed particles or focal points which can be
subjected to selective attack and pit formation into which the plated metal can
interlock and adhere. Others, such as polycarbonates and rigid urethanes can
not be treated in this way. However, these materials can be pre-treated by a
process which attacks, but does not soften the surface and creates crazes on the
surface. These crazes are crack-like defects which are load bearing because the
opposite surfaces are joined by fine fibrils of highly oriented polymer. The pre-
treatment is controlled to prevent progression of the crazes to cracks leading to
In one example, a reactive injection molded rigid urethane component was
subjected to 1, 3 dichloroisopropanol and appropriate wetting agents in an
aqueous medium for a time sufficien cause surface crazing. The surface was
then subjected to an oxidant, such as chromic acid, to produce polar groups on
the surface. The component was then subjected to an electroless copper plating
step. The crazes provided mechanical interlocking adhesion and increased
surface area, and the polar groups allowed wetting by the plating solution and
developed chemical bonds with the plated copper to provide long life high energy
adhesion. The process was comple...