| 摘要 |
<p>A shielding process for a polymer moulded casing comprises initially sensitising the moulded polymer casing by exposure to infra-red radiation at 60 - 100 DEG C for 2 - 10 minutes applying a base coat primer; curing again by infra-red under the same conditions. The initial sensitising significantly improves the deposition rate for subsequent steps and the curing operation is significantly shorter than has heretofore been the case. Subsequently the cured casing is rinsed; activated; coded with copper by electroless deposition; initiated; and then coated with nickel by electroless deposition. A final chrome dipping with a 1.0% chrome solution may be carried out to reduce tarnishing of the finished casing. The products are used in electronic circuits and computers.</p> |
