Surface Texturing to Reduce Microcracking of Metal Plating On Plastic
Original Publication Date: 1988-Apr-01
Included in the Prior Art Database: 2005-Feb-15
A method for reducing microcracking in metal plating on plastic parts designed for compliance with electromagnetic interference (EMI) shielding requirements is disclosed. The treatment for EMI shielding involves plating the plastic parts with a metallic coating. Microcracks in the metal plating can develop as a result of stress, severely limiting the effectiveness of the EMI shielding. The stress is caused by a number of things including the plating process. Stresses contributed by the molding process of the plastic part are partially relieved in the plating process leading to dimensional changes in the plastic part. These dimensional changes then impose additional stress at the plastic/ metal interface. The stress can also be a result of the mismatch in thermal expansion characteristics of the plastic and the plating.