Influence of Injection Molding Parameters on the Surface Structure of Polyamide Parts

Injection molded and then electroplated plastic parts are mainly made of acrylonitrile butadiene styrene (ABS) or polycarbonate/acrylonitrile butadiene styrene (PC/ABS) blends. Nevertheless, compared to these materials, polyamide (PA) has superior physical properties. However, the coating quality is inferior to that of conventional polymers and the scrap rates of 25% to 30% are higher. The coating quality depends not only on the electroplating parameters but also on the surface of the injection molded part.

The aim of this paper is to determine the influence of injection molding parameters on the surface structure of injection molded, mineral-filled polyamide parts. Therefore, mineral-filled polyamide parts are produced in a full-factorial design of experiments (DoE) and electroplated subsequently. Afterwards, surface parameters from DIN EN ISO25178 are determined by confocal microscopy for different pre-treatments of the electroplating process chain and at different positions


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