Metal Finishing Guide Book


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Fig. 2. Barrel loading capacity chart in lb for typical parts. The process is conducted at room temperature between 15 and 32°C (60 and 90 F) and at a pH range of 1 to 2 to ensure proper adhesion and high metal efficiency. The low pH acts to maintain and oxide-free condition at all times on the surface of the parts as well as the plating metal particles. The process has an efficiency of about 93%, meaning that approximately 93% of the plating metal added is actually plated on the parts. The mechanical plating cycle usually takes between 30 and 45 minutes. At the end of the cycle, the slurry of glass beads, plated parts, and plating water discharges onto a vibrating "surge hopper" and is then directed to the rinsing and glass bead separation section. This section is a water-sprayed vibrating screen area or magnetic belt, which removes the glass beads for recycling and rinses the parts. Separated parts are then dried by a heated centrifuge or a continuous dryer oven with belt or vibratory transport. ° APPLICABLE PARTS Various part types for which coating opportunities were limited to electroplat395

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