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Ted Mooney, P.E. RET
Pine Beach, NJ

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Problem: plating on zinc die cast

My plater faced problem, plating on the zinc die cast part (ZDC2). The part is casted by Dynacast proprietary 4-slider machine at 30 cycles/minute. The part is rather thin with basic thickness = 1.7mm & some core in area 0.5mm. The footprint is diameter 25mm. The processing is casting, degate, shot blast, machining (mirror finish on logo area) then plating. The part is semi- matte Cu/Ni/Cr plated with mirror finishing on the logo area.

The problem are:

a) dirty-liked stain on the basic surface
b) white patches on the mirror surface of the logo area
c) inconsistent of finishing, some times too matte and shining.

Wong Weng Fei
- Butterworth, Penang, Malaysia

Get some brass or copper coupons, and try to plate them with your plating line. Are some of the same problems occurring on the coupons?

Tom Pullizzi
Falls Township, Pennsylvania

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