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How to prevent metal chips on the air pocket/emboss of the material?

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I'm handling copper nickel barrel plating somewhere in Philippines. Our prevailing rejection is metal chips that occurred mostly on the inside portion of the emboss/air pocket. we've done so many countermeasures such as cleaning of copper and nickel tank, electrotreatment,renewed the degreasing solution, conducted ultrasonic cleaning and controlling all standard parameters . any idea where this metal chips come from and how it was formed?

Redford Olan
Surtec Phils. Inc. - Philippines

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A wild guess would be the part has tiny burrs and the tumbling action of the process is knocking off the burrs.
If the part is steel, have you tried sweeping the tanks with a magnet before plating? Increase the flow rate of the filter system will help some.

James Watts
- Navarre, Florida

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I can only guess your Process.

If your copper is acid and the base metal is ferrous alloy. Displacement reaction occurs during electroplating.

HSolidum
- Philadelphia, Pennsylvania, USA

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