Decorative Black Carbon Removal

After molding these decorative aluminum plates are treated with a black carbon/oxide that then needs to be removed to create a striking, shadow effect.

Before tumbling

After tumbling

While it might seem that an abrasive media with lots of corners (like a triangle or angle cut cylinder) would be best to remove the carbon, this part was vibratory tumbled with Precision Ceramic Spheres and Kramco 1030 to remove the black coating from the high spots. This combination of round media and mild acid cleaner significantly enhanced the 3-dimensional effect desired by the customer.