PARTS CLEANING CLINIC

摘要

What is the simplest way to clean a die cast aluminum part one week out of the mold with surface contamination from graphite and grease? I do not wish to shot blast, as it is important to keep the finish as natural as possible and maintain good corrosion resistance. The part is a 7.5-kg exterior luminaire housing measuring 600 × 600 × 270 mm. Is there a cleaning process that also can leave a protection film and be the finish, such as phosphating or passivation? If the graphite and grease is difficult to remove, it is unlikely a simple degrease and conversion coating system would work. That contamination may require an aqueous cleaning tank with a moderate-to-higher (and inhibited) pH cleaner. To improve graphite removal, physical action such as ultrasonics may be necessary to assist in loosening the soil and removing it.