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US 5,330,558 AGranted
Method for removing chromium containing coatings from aluminum substrates
AssigneeHenkel Corporation
InventorsDavid R. McCormick, Chi-Fan Hsu
Life of this patent
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Abstract
The invention is a process for removing a chromium containing coating from an aluminum article. The chromium containing coating is removed from the aluminum article by contacting the aluminum article having the chromium containing coating with an alkaline treating bath to form an ultrasonically removable chromium containing coating and treating the aluminum article with the ultrasonically removable coating with ultrasonic vibrations to remove the chromium containing coating.
Claims20
A process for removing a chromium containing coating from an aluminum article which comprises:
- contacting the aluminum article having a chromium containing coating, with an aqueous alkaline treating solution at a pH above 10 for a sufficient time to form an aluminum article with an ultrasonically removable chromium containing coating;
- and treating the aluminum article, with the ultrasonically removable coating, with ultrasonic vibrations to remove the chromium containing coating.
Dependencies are inferred from the claim text.