Aluminum cleaning process

Details Aluminum cleaning process Aluminum cleaning process

C - Chemistry, Metallurgy

23

G

149/8

C23G 1/12 (2006.01) C23G 1/00 (2006.01) C23G 1/20 (2006.01)

Patent

CA 1286210

Abstract Of The Disclosure A process for cleaning aluminum container surfaces to remove aluminum fines and residual organic contaminants on the surfaces thereof which is particularly applicable for cleaning drawn and ironed aluminum containers of the type employed in the packaging of foodstuffs and beverages. The process includes a sequential cleaning, rinsing and optional treating cycle including an acidulated pre-wash solution for effecting the removal of a portion of the aluminum fines and organic contaminants followed by a primary alkaline cleaning step for removing the remaining aluminum fines and organic contaminants. The cleaned aluminum cans are thereafter water-base rinsed, preferably with an acidulated water-base rinse solution which can be counterflowed to the pre-wash stage whereafter the containers are preferably subjected to a treatment stage for applying a conversion coating thereon. The cleaned, treated aluminum containers can thereafter be further water rinsed and dried prior to the application of sanitary lacquers, printing inks, and decorative coatings.

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