Process for cleaning aluminum

Details Process for cleaning aluminum Process for cleaning aluminum

C - Chemistry, Metallurgy

23

G

149/8

C23G 1/00 (2006.01) C23C 22/78 (2006.01) C23G 1/12 (2006.01)

Patent

CA 1273861

Abstract of the Disclosure A process for cleaning aluminum 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 cycle including a primary alkaline cleaning step for effecting the removal of organic contaminants and aluminum fines followed by at least one acidulated water rinse treatment in which the solution is at a pH of below about 6, when the rinse solution contains an accelerating agent, and below about 2.5 when the rinse solution does not contain any accelerating agent, optionally followed by treatment with an aqueous solution adapted to apply a conversion coating on the surface thereof. The combination of treating steps has been found to surprisingly enhance the removal of stains from the surfaces and the mobility of the aluminum containers facilitating their transport in high-speed can lines having capacities in excess of about 1,000 cans per minute.

525743

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