Aluminum rigid container sheet cleaner and cleaning method

Details Aluminum rigid container sheet cleaner and cleaning method Aluminum rigid container sheet cleaner and cleaning method

1995-06-02

1997-04-22

Soderquist, Arlen

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 14, 134 15, 134 40, 134 41, 134 42, 252 795, 510254, 510272, 510433, 510434, 510435, C23G 100, B08B 100, C09K 1302

Patent

active

056225695

ABSTRACT:
A method for cleaning and modifying the surface of aluminum container sheet to make improved food can bodies and/or beverage can ends therefrom. The lowering of magnesium levels on an aluminum oxide surface and through the oxide-metal interface of this sheet, and deposition of at least some phosphorus-containing complex thereon produces container sheet that exhibits improved corrosion performance. The method comprises contacting said container sheet for less than about 20 seconds with a cleaner which preferably includes: about 1.0-10.0 wt. % (10.0-100.0 g/L) of sodium carbonate; about 0.1-2.5 wt. % (1.0-25.0 g/L) of sodium hydroxide, said cleaner including a total carbonate and hydroxide concentration in excess of about 3.0 wt. % (30.0 g/L); about 0.1-2.5 wt. % (1.0-25.0 g/L) of sodium gluconate; about 0.1-2.0 wt. % (1.0-20.0 g/L) of a compound containing 1-hydroxyethylidene-1,1-diphosphonic acid (or "HEDP"); and about 0.05-1.0 wt. % (0.5-10.0 g/L) of an alkylphenoxypolyethoxyethanol-based surfactant, the balance water and incidental impurities.

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