Joseph B Guthrie

US Patent:

56225695, Apr 22, 1997

Filed:

Jun 2, 1995

Appl. No.:

8/459926

Inventors:

Alfred M. Dennis - Newburgh IN
Joseph D. Guthrie - Murrysville PA
George T. Gregory - Lower Burrell PA

Assignee:

Aluminum Company of America - Pittsburgh PA

International Classification:

C23G 100
B08B 100
C09K 1302

US Classification:

134 2

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.