Cleaning and liquid contact with solids – Processes – Using sequentially applied treating agents
Patent
1987-02-04
1988-10-18
Swisher, Nancy A. B.
Cleaning and liquid contact with solids
Processes
Using sequentially applied treating agents
134 40, C23G 100, C23F 100
Patent
active
047785330
ABSTRACT:
An aluminum-magnesium alloy sheet product having improved levels of brightness for use as container stock including food containers and beverage container ends, said sheet product chemically treated with an alkaline-based cleaner containing a sufficient amount of a compound of 1-hydroxyethylidene-1, 1-diphosphonic acid (HEDP) to inhibit the formation of a magnesium oxide-containing film thereon. Preferably, the sheet product is cast from a 5000 Series aluminum alloy (Aluminum Association designation) and the cleaner contains between about 0.2-0.7% by weight of the HEDP compound. A method for improving the brightness levels of an aluminum-magnesium alloy sheet product is further disclosed. The method comprises chemically treating the sheet product with an alkaline-based cleaner containing between about 0.2-0.7% by weight of an HEDP compound to inhibit the formation of a magnesium oxide-containing film thereon.
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Monsanto Technical Bulletin No. IC/SCS-323, entitled "Dequest.RTM. 2010 Phosphonate; For Scale and Corrosion Control, Chelation, Dispersion".
Gregory George T.
Nock Donald L.
Aluminum Company of America
Swisher Nancy A. B.
Topolosky Gary P.
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