Cleaning and etching process for aluminum containers

Details Cleaning and etching process for aluminum containers Cleaning and etching process for aluminum containers

1983-01-10

1984-10-16

Bashore, S. Leon

Metal treatment

Compositions

Heat treating

134 2, 134 29, 148 615R, 156665, 252 795, 252156, C23F 100, C23F 700, C23G 114

Patent

active

044772904

ABSTRACT:
Drawn and ironed (D & I) aluminum can bodies are prepared for conversion coating by cleaning and etching using a spray of a dilute aqueous solution of caustic and chelating agent at temperatures of up to about 130.degree. F. The dilute aqueous alkaline solution consists essentially of from about 6 to 12 grams per liter of an alkali metal hydroxide and from about 3 to 6 grams per liter of a chelating agent. The cleaning and etching can be accomplished in a single step without smut formation.

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