Alkaline cleaning agent for aluminum surfaces
AssigneeHenkel AG & Co. KGaA
InventorsJoerg Riesop, Sarah Klaes, Michal Manko, Jessika Flender
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Abstract
The present invention relates to a method for cleaning and optionally degreasing aluminum surfaces, in particular during serial treatment of can cylinders made of aluminum, which provides a high degree of gloss, the method comprising contacting the aluminum surfaces with an alkaline cleaning agent containing, in addition to a builder and a surfactant, a quantity of at least one aluminate dissolved in water; the invention also relates to an alkaline cleaning agent as an application solution, which agent is especially suitable for use in a method according to the invention.
Claims17
A method for cleaning surfaces of the metal aluminum, in which an aluminum surface to be cleaned is brought into contact with an alkaline cleaning agent which has a pH of greater than 8.0 and contains, in addition to water,
- a) at least one alkaline builder,
- b) a total of at least 0.20 g/kg of aluminates dissolved in water, calculated as AlO2, and
- c) at least one surfactant.
An alkaline cleaning agent for aluminum surfaces, which has a pH of greater than 8.0 and containing, in addition to water,
- a) at least 0.20 g/kg of alkali metal carbonates calculated as CO3,
- b) at least 0.20 g/kg of aluminates dissolved in water, calculated as AlO2,
- c) at least one nonionic surfactant with an HLB value greater than 10.0, and
- d) at least one organic complexing agent, which is selected from α-hydroxycarboxylic acids.
Dependencies are inferred from the claim text.