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AssigneeChemetall GmbH
InventorsHeiko Hellmers, Thomas Wendel, Norbert Maurus
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Described herein is an aqueous, chromium-free composition for a pretreatment of aluminum surfaces, which includes at least one water-soluble phosphorus compound, at least one water-soluble zirconium compound, at least one water-soluble titanium compound, and at least one water-soluble molybdenum compound, a phosphorus compound content being in a range from 15 to 50 mg/l (calculated as phosphorus), a zirconium compound content being in a range from 400 to 600 mg/l (calculated as metal), a titanium compound content being in a range from 85 to 400 mg/l (calculated as metal), and a molybdenum compound content being in a range from 40 to 150 mg/l (calculated as metal). Also described herein are a corresponding method and a correspondingly pretreated component or strip.
An aqueous, chromium-free composition for a pretreatment of aluminum surfaces, which comprises at least one water-soluble phosphorus compound, at least one water-soluble zirconium compound, at least one water-soluble titanium compound, and at least one water-soluble molybdenum compound, a phosphorus compound content being in a range from 25 to 40 mg/l calculated as phosphorus, a zirconium compound content being in a range from 400 to 600 mg/l calculated as metal, a titanium compound content being in a range from 200 to 400 mg/l calculated as metal, and a molybdenum compound content being in a range from 40 to 150 mg/l calculated as metal, the aqueous composition having a pH at room temperature in a range from 2.0 to 5.0.
Dependencies are inferred from the claim text.