Patent · US Active

Composition and method for the chromium-free pretreatment of aluminium surfaces

US11686000B2 · kind B2 · utility

0Cited by

1References

20Claims

0Family size

Assignee

CHEMETALL GMBH · DE

Inventors

Heiko Hellmers · Frankfurt am Main, DE
Thomas Wendel · Schwalbach, DE
Norbert Maurus · Langen, DE

Key dates

Filing date	Oct 25, 2017
Grant date	Jun 27, 2023
Priority date	—
Expiry date	Jun 27, 2040

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC22C21/00
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.