Patent · US Active

Colored conversion layers devoid of chrome formed on metal surfaces

US8268096B2 · kind B2 · utility

0Cited by

6References

15Claims

0Family size

Assignee

Henkel AG & Co. KGaA · DE

Inventors

Pavel Gentschev · Bad Goisern, AT
Matthias Schweinsberg · Langenfeld, DE
Marco Bastian · Goldkronach, DE
Ulrich Jueptner · Hilden, DE

Key dates

Filing date	Sep 24, 2010
Grant date	Sep 18, 2012
Priority date	—
Expiry date	Sep 24, 2030

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC23C22/73
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A method for producing colored layers on zinc, aluminum, magnesium or alloy surfaces. The surfaces are brought into contact with an aqueous treatment solution which is devoid of chrome, said solution containing, in total, 3-35 g/l persulfate ions and/or peroxodisulfate ions and not more than 10 g/l ammonia or ammonium ions, it has a pH value in the region of between 10-12 and a temperature in the range of between 30-80° C. The surfaces are brought into contact with the treatment solution for a period in the region of 0.5-5 minutes and optionally, they are covered with a coating based on organic polymers. The invention further relates to metal parts treated according to said method.

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