Patent · US Expired

Electrolyte additive for a colorant bath for coloring aluminum and process for coloring aluminum

US5409592A · kind A · utility

1Cited by

2References

14Claims

0Family size

Assignee

Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

Loert D. Meyer · Goldkronach, DE
Volker Sander · Hilden, DE
Juergen Lindener · Goldkronach, DE

Key dates

Filing date	Apr 29, 1993
Grant date	Apr 25, 1995
Priority date	—
Expiry date	Apr 29, 2013

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC25D11/22
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

The invention describes a novel electrolyte additive for a sulfuric acid tin(II) containing colorant bath for the alternating current coloring of anodized aluminum surfaces, consisting of a synergistic mixture of at least one antioxidant of one of the general formulas (I to IV) and at least one throwing power improver of general formula (V), and to a process for the alternating current coloration of anodized aluminum surfaces using the electrolyte additive of the invention.

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