Patent · US Expired

Method of sealing oxidized aluminum surfaces with aqueous solutions of polycarboxylic acids

US4121980A · kind A · utility

12Cited by

3References

11Claims

0Family size

Assignee

Henkel Kommanditgesellschaft auf Aktien (Henkel KGAA) · DE

Inventors

Hans J. Gohausen · Hilden, DE
Winfried Kirchhoff · Düsseldorf, DE
Jurgen Lindener · Monheim, DE

Key dates

Filing date	Nov 2, 1977
Grant date	Oct 24, 1978
Priority date	—
Expiry date	Nov 2, 1997

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC25D11/246
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

In the process of treating an aluminum or aluminum alloy surface which comprises anodically oxidizing the surface and subsequently sealing the surface, the improvement consisting of sealing in an aqueous solution at a temperature between 90.degree. C and the boiling temperature of the solution, said aqueous solution having a pH value of from 4 to 8 and containing from 0.0005 to 0.2 gm per liter of cycloaliphatic or aromatic polycarboxylic acid or water-soluble salt thereof, said cycloaliphatic or aromatic polycarboxylic acid having 4 to 6 carboxyl groups.

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