Patent · US Expired

Process for the production of oxide ceramic surface films on silicon-containing light metal cast alloys

US5225069A · kind A · utility

6Cited by

0References

8Claims

0Family size

Assignee

JENOPTIK GmbH · DE

Inventors

Kerstin Haupt · Jena, DE
Jurgen Schmidt · Los Alamos, US
Ullrich Bayer · Bad Doberan, DE
Thomas Furche · Jena, DE

Key dates

Filing date	May 18, 1992
Grant date	Jul 6, 1993
Priority date	—
Expiry date	May 18, 2012

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC25D11/16
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A process for the production of white and black oxide ceramic surface films on silicon-containing light metal cast alloys by plasma-chemical anodic oxidation. An aluminum cast alloy is pickled with nitric acid and hydrofluoric acid and coated by plasma-chemical anodic oxidation in an aqueous electrolyte. Accordingly, a coating variant is provided particularly for construction parts of silicon-containing light metal cast alloys having complicated shapes which enables the production of uniformly thin oxide ceramic surface films in contrast to conventional coating variants.

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