Patent · US Expired

Process not using chlorate or nitrite for the production of nickel and manganese containing zinc phosphate films

US5312492A · kind A · utility

3Cited by

3References

6Claims

0Family size

Assignee

Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

Joerg Riesop · Niederzier, DE
Kurt Hosemann · Titz, DE
Karl-Heinz Gottwald · Lechenich, DE

Key dates

Filing date	Dec 10, 1991
Grant date	May 17, 1994
Priority date	—
Expiry date	Dec 10, 2011

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC23C22/184
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

The invention concerns a process, not using chlorate or nitrite, for the production of nickel and manganese containing zinc phosphate films on steel, zinc, and/or zinc alloys by spraying, spray-dipping, and/or dipping, using an aqueous solution. An organic oxidizing agent is added, primarily to depolarize the nascent hydrogen produced.

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