Patent · US Expired

Process for the treatment of spent pickling paste

US4478647A · kind A · utility

1Cited by

4References

11Claims

0Family size

Assignee

Parker Chemical Company · US

Inventors

Josef Rones · Frankfurt am Main, DE
Siegfried Moller · Frankfurt am Main, DE
Kurt Moesner · Offenbach am Main, DE

Key dates

Filing date	Aug 18, 1983
Grant date	Oct 23, 1984
Priority date	—
Expiry date	Aug 18, 2003

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC23G1/025
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A process for treating spent fluoride-containing pickling paste on metal surfaces by applying to the spent pickling paste on the metal surface an aqueous treating paste composition comprising calcium carbonate having a particle size not in excess of about 5 microns and an alkali metal bicarbonate, which composition has a pH which is not in excess of about 9.5.

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