Patent · US Active

Sulphuration method of ferrous alloy parts in an aqueous solution

US8562812B2 · kind B2 · utility

0Cited by

8References

21Claims

0Family size

Assignee

H.E.F. · FR

Inventors

Philippe Maurin-Perrier · Saint-Marcellin-en-Forez, FR
Herve Chavanne · St-Estève, FR
Smail Aaziz · Saint-Étienne, FR

Key dates

Filing date	Nov 16, 2007
Grant date	Oct 22, 2013
Priority date	—
Expiry date	May 11, 2030

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC25D9/06
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

The invention relates to a superficial treatment method by electrolysis of ferrous surfaces to enhance friction or tread and seizing resistance features, wherein the surfaces provide the electrolysis anode, the electrolysis bath includes a sulphur species, primarily contains water and also contains a chloride salt and a nitrogen species in quantities which facilitates the sulphuration reaction of the surfaces.

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