The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 26, 1994
Filed:
Nov. 06, 1992
Applicant:
Inventors:
Paul Didier, Gueugnon, FR;
Dominique Henriet, Chambourcy, FR;
Assignee:
Ugine S.A., Puteaux, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23G / ;
U.S. Cl.
CPC ...
134-3 ; 134 41 ;
Abstract
A method for pickling steel materials, in particular continuously on a treatment line, comprising a shot-blasting operation, a preparation operation, a pickling operation and a passivation operation, in which line the preparation operation is carried out by bringing the materials into contact with at least one 2 to 10N sulphuric acid solution, and in which line the pickling operation is carried out by bringing the materials into contact with at least one solution containing 1 to 10% by weight of hydrofluoric acid and Fe.sup.2+ and Fe.sup.3+ ions. No figure.