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:
Nov. 17, 1992
Filed:
Feb. 05, 1991
Applicant:
Inventors:
Dominique Henriet, Chambourcy, FR;
Paul Didier, Gueugnon, FR;
Assignee:
Ugine, Aciers de Chatillon et Gueugnon, Puteaux, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23G / ;
U.S. Cl.
CPC ...
134-2 ; 134-3 ; 134 41 ; 252 794 ;
Abstract
Method for pickling or cleaning materials of steel, in particular stainless steel, comprising treating the materials with an aqueous solution containing ferrous ions and ferric ions and an organic acid which does not oxidize the iron in an amount sufficient to maintain the Fe.sup.2+ and Fe.sup.3+ ions in solution, the ferric and ferrous ions being present in the solution in a ration Fe.sup.2+ /Fe.sup.3+ between 10/90 and 40/60, and maintaining the ration Fe.sup.2+ /Fe.sup.3+ within the defined range by addition of hydrogen peroxide.