Global Patent Index - EP 0972854 A2

EP 0972854 A2 20000119 - Process for pickling stainless steel

Title (en)

Process for pickling stainless steel

Title (de)

Verfahren zum Beizen von Edelstahl

Title (fr)

Procédé de dècapage d'acier inoxydable


EP 0972854 A2 (DE)


EP 99111754 A


AT 121798 A

Abstract (en)

A special steel pickling process, employing a hot aqueous hydrochloric acid solution, is new. A special steel pickling process uses an aqueous hydrochloric acid solution at ≥ 40 degrees C. Preferred Features: The solution contains one or more oxidizing agents selected from nitric acid, chlorine, hydrogen peroxide, chlorine-oxygen compounds, other chlorine-containing acids (e.g. perchloric acid), chromium-oxygen compounds (e.g. CrO3) and ferric chloride, in amount such that at least half of the dissolved metal is in the form of ferric chloride.

Abstract (de)

Die Erfindung betrifft ein Verfahren zum Beizen von Edelstahl. Sie ist vornehmlich dadurch gekennzeichnet, daß der Edelstahl in einer wäßrigen Lösung von Salzsäure bei Temperaturen von mindestens 40 °C behandelt wird. <IMAGE>

IPC 1-7

C23G 1/08

IPC 8 full level

C23G 1/02 (2006.01); C23G 1/08 (2006.01)

CPC (source: EP)

C23G 1/08 (2013.01)

Designated contracting state (EPC)


DOCDB simple family (publication)

EP 0972854 A2 20000119; EP 0972854 A3 20000719; EP 0972854 B1 20050504; AT 407755 B 20010625; AT A121798 A 20001015; DE 59912005 D1 20050609; ES 2242330 T3 20051101; KR 100592567 B1 20060626; KR 20000011310 A 20000225; TW 475008 B 20020201; US 6250314 B1 20010626

DOCDB simple family (application)

EP 99111754 A 19990618; AT 121798 A 19980715; DE 59912005 A 19990618; ES 99111754 T 19990618; KR 19990022557 A 19990616; TW 88108564 A 19990525; US 35377699 A 19990715