Global Patent Index - EP 0972854 A2

EP 0972854 A2 2000-01-19 - 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

Publication

EP 0972854 A2 (DE)

Application

EP 99111754 A

Priority

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

C23G 1/08 (2013.01)

DCS

BE DE ES FI FR IT SE

DOCDB simple family

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