EP 0442775 B1 19950426 - Pickling process for steel materials, in particular stainless steel.
Title (en)
Pickling process for steel materials, in particular stainless steel.
Title (de)
Verfahren zum Beizen von Gegenständen aus Stahl, insbesondere aus rostfreiem Stahl.
Title (fr)
Procédé de décapage de matériaux en acier, notamment en acier inoxydable.
Publication
Application
Priority
FR 9001481 A 19900208
Abstract (en)
[origin: EP0442775A1] Process for pickling steel materials, especially stainless steel, characterised in that the materials are treated with an aqueous solution containing ferrous ions and ferric ions and an organic acid which does not oxidise iron in a sufficient quantity to maintain the Fe<2+> and Fe<3+> ions in solution, the ferrous and ferric ions being present in the solution in a Fe<2+>/Fe<3+> ratio of between 10/90 and 40/60, and in that the Fe<2+>/Fe<3+> ratio is maintained in the specified range by adding hydrogen peroxide.
IPC 1-7
IPC 8 full level
CPC (source: EP KR US)
C23G 1/08 (2013.01 - KR); C23G 1/088 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0442775 A1 19910821; EP 0442775 B1 19950426; AT E121805 T1 19950515; CA 2035847 A1 19910809; CS 31691 A3 19920415; CZ 281613 B6 19961113; DE 69109147 D1 19950601; DE 69109147 T2 19950831; ES 2072560 T3 19950716; FI 910594 A0 19910207; FI 910594 A 19910809; FI 96519 B 19960329; FI 96519 C 19960710; FR 2657888 A1 19910809; FR 2657888 B1 19940415; JP H04218685 A 19920810; KR 100189579 B1 19990601; KR 910015721 A 19910930; NO 303788 B1 19980831; NO 910448 D0 19910206; NO 910448 L 19910809; RU 2072397 C1 19970127; US 5164016 A 19921117
DOCDB simple family (application)
EP 91400252 A 19910201; AT 91400252 T 19910201; CA 2035847 A 19910206; CS 31691 A 19910208; DE 69109147 T 19910201; ES 91400252 T 19910201; FI 910594 A 19910207; FR 9001481 A 19900208; JP 3922391 A 19910208; KR 910001972 A 19910205; NO 910448 A 19910206; SU 4894598 A 19910207; US 64983991 A 19910205