EP 0596121 A4 19941123 - PROCESS FOR FORMING PASSIVE FILM ON STAINLESS STEEL, AND STAINLESS STEEL AND GAS- AND LIQUID-CONTACTING PART.

Title (en)

PROCESS FOR FORMING PASSIVE FILM ON STAINLESS STEEL, AND STAINLESS STEEL AND GAS- AND LIQUID-CONTACTING PART.

Title (de)

VERFAHREN ZUR HERSTELLUNG EINER PASSIVSCHICHT AUF STAHL UND DER VERBINDUNGSSTELLE VON ROSTFREIEM STAHL UND FLÜSSIGKEIT UND GA.

Title (fr)

PROCEDE DE FORMATION D'UN FILM PASSIF SUR L'ACIER INOXYDABLE, ET ELEMENT ENTRANT EN CONTACT AVEC LES GAZ, LES LIQUIDES ET L'ACIER INOXYDABLE.

Publication

EP 0596121 A4 19941123 (EN)

Application

EP 92917389 A 19920528

Priority

JP 9200699 W 19920528
JP 15246691 A 19910528
JP 19871891 A 19910712
JP 21259291 A 19910730

Abstract (en)

[origin: WO9221786A1] A process for forming a passive film excellent in degasifiability and corrosion resistance by making the film extremely flat and dense. The process comprises subjecting the surface of stainless steel to electrolytic polishing, oxidation in an oxidative atmosphere and removal of iron oxide formed thereon by reduction with hydrogen.

IPC 1-7

C23C 8/14; C23C 8/80; C21D 6/00

IPC 8 full level

C21D 1/76 (2006.01); C21D 6/00 (2006.01); C23C 8/02 (2006.01); C23C 8/14 (2006.01); C23C 8/80 (2006.01); C23C 22/00 (2006.01); C25F 3/06 (2006.01); C21D 1/74 (2006.01)

CPC (source: EP)

C21D 6/002 (2013.01); C23C 8/02 (2013.01); C23C 8/80 (2013.01); C21D 1/74 (2013.01)

Citation (search report)

[A] EP 0294558 A1 19881214 - SHINKO PFAUDLER [JP]
[A] EP 0173564 A1 19860305 - SHINKO PFAUDLER [JP]
[A] US 4078949 A 19780314 - BOGGS WILLIAM E, et al
[A] DE 1278804 B 19680926 - OWENS JLLINOIS INC
[A] EP 0327831 A2 19890816 - THYSSEN EDELSTAHLWERKE AG [DE]
[A] EP 0388710 A1 19900926 - MITSUBISHI MOTORS CORP [JP]
[A] PATENT ABSTRACTS OF JAPAN vol. 14, no. 382 (C - 749)<4325> 17 August 1990 (1990-08-17)
[A] PATENT ABSTRACTS OF JAPAN vol. 13, no. 302 (C - 616)<3650> 12 July 1989 (1989-07-12)
See references of WO 9221786A1

Designated contracting state (EPC)

BE FR GB IT NL

DOCDB simple family (publication)

WO 9221786 A1 19921210; EP 0596121 A1 19940511; EP 0596121 A4 19941123; JP 3045576 B2 20000529; JP 3181053 B2 20010703; JP H10204526 A 19980804

DOCDB simple family (application)

JP 9200699 W 19920528; EP 92917389 A 19920528; JP 21259291 A 19910730; JP 51015992 A 19920528