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1. WO2002038828 - METHOD OF SURFACE TREATMENT FOR STAINLESS STEEL PRODUCT FOR FUEL CELL

Publication Number WO/2002/038828
Publication Date 16.05.2002
International Application No. PCT/JP2001/009686
International Filing Date 06.11.2001
IPC
C22C 38/42 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
42with copper
C22C 38/44 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
44with molybdenum or tungsten
C22C 38/54 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
54with boron
C23C 22/50 2006.01
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
22Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
05using aqueous solutions
06using aqueous acidic solutions with pH < 6
48not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
50Treatment of iron or alloys based thereon
C23C 26/00 2006.01
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
26Coating not provided for in groups C23C2/-C23C24/87
C23C 28/00 2006.01
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
28Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups C23C2/-C23C26/173
CPC
C22C 38/42
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
42with copper
C22C 38/44
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
44with molybdenum or tungsten
C22C 38/54
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
54with boron
C23C 22/50
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
22Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
05using aqueous solutions
06using aqueous acidic solutions with pH less than 6
48not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
50Treatment of iron or alloys based thereon
C23C 26/00
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
26Coating not provided for in groups C23C2/00 - C23C24/00
C23G 1/086
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
GCLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
1Cleaning or pickling metallic material with solutions or molten salts
02with acid solutions
08Iron or steel
086solutions containing HF
Applicants
  • HONDA GIKEN KOGYO KABUSHIKI KAISHA [JP]/[JP] (AllExceptUS)
  • OHTANI, Teruyuki [JP]/[JP] (UsOnly)
  • TSUJI, Makoto [JP]/[JP] (UsOnly)
  • UTSUNOMIYA, Masao [JP]/[JP] (UsOnly)
Inventors
  • OHTANI, Teruyuki
  • TSUJI, Makoto
  • UTSUNOMIYA, Masao
Agents
  • SUENARI, Mikio
Priority Data
2000-34381910.11.2000JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) METHOD OF SURFACE TREATMENT FOR STAINLESS STEEL PRODUCT FOR FUEL CELL
(FR) PROCÉDÉ DE TRAITEMENT DE SURFACE DE PRODUIT D'ACIER INOXYDABLE POUR PILE À COMBUSTIBLE
Abstract
(EN)
A method for treating the surface of a stainless steel product for a fuel cell containing, in wt %, 0.15 % or less of C, 17 to 36 % of Cr, 0.005 to 3.5 % of B, which comprises the first step of forming in advance a passive film with an oxidizing acid on the surface of the stainless steel product, the second step of allowing an aqueous acid solution to corrode the passive film, to thereby project one or more of a M23C6 type carbide, a M23(C,B)6 type borocarbide and M2B type boride, which are inclusions having good electroconductivity, the third step of forming a passive coating film with an oxidizing acid on the surface of the steel product except that of the inclusion above projected, and the forth step of washing with water and drying. The method of treatment allows, without the use of a method requiring a high cost such as gold plating, the improvement in the contact resistance of the stainless steel product for a fuel cell, which results in the retention of excellent characteristics of a stainless steel product over a long period of time.
(FR)
La présente invention concerne un procédé pour le traitement de surface d'un produit d'acier inoxydable pour une pile à combustible contenant, en masse, 0,15% au maximum de C, 17 à 36% de Cr, 0,005 à 3,5% de B. Une première opération consiste en la formation préalable d'une couche de passivation sur la surface du produit d'acier inoxydable par oxydoréduction à l'acide. Une deuxième opération fait utiliser une solution aqueuse d'acide pour attaquer la couche de passivation, de façon à faire venir en projection des carbures en M23C6, des borocarbures en M23(C,B)6 et un borure en M2B, qui constituent autant d'inclusions bien électro-conductrices. Une troisième opération consiste en la formation d'une couche de passivation par oxydoréduction à l'acide sur la surface du produit d'acier hors des zones concernées par les inclusions venues en projection. La quatrième et dernière opération est un lavage à l'eau suivi d'un séchage. Le traitement de l'invention permet ainsi, sans traitement coûteux tel que le plaquage à l'or, d'améliorer la résistance au contact des produits d'acier inoxydable pour les piles à combustible, ce qui confère sur la durée, de très bonnes caractéristiques aux produits d'acier inoxydable.
Also published as
DE10194846
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