EP0713926B1 - Verfahren zur Nitrocarburierung von Stahlteilen im Salzbad - Google Patents

Verfahren zur Nitrocarburierung von Stahlteilen im Salzbad Download PDF

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Publication number
EP0713926B1
EP0713926B1 EP95116735A EP95116735A EP0713926B1 EP 0713926 B1 EP0713926 B1 EP 0713926B1 EP 95116735 A EP95116735 A EP 95116735A EP 95116735 A EP95116735 A EP 95116735A EP 0713926 B1 EP0713926 B1 EP 0713926B1
Authority
EP
European Patent Office
Prior art keywords
alkali metal
salt
steels
salt bath
molten salt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95116735A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0713926A1 (de
Inventor
Georg Wahl
Rainer Willing-Lepenies
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Durferrit GmbH Thermotechnik
Original Assignee
Durferrit GmbH Thermotechnik
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Durferrit GmbH Thermotechnik filed Critical Durferrit GmbH Thermotechnik
Publication of EP0713926A1 publication Critical patent/EP0713926A1/de
Application granted granted Critical
Publication of EP0713926B1 publication Critical patent/EP0713926B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/02—Pretreatment of the material to be coated
    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23C—COATING 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
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
    • C23C8/58—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions more than one element being applied in more than one step

Definitions

  • the invention relates to a method for nitrocarburization of components made of steel forming passive layers, in particular from steels with more than 10% by weight chromium and / or more than 4% by weight of nickel, in salt baths.
  • Alloyed steels the larger quantities of chrome, nickel and / or other additives contain, form in the air Passive layers consisting mainly of oxides of Additional metals exist. These passive layers are conditional increased corrosion resistance of these steels but a hindrance when nitrocarburizing such Components in salt baths containing cyanide and cyanate, since the Passive layers the diffusion of nitrogen and Carbon from the salt bath into the steel surface complicate and lead to faulty nitriding layers.
  • This object is achieved in that the Parts in an oxidizing molten salt at 300 to 500 ° C be pretreated.
  • oxidizing salt melt Mixture of alkali nitrate, alkali hydroxide and Alkali carbonate. Salt melts in particular have proven their worth with 5 to 30 wt.% Alkali nitrate, balance alkali hydroxide and Alkali carbonate.
  • the molten salt is advantageously operated at 330 up to 420 ° C, with a period of time for the treatment period 5 to 30 minutes has proven to be beneficial.
  • Oxidizing salt baths are in the nitrocarburizing of Iron materials known per se (e.g. DE-PS 29 34 113), but so far they have only become after nitrocarburizing Increase in corrosion resistance used.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Chemical Treatment Of Metals (AREA)
EP95116735A 1994-11-29 1995-10-23 Verfahren zur Nitrocarburierung von Stahlteilen im Salzbad Expired - Lifetime EP0713926B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4442328 1994-11-29
DE4442328A DE4442328C1 (de) 1994-11-29 1994-11-29 Verfahren zur Vorbehandlung von Stahlteilen vor dem Salzbadnitrieren

Publications (2)

Publication Number Publication Date
EP0713926A1 EP0713926A1 (de) 1996-05-29
EP0713926B1 true EP0713926B1 (de) 1998-12-23

Family

ID=6534360

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95116735A Expired - Lifetime EP0713926B1 (de) 1994-11-29 1995-10-23 Verfahren zur Nitrocarburierung von Stahlteilen im Salzbad

Country Status (5)

Country Link
US (1) US5735971A (ja)
EP (1) EP0713926B1 (ja)
JP (1) JP3636394B2 (ja)
CA (1) CA2163917A1 (ja)
DE (2) DE4442328C1 (ja)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5948177A (en) * 1997-03-17 1999-09-07 Hardinge Inc. Collet metal treating process
US6093303A (en) 1998-08-12 2000-07-25 Swagelok Company Low temperature case hardening processes
US20030155045A1 (en) * 2002-02-05 2003-08-21 Williams Peter C. Lubricated low temperature carburized stainless steel parts
JP4806722B2 (ja) * 2006-06-08 2011-11-02 イルジン ライト メタル カンパニー リミテッド 金属の塩浴窒化方法及びその方法で製造された金属
US20090020187A1 (en) * 2007-07-17 2009-01-22 Russell Steven W Method and apparatus for protecting metal from oxidaton
US8985029B2 (en) * 2009-03-26 2015-03-24 Belanger, Inc. Car wash conveyor dolly and method of making same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3915759A (en) * 1974-01-08 1975-10-28 Coral Chemical Co Black oxide coating for stainless steels
DE2934113C2 (de) * 1979-08-23 1985-05-09 Degussa Ag, 6000 Frankfurt Verfahren zur Erhöhung der Korrosionsbeständigkeit nitrierter Bauteile aus Eisenwerkstoffen
JPS57152461A (en) * 1981-03-16 1982-09-20 Parker Netsushiyori Kogyo Kk Surface treatment of iron member for increasing corrosion and wear resistance
ZA864656B (en) * 1985-06-24 1987-02-25 Ciba Geigy Ag Herbicidally active derivatives of n-phenyl-3,4,5,6-tetrahydrophthalimide
DE3718240C1 (de) * 1987-05-30 1988-01-14 Ewald Schwing Verfahren zur Waermebehandlung von metallischen Werkstuecken in einer gasdurchstroemten Wirbelschicht
DE3933053C1 (ja) * 1989-10-04 1990-05-03 Degussa Ag, 6000 Frankfurt, De
JPH0425574A (ja) * 1990-05-21 1992-01-29 Seiko Epson Corp インクジェットプリンタ用インク

Also Published As

Publication number Publication date
DE4442328C1 (de) 1995-09-21
JP3636394B2 (ja) 2005-04-06
US5735971A (en) 1998-04-07
JPH08209324A (ja) 1996-08-13
CA2163917A1 (en) 1996-05-30
DE59504625D1 (de) 1999-02-04
EP0713926A1 (de) 1996-05-29

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