EP0248431A2 - Procédé de réalisation de couches superficielles sur des aciers austénitiques résistants à la chaleur et à la corrosion - Google Patents

Procédé de réalisation de couches superficielles sur des aciers austénitiques résistants à la chaleur et à la corrosion Download PDF

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Publication number
EP0248431A2
EP0248431A2 EP87108108A EP87108108A EP0248431A2 EP 0248431 A2 EP0248431 A2 EP 0248431A2 EP 87108108 A EP87108108 A EP 87108108A EP 87108108 A EP87108108 A EP 87108108A EP 0248431 A2 EP0248431 A2 EP 0248431A2
Authority
EP
European Patent Office
Prior art keywords
layer
heat
corrosion resistant
coating layers
outer coating
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.)
Granted
Application number
EP87108108A
Other languages
German (de)
English (en)
Other versions
EP0248431B1 (fr
EP0248431A3 (en
Inventor
Czeslaw Janczur
Janusz Szelc
Stanislaw Dr. Ing. Mech. Rog
Boleslaw Doz. Dr.-Ing. Mech. Stolarski
Zygmunt Dipl.-Ing. Mech. Szolucha
Adam Kuklewicz
Ryszard Dr. Ing. Mech. Baran
Wieslaw Dipl.-Ing. Mech. Malarz
Tadeusz Dipl.-Ing. Chem. Mysliwy
Jerzy Dipl.-Ing. Mech. Pasich
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.)
Fabryka Samochodow Malolitrazowych "Polmo"
Politechnika Krakowska
Original Assignee
Fabryka Samochodow Malolitrazowych "Polmo"
Politechnika Krakowska
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 Fabryka Samochodow Malolitrazowych "Polmo", Politechnika Krakowska filed Critical Fabryka Samochodow Malolitrazowych "Polmo"
Publication of EP0248431A2 publication Critical patent/EP0248431A2/fr
Publication of EP0248431A3 publication Critical patent/EP0248431A3/de
Application granted granted Critical
Publication of EP0248431B1 publication Critical patent/EP0248431B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to the method for producing the upper diffusion layer with increased physical-chemical properties, the layer achieved in the chemical-thermal process in the gas atmosphere by nitriding or the nitrating derivative treatments, on the elements made of refractory steel or corrosion-resistant steel.
  • the invention particularly relates to steel with an austenitic structure.
  • the passive oxide layer that is formed on the elements at ambient temperature must be removed, and in particular in the course of the heat processes of the chemical-thermal treatment.
  • the oxide layer in particular the chromo oxide, is characterized by stability and is diffusion and penetrating. During nitriding and in the derivatized processes, the oxide layer arises as a result / as a result / of the minimal wetting of the nitriding atmosphere as well as trace amounts of oxygen.
  • the depassivators were used to remove the oxides, for example HF, MBr, NH 4 Cl and other halide compounds as additives for gas atmosphere. These compounds are characterized by high toxicity, which decides the technical and ecological difficulty of the process.
  • the depassivators introduced into the gas atmosphere cause. the depassivation of the inner surfaces of the system, especially the retort in which the process is running
  • the entire surface of the chemically-thermally treated elements is depassivated.
  • the other disadvantage of using the depassivators is the condensation and their deposit in the installation at places with a temperature lower than 300 ° C, which causes a change in the course and instability of the process.
  • the method according to the invention eliminates the technological disadvantages shown.
  • the surface on which the upper diffusion layer is to be produced is depassivated and chemically activated and then galvanically with the iron layer Valve plate is covered with an oxide layer, which makes diffusion impossible. It is favorable with regard to the non-lowering of the plate strength and the corrosion effect of the exhaust gas during valve operation.
  • the enclosed receptacle is in magnification 500 x the metallographic grinding of the valve stem.
  • the diffusion layer 1 having thickness of 0.026 mm, which includes n i trier irons layer 2, is located above the base layer 3 with the vanishing di- sion tracks ffu.
  • the hardness measurements made showed: coated.
  • the iron layer made forms no inhibition of diffusion of nitrogen and other ele- m ducks.
  • the process is non-toxic and enables the upper diffusion layer to be reached on the entire element or selected areas of the element.
  • the other advantage of the invention is the increased rate of diffusion of nitrogen in the steel and repetition of the layer achieved in comparison with other methods, which forms the favorable conditions for use in mass production.
  • the method according to the invention is illustrated by the description of the exemplary process for producing the nitriding layer on the shaft of the exhaust valve of the internal combustion engine.
  • the valve is made of austenitic steel of the 50H21G9N 4 type .
  • the degreasing valve is subjected to electrochemical activation in the sodium gluconate bath.
  • the valve stem is galvanically ironed in order to achieve the iron coating with a thickness of 0.002 mm.
  • the next operation after the valve has dried is the chemical-thermal treatment of gas nitriding.
  • the valve is placed in the hermetic retort connected to the ammonia gas system.
  • the oven tempering at a temperature of 575 ° C during the 2 hours causes the wear-resistant and smear-resistant layer on the shaft, and the

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)
EP19870108108 1986-06-04 1987-06-04 Procédé de réalisation de couches superficielles sur des aciers austénitiques résistants à la chaleur et à la corrosion Expired - Lifetime EP0248431B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL259905 1986-06-04
PL25990586A PL147547B1 (en) 1986-06-04 1986-06-04 Method of producing superficial layers on heat-resisting and stainless steels in particular austenitic ones

Publications (3)

Publication Number Publication Date
EP0248431A2 true EP0248431A2 (fr) 1987-12-09
EP0248431A3 EP0248431A3 (en) 1990-01-31
EP0248431B1 EP0248431B1 (fr) 1993-10-06

Family

ID=20031520

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870108108 Expired - Lifetime EP0248431B1 (fr) 1986-06-04 1987-06-04 Procédé de réalisation de couches superficielles sur des aciers austénitiques résistants à la chaleur et à la corrosion

Country Status (5)

Country Link
EP (1) EP0248431B1 (fr)
CS (1) CS274730B2 (fr)
DD (1) DD263308A5 (fr)
DE (1) DE3787672D1 (fr)
PL (1) PL147547B1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0721997A1 (fr) * 1993-10-27 1996-07-17 Fuji Oozx Inc. Méthode de traitement de la surface d'un élément de soupape en titane ou alliage de titane
US7431778B2 (en) 2002-07-16 2008-10-07 Danmarks Tekniske Universitet-Dtu Case-hardening of stainless steel
EP2497842A1 (fr) * 2000-01-28 2012-09-12 Swagelok Company Processus de durcissement superficiel modifié à basse température
CN101523824B (zh) * 2006-09-30 2013-06-05 卢森特技术有限公司 利用优选列表的会话的许可控制
CN111826654A (zh) * 2020-07-06 2020-10-27 安徽省赛威输送设备有限公司 一种提高提升机壳体耐腐性的处理方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH693272A5 (fr) * 1997-06-04 2003-05-15 Mitsubishi Electric Corp Procédé etappareil pour traitement de surface parétincelage.
EP1850619B1 (fr) 2006-04-28 2012-04-11 Motorola Mobility, Inc. Mise à jour de capacités pendant l'établissement d'un appel

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1453876A (fr) * 1965-05-13 1966-07-22 Ct Tech De L Ind Horlogere Procédé de traitement de pièces à revêtements métalliques de grande dureté età forte protection contre la corrosion et pièces à revêtements métalliques obtenues selon ce procédé
US4326898A (en) * 1978-11-13 1982-04-27 Massachusetts Institute Of Technology Method for forming material surfaces

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0721997A1 (fr) * 1993-10-27 1996-07-17 Fuji Oozx Inc. Méthode de traitement de la surface d'un élément de soupape en titane ou alliage de titane
EP2497842A1 (fr) * 2000-01-28 2012-09-12 Swagelok Company Processus de durcissement superficiel modifié à basse température
US7431778B2 (en) 2002-07-16 2008-10-07 Danmarks Tekniske Universitet-Dtu Case-hardening of stainless steel
CN101523824B (zh) * 2006-09-30 2013-06-05 卢森特技术有限公司 利用优选列表的会话的许可控制
CN111826654A (zh) * 2020-07-06 2020-10-27 安徽省赛威输送设备有限公司 一种提高提升机壳体耐腐性的处理方法

Also Published As

Publication number Publication date
DD263308A5 (de) 1988-12-28
DE3787672D1 (de) 1993-11-11
CS411987A2 (en) 1991-02-12
CS274730B2 (en) 1991-10-15
EP0248431B1 (fr) 1993-10-06
EP0248431A3 (en) 1990-01-31
PL147547B1 (en) 1989-06-30

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