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 PDFInfo
- 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
Links
Images
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)
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6086684A (en) * | 1997-06-04 | 2000-07-11 | Japan Science And Technology Corporation | Electric discharge surface treating method and apparatus |
ES2382387T3 (es) | 2006-04-28 | 2012-06-07 | Motorola Mobility, Inc. | Actualización de capacidades durante una llamada |
Citations (3)
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 |
JPS5114837A (en) * | 1974-07-27 | 1976-02-05 | Tokyo Heat Treating | Sutenresukono shintanaruiha nanchitsukashorihoho |
US4326898A (en) * | 1978-11-13 | 1982-04-27 | Massachusetts Institute Of Technology | Method for forming material surfaces |
-
1986
- 1986-06-04 PL PL25990586A patent/PL147547B1/pl unknown
-
1987
- 1987-06-04 CS CS411987A patent/CS274730B2/cs unknown
- 1987-06-04 DE DE87108108T patent/DE3787672D1/de not_active Expired - Fee Related
- 1987-06-04 EP EP19870108108 patent/EP0248431B1/fr not_active Expired - Lifetime
- 1987-06-16 DD DD30385487A patent/DD263308A5/de not_active IP Right Cessation
Patent Citations (3)
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 |
JPS5114837A (en) * | 1974-07-27 | 1976-02-05 | Tokyo Heat Treating | Sutenresukono shintanaruiha nanchitsukashorihoho |
US4326898A (en) * | 1978-11-13 | 1982-04-27 | Massachusetts Institute Of Technology | Method for forming material surfaces |
Non-Patent Citations (2)
Title |
---|
CHEMICAL ABSTRACTS, Band 102, Nr. 18, Mai 1985, Seite 223, Zusammenfassung Nr. 152909r, Columbus, Ohio, US; A.V. BELOTSKII et al.: "Surface-strengthening of metals and alloys by electrolytic alloying and nitriding", & TEKHNOL. ORGAN. PROIZVOD. 1985, (1), 38-9 * |
CHEMICAL ABSTRACTS, Band 85, Nr. 4, 23. August 1976, Seite 229, Zusammenfassung Nr. 50192q, Columbus, Ohio, US; & JP-A-76 14 837 (TOKYO NETSUSHORI KOGYO CO., LTD) 05-02-1976 * |
Cited By (5)
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 |
CS411987A2 (en) | 1991-02-12 |
PL147547B1 (en) | 1989-06-30 |
DE3787672D1 (de) | 1993-11-11 |
CS274730B2 (en) | 1991-10-15 |
EP0248431B1 (fr) | 1993-10-06 |
EP0248431A3 (en) | 1990-01-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2417179A1 (de) | Verfahren zur aufkohlung hochlegierter staehle | |
DE1264351B (de) | Verfahren zur Entfernung von kupferhaltigem Eisenoxydkesselstein | |
EP0248431A2 (fr) | Procédé de réalisation de couches superficielles sur des aciers austénitiques résistants à la chaleur et à la corrosion | |
EP1019561B1 (fr) | Procede et dispositif d'oxydation et de traitement thermique de groupes de pieces | |
DE3501409A1 (de) | Verfahren zum einsatzhaerten von rostfreiem stahl | |
DE2601067A1 (de) | Verfahren zum feuertauchbad-aluminieren von kompakten erzeugnissen aus eisenlegierungen | |
EP1474541B1 (fr) | Procede de fabrication d'une couche d'oxyde sur des pieces metalliques | |
DE19730372C5 (de) | Reinigung und Entpassivierung von zu nitrierenden oder nitrocarburierenden Oberflächen mit leichten Säuren | |
CN1020763C (zh) | 在钢铁表面上形成磷化膜的方法 | |
DE2154938C3 (de) | Verfahren zur Oberflächenvorbehandlung von Stahl vor der Direktweißemaillierung | |
AT140193B (de) | Verfahren zur Oberflächenhärtung von rostfreien Stählen. | |
JPS6137974A (ja) | 耐蝕性に優れるステンレス鋼の着色処理方法 | |
SU1730180A1 (ru) | Способ упрочнени инструмента из быстрорежущей стали | |
DE1521859A1 (de) | Verfahren zur Verbesserung des Korrosionswiderstandes von oberflaechengehaerteten eisernen Oberflaechen | |
EP0034761A2 (fr) | Procédé d'amélioration superficielle de pièces de machines ou d'outils de coupe en alliages ferreux | |
DE2245164C3 (de) | Verfahren zur Herstellung von tauchaluminierten Werkstücke n aus schwarzem perlitischem Temperguß oder aus schwarzem ferritischem oder ferritischperlitischem Temperguß | |
AT69374B (de) | Rostschutz für Eisengegenstände. | |
DE1521607A1 (de) | Verfahren zur Nitrierung von Eisen und Eisenlegierungen in gasfoermigen stickstoffabgebenden Medien | |
DE416725C (de) | Verfahren zur Verhinderung des Verschlackens von Roststaeben | |
DE102004021043A1 (de) | Verfahren zur Oberflächenbehandlung | |
DD140761A1 (de) | Verfahren zum lokalen schutz von eisen-und stahlteilen bei waermebehandlungen | |
DD156718A1 (de) | Verfahren zur erzeugung nitridhaltiger schichten auf passiven metallen | |
DE2233149A1 (de) | Verfahren zur behandlung von kolbenstangen, insbesondere von schwingungsdaempfern | |
DE2245164B2 (de) | Verfahren zur herstellung von tauchaluminierten werkstuecken aus schwarzem perlitischem temperguss oder aus schwarzem ferritischem oder ferritischperlitischem temperguss | |
DE1621499B2 (de) | Verfahren zum herstellen einer schutzschicht auf stahl durch behandeln mit einer waessrigen alkalischen loesung |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): DE FR GB IT |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): DE FR GB IT |
|
17P | Request for examination filed |
Effective date: 19900723 |
|
17Q | First examination report despatched |
Effective date: 19910712 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB IT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19931006 Ref country code: FR Effective date: 19931006 |
|
REF | Corresponds to: |
Ref document number: 3787672 Country of ref document: DE Date of ref document: 19931111 |
|
ITF | It: translation for a ep patent filed |
Owner name: BARZANO' E ZANARDO ROMA S.P.A. |
|
EN | Fr: translation not filed | ||
GBV | Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed] |
Effective date: 19931006 |
|
ITTA | It: last paid annual fee | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19940829 Year of fee payment: 8 |
|
26N | No opposition filed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19960301 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050604 |