EP0472957B1 - Procédé d'amélioration de la résistance à la corrosion d'objets en acier nitrocarburisé - Google Patents

Procédé d'amélioration de la résistance à la corrosion d'objets en acier nitrocarburisé Download PDF

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Publication number
EP0472957B1
EP0472957B1 EP91113185A EP91113185A EP0472957B1 EP 0472957 B1 EP0472957 B1 EP 0472957B1 EP 91113185 A EP91113185 A EP 91113185A EP 91113185 A EP91113185 A EP 91113185A EP 0472957 B1 EP0472957 B1 EP 0472957B1
Authority
EP
European Patent Office
Prior art keywords
components
corrosion resistance
synthetic resin
und
solution
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
EP91113185A
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German (de)
English (en)
Other versions
EP0472957A1 (fr
Inventor
Ulrich Dr. Christ
Georg Ing. Wahl
Helmut Dr. Kunst
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.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
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Filing date
Publication date
Application filed by Degussa GmbH filed Critical Degussa GmbH
Publication of EP0472957A1 publication Critical patent/EP0472957A1/fr
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Anticipated expiration legal-status Critical
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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
    • C23C8/80—After-treatment

Definitions

  • the invention relates to a method for improving the corrosion resistance of nitrocarburized components made of ferrous materials, which are subjected to one or more oxidation treatment in an oxidizing salt bath or with steam at 500 to 580 ° C and optionally mechanical processing after coating with a thin layer of one organic material.
  • the corrosion resistance of components made of ferrous materials that have been nitrocarburized and quenched from the nitrocarburizing temperature in water or in oil is significantly improved compared to the untreated condition. It is irrelevant whether the nitrocarburizing treatment was carried out in a salt bath, in gas or in plasma.
  • a further increase in corrosion resistance can be achieved if an oxidation treatment is carried out after nitrocarburizing. This can be done by steam treatment in the temperature range 500 to 580 ° C.
  • the oxidation after nitrocarburizing can also be carried out in an oxidizing salt bath, as described for example in DE-PS 29 34 113.
  • nitrocarburization is carried out in a salt bath, the oxidation process will follow immediately, i.e. Transfer the components directly from the nitrocarburizing to the oxidation salt bath without intermediate cooling. If, on the other hand, nitrocarburization is carried out in the gas or in the plasma, it must generally first be cooled to room temperature and the oxidation subsequently effected by hanging it in the salt bath. Although this procedure also results in a significant increase in corrosion resistance, it is less than in salt bath nitrocarburization with direct oxidation in the salt bath without intermediate cooling.
  • a further increase in corrosion resistance is possible if the surface treatment is followed by mechanical surface treatment (e.g. polishing, lapping, surface grinding) and repeated oxidation.
  • the corrosion resistance values achieved with this method of operation are comparable to or better than those of high-quality galvanic layers.
  • EP-PS 0 077 627 A method is known from EP-PS 0 077 627 for providing nitrocarburized components made of ferrous materials with an oxide layer and then quenching them. The components can then be coated with a thin wax coating. In practice, however, this wax film does not bring any appreciable increase in corrosion resistance.
  • the present invention relates to a method for improving the corrosion resistance of nitrocarburized components made of ferrous materials which, after the nitrocarburization, are subjected to one or more oxidation treatments in an oxidizing salt bath or with steam at 500 to 580 ° C. and optionally subjected to mechanical processing, by coating with a thin layer of an organic material, the pretreated components being immersed in a 1-40% solution of a curable synthetic resin in water and / or organic solvents and then heat-treated at 80 to 200 ° C. for 2 to 30 minutes, the concentration of the solution must be chosen so that a synthetic resin layer of 0.2 to 5 microns thick.
  • a solution is preferably used which contains 5 to 25% by weight of a thermosetting synthetic resin.
  • a thermosetting synthetic resin In addition to epoxy resins, melamine resins, polyester resins and polyurethane resins, alkyd resins, acrylate resins and phenolic resins have proven to be the most suitable for this purpose.
  • the temperature and time of the heat treatment depends on the type of synthetic resin used.
  • the synthetic resins can be used in pure or modified form.
  • the concentration of the solution must be chosen so that a synthetic resin layer with a thickness of 0.2 to 5 microns is formed.
  • the post-treatment of the pretreated components according to the invention surprisingly increases their corrosion resistance considerably. Values are achieved that go far beyond the mere protective effect of such a thin, thin synthetic resin layer.
  • the corrosion resistance in the salt spray test according to DIN 50021 is increased several times. Even after 3000 hours, several samples in the salt spray test show no corrosion attack (see table). The fatigue strength and wear resistance of the component are retained, the color is not changed.
  • the surface treatment also reduces the surface roughness. This is generally desirable, but it can also be undesirable in individual cases (changed sliding properties, oil adhesion).
  • suitable additives for the immersion bath for the aftertreatment the roughness depth can be changed within wide limits. For example, highly disperse silica can be used as an additive.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Paints Or Removers (AREA)
  • Laminated Bodies (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Physical Vapour Deposition (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Magnetic Record Carriers (AREA)

Claims (3)

  1. Procédé d'amélioration de la résistance à la corrosion de pièces nitrocarburées en matériaux ferreux qu'on soumet après la nitrocarburation à un ou plusieurs traitements d'oxydation dans un bain de sel oxydant ou à la vapeur d'eau entre 500 et 580°C et le cas échéant qu'on soumet à un usinage mécanique par revêtement avec une couche mince d'un matériau organique, procédé dans lequel on plonge les pièces prétraitées dans une solution de 1 à 40 % de résine synthétique durcissable dans de l'eau et/ou dans un solvant organique et ensuite, on traite thermiquement pendant 2 à 30 minutes entre 80 et 200°C, en choisissant la concentration de la solution de façon à former une couche de résine synthétique de 0,2 à 5 µm d'épaisseur.
  2. Procédé selon la revendication 1 caractérisé en ce que la solution contient 5 à 25 % en poids d'une résine synthétique thermodurcissable.
  3. Procédé selon la revendication 1 ou 2 caractérisé en ce qu'on utilise comme résine synthétique des résines alkydes, des résines acryliques et des résines phénoliques.
EP91113185A 1990-08-27 1991-08-06 Procédé d'amélioration de la résistance à la corrosion d'objets en acier nitrocarburisé Expired - Lifetime EP0472957B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4027011 1990-08-27
DE4027011A DE4027011A1 (de) 1990-08-27 1990-08-27 Verfahren zur verbesserung der korrosionsbestaendigkeit nitrocarburierter bauteile aus eisenwerkstoffen

Publications (2)

Publication Number Publication Date
EP0472957A1 EP0472957A1 (fr) 1992-03-04
EP0472957B1 true EP0472957B1 (fr) 1995-10-11

Family

ID=6412980

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91113185A Expired - Lifetime EP0472957B1 (fr) 1990-08-27 1991-08-06 Procédé d'amélioration de la résistance à la corrosion d'objets en acier nitrocarburisé

Country Status (9)

Country Link
US (1) US5288340A (fr)
EP (1) EP0472957B1 (fr)
JP (1) JPH04244261A (fr)
AT (1) ATE129024T1 (fr)
BR (1) BR9103660A (fr)
CA (1) CA2049829C (fr)
DE (2) DE4027011A1 (fr)
ES (1) ES2077741T3 (fr)
HK (1) HK31297A (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6264317B1 (en) 1999-11-19 2001-07-24 Lexmark International, Inc. Corrosion resistant printhead body for ink jet pen
DE10126937C2 (de) * 2001-06-01 2003-11-27 Federal Mogul Burscheid Gmbh Gleitringdichtung mit einer Oxid-Nitrid-Verbundschicht
DE102006054280B4 (de) * 2006-11-17 2011-01-05 Durferrit Gmbh Verfahren und Vorrichtung zur Erhöhung der Korrosionsbeständigkeit nitrocarburierter oder nitrocarburierter und oxidierter Oberflächen von aus Stahl bestehenden Bauteilen
US7622197B2 (en) * 2006-11-20 2009-11-24 Ferroxy-Aled, Llc Seasoned ferrous cookware
DE102007060085B4 (de) * 2007-12-13 2012-03-15 Durferrit Gmbh Verfahren zur Erzeugung von korrosionsbeständigen Oberflächen nitrierter oder nitrocarburierter Bauteile aus Stahl sowie nitrocarburierte oder nitrierte Bauteile aus Stahl mit oxidierten Oberflächen
FR2925524B1 (fr) * 2007-12-21 2010-01-22 Durferrit Gmbh Procede et dispositif pour augmenter la resistance a la corrosion de surfaces nitrocarburees et oxydees de pieces en acier
DE102013226091A1 (de) 2013-12-16 2015-06-18 Robert Bosch Gmbh Zylindertrommel einer hydrostatischen Axialkolbenmaschine mit einer Verschleißschutzschicht
FR3030578B1 (fr) * 2014-12-23 2017-02-10 Hydromecanique & Frottement Procede de traitement superficiel d'une piece en acier par nitruration ou nitrocarburation, oxydation puis impregnation

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876453A (en) * 1971-12-25 1975-04-08 Riken Light Metal Ind Co Method for painting aluminium or aluminium-based alloy material
DE2934113C2 (de) * 1979-08-23 1985-05-09 Degussa Ag, 6000 Frankfurt Verfahren zur Erhöhung der Korrosionsbeständigkeit nitrierter Bauteile aus Eisenwerkstoffen
BR8107846A (pt) * 1980-12-03 1982-09-08 Lucas Industries Ltd Componente metalico de aco
DE3123763C1 (de) * 1981-06-16 1982-12-09 Th. Goldschmidt Ag, 4300 Essen Verfahren zum Aufbringen einer Grundierschicht auf Metalloberflächen
US4496401A (en) * 1981-10-15 1985-01-29 Lucas Industries Corrosion resistant steel components and method of manufacture thereof
GB8310102D0 (en) * 1983-04-14 1983-05-18 Lucas Ind Plc Corrosion resistant steel components
US4756774A (en) * 1984-09-04 1988-07-12 Fox Steel Treating Co. Shallow case hardening and corrosion inhibition process
US4748055A (en) * 1986-01-13 1988-05-31 Ashland Oil, Inc. Method for forming a self-healing corrosion preventative film
US5037491A (en) * 1986-02-28 1991-08-06 Fox Patrick L Shallow case hardening and corrosion inhibition process
US4950365A (en) * 1988-12-22 1990-08-21 Vac-Tec Systems, Inc. Corrosion free hard coated metal substrates
US5104742A (en) * 1989-05-10 1992-04-14 Ashland Oil, Inc. Water based coating for roughened metal surfaces

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Technology of Paints, Varnishes and Lacquers; Seiten 46, 71, 124, 125 *

Also Published As

Publication number Publication date
EP0472957A1 (fr) 1992-03-04
JPH04244261A (ja) 1992-09-01
ES2077741T3 (es) 1995-12-01
DE4027011A1 (de) 1992-03-05
HK31297A (en) 1997-03-21
CA2049829A1 (fr) 1992-02-28
BR9103660A (pt) 1992-05-19
DE4027011C2 (fr) 1992-10-29
DE59106662D1 (de) 1995-11-16
CA2049829C (fr) 2001-01-16
US5288340A (en) 1994-02-22
ATE129024T1 (de) 1995-10-15

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