EP0472957B1 - Verfahren zur Verbesserung der Korrosionsbeständigkeit nitrocarburierter Bauteile aus Eisenwerkstoffen - Google Patents
Verfahren zur Verbesserung der Korrosionsbeständigkeit nitrocarburierter Bauteile aus Eisenwerkstoffen Download PDFInfo
- 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
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
- C23C8/80—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)
- Other Surface Treatments For Metallic Materials (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Magnetic Record Carriers (AREA)
- Physical Vapour Deposition (AREA)
- Laminated Bodies (AREA)
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 (de) | 1992-03-04 |
EP0472957B1 true EP0472957B1 (de) | 1995-10-11 |
Family
ID=6412980
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91113185A Expired - Lifetime EP0472957B1 (de) | 1990-08-27 | 1991-08-06 | Verfahren zur Verbesserung der Korrosionsbeständigkeit nitrocarburierter Bauteile aus Eisenwerkstoffen |
Country Status (9)
Country | Link |
---|---|
US (1) | US5288340A (pt) |
EP (1) | EP0472957B1 (pt) |
JP (1) | JPH04244261A (pt) |
AT (1) | ATE129024T1 (pt) |
BR (1) | BR9103660A (pt) |
CA (1) | CA2049829C (pt) |
DE (2) | DE4027011A1 (pt) |
ES (1) | ES2077741T3 (pt) |
HK (1) | HK31297A (pt) |
Families Citing this family (8)
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)
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 |
GB2090771B (en) * | 1980-12-03 | 1985-06-05 | Lucas Industries Ltd | Improvements in metal components |
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 |
-
1990
- 1990-08-27 DE DE4027011A patent/DE4027011A1/de active Granted
-
1991
- 1991-08-06 AT AT91113185T patent/ATE129024T1/de not_active IP Right Cessation
- 1991-08-06 DE DE59106662T patent/DE59106662D1/de not_active Expired - Lifetime
- 1991-08-06 EP EP91113185A patent/EP0472957B1/de not_active Expired - Lifetime
- 1991-08-06 ES ES91113185T patent/ES2077741T3/es not_active Expired - Lifetime
- 1991-08-16 US US07/746,427 patent/US5288340A/en not_active Expired - Lifetime
- 1991-08-26 CA CA002049829A patent/CA2049829C/en not_active Expired - Fee Related
- 1991-08-26 BR BR919103660A patent/BR9103660A/pt not_active IP Right Cessation
- 1991-08-26 JP JP3213333A patent/JPH04244261A/ja active Pending
-
1997
- 1997-03-13 HK HK31297A patent/HK31297A/xx not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
Technology of Paints, Varnishes and Lacquers; Seiten 46, 71, 124, 125 * |
Also Published As
Publication number | Publication date |
---|---|
CA2049829C (en) | 2001-01-16 |
CA2049829A1 (en) | 1992-02-28 |
ATE129024T1 (de) | 1995-10-15 |
EP0472957A1 (de) | 1992-03-04 |
BR9103660A (pt) | 1992-05-19 |
DE4027011C2 (pt) | 1992-10-29 |
DE4027011A1 (de) | 1992-03-05 |
ES2077741T3 (es) | 1995-12-01 |
HK31297A (en) | 1997-03-21 |
JPH04244261A (ja) | 1992-09-01 |
DE59106662D1 (de) | 1995-11-16 |
US5288340A (en) | 1994-02-22 |
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