EP1959026B1 - Method for formation of an aluminium diffusion layer form oxidation protection - Google Patents
Method for formation of an aluminium diffusion layer form oxidation protection Download PDFInfo
- Publication number
- EP1959026B1 EP1959026B1 EP08101026.6A EP08101026A EP1959026B1 EP 1959026 B1 EP1959026 B1 EP 1959026B1 EP 08101026 A EP08101026 A EP 08101026A EP 1959026 B1 EP1959026 B1 EP 1959026B1
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- Prior art keywords
- component
- aluminum
- masking
- accordance
- treated
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Classifications
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- 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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/04—Diffusion into selected surface areas, e.g. using masks
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- 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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/18—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions
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- 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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/18—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions
- C23C10/20—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions only one element being diffused
- C23C10/24—Salt bath containing the element to be diffused
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- 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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/60—After-treatment
Definitions
- the invention relates to a method for forming an aluminum diffusion layer for the oxidation protection of metallic components, in particular consisting of a nickel-based alloy components of an aircraft gas turbine.
- Certain engine components such as the hot gas flow nickel-base alloy rotor and stator blades of the turbine, are significantly attacked during operation by oxidation processes, so that the life of the blades is reduced and the blades must be replaced or repaired ,
- a known oxidation protection principle for such components is that by accumulating aluminum in a near-surface region of the base material on the component surface to be protected by aluminum diffusing to the surface, an aluminum oxide protective layer is formed, which is intended to prevent further oxidation.
- the known diffusion methods are on the one hand in terms of cost disadvantageous, and indeed insofar as obtained in the diffusion from the aluminum powder in the pack-Alit Schl in large quantities of aluminum scrap and on the other hand, the diffusion in vacuum according to the CVD method is complex in terms of equipment and handling.
- EP-A-1 013 787 describes a method for coating a metallic surface in which a masking for removing an oxidation layer takes place.
- EP-A-0 843 026 discloses a method for plating a coating on a component of a gas turbine, in which a temporary masking of Cooling channels before applying an aluminum layer by vapor diffusion takes place. During heating, temperatures of 815 to 1100 ° C occur.
- the document EP-A-0 908 538 describes a method in which a turbine component consisting of a nickel-based alloy is masked, first a galvanic layer is formed on the free portions of the masked component, and then the mask is removed from the component to subsequently heat-treat the component ,
- the invention has for its object to provide a method for forming an aluminum diffusion layer in metallic components, which requires a reduced effort and ensures a high component quality.
- the basic idea of the invention is that on the free sections of the masked components in an aprotic solution, ie in a water- and oxygen-free electrolyte with an aluminum anode and the (n) component (s) as the cathode, first an aluminum layer of a certain thickness is trained and the Masking is then removed from the components to then subject the components after a certain temperature-time profile of a heat treatment under inert gas or in a vacuum, wherein the aluminum diffuses into the component and, conversely, alloy components of the component diffuse into the aluminum layer and thereby in the coated sections, an aluminum diffusion layer is formed for later oxidation protection.
- the aluminum coating under the masking takes place in a first method step at low temperature, while after the removal of the masking carried out in a second method step in a third method step, the unmasked component for forming an aluminum diffusion layer of a heat treatment at elevated Temperature is subjected.
- the temperature-time profile, in which the diffusion of aluminum into the component alloy and of alloy constituents in the aluminum layer, is such that the components - after heating to about 400 - 700 ° C and a holding time of up to 2 hours - according to the invention about one hour at about 1100 ° C and then heat treated at about 1030 ° C for about five hours and then cooled in still air.
- the component sections to be coated are cleaned prior to electroplating and treated with an activating agent, preferably nickel chloride.
- the blade roots of the turbine blades exposed by the attachment to the rotor disk of a high mechanical load are covered with metal strips and thus masked against external influences in the further treatment.
- the blade feet can also be arranged in a box or coated with an adhesive.
- an activating agent for example NiCl (or a fluoride, preferably potassium aluminum fluoride), to effect better adhesion of the later electrodeposited aluminum layer.
- the prepared turbine blades are now (preferably within an oxygen-encapsulated Appendix) in an aprotic solution, that is introduced into a water and oxygen-free organic electrolyte with soluble aluminum anodes present therein and galvanically coated in the region of the uncovered blades with pure aluminum in a layer thickness of 5 to 10 .mu.m.
- the masking is exposed in the galvanic coating only very low temperatures (about 300 ° C), so that the cost of the masking and the masking material and the subsequent unmasking is low and the comparatively low temperatures cause no reaction between masking material and base material and by the Masking caused consequential damage in the masked material area can not occur.
- the turbine blades in an oven, in an inert gas atmosphere or in a vacuum, after a heating phase in which the blades are heated to about 600 ° C and held for 1.5 hours at this temperature, initially at 1100 ° for one hour C and then subjected to a heat treatment at 1030 ° C for five hours, in which the aluminum diffused from the electrodeposited aluminum layer in the nickel-based alloy and vice versa, the nickel in the aluminum layer. Thereafter, the blades are cooled in static air in less than 10 minutes.
- the aluminum present on the surface of the thus produced Ni-Al diffusion layer of the airfoil forms an aluminum oxide layer in an oxygen atmosphere, which prevents further oxidation of the blade material under operating conditions of the blades in the engine.
Description
Die Erfindung betrifft ein Verfahren zur Ausbildung einer Aluminium-Diffusionsschicht zum Oxidationsschutz von metallischen Bauteilen, insbesondere von aus einer Nickel-Basis-Legierung bestehenden Bauteilen einer Fluggasturbine.The invention relates to a method for forming an aluminum diffusion layer for the oxidation protection of metallic components, in particular consisting of a nickel-based alloy components of an aircraft gas turbine.
Bestimmte Triebwerksbauteile, wie die mit dem Heißgasstrom beaufschlagten, aus einer Nickelbasis-Legierung bestehenden Rotor- und Statorschaufeln der Turbine, werden während des Betriebes in erheblichem Umfang durch Oxidationsprozesse angegriffen, so dass die Lebensdauer der Schaufeln verringert wird und die Schaufeln ausgetauscht oder repariert werden müssen.Certain engine components, such as the hot gas flow nickel-base alloy rotor and stator blades of the turbine, are significantly attacked during operation by oxidation processes, so that the life of the blades is reduced and the blades must be replaced or repaired ,
Ein bekanntes Oxidationsschutzprinzip für derartige Bauteile besteht darin, dass durch Anreichern von Aluminium in einem oberflächennahen Bereich des Grundwerkstoffs an der zu schützenden Bauteiloberfläche durch zur Oberfläche diffundierendes Aluminium eine Aluminiumoxid-Schutzschicht gebildet wird, die eine weitere Oxidation verhindern soll.A known oxidation protection principle for such components is that by accumulating aluminum in a near-surface region of the base material on the component surface to be protected by aluminum diffusing to the surface, an aluminum oxide protective layer is formed, which is intended to prevent further oxidation.
Bei den bekannten Verfahren zur Erzeugung der Aluminium-Diffusionsschicht wird ein begrenzter, im Triebwerksbetrieb dem Heißgasstrom ausgesetzter Abschnitt des betreffenden Bauteils beim sogenannten "Pack-Alitieren" in Aluminiumpulver und bei der chemischen Gasphasen-Abscheidung (CVD-Verfahren, chemical vapour deposition) im Vakuum in ein aluminiumreiches gasförmiges Medium eingebracht, wobei das Aluminium bei Temperaturen im Bereich zwischen 900 und 1100°C in das Metall diffundiert.In the known processes for producing the aluminum diffusion layer, a limited section of the relevant component exposed to the hot gas flow in engine operation is vacuum-packed in so-called "pack-alitating" in aluminum powder and in chemical vapor deposition (CVD) introduced into an aluminum-rich gaseous medium, wherein the aluminum diffuses at temperatures in the range between 900 and 1100 ° C in the metal.
Anwendungsbedingt dürfen bestimmte, mechanisch hoch beanspruchte Abschnitte der Bauteile, wie zum Beispiel der Schaufelfuß einer Turbinenschaufel, nicht beschichtet werden und müssen daher während des Diffusionsvorgangs abgedeckt (maskiert) werden.Depending on the application, certain sections of the components that are subject to high mechanical stress, such as the blade root of a turbine blade, may not be coated and must therefore be masked during the diffusion process.
Die bekannten Diffusionsverfahren sind zum einen hinsichtlich des Kostenaufwandes nachteilig, und zwar insofern, als bei der Diffusion aus dem Aluminiumpulver beim Pack-Alitieren in großer Menge Aluminiumschrott anfällt und andererseits die Diffusion im Vakuum gemäß dem CVD-Verfahren apparativ und hinsichtlich des Handling aufwendig ist.The known diffusion methods are on the one hand in terms of cost disadvantageous, and indeed insofar as obtained in the diffusion from the aluminum powder in the pack-Alitieren in large quantities of aluminum scrap and on the other hand, the diffusion in vacuum according to the CVD method is complex in terms of equipment and handling.
Aufgrund der hohen Temperaturen während des Diffusionsvorgangs mit einem maskierten Bauteil ist die Maskierung mit einem hohen Aufwand verbunden. Zudem kann beim Maskieren mit einem Kleber aufgrund der hohen Temperaturen Kohlenstoff aus dem Kleber in das Bauteil diffundieren und dessen Festigkeitseigenschaften negativ beeinflussen.Due to the high temperatures during the diffusion process with a masked component masking is associated with a lot of effort. In addition, when masking with an adhesive due to the high temperatures carbon can diffuse from the adhesive into the component and adversely affect its strength properties.
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Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Ausbildung einer Aluminium-Diffusionsschicht in metallischen Bauteilen anzugeben, das einen verringerten Aufwand erfordert und eine hohe Bauteilqualität gewährleistet.The invention has for its object to provide a method for forming an aluminum diffusion layer in metallic components, which requires a reduced effort and ensures a high component quality.
Erfindungsgemäß wird die Aufgabe mit einem Verfahren gemäß den Merkmalen des Patentanspruchs 1 gelöst. Weitere Merkmale zur vorteilhaften Weiterbildung oder zweckmäßigen Ausgestaltung des erfindungsgemäßen Verfahrens ergeben sich aus den Unteransprüchen.According to the invention the object is achieved by a method according to the features of patent claim 1. Further features for advantageous development or expedient embodiment of the method according to the invention will become apparent from the dependent claims.
Der Grundgedanke der Erfindung besteht darin, dass auf den freien Abschnitten der maskierten Bauteile in einer aprotischen Lösung, das heißt in einem wasser- und sauerstofffreien Elektrolyten mit einer Aluminiumanode und dem(n) Bauteil(en) als Kathode, zunächst eine Aluminiumschicht von bestimmter Dicke ausgebildet wird und die Maskierung dann von den Bauteilen entfernt wird, um die Bauteile anschließend nach einem bestimmten Temperatur-Zeit-Profil einer Wärmebehandlung unter Schutzgas oder im Vakuum zu unterziehen, bei der Aluminium in das Bauteil diffundiert und umgekehrt Legierungsbestandteile des Bauteils in die Aluminiumschicht diffundieren und dabei in den beschichteten Abschnitten eine Aluminium-Diffusionsschicht für den späteren Oxidationsschutz ausgebildet wird. Im Unterschied zum Stand der Technik erfolgt die Aluminium-Beschichtung unter der Maskierung in einem ersten Verfahrensschritt bei niedriger Temperatur, während nach dem in einem zweiten Verfahrensschritt vorgenommenen Entfernen der Maskierung in einem dritten Verfahrensschritt das unmaskierte Bauteil zur Ausbildung einer Aluminium-Diffusionsschicht einer Wärmebehandlung bei erhöhter Temperatur unterzogen wird. Das Temperatur-ZeitProfil, bei dem die Diffusion von Aluminium in die Bauteillegierung und von Legierungsbestandteilen in die Aluminiumschicht erfolgt, ist derart, dass die Bauteile - nach einer Erwärmung auf ca. 400 - 700°C und einer Haltezeit von bis zu 2 Stunden - erfindungsgemäß etwa eine Stunde bei ca. 1100°C und anschließend etwa fünf Stunden bei ca. 1030°C wärmebehandelt werden und danach in ruhender Luft abgekühlt werden.The basic idea of the invention is that on the free sections of the masked components in an aprotic solution, ie in a water- and oxygen-free electrolyte with an aluminum anode and the (n) component (s) as the cathode, first an aluminum layer of a certain thickness is trained and the Masking is then removed from the components to then subject the components after a certain temperature-time profile of a heat treatment under inert gas or in a vacuum, wherein the aluminum diffuses into the component and, conversely, alloy components of the component diffuse into the aluminum layer and thereby in the coated sections, an aluminum diffusion layer is formed for later oxidation protection. In contrast to the prior art, the aluminum coating under the masking takes place in a first method step at low temperature, while after the removal of the masking carried out in a second method step in a third method step, the unmasked component for forming an aluminum diffusion layer of a heat treatment at elevated Temperature is subjected. The temperature-time profile, in which the diffusion of aluminum into the component alloy and of alloy constituents in the aluminum layer, is such that the components - after heating to about 400 - 700 ° C and a holding time of up to 2 hours - according to the invention about one hour at about 1100 ° C and then heat treated at about 1030 ° C for about five hours and then cooled in still air.
Aufgrund der in Beschichtungsstärke und -größe kontrollierten galvanischen Beschichtung ist auch eine definierte Ausbildung der Diffusionsschicht möglich, und zwar ohne Maskierung und ohne die Maskierung den für den Diffusionsvorgang erforderlichen hohen Wärmebehandlungstemperaturen aussetzen zu müssen. Die Anforderungen an die Art und Ausführung der bei der galvanischen Beschichtung nur geringen Temperaturen ausgesetzten Maskierung sind geringer als bei den während der Diffusion erforderlichen Maskierungen. Zudem werden auch Folgeschäden an den Bauteilen verhindert, die durch die Wirkung hoher Temperaturen auf das Material der Maskierung bedingt sind.Due to the coating thickness and size controlled galvanic coating and a defined formation of the diffusion layer is possible, without having to expose the masking and without the high heat treatment temperatures required for the diffusion process without masking. The requirements for the type and design of the masking which is exposed only to low temperatures during the galvanic coating are lower than for the maskings required during the diffusion. In addition, consequential damage to the components prevented by the effect of high temperatures on the material of the masking.
Für das Maskierungsmaterial ist lediglich eine Temperaturbeständigkeit bis ca. 400°C erforderlich.For the masking material only a temperature resistance to about 400 ° C is required.
Die zu beschichtenden Bauteilabschnitte werden vor dem Galvanisieren gereinigt und mit einem Aktivierungsmittel, vorzugsweise Nickelchlorid, behandelt.The component sections to be coated are cleaned prior to electroplating and treated with an activating agent, preferably nickel chloride.
Ein Ausführungsbeispiel der Erfindung wird im Folgenden am Beispiel einer aus einem Nickelbasis-Werkstoff bestehenden Turbinenschaufel eines Gasturbinentriebwerks, deren Schaufelblatt zum Schutz vor Oxidation durch die heißen Arbeitsgase eine Aluminiumoxid-Schutzschicht aufweisen soll und deren in Ausnehmungen der Rotorscheibe gehaltener Schaufelfuß frei bleiben muss, näher erläutert.An exemplary embodiment of the invention is explained in more detail below using the example of a turbine blade of a gas turbine engine consisting of a nickel-based material, the blade of which must have an aluminum oxide protective layer for protection against oxidation by the hot working gases and the blade root held in recesses of the rotor disk must remain free ,
Die durch die Befestigung an der Rotorscheibe einer hohen mechanischen Belastung ausgesetzten Schaufelfüße der Turbinenschaufeln werden mit Metallbändern beklebt und so gegenüber äußeren Einwirkungen bei der weiteren Behandlung maskiert. Zur Maskierung können die Schaufelfüße aber auch in einer Box angeordnet oder mit einem Kleber bestrichen sein. Anschließend werden die mechanisch bearbeiteten und gereinigten Turbinenschaufeln mit einem Aktivierungsmittel, beispielsweise NiCl (oder einem Fluorid, vorzugsweise Kalium-Aluminium-Fluorid) behandelt, um eine bessere Haftung der später galvanisch aufgebrachten Aluminiumschicht zu bewirken. Die so vorbereiteten Turbinenschaufeln werden nun (bevorzugt innerhalb einer sauerstoffgekapselten Anlage) in eine aprotische Lösung, das heißt in einen wasser- und sauerstofffreien organischen Elektrolyten mit in diesem befindlichen löslichen Aluminiumanoden eingebracht und im Bereich der nicht abgedeckten Schaufelblätter galvanisch mit Reinaluminium in einer Schichtdicke von 5 bis 10µm beschichtet. Die Maskierung ist bei der galvanischen Beschichtung nur sehr geringen Temperaturen (etwa 300°C) ausgesetzt, so dass der Aufwand für die Maskierung und das Maskierungsmaterial und die spätere Demaskierung gering ist und die vergleichsweise geringen Temperaturen keine Reaktion zwischen Maskierungsmaterial und Grundmaterial bewirken und durch die Maskierung bewirkte Folgeschäden in dem maskierten Werkstoffbereich nicht auftreten können.The blade roots of the turbine blades exposed by the attachment to the rotor disk of a high mechanical load are covered with metal strips and thus masked against external influences in the further treatment. For masking the blade feet can also be arranged in a box or coated with an adhesive. Subsequently, the mechanically machined and cleaned turbine blades are treated with an activating agent, for example NiCl (or a fluoride, preferably potassium aluminum fluoride), to effect better adhesion of the later electrodeposited aluminum layer. The prepared turbine blades are now (preferably within an oxygen-encapsulated Appendix) in an aprotic solution, that is introduced into a water and oxygen-free organic electrolyte with soluble aluminum anodes present therein and galvanically coated in the region of the uncovered blades with pure aluminum in a layer thickness of 5 to 10 .mu.m. The masking is exposed in the galvanic coating only very low temperatures (about 300 ° C), so that the cost of the masking and the masking material and the subsequent unmasking is low and the comparatively low temperatures cause no reaction between masking material and base material and by the Masking caused consequential damage in the masked material area can not occur.
Anschließend werden die Turbinenschaufeln in einem Ofen, und zwar in einer Schutzgasatmosphäre oder auch im Vakuum, nach einer Erwärmungsphase, in der die Schaufeln auf ca. 600°C erwärmt und 1,5 Stunden bei dieser Temperatur gehalten werden, zunächst eine Stunde bei 1100°C und danach fünf Stunden bei 1030°C einer Wärmebehandlung unterzogen, in der das Aluminium aus der galvanisch aufgebrachten Aluminiumschicht in die Nickel-Basis-Legierung und umgekehrt das Nickel in die Aluminiumschicht diffundiert. Danach werden die Schaufeln in weniger als 10 Minuten in ruhender Luft abgekühlt. Das an der Oberfläche der so erzeugten Ni-Al-Diffusionsschicht des Schaufelblatts befindliche Aluminium bildet in einer Sauerstoffatmosphäre eine Aluminiumoxidschicht, die unter Betriebsbedingungen der Schaufeln im Triebwerk eine weitere Oxidation des Schaufelmaterials verhindert.Subsequently, the turbine blades in an oven, in an inert gas atmosphere or in a vacuum, after a heating phase in which the blades are heated to about 600 ° C and held for 1.5 hours at this temperature, initially at 1100 ° for one hour C and then subjected to a heat treatment at 1030 ° C for five hours, in which the aluminum diffused from the electrodeposited aluminum layer in the nickel-based alloy and vice versa, the nickel in the aluminum layer. Thereafter, the blades are cooled in static air in less than 10 minutes. The aluminum present on the surface of the thus produced Ni-Al diffusion layer of the airfoil forms an aluminum oxide layer in an oxygen atmosphere, which prevents further oxidation of the blade material under operating conditions of the blades in the engine.
Claims (6)
- Method for the production of an aluminum diffusion coating for oxidation protection of metallic components, in particular of aircraft gas-turbine components made of a nickel-base alloy, by forming an aluminum-oxide protective coating, with the component being coated with pure aluminum in a water and oxygen-free organic electrolyte by electro-plating and the component being heat-treated according to a predetermined high-temperature - time graph, with the components for aluminum diffusion being first heated to approx. 400 to 700°C and held at this temperature for up to two hours, characterized in that certain portions of the component are first masked and that aluminum applied to the free surfaces of the component diffuses into surface-near zones of the component, with the component with masking being coated in a first process step with pure aluminum in the water and oxygen-free organic electrolyte by electro-plating, the masking being subsequently removed in a second process step and the unmasked component then being heat-treated in a third process step in an inert gas atmosphere or in vacuum according to the predetermined high-temperature - time graph, with the components being heat-treated for one hour at 1100°C and for 5 hours at 1030°C, followed by cooling in undisturbed air, with aluminum diffusing into the component and alloy elements of the component diffusing in opposite direction into the aluminum coating.
- Method in accordance with Claim 1, characterized in that the masking consists of below 400°C heat-resistant adhesives or synthetics or bonded metal tapes.
- Method in accordance with Claim 1, characterized in that the component portions to be coated are cleaned and treated with an activator prior to electro-plating.
- Method in accordance with Claim 3, characterized in that the activator is nickel chloride.
- Method in accordance with Claim 1, characterized in that the unmasked portions of the component are coated in the aprotic electrolyte to a coat thickness of 5 to 10 µm.
- Method in accordance with Claim 5, characterized in that the aluminum coating produced by electro-plating is subsequently treated in a pickling agent.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007008011A DE102007008011A1 (en) | 2007-02-15 | 2007-02-15 | Process for forming an aluminum diffusion layer for oxidation protection |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1959026A2 EP1959026A2 (en) | 2008-08-20 |
| EP1959026A3 EP1959026A3 (en) | 2009-05-06 |
| EP1959026B1 true EP1959026B1 (en) | 2013-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08101026.6A Expired - Fee Related EP1959026B1 (en) | 2007-02-15 | 2008-01-29 | Method for formation of an aluminium diffusion layer form oxidation protection |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20080272004A1 (en) |
| EP (1) | EP1959026B1 (en) |
| DE (1) | DE102007008011A1 (en) |
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| WO2011118663A1 (en) * | 2010-03-25 | 2011-09-29 | 株式会社Ihi | Method for forming oxidation resistant coating layer |
| US8778164B2 (en) | 2010-12-16 | 2014-07-15 | Honeywell International Inc. | Methods for producing a high temperature oxidation resistant coating on superalloy substrates and the coated superalloy substrates thereby produced |
| DE102011011200A1 (en) | 2011-02-14 | 2012-08-16 | Dechema Gesellschaft Für Chemische Technik Und Biotechnologie E.V. | Producing a metal edge zone of a metal component enriched with at least one additional element comprises inward diffusion of the additional elements from a metal film in the metallic substrate, surrounding the component |
| US9771661B2 (en) | 2012-02-06 | 2017-09-26 | Honeywell International Inc. | Methods for producing a high temperature oxidation resistant MCrAlX coating on superalloy substrates |
| US10087540B2 (en) | 2015-02-17 | 2018-10-02 | Honeywell International Inc. | Surface modifiers for ionic liquid aluminum electroplating solutions, processes for electroplating aluminum therefrom, and methods for producing an aluminum coating using the same |
| CN108624839A (en) * | 2018-06-22 | 2018-10-09 | 中国科学院上海应用物理研究所 | A kind of preparation method of stainless steel aluminized coating |
| DE102018218062A1 (en) * | 2018-10-22 | 2020-04-23 | Heraeus Nexensos Gmbh | Sleeve for covering a sensor, method for producing a sleeve for covering a sensor and a temperature measuring device with a sleeve for covering a sensor |
| US11661849B2 (en) * | 2021-02-12 | 2023-05-30 | Garrett Transportation I Inc. | Turbocharger turbine wheels having an alpha-alumina coating and methods for manufacturing the same |
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| US4101386A (en) * | 1971-05-07 | 1978-07-18 | Siemens Aktiengesellschaft | Methods of coating and surface finishing articles made of metals and their alloys |
| US3969195A (en) * | 1971-05-07 | 1976-07-13 | Siemens Aktiengesellschaft | Methods of coating and surface finishing articles made of metals and their alloys |
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| EP0148122B1 (en) * | 1983-12-23 | 1988-04-27 | Eltech Systems Corporation | Coating for metallic substrates, method of production and use of the coating |
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| SU1615233A1 (en) * | 1988-09-28 | 1990-12-23 | Предприятие П/Я М-5612 | Method of applying heat resistant coating |
| EP0504705A1 (en) * | 1991-03-20 | 1992-09-23 | Siemens Aktiengesellschaft | Pretreatment of metallic material for the electrodeposition coating with metal |
| RU95110753A (en) * | 1992-10-05 | 1997-01-27 | Сименс АГ (DE) | Protection against corrosive and erosive effects for substrate made of chromium steel at temperatures up to about 500 c |
| JP3471046B2 (en) * | 1993-08-12 | 2003-11-25 | 富士通株式会社 | Printed circuit board manufacturing method |
| JP3390776B2 (en) * | 1995-03-20 | 2003-03-31 | 新次 辻 | Surface modification method for steel using aluminum diffusion dilution |
| US5800695A (en) * | 1996-10-16 | 1998-09-01 | Chromalloy Gas Turbine Corporation | Plating turbine engine components |
| US6022632A (en) * | 1996-10-18 | 2000-02-08 | United Technologies | Low activity localized aluminide coating |
| US5985122A (en) * | 1997-09-26 | 1999-11-16 | General Electric Company | Method for preventing plating of material in surface openings of turbine airfoils |
| US6203847B1 (en) * | 1998-12-22 | 2001-03-20 | General Electric Company | Coating of a discrete selective surface of an article |
| DE10044067A1 (en) * | 2000-09-07 | 2002-04-04 | Ks Kolbenschmidt Gmbh | Making wear- and heat- resistant, diffusion-inhibiting surface layer for ferrous metals, especially for use in casting, coats and anodizes aluminum layer |
| DE10149928C1 (en) * | 2001-10-10 | 2002-12-12 | Wkw Erbsloeh Automotive Gmbh | Process for treating the surface of a workpiece made from aluminum or aluminum alloy used in the manufacture of car trims comprises polishing the workpiece in an aqueous electrolyte by applying an electrical direct voltage |
| EP1365039A1 (en) * | 2002-05-24 | 2003-11-26 | ALSTOM (Switzerland) Ltd | Process of masking colling holes of a gas turbine component |
| US6652914B1 (en) * | 2002-09-27 | 2003-11-25 | General Electric Aviation Service Operation Pte. Ltd. | Method for selective surface protection of a gas turbine blade which has previously been in service |
| DE10246614A1 (en) * | 2002-10-07 | 2004-04-15 | Benteler Automobiltechnik Gmbh | Method of making vehicle component with metallic coating from steel sheet or strip, involves coating metal from non-aqueous organic solution before cold forming, hot forming and hardening |
| EP1688517B1 (en) * | 2005-02-03 | 2011-01-12 | Ford-Werke GmbH | Process of manufacturing a metallic adhesive layer on a cast piece |
| US7597934B2 (en) * | 2006-02-21 | 2009-10-06 | General Electric Company | Corrosion coating for turbine blade environmental protection |
| US7749570B2 (en) * | 2006-12-20 | 2010-07-06 | General Electric Company | Method for depositing a platinum-group-containing layer on a substrate |
-
2007
- 2007-02-15 DE DE102007008011A patent/DE102007008011A1/en not_active Withdrawn
-
2008
- 2008-01-29 EP EP08101026.6A patent/EP1959026B1/en not_active Expired - Fee Related
- 2008-02-15 US US12/071,067 patent/US20080272004A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP1959026A3 (en) | 2009-05-06 |
| DE102007008011A1 (en) | 2008-08-21 |
| EP1959026A2 (en) | 2008-08-20 |
| US20080272004A1 (en) | 2008-11-06 |
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