EP1573095B1 - Method for removing at least one surface area of at least two components - Google Patents

Method for removing at least one surface area of at least two components Download PDF

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Publication number
EP1573095B1
EP1573095B1 EP03788843A EP03788843A EP1573095B1 EP 1573095 B1 EP1573095 B1 EP 1573095B1 EP 03788843 A EP03788843 A EP 03788843A EP 03788843 A EP03788843 A EP 03788843A EP 1573095 B1 EP1573095 B1 EP 1573095B1
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Prior art keywords
component
gas
electrolyte
surface region
components
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EP03788843A
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German (de)
French (fr)
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EP1573095A1 (en
Inventor
Daniel Körtvelyessy
Ursus KRÜGER
Ursula Michelsen-Mohammadein
Ralph Reiche
Marc De Vogelaere
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Siemens AG
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Siemens AG
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F5/00—Electrolytic stripping of metallic layers or coatings
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling

Definitions

  • the invention relates to a method for removing at least one surface region of a component according to claim 1.
  • WO 02/103088 A1 discloses a method for local stripping of components.
  • Surface areas of a component (substrate, layer) or portions of a component that are a layer that are, for example, corroded and that are to be removed can be removed in various ways. This can be done by sand blasting, chemical etching or other methods. However, these methods are very expensive and often undesirably damage the substrate or components.
  • the object is achieved by a method for removing at least one surface area according to claim 1.
  • FIG. 1 shows a device 1 with which an electrolytic process can be carried out.
  • an electrolyte 7 is arranged, in which in turn a component 10 (acts as an electrode), in which a surface area is to be removed, and an electrode 13 are arranged.
  • the component 10 and the electrode 13 are electrically connected to a current / voltage source 16 with each other.
  • the component 10 forms, for example, the cathode with a negative potential of, for example, -1.086 volts.
  • the electrode 13 is then the anode.
  • the component 10 may also be the anode and the electrode 13 may be the cathode.
  • the at least one component 10 does not necessarily have to be an electrode (ie part of a current or voltage circuit) which is operated in the electrolytic circuit. It is also possible to use two electrodes 13, 13 'for the electrolysis, wherein the at least one component 10 is arranged only in the electrolyte 7 (FIG. 6).
  • the component 10 interacts with the gas that forms during the electrolysis.
  • the electrolyte 7 is, for example, an aqueous solution of acids and / or bases.
  • the electrolyte 7 may also be a nonaqueous solution or melt (for example molten salt).
  • two components 10, 10 ' in which a surface area is to be removed, constitute the two electrodes necessary for the electrolysis (FIG. 7).
  • a chemical reaction takes place at both electrodes 13, 13 '(components 10, 10'), ie at one of them an oxidation and at the other a reduction.
  • gas can form which, according to the invention (FIGS. 2, 3, 4, 5), interacts with the component 10, 10'.
  • the gas that forms on the two electrodes 10, 10 '(components) may be the same or different.
  • the electrolyte salt for electrolysis nitrogen compounds such. As ammonium nitrite used.
  • both the cation and the anion in the electrolyte contains nitrogen atoms, according to the invention in the electrolysis at a suitably selected pH and potentials between the electrodes 13, 13 '(components 10, 10'), both at the cathode and at the anode nitrogen gas ,
  • the efficiency of the method is increased.
  • nitrogen as a gas is less dangerous than oxygen and hydrogen or their mixtures.
  • the component 10, 1ü ' is for example a nickel- or cobalt-based superalloy, in particular for gas turbine parts, such as. As turbine blades, with corroded areas on the surface.
  • the component 10, 10 ' may be a substrate 31 (FIG. 3) having an MCrAlY layer 34 (FIG. 3) that is oxidized or degraded.
  • This layer 34 then represents at least one surface area 19 to be removed. Due to their degradation, the surface areas 19, which are present multiple times, exhibit defects 28 such as undercuts, notches, cracks, microcracks, lattice defects, grain boundaries and others (FIG. 2).
  • FIG. 3 shows the diffusion of the gas forming, for example, in the electrolyte 7 into the component 10. Due to the electrolysis, a gas is formed, for example hydrogen, which surrounds the component 10 as an electrode or as an additional arrangement in the electrolyte 7. The hydrogen can diffuse into the component 10, in particular into closed pores 37. The pore 37 likewise forms a gas bubble 25, the pressure of which continues to increase until it leads to the formation of cracks 22.
  • a gas for example hydrogen
  • FIG. 4 shows surface regions 19 of a component 10 which has a layer 34.
  • the component 10 consists for example of a substrate 31 and the layer 34.
  • the layer 34 or parts of the layer 34 represent, for example, the surface area 19 which is to be removed.
  • the substrate 31 is, for example, a superalloy and has at least one layer 34, such as an MCrAlY and / or a ceramic layer.
  • the degradation of the layer 34 can also lead to defects 28, such as cracks or separations in the boundary region between substrate 31 and layer 34, in which the gas can accumulate and weakens the material around the crack or flaw 28, so that the crack can continue to grow until the crack growth leads to flaking of the layer 34 in the boundary region between the substrate 31 and layer 34.
  • FIG. 5 shows the effect of the diffusion of a gas from the electrolyte into a component 10.
  • the surface area 19 to be removed may be part of a substrate 31 or a layer 34.
  • the gas for example hydrogen, which forms in the electrolyte 7 and / or already exists or is supplied, diffuses into the metallic regions of the component 10 and can locally recombine.
  • projections 37 which are formed by notches and undercuts, form a large surface area with the electrolyte 7 or the environment and thus a large contact area for the gas, for example hydrogen.
  • the gas can diffuse into the protrusion 37 from all sides, and the protrusion 37 is gas enriched much faster than other regions.
  • the diffusion of gas into the component 10 leads to a loosening of the metallic structure in the component 10 up to crack formation 22.
  • the component 10 with the surface region 19 can be taken out and in particular quickly heated by laser or inductive heating so that diffusion of the gas from the material of the component 10 does not occur due to the short time of heating or hardly takes place.
  • the gas pressure also increases without the need for further gas supply. The effect is the same, namely that cracks 22 are generated in the surface area 19.
  • the component 10 can additionally, for example. For heating, exposed to a vacuum, so that the pressure difference between the gas bubble 25 and component 10 is greater and the process is accelerated.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Entfernen von zumindest einem Oberflächenbereich eines Bauteils gemäß Anspruch 1.The invention relates to a method for removing at least one surface region of a component according to claim 1.

Die WO 02/103088 A1 offenbart ein Verfahren zum lokalen Entschichten von Bauteilen.WO 02/103088 A1 discloses a method for local stripping of components.

Aus den Werkstoffblättern 500 (12.77) der Mannesmann Röhren Werke über druckwasserstoffbeständige Stähle ist bekannt, dass aus wässrigen Lösungen unter bestimmten Bedingungen Wasserstoff ohne weitere chemische Reaktion ins Metall aufgenommen wird, wobei eine Versprödung des Metalls und eine Lockerung des Gefüges auftreten können.From the material sheets 500 (12.77) of Mannesmann tube works on pressure hydrogen-resistant steels is known that from aqueous solutions under certain conditions hydrogen is added without further chemical reaction in the metal, whereby embrittlement of the metal and a loosening of the structure may occur.

Oberflächenbereiche eines Bauteils (Substrat, Schicht) oder Teilbereiche eines Bauteils, die eine Schicht sind, die beispielsweise korrodiert sind und die entfernt werden sollen, können auf verschiedene Art und Weise entfernt werden.
Dies kann durch Sandstrahlen, chemisches Ätzen oder andere Verfahren erfolgen.
Diese Verfahren sind jedoch sehr aufwändig und beschädigen oft in unerwünschter Weise das Substrat oder Bauteile.Surface areas of a component (substrate, layer) or portions of a component that are a layer that are, for example, corroded and that are to be removed can be removed in various ways.
This can be done by sand blasting, chemical etching or other methods.
However, these methods are very expensive and often undesirably damage the substrate or components.

Es ist daher Aufgabe der Erfindung ein Verfahren der eingangs genannten Art aufzuzeigen, das die obengenannten Probleme überwindet.It is therefore an object of the invention to provide a method of the type mentioned, which overcomes the above problems.

Die Aufgabe wird gelöst durch ein Verfahren zum Entfernen von zumindest einem Oberflächenbereich gemäß Anspruch 1.The object is achieved by a method for removing at least one surface area according to claim 1.

Weitere vorteilhafte Verfahrensschritte oder Parameter sind in den Unteransprüchen aufgelistet.
Die Verfahrensschritte in den Unteransprüchen können miteinander in vorteilhafter Weise kombiniert werden.Further advantageous method steps or parameters are listed in the subclaims.
The method steps in the subclaims can be combined with each other in an advantageous manner.

Es zeigen

  • Figur 1, 6 und 7 jeweils eine Vorrichtung, mit der ein elektrolytisches Verfahren durchgeführt werden kann, und
  • Figur 2 eine Gasblase in einer Fehlstelle eines Oberflächenbereichs,
  • Figur 3 Gasblasenbildung in geschlossenen Poren eines Oberflächenbereichs,
  • Figur 4 eine Fehlstelle zwischen einer Schicht und einem Substrat, und
  • Figur 5 den Effekt von Gasdiffusion in Oberflächenbereiche eines Bauteils.
Show it
  • Figures 1, 6 and 7 each show a device with which an electrolytic process can be carried out, and
  • FIG. 2 shows a gas bubble in a defect of a surface area,
  • FIG. 3 gas bubble formation in closed pores of a surface area, FIG.
  • Figure 4 shows a defect between a layer and a substrate, and
  • FIG. 5 shows the effect of gas diffusion in surface regions of a component.

Figur 1 nach Stand der Technik zeigt eine Vorrichtung 1, mit der ein elektrolytisches Verfahren durchgeführt werden kann.FIG. 1 shows a device 1 with which an electrolytic process can be carried out.

In einem Behälter 4 ist ein Elektrolyt 7 angeordnet, in dem wiederum ein Bauteil 10 (wirkt als Elektrode), bei dem ein Oberflächenbereich entfernt werden soll, und eine Elektrode 13 angeordnet sind.
Das Bauteil 10 und die Elektrode 13 sind elektrisch leitend mit einer Strom/Spannungsquelle 16 miteinander verbunden. Das Bauteil 10 bildet bspw. die Kathode mit einem negativen Potenzial von beispielsweise -1,086 Volt.
Die Elektrode 13 ist dann die Anode.
Das Bauteil 10 kann auch die Anode und die Elektrode 13 die Kathode sein.In a container 4, an electrolyte 7 is arranged, in which in turn a component 10 (acts as an electrode), in which a surface area is to be removed, and an electrode 13 are arranged.
The component 10 and the electrode 13 are electrically connected to a current / voltage source 16 with each other. The component 10 forms, for example, the cathode with a negative potential of, for example, -1.086 volts.
The electrode 13 is then the anode.
The component 10 may also be the anode and the electrode 13 may be the cathode.

Das zumindest eine Bauteil 10 muss nicht notwendigerweise eine Elektrode (also Teil eines Strom- oder Spannungskreises) sein, die in dem elektrolytischen Stromkreis betrieben wird. Es können auch zwei Elektroden 13, 13' für die Elektrolyse verwendet werden, wobei das zumindest eine Bauteil 10 nur in dem Elektrolyt 7 angeordnet ist (Fig. 6).The at least one component 10 does not necessarily have to be an electrode (ie part of a current or voltage circuit) which is operated in the electrolytic circuit. It is also possible to use two electrodes 13, 13 'for the electrolysis, wherein the at least one component 10 is arranged only in the electrolyte 7 (FIG. 6).

In allen Fällen ist es wesentlich, dass das Bauteil 10 mit dem Gas, das sich bei der Elektrolyse bildet, in Wechselwirkung tritt.In all cases, it is essential that the component 10 interacts with the gas that forms during the electrolysis.

Der Elektrolyt 7 ist beispielsweise eine wässrige Lösung aus Säuren und/oder Basen.
Der Elektrolyt 7 kann auch eine nichtwässrige Lösung oder Schmelze (bspw. Salzschmelze) sein.The electrolyte 7 is, for example, an aqueous solution of acids and / or bases.
The electrolyte 7 may also be a nonaqueous solution or melt (for example molten salt).

Erfindungsgemäss stellen zwei Bauteile 10, 10', bei denen ein Oberflächenbereich entfernt werden soll, die zwei für die Elektrolyse notwendigen Elektroden dar (Fig. 7).According to the invention, two components 10, 10 ', in which a surface area is to be removed, constitute the two electrodes necessary for the electrolysis (FIG. 7).

An beiden Elektroden 13, 13' (Bauteile 10, 10') läuft eine chemische Reaktion ab, d.h. an der einen eine Oxidation und an der anderen eine Reduktion. Bei beiden Bauteilen 10, 10' kann sich Gas bilden, das erfindungsgemäss (Fig. 2, 3, 4, 5) mit dem Bauteil 10, 10' in Wechselwirkung tritt. Das Gas, das sich an den beiden Elektroden 10, 10' (Bauteilen) bildet kann dasselbe sein oder auch verschieden sein.
Als Elektrolytsalz für die Elektrolyse werden hier Stickstoffverbindungen, wie z. B. Ammoniumnitrit, verwendet. Da sowohl das Kation als auch das Anion im Elektrolyten Stickstoffatome beinhaltet, entsteht erfindungsgemäß bei der Elektrolyse bei geeignet gewähltem pH-Wert und Potenzialen zwischen den Elektroden 13, 13' (Bauteilen 10, 10') sowohl an der Kathode als auch an der Anode Stickstoffgas.A chemical reaction takes place at both electrodes 13, 13 '(components 10, 10'), ie at one of them an oxidation and at the other a reduction. In the case of both components 10, 10 ', gas can form which, according to the invention (FIGS. 2, 3, 4, 5), interacts with the component 10, 10'. The gas that forms on the two electrodes 10, 10 '(components) may be the same or different.
As the electrolyte salt for electrolysis nitrogen compounds such. As ammonium nitrite used. Since both the cation and the anion in the electrolyte contains nitrogen atoms, according to the invention in the electrolysis at a suitably selected pH and potentials between the electrodes 13, 13 '(components 10, 10'), both at the cathode and at the anode nitrogen gas ,

Da die Bauteile 10, 10', die zu entfernende Oberflächenbereiche 19 aufweisen, gleichzeitig als Anode und Kathode verwendet werden, wird die Effizienz des Verfahrens erhöht.
Darüber ist Stickstoff als Gas weniger gefährlich als Sauerstoff und Wasserstoff bzw. deren Gemische.Since the components 10, 10 'having surface portions 19 to be removed are simultaneously used as the anode and the cathode, the efficiency of the method is increased.
In addition, nitrogen as a gas is less dangerous than oxygen and hydrogen or their mixtures.

Das Bauteil 10, 1ü' ist beispielsweise eine Nickel- oder Kobaltbasierte Superlegierung, insbesondere für Gasturbinenteile, wie z. B. Turbinenschaufeln, mit korrodierten Bereichen an der Oberfläche.
Ebenso kann das Bauteil 10, 10' ein Substrat 31 (Fig. 3) mit einer MCrAlY-Schicht 34 (Fig. 3) sein, die oxidiert oder degradiert ist. Diese Schicht 34 stellt dann zumindest einen zu entfernenden Oberflächenbereich 19 dar.
Die beispielsweise mehrfach vorhandenen Oberflächenbereiche 19 weisen durch ihre Degradation Fehlstellen 28 wie z.B. Hinterschneidungen, Kerben, Risse, Mikrorisse, Gitterfehlstellen, Korngrenzen u.a. auf (Figur 2).The component 10, 1ü 'is for example a nickel- or cobalt-based superalloy, in particular for gas turbine parts, such as. As turbine blades, with corroded areas on the surface.
Similarly, the component 10, 10 'may be a substrate 31 (FIG. 3) having an MCrAlY layer 34 (FIG. 3) that is oxidized or degraded. This layer 34 then represents at least one surface area 19 to be removed.
Due to their degradation, the surface areas 19, which are present multiple times, exhibit defects 28 such as undercuts, notches, cracks, microcracks, lattice defects, grain boundaries and others (FIG. 2).

Bei geeigneter Wahl des Elektrolyts 7 sowie dessen Konzentration und der Potenziale der Elektroden 13, 13' (bzw. 10', 10') erfolgt an den Bauteilen 10, 10' in den Fehlstellen 28 eine Gasbildung. Einige der im Elektrolyt 7 enthaltenen Ionenarten entladen sich an den Bauteile 10, 10' und bilden dabei ein Gas, erfindungsgemäß stickstoff, das innerhalb der Fehlstellen 28 Gasblasen 25 bildet. Stickstoff bildet sich aus einem beispielsweise nichtwässrigen Elektrolyten 7.
Der Gasdruck in den Gasblasen 25 steigt mit der Zeit an, insbesondere dynamisch (überproportional), solange eine Spannung an den Elektroden 13, 13' (Bauteile 10, 10') anliegt, da immer mehr Gas gebildet wird. Der Gasdruck erzeugt in dem Oberflächenbereich 19 mechanische Spannungen, die zur Bildung von Rissen 22 in dem Oberflächenbereich 19 führen. Durch diese Rissbildung kommt es zum Abplatzen von Teilen des Oberflächenbereichs 19 und zur Entfernung des Oberflächenbereichs 19.With a suitable choice of the electrolyte 7 and its concentration and the potentials of the electrodes 13, 13 '(or 10', 10 ') takes place at the components 10, 10' in the defects 28, a gas formation. Some of the types of ions contained in the electrolyte 7 discharge at the components 10, 10 'and thereby form a gas, nitrogen according to the invention, which forms gas bubbles 25 within the defects 28. Nitrogen forms from, for example, a nonaqueous electrolyte 7.
The gas pressure in the gas bubbles 25 increases over time, in particular dynamically (disproportionately) as long as a voltage is applied to the electrodes 13, 13 '(components 10, 10'), since more and more gas is formed. The gas pressure generates mechanical stresses in the surface area 19, leading to the formation of cracks 22 in the surface area 19. As a result of this cracking, parts of the surface area 19 are flaked off and the surface area 19 is removed.

Figur 3 zeigt die Diffusion des sich bspw. im Elektrolyt 7 bildenden Gases in das Bauteil 10.
Aufgrund der Elektrolyse bildet sich ein Gas, beispielsweise Wasserstoff, das das Bauteil 10 als Elektrode oder als zusätzliche Anordnung im Elektrolyt 7 umgibt.
Der Wasserstoff kann in das Bauteil 10 hineindiffundieren, insbesondere in geschlossene Poren 37. In der Pore 37 bildet sich ebenfalls eine Gasblase 25, deren Druck immer weiter ansteigt bis dieser zur Bildung von Rissen 22 führt.FIG. 3 shows the diffusion of the gas forming, for example, in the electrolyte 7 into the component 10.
Due to the electrolysis, a gas is formed, for example hydrogen, which surrounds the component 10 as an electrode or as an additional arrangement in the electrolyte 7.
The hydrogen can diffuse into the component 10, in particular into closed pores 37. The pore 37 likewise forms a gas bubble 25, the pressure of which continues to increase until it leads to the formation of cracks 22.

Figur 4 zeigt Oberflächenbereiche 19 eines Bauteils 10, das eine Schicht 34 aufweist.
Das Bauteil 10 besteht beispielsweise aus einem Substrat 31 und der Schicht 34. Die Schicht 34 oder Teile der Schicht 34 stellen bspw. den Oberflächenbereich 19 dar, der entfernt werden soll.
Das Substrat 31 ist bspw. eine Superlegierung und weist zumindest eine Schicht 34 auf, wie z.B. eine MCrAlY und/oder eine keramische Schicht.FIG. 4 shows surface regions 19 of a component 10 which has a layer 34.
The component 10 consists for example of a substrate 31 and the layer 34. The layer 34 or parts of the layer 34 represent, for example, the surface area 19 which is to be removed.
The substrate 31 is, for example, a superalloy and has at least one layer 34, such as an MCrAlY and / or a ceramic layer.

Insbesondere kann es durch die Degradation der Schicht 34 auch zu Fehlstellen 28, wie Risse oder Trennungen im Grenzbereich zwischen Substrat 31 und Schicht 34 kommen, in dem sich das Gas ansammeln kann und das Material um den Riss oder Fehlstelle 28 schwächt, so dass der Riss weiterwachsen kann bis das Risswachstum zum Abplatzen der Schicht 34 im Grenzbereich zwischen Substrat 31 und Schicht 34 führt.In particular, the degradation of the layer 34 can also lead to defects 28, such as cracks or separations in the boundary region between substrate 31 and layer 34, in which the gas can accumulate and weakens the material around the crack or flaw 28, so that the crack can continue to grow until the crack growth leads to flaking of the layer 34 in the boundary region between the substrate 31 and layer 34.

Figur 5 zeigt den Effekt der Diffusion eines Gases aus dem Elektrolyten in ein Bauteil 10.FIG. 5 shows the effect of the diffusion of a gas from the electrolyte into a component 10.

Der Oberflächenbereich 19, der entfernt werden soll, kann Teil eines Substrats 31 oder einer Schicht 34 sein.The surface area 19 to be removed may be part of a substrate 31 or a layer 34.

Das Gas, beispielsweise Wasserstoff, das sich in dem Elektrolyt 7 bildet und/oder bereits vorhanden ist oder zugeleitet wird, diffundiert in die metallischen Bereiche des Bauteils 10 ein und kann örtlich rekombinieren.
Insbesondere Vorsprünge 37, die durch Einkerbungen und Hinterschneidungen gebildet werden, bilden eine große Oberfläche mit dem Elektrolyten 7 oder der Umgebung und damit eine große Berührungsfläche für das Gas, bspw. Wasserstoff. Somit kann das Gas von allen Seiten in den Vorsprung 37 hineindiffundieren und der Vorsprung 37 ist sehr viel schneller mit Gas angereichert als andere Bereiche. Die Diffusion von Gas in das Bauteil 10 führt zu einer Lockerung des metallischen Gefüges im Bauteil 10 bis hin zur Rissbildung 22.The gas, for example hydrogen, which forms in the electrolyte 7 and / or already exists or is supplied, diffuses into the metallic regions of the component 10 and can locally recombine.
In particular, projections 37, which are formed by notches and undercuts, form a large surface area with the electrolyte 7 or the environment and thus a large contact area for the gas, for example hydrogen. Thus, the gas can diffuse into the protrusion 37 from all sides, and the protrusion 37 is gas enriched much faster than other regions. The diffusion of gas into the component 10 leads to a loosening of the metallic structure in the component 10 up to crack formation 22.

Die in Zusammenhang mit den Figuren 2, 3, 4 und 5 beschrieben Wechselwirkungsarten eines Gases mit dem Bauteil 10 können separat aber auch gleichzeitig stattfinden.The interaction modes of a gas with the component 10 described in connection with FIGS. 2, 3, 4 and 5 can take place separately but also simultaneously.

In einem Zwischenschritt oder einem letztem Schritt kann einmal oder mehrmals das Bauteil 10 mit dem Oberflächenbereich 19 herausgenommen werden und insbesondere durch Laser- oder Induktivheizung schnell erwärmt werden, so dass eine Diffusion des Gases aus dem Material des Bauteils 10 aufgrund der zeitlichen Kürze der Erwärmung nicht oder kaum stattfindet.
Durch die Erwärmung steigt ebenfalls der Gasdruck an, ohne dass eine weitere Gaszufuhr stattfinden muss. Der Effekt ist derselbe, nämlich dass Risse 22 im Oberflächenbereich 19 erzeugt werden.In an intermediate step or a last step, once or several times the component 10 with the surface region 19 can be taken out and in particular quickly heated by laser or inductive heating so that diffusion of the gas from the material of the component 10 does not occur due to the short time of heating or hardly takes place.
As a result of the heating, the gas pressure also increases without the need for further gas supply. The effect is the same, namely that cracks 22 are generated in the surface area 19.

Das Bauteil 10 kann zusätzlich, bspw. auch zur Erwärmung, einem Vakuum ausgesetzt werden, so dass der Druckunterschied zwischen Gasblase 25 und Bauteil 10 größer wird und das Verfahren beschleunigt wird.The component 10 can additionally, for example. For heating, exposed to a vacuum, so that the pressure difference between the gas bubble 25 and component 10 is greater and the process is accelerated.

Claims (15)

  1. Method for removing at least one surface region (19) of at least two components (10, 10'), wherein the at least two components (10, 10') are arranged in an electrolyte (7) and used as electrodes (13, 13'), wherein nitrogen is generated in an electrolyte (7) so that the at least one surface region (19) is removed by an interaction of nitrogen and the at least two components (10, 10') owing to the formation of at least one crack (22).
  2. Method according to Claim 1, characterized in that in addition to the two electrodes (13, 13') which are used for the electrolysis, at least one further component (10) is arranged in the electrolyte (7).
  3. Method according to Claim 1, characterized in that an aqueous solution is used for the electrolyte (7).
  4. Method according to Claim 1, characterized in that a non-aqueous solution or a melt is used for the electrolyte (7).
  5. Method according to Claim 1, 2, 3 or 4, characterized in that the electrolyte (7) consists of at least one nitrogen compound.
  6. Method according to Claim 1, characterized in that the component (10, 10') is operated as a cathode.
  7. Method according to Claim 1, characterized in that the component (10', 10) is operated as an anode.
  8. Method according to Claim 1, characterized in that the component (10, 10') comprises cavities (28), the cavities (28) being in particular cracks, notches or undercuts, gas being formed in the cavities (28) so that a crack (22) is formed inside the surface region (19) when there is a sufficiently high gas pressure of the gas, as a result of which parts of the surface region (19) are removed.
  9. Method according to Claim 1 or 8, characterized in that the surface region (19) is at least one part of a layer (34) of the component (10, 10').
  10. Method according to Claim 1, characterized in that the surface region (19) is at least partially corroded.
  11. Method according to Claim 1, characterized in that the gas diffuses into the surface region (19) and thus loosens the structure there.
  12. Method according to Claim 1, characterized in that the gas diffuses into the surface region (19) and recombines there.
  13. Method according to Claim 1, characterized in that the gas diffuses into at least one closed pore (37) and forms at least one gas bubble (25) there.
  14. Method according to Claim 8, characterized in that the component comprises a layer (34) and a substrate (31), and in that a gas bubble (25) is formed in a cavity (28) between the substrate (31) and the layer (34).
  15. Method according to Claim 1, characterized in that the component (10, 10') with the surface region (19) is heated in an intermediate method step or in a -last method step, the supply of heat increasing the gas pressure.
EP03788843A 2002-12-18 2003-12-03 Method for removing at least one surface area of at least two components Expired - Fee Related EP1573095B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2002159363 DE10259363A1 (en) 2002-12-18 2002-12-18 Method for removing at least one surface area of a component
DE10259363 2002-12-18
PCT/DE2003/003975 WO2004057066A1 (en) 2002-12-18 2003-12-03 Method for removing at least one surface area of at least two components

Publications (2)

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EP1573095A1 EP1573095A1 (en) 2005-09-14
EP1573095B1 true EP1573095B1 (en) 2006-10-25

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EP03788843A Expired - Fee Related EP1573095B1 (en) 2002-12-18 2003-12-03 Method for removing at least one surface area of at least two components
EP03788844A Ceased EP1573096A1 (en) 2002-12-18 2003-12-03 Method for removing at least one surface area of a component

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EP03788844A Ceased EP1573096A1 (en) 2002-12-18 2003-12-03 Method for removing at least one surface area of a component

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EP (2) EP1573095B1 (en)
DE (2) DE10259363A1 (en)
WO (2) WO2004057067A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1890004A1 (en) 2006-08-08 2008-02-20 Siemens Aktiengesellschaft Method for the production of a deposited layer from recycled layer material

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1917022A (en) * 1932-07-28 1933-07-04 Bullard Co Electrochemical process for cleaning metal
US2372599A (en) * 1940-03-29 1945-03-27 John S Nachtman Electrolytic cleaning and pickling of metal surfaces
DE1043008B (en) * 1955-07-01 1958-11-06 Othmar Ruthner Process and device for the electrolytic removal of steel sand residues from sandblasted surfaces from metal strips
DE3873038D1 (en) * 1987-12-01 1992-08-27 Bbc Brown Boveri & Cie METHOD FOR ELECTROLYTICALLY DETACHING A SURFACE PROTECTIVE LAYER HAVING A HIGH CR AND NI AND / OR CO CONTENT FROM THE BASE OF A COMPONENT COMPOSED FROM A SUPER ALLOY.
US4966664A (en) * 1988-04-13 1990-10-30 Siemens Aktiengesellschaft Method for removing photoresist
US5227036A (en) * 1990-02-23 1993-07-13 Gordon Roy G Electrolytic removal of tin oxide from a coater
DE10128507B4 (en) * 2001-06-14 2008-07-17 Mtu Aero Engines Gmbh Use of a device for the chemical or electrochemical machining of components

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Publication number Publication date
WO2004057067A1 (en) 2004-07-08
EP1573095A1 (en) 2005-09-14
EP1573096A1 (en) 2005-09-14
DE50305523D1 (en) 2006-12-07
DE10259363A1 (en) 2004-07-08
WO2004057066A1 (en) 2004-07-08

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