EP1573095A1 - Verfahren zum entfernen von zumindest einem oberflächenbereich zumindest zweier bauteile - Google Patents
Verfahren zum entfernen von zumindest einem oberflächenbereich zumindest zweier bauteileInfo
- Publication number
- EP1573095A1 EP1573095A1 EP03788843A EP03788843A EP1573095A1 EP 1573095 A1 EP1573095 A1 EP 1573095A1 EP 03788843 A EP03788843 A EP 03788843A EP 03788843 A EP03788843 A EP 03788843A EP 1573095 A1 EP1573095 A1 EP 1573095A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- component
- surface area
- electrolyte
- components
- 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
Classifications
-
- 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 area of a component according to claim 1.
- US 2001/0054447 A1 discloses a method for electrolytic deposition, in which pulsed currents with reverse pulses are used to reduce the formation of hydrogen.
- Surface areas of a component (substrate, layer) or partial areas of a component that are a layer that are, for example, corroded and that are to be removed can be removed in various ways.
- Figures 1, 6 and 7 each have a device with which an electrolytic process can be carried out
- FIG. 2 shows a gas bubble in a defect in a surface area
- Figure 4 shows a defect between a layer and a
- FIG. 1 shows a device 1 with which an electrolytic process can be carried out.
- An electrolyte 7 is arranged in a container 4, in which there is in turn a component 10 (acts as an electrode)
- the component 10 and the electrode 13 are connected to one another in an electrically conductive manner with a current / voltage source 16.
- the component 10 forms, for example, the cathode with a negative one
- the electrode 13 is then the anode.
- the component 10 can also the anode and the electrode 13
- 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.
- Two electrodes 13, 13 ⁇ can also be used for the electrolysis, the at least one component 10 being 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 can also be a non-aqueous solution or melt (for example salt melt).
- two components 10, 10 'in which a surface area is to be removed represent the two electrodes necessary for the electrolysis (FIG. 7).
- a chemical reaction takes place at both electrodes 13, 13 '(components 10, 10'), ie an oxidation on one and a reduction on the other.
- gas can form, which according to the invention (FIGS. 2, 3, 4, 5) interacts with component 10, 10'.
- the gas that forms on the two electrodes 10, 10 ⁇ (components) can be the same or different.
- the electrolyte salt for electrolysis nitrogen compounds are preferably used here, such as, for. B.
- nitrogen as a gas is less dangerous than oxygen and hydrogen or their mixtures.
- the component 10, lü 'is for example, a nickel or cobalt-based superalloy, in particular for
- Gas turbine parts such as B. turbine blades, with corroded areas on the surface.
- This layer 34 then represents at least one surface area 19 to be removed.
- the surface areas for example, which are present multiple times
- the components 10, 10' form a gas in the defects 28.
- Nitrogen can also form from a non-aqueous electrolyte 7, for example.
- 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 being formed.
- the gas pressure generates mechanical stresses in the surface area 19, which lead to the formation of cracks 22 in the surface area 19. This cracking causes parts of the surface area 19 to flake off and the surface area 19 to be removed.
- FIG. 3 shows the diffusion of the gas that forms, for example, in the electrolyte 7 into the component 10.
- a gas for example hydrogen, forms 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.
- a gas bubble 25 likewise forms in the pore 37, the pressure of which increases continuously until it leads to the formation of cracks 22.
- FIG. 4 shows surface areas 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, e.g. an MCrAlY and / or a ceramic layer.
- FIG. 5 shows the effect of diffusion of a gas from the electrolyte into a component 10.
- the surface area 19 that is to be removed can be part of a substrate 31 or a layer 34.
- the gas for example hydrogen, which forms in the electrolyte 7 and / or is already present or is supplied, diffuses into the metallic areas of the component 10 and can recombine locally.
- projections 37 which are formed by indentations and undercuts, form a large surface with the electrolyte 7 or the surroundings and thus a large contact area for the gas, for example hydrogen.
- the gas can thus diffuse into the projection 37 from all sides and the projection 37 is enriched with gas much more quickly than other areas.
- the diffusion of gas into the component 10 leads to a loosening of the metallic structure in the component 10 up to the formation of cracks 22.
- the component 10 with the surface area 19 can be removed one or more times and can be quickly heated in particular by laser or inductive heating 20, so that diffusion of the gas from the material of the component 10 is not possible due to the short duration of the heating hardly takes place.
- the component 10 can additionally, for example also for heating, be exposed to a vacuum, so that the pressure difference between the gas bubble 25 and the component 10 increases and the process is accelerated.
Landscapes
- 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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002159363 DE10259363A1 (de) | 2002-12-18 | 2002-12-18 | Verfahren zum Entfernen von zumindest einem Oberflächenbereich eines Bauteils |
DE10259363 | 2002-12-18 | ||
PCT/DE2003/003975 WO2004057066A1 (de) | 2002-12-18 | 2003-12-03 | Verfahren zum entfernen von zumindest einem oberflächenbereich zumindest zweier bauteile |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1573095A1 true EP1573095A1 (de) | 2005-09-14 |
EP1573095B1 EP1573095B1 (de) | 2006-10-25 |
Family
ID=32477772
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03788843A Expired - Lifetime EP1573095B1 (de) | 2002-12-18 | 2003-12-03 | Verfahren zum entfernen von zumindest einem oberflächenbereich zumindest zweier bauteile |
EP03788844A Ceased EP1573096A1 (de) | 2002-12-18 | 2003-12-03 | Verfahren zum entfernen von zumindest einem oberflächenbereich eines bauteils |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03788844A Ceased EP1573096A1 (de) | 2002-12-18 | 2003-12-03 | Verfahren zum entfernen von zumindest einem oberflächenbereich eines bauteils |
Country Status (3)
Country | Link |
---|---|
EP (2) | EP1573095B1 (de) |
DE (2) | DE10259363A1 (de) |
WO (2) | WO2004057066A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1890004A1 (de) | 2006-08-08 | 2008-02-20 | Siemens Aktiengesellschaft | Verfahren zum Herstellen einer Nutzschicht aus wiederverwendetem Schichtmaterial |
Family Cites Families (7)
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 (de) * | 1955-07-01 | 1958-11-06 | Othmar Ruthner | Verfahren und Vorrichtung zur elektrolytischen Entfernung von Stahlsandresten sandbestrahlter Oberflaechen von Metallbaendern |
DE3873038D1 (de) * | 1987-12-01 | 1992-08-27 | Bbc Brown Boveri & Cie | Verfahren zum elektrolytischen abloesen einer einen hohen cr- und ni- und/oder co-gehalt aufweisenden oberflaechenschutzschicht vom grundkoerper eines aus einer superlegierung bestehenden bauteils. |
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 (de) * | 2001-06-14 | 2008-07-17 | Mtu Aero Engines Gmbh | Verwendung einer Vorrichtung zum chemischen oder elektrochemischen Bearbeiten von Bauteilen |
-
2002
- 2002-12-18 DE DE2002159363 patent/DE10259363A1/de not_active Withdrawn
-
2003
- 2003-12-03 EP EP03788843A patent/EP1573095B1/de not_active Expired - Lifetime
- 2003-12-03 DE DE50305523T patent/DE50305523D1/de not_active Expired - Fee Related
- 2003-12-03 EP EP03788844A patent/EP1573096A1/de not_active Ceased
- 2003-12-03 WO PCT/DE2003/003975 patent/WO2004057066A1/de not_active Application Discontinuation
- 2003-12-03 WO PCT/DE2003/003976 patent/WO2004057067A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2004057066A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2004057067A1 (de) | 2004-07-08 |
EP1573096A1 (de) | 2005-09-14 |
WO2004057066A1 (de) | 2004-07-08 |
DE50305523D1 (de) | 2006-12-07 |
EP1573095B1 (de) | 2006-10-25 |
DE10259363A1 (de) | 2004-07-08 |
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Inventor name: REICHE, RALPH Inventor name: DE VOGELAERE, MARC Inventor name: MICHELSEN-MOHAMMADEIN, URSULA Inventor name: KRUEGER, URSUS Inventor name: KOERTVELYESSY, DANIEL |
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