EP1573096A1 - Procede pour eliminer au moins une zone de surface d'un composant - Google Patents

Procede pour eliminer au moins une zone de surface d'un composant

Info

Publication number
EP1573096A1
EP1573096A1 EP03788844A EP03788844A EP1573096A1 EP 1573096 A1 EP1573096 A1 EP 1573096A1 EP 03788844 A EP03788844 A EP 03788844A EP 03788844 A EP03788844 A EP 03788844A EP 1573096 A1 EP1573096 A1 EP 1573096A1
Authority
EP
European Patent Office
Prior art keywords
gas
component
surface area
electrolyte
layer
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.)
Ceased
Application number
EP03788844A
Other languages
German (de)
English (en)
Inventor
Daniel Körtvelyessy
Ursus KRÜGER
Ursula Michelsen-Mohammadein
Ralph Reiche
Marc De Vogelaere
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.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1573096A1 publication Critical patent/EP1573096A1/fr
Ceased legal-status Critical Current

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 the inventive method 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 an exemplary device 1 with which the method according to the invention can be carried out.
  • An electrolyte 7 is arranged in a container 4, in which a component 10 (acts as an electrode) and an electrode 13 are arranged.
  • 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 potential of, for example, -1.086 volts.
  • the electrode 13 is then the anode.
  • the component 10 can also be the anode and the other electrode 13 the cathode.
  • the at least one component 10 does not necessarily have to be an electrode which is operated in the electrolytic circuit (FIG. 6). Two electrodes 13, 13 can be used for the electrolysis, the at least one component 10 being arranged only in the electrolyte 7. In both cases it is essential that the component 10 interacts with the gas that is formed 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).
  • 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 can be the same or different.
  • the electrolyte salt for the electrolysis nitrogen compounds, such as. B. ammonium nitrite used. Since both the cation and the anion contain nitrogen atoms in the electrolyte, electrolysis generates nitrogen gas at a suitably chosen pH value and potentials between the electrodes both at the cathode and at the anode. Since the components which have surface areas 19 to be removed are used simultaneously as anode and cathode, the efficiency of the method is increased. In addition, nitrogen as a gas is less dangerous than oxygen and hydrogen or their mixtures.
  • the component 10 is, for example, a nickel or cobalt-based superalloy, in particular for gas turbine parts, such as, for. B. turbine blades, with corroded areas on the surface.
  • Component 10 may also be a substrate 31 (FIG. 3) with an MCrAlY layer 34 (FIG. 3) that is oxidized or degraded. This layer then represents at least one surface area 19 to be removed. Due to its degradation, the surface areas 19 that are present multiple times, for example, have defects 28 such as undercuts, notches, cracks, microcracks,
  • Gas formation Some of the ion types contained in the electrolyte 7 discharge on the component 10 and thereby form a gas, for example hydrogen or oxygen, which forms gas bubbles 25 within the defects 28.
  • the gas hydrogen or oxygen forms, for example, from the water of the electrolyte 7.
  • 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 7, 10, as more and more gas is formed.
  • the gas pressure generates mechanical stresses in the surface area 19, which leads 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.
  • the degradation of layer 34 can also lead to defects 28, such as cracks or separations in the border area between substrate 31 and layer 34, in which the gas can accumulate and the material around the crack or defect 28 weakens, so that the crack can continue to grow until the crack growth leads to the chipping of layer 34 in the boundary region between substrate 31 and layer 34.
  • 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 gas is absorbed into the metal without further chemical reaction, whereby the embrittlement of the metal and a loosening of the structure occur.
  • Hydrogen is particularly suitable, since hydrogen ions diffuse smaller and better than other gas ions and can be absorbed in the structure in large numbers.
  • 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 a diffusion of the gas from the material of the component 10 due to the short time the warming does not or hardly takes place.
  • the heating also increases the gas pressure 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 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

La présente invention concerne un procédé pour éliminer des zones de surface d'un substrat. Dans l'état de la technique, les procédés électrolytiques utilisés pour éliminer des zones de surface demandent beaucoup de temps et s'avèrent coûteux. Le procédé de l'invention utilisé pour éliminer des zones de surface permet de produire dans la zone de surface (19) au moins une bulle de gaz (25) qui conduit à la formation d'une rupture (22) et ainsi à l'élimination des zones de surface (19).
EP03788844A 2002-12-18 2003-12-03 Procede pour eliminer au moins une zone de surface d'un composant Ceased EP1573096A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10259363 2002-12-18
DE2002159363 DE10259363A1 (de) 2002-12-18 2002-12-18 Verfahren zum Entfernen von zumindest einem Oberflächenbereich eines Bauteils
PCT/DE2003/003976 WO2004057067A1 (fr) 2002-12-18 2003-12-03 Procede pour eliminer au moins une zone de surface d'un composant

Publications (1)

Publication Number Publication Date
EP1573096A1 true EP1573096A1 (fr) 2005-09-14

Family

ID=32477772

Family Applications (2)

Application Number Title Priority Date Filing Date
EP03788843A Expired - Lifetime EP1573095B1 (fr) 2002-12-18 2003-12-03 Procede pour eliminer au moins une zone de surface d'au moins deux composants
EP03788844A Ceased EP1573096A1 (fr) 2002-12-18 2003-12-03 Procede pour eliminer au moins une zone de surface d'un composant

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP03788843A Expired - Lifetime EP1573095B1 (fr) 2002-12-18 2003-12-03 Procede pour eliminer au moins une zone de surface d'au moins deux composants

Country Status (3)

Country Link
EP (2) EP1573095B1 (fr)
DE (2) DE10259363A1 (fr)
WO (2) WO2004057067A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1890004A1 (fr) * 2006-08-08 2008-02-20 Siemens Aktiengesellschaft Procédé pour la production d'un revêtement à partir du matériau d'un revêtement recyclé

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 (de) * 1955-07-01 1958-11-06 Othmar Ruthner Verfahren und Vorrichtung zur elektrolytischen Entfernung von Stahlsandresten sandbestrahlter Oberflaechen von Metallbaendern
EP0318886B1 (fr) * 1987-12-01 1992-07-22 BBC Brown Boveri AG Procédé de décapage électrolytique d'une couche protectrice, ayant une haute teneur en chromium et nickel et/ou cobalt, recouvrant un substrat d'un objet fait en superalliage
JPH0212154A (ja) * 1988-04-13 1990-01-17 Siemens Ag 金属伝導層上のフオトレジスト層の除去方法
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

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2004057067A1 *

Also Published As

Publication number Publication date
DE50305523D1 (de) 2006-12-07
EP1573095A1 (fr) 2005-09-14
WO2004057066A1 (fr) 2004-07-08
WO2004057067A1 (fr) 2004-07-08
EP1573095B1 (fr) 2006-10-25
DE10259363A1 (de) 2004-07-08

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