EP1706522B1 - Procede d'elimination electrochimique de revetements presents sur des pieces - Google Patents

Procede d'elimination electrochimique de revetements presents sur des pieces Download PDF

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Publication number
EP1706522B1
EP1706522B1 EP04816277.0A EP04816277A EP1706522B1 EP 1706522 B1 EP1706522 B1 EP 1706522B1 EP 04816277 A EP04816277 A EP 04816277A EP 1706522 B1 EP1706522 B1 EP 1706522B1
Authority
EP
European Patent Office
Prior art keywords
removal
potential
layer
polarization
layers
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.)
Not-in-force
Application number
EP04816277.0A
Other languages
German (de)
English (en)
Other versions
EP1706522A1 (fr
Inventor
Friedrich-Wilhelm Bach
Thomas Bautsch
Alexander GÜNTHER
Jürgen OLFE
Phan-Tan Tai
Peter Wilk
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.)
MTU Aero Engines AG
Original Assignee
MTU Aero Engines GmbH
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 MTU Aero Engines GmbH filed Critical MTU Aero Engines GmbH
Publication of EP1706522A1 publication Critical patent/EP1706522A1/fr
Application granted granted Critical
Publication of EP1706522B1 publication Critical patent/EP1706522B1/fr
Not-in-force legal-status Critical Current
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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
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/02—Etching
    • C25F3/14—Etching locally

Definitions

  • the invention relates to a method for the electrochemical stripping of components according to the preamble of patent claim 1.
  • Components of a gas turbine such as the blades, are provided with special coatings to provide oxidation resistance, corrosion resistance, or even erosion resistance at the surfaces.
  • the components of gas turbines are subject to wear during operation of the same and can be damaged in any other way. To repair damage, it is usually necessary to remove or remove the coating partially, or even in total from the component to be repaired. The removal or removal of coatings is also referred to as stripping.
  • the electrochemical stripping is based on the principle of electrolysis. Electrochemical decoating methods distinguish between those which work with the aid of a 2-electrode system, a 3-electrode system or even a 4-electrode system.
  • the present invention relates to an electrochemical stripping process, preferably using a 2-electrode system.
  • the US 6,165,345 discloses an electrochemical stripping method for gas turbine blades based on a 2-electrode system. According to the method disclosed therein, a turbine blade to be stripped is connected to the positive terminal of a voltage source, to the negative terminal of which a specially adapted electrode is connected.
  • the shape of this electrode essentially corresponds to the shape of the turbine blade to be stripped or the shape of the region of the turbine blade to be stripped.
  • the electrode and at least the area of the turbine blade to be stripped are immersed in a working medium, with a DC voltage of 1 to 3 V per component being applied to provide a current flow of between 5 and 10 A.
  • the one created by the DC voltage defined working range of the electrochemical stripping is according to US 6,165,345 constant during the entire stripping process.
  • the present invention is based on the problem of providing a novel process for the electrochemical stripping of components.
  • an operating point of the electrochemical stripping is determined prior to the actual electrochemical stripping under real process conditions and continuously redetermined or monitored and, if necessary, adjusted during the electrochemical stripping process.
  • the operating point of the electrochemical stripping in situ - that is, under real process conditions of electrochemical stripping - determined and constantly monitored during the electrochemical stripping and optionally adjusted. This makes it possible to adapt the operating point to changing process conditions and thus always to work with an optimal stripping speed or removal rate. The time required for stripping is thereby markedly reduced. Due to the continuous monitoring and, if appropriate, adaptation of the operating point during the electrochemical stripping, the operating point is also adapted with regard to the component to be stripped, in particular to the degree of stripping already undertaken and the associated change in the chemical composition thereof. Accordingly, the method according to the invention is distinguished by a high selectivity in stripping, which results in a low risk of damage to the components during stripping.
  • a DC potential is applied, wherein the DC potential is increased until a measured polarization current reaches a maximum as a function of the DC potential, this maximum determines the operating point of the stripping.
  • the DC potential becomes an AC voltage superimposed and it is measured as a result of the AC superimposing change in the polarization current or polarization conductance, wherein, depending on the DC voltage potential is adjusted so that the polarization current remains in the maximum.
  • FIG. 1 shows such a blade 10 of a gas turbine, which comprises an airfoil 11 and a blade root 12.
  • the entire blade 10 that is to say the entire surface of the blade 11 and the blade 12, is provided with a coating 13.
  • This coating 13 may be an oxidation resistant, corrosion resistant and erosion resistant coating.
  • a method for example for repairing the blade 10, to remove or remove the coating 13 from the surface of the blade 11 and the blade root 12.
  • this is carried out by electrochemical means using a 2-electrode system.
  • the same is connected to the positive terminal of a voltage source, whereas the control electrode or counter electrode is connected to the negative terminal of the voltage source.
  • the control electrode or counterelectrode and the blade 10 to be stripped are immersed in a working medium - in an electrolyte solution.
  • a robust metal electrode is used as the control electrode.
  • Such a robust metal electrode as a control electrode is much less sensitive to the stripping process and to environmental influences, such as electromagnetic waves. As a result, the electrochemical decoating method as a whole becomes less prone to failure and thus more robust.
  • the DC voltage is then increased until the first derivative of the polarization current, as a function of the DC potential, assumes the value zero starting from positive values and then becomes negative, which means that the polarization current has reached a maximum and the polarization conductance assumes the value zero.
  • This value of the DC potential at which the polarization current assumes a maximum or the polarization conductance assumes the value zero, serves as an operating point for the electrochemical stripping.
  • the electrochemical stripping proceeds at a maximum removal rate or stripping rate. This determination of the operating point is system-specific, ie that the ohmic resistance of the working medium, ie the electrolyte solution, is taken into account.
  • an alternating voltage is superimposed on the thus determined direct voltage potential during the electrochemical stripping.
  • the alternating voltage preferably has a low voltage amplitude of preferably ⁇ 5 mV.
  • the change in the polarization current or the polarization conductance that occurs as a result of the alternating voltage superposition is measured, and depending on this, the direct voltage potential is changed so that the polarization current remains at its maximum or the polarization conductance remains at zero. If the polarization conductance is negative, the control potential or the DC potential is reduced; if the polarization conductance is positive, it is correspondingly increased. This ensures that the stripping always takes place with the maximum possible removal rate and stripping in the region of the so-called breakdown potential is avoided. In this way, an optimal removal rate and an always gentle removal of the gas turbine blade to be stripped can take place during the entire stripping process.
  • the measured values of the polarization current also contain information about the degree of delamination already taking place of the component to be stripped or on the structure of the coating to be removed with the aid of electrochemical stripping.
  • the termination criterion for the electrochemical stripping becomes a relation between the initial value and the current one obtained measured values of the polarization current. This calculation is carried out continuously during the stripping and thus continuously. If the polarization current assumes a value obtained from this calculation, then the de-coating process can be interrupted as a function of this.
  • the method according to the invention for electrochemical stripping is preferably used for the stripping of gas turbine blades. It is also suitable for the stripping of such gas turbine blades having channels inside, such as cooling channels.
  • the operating point of the electrochemical stripping is determined and continuously monitored during the stripping and adjusted if necessary. In this way, the stripping of the blade surfaces takes place. If, on the basis of the continuously detected values of the polarization current, it is ascertained that the stripping process on the surface of the gas turbine blade is broken off, the control potential is increased according to the invention to a region which is passive for the blade surface.
  • the control potential is shifted into an active region for the channels, so that delamination can also be carried out within the channels in this way. During stripping of the blade surfaces there is no delamination of the channels.
  • the present inventive method for electrochemical stripping of components is characterized by a high selectivity of the stripping process.
  • the working point of the electrochemical stripping is continuously adapted and thus the electrochemical stripping can always be carried out with optimum removal rate.
  • the process according to the invention is faster and less expensive than the stripping processes known from the prior art. Due to the high selectivity, there is a minimized risk of damage to the components during stripping.
  • the electrochemical stripping process according to the invention strongly diluted acids are used as electrolyte solution or working medium. In this respect, only small protective measures and a low effort in disposal of the working medium required.
  • the stripping process according to the invention can be integrated into a line production.
  • the erfindunstrae method is further insensitive to so-called local elements on the surface of the component to be stripped, which can form due to a very different wear or damage to the coating on the surface of the component to be stripped.
  • control potential or the DC potential should not be picked up directly on the current-carrying lines, but rather via a separate line. In this way, voltage losses of the current-carrying lines can be eliminated.
  • the operating point can be more accurately determined and set.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Claims (8)

  1. Procédé d'élimination électrochimique de revêtements présents sur des pièces, en particulier d'élimination électrochimique de revêtements d'aluminium présents sur des pièces d'une turbine à gaz, un point de fonctionnement de l'élimination électrochimique des revêtements étant déterminé dans les conditions de procédé réelles avant l'élimination électrochimique proprement dite, caractérisé en ce que le point de fonctionnement présentant l'élimination de revêtements maximale est déterminé sous forme de fonction d'un courant de polarisation mesuré ou d'une conductivité de polarisation mesurée et est déterminé de nouveau constamment pendant l'élimination électrochimique des revêtements et le potentiel de courant continu associé est adapté de manière correspondante.
  2. Procédé selon la revendication 1, caractérisé en ce que l'élimination des revêtements est réalisée en utilisant un système à 2 électrodes.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'un potentiel de courant continu est appliqué, le potentiel de courant continu étant augmenté jusqu'à ce que la conductivité de polarisation ou la première dérivation du courant de polarisation en tant que fonction du potentiel de courant continu soit presque nulle, et en ce que cette valeur du potentiel de courant continu détermine le point de fonctionnement de l'élimination des revêtements.
  4. Procédé selon l'une ou plusieurs des revendications 1 à 3, caractérisé en ce que, pour l'élimination des revêtements, on applique un potentiel de courant continu, le potentiel de courant continu étant élevé jusqu'à ce que le courant de polarisation atteigne un maximum en tant que fonction du potentiel de courant continu et en ce que ce maximum détermine le point de fonctionnement de l'élimination des revêtements.
  5. Procédé selon l'une ou plusieurs des revendications 1 à 4, caractérisé en ce que, pendant l'élimination des revêtements, un courant alternatif est superposé au potentiel de courant continu, en ce qu'une modification du courant de polarisation ou de la conductivité de polarisation s'instaurant à la suite de la superposition du courant alternatif est mesurée, et en ce que, en fonction de cela, le potentiel de courant continu est ajusté de sorte que le courant de polarisation reste au maximum.
  6. Procédé selon la revendication 5, caractérisé en ce qu'un courant alternatif de faible amplitude, d'en particulier ± 5 mV, est superposé au potentiel de courant continu.
  7. Procédé selon l'une ou plusieurs des revendications 1 à 6, caractérisé en ce que les valeurs du courant de polarisation ou de la conductivité de polarisation, mesurées pendant l'élimination des revêtements, sont utilisées pour déterminer un critère d'effondrement pour l'élimination électrochimique des revêtements.
  8. Procédé selon l'une ou plusieurs des revendications 1 à 7, caractérisé en ce que l'on élimine les revêtements d'une pale d'une turbine à gaz avec des canaux intégrés à la pale, en particulier des canaux de refroidissement, le moment de fonctionnement étant déterminé en tant que fonction d'un courant de polarisation mesuré ou de conductivité de polarisation pour l'élimination des revêtements de la surface de la pale et le potentiel imposé étant augmenté après l'élimination des revêtements de la surface de la pale pour que l'élimination des revêtements de la surface de la pale s'éteigne et qu'une élimination des revêtements des canaux se fasse.
EP04816277.0A 2004-01-20 2004-12-22 Procede d'elimination electrochimique de revetements presents sur des pieces Not-in-force EP1706522B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004002763A DE102004002763A1 (de) 2004-01-20 2004-01-20 Verfahren zum elektrochemischen Entschichten von Bauteilen
PCT/DE2004/002799 WO2005068689A1 (fr) 2004-01-20 2004-12-22 Procede d'elimination electrochimique de revetements presents sur des pieces

Publications (2)

Publication Number Publication Date
EP1706522A1 EP1706522A1 (fr) 2006-10-04
EP1706522B1 true EP1706522B1 (fr) 2013-04-24

Family

ID=34716687

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04816277.0A Not-in-force EP1706522B1 (fr) 2004-01-20 2004-12-22 Procede d'elimination electrochimique de revetements presents sur des pieces

Country Status (5)

Country Link
US (1) US20080283416A1 (fr)
EP (1) EP1706522B1 (fr)
JP (1) JP4727592B2 (fr)
DE (1) DE102004002763A1 (fr)
WO (1) WO2005068689A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080202552A1 (en) * 2006-12-07 2008-08-28 Lawrence Bernard Kool Method for selectively removing coatings from metal substrates
DE102010046372A1 (de) 2010-09-24 2012-03-29 Oerlikon Trading Ag, Trübbach Verfahren zum Entschichten von Werkstücken
CN103088398B (zh) * 2011-10-31 2016-05-11 通用电气公司 多通道电化学去金属涂层系统及其控制电路
DE102017213168A1 (de) 2017-07-31 2019-01-31 Carl Zeiss Smt Gmbh Verfahren zum Behandeln eines reflektiven optischen Elements für den EUV-Wellenlängenbereich, Verfahren zu dessen Herstellung sowie Vorrichtung zur Behandlung
DE102017220726A1 (de) 2017-11-20 2018-12-13 Carl Zeiss Smt Gmbh Verfahren zum Betreiben eines reflektiven optischen Elements

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU186150B (en) * 1982-10-29 1985-06-28 Latszereszeti Eszkoezoek Gyara Process for the removal electrolitically of nickel, chrome ot gold layers from the surface of copper or cupric alloys and equipemnt for carrying out the process
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.
DE19840471A1 (de) * 1998-09-04 2000-03-09 Schmid Gmbh & Co Geb Einrichtung zum Abtrag einer Beschichtung von Gegenständen
US6176999B1 (en) * 1998-12-18 2001-01-23 United Technologies Corporation Feedback controlled stripping of airfoils
US6428683B1 (en) * 2000-12-15 2002-08-06 United Technologies Corporation Feedback controlled airfoil stripping system with integrated water management and acid recycling system
US6599416B2 (en) * 2001-09-28 2003-07-29 General Electric Company Method and apparatus for selectively removing coatings from substrates
TWI231831B (en) * 2001-10-11 2005-05-01 Shipley Co Llc Stripping solution
US7033466B2 (en) * 2002-09-27 2006-04-25 United Technologies Corporation Electrochemical stripping using single loop control
EP1473387A1 (fr) * 2003-05-02 2004-11-03 Siemens Aktiengesellschaft Procédé de décapage d'une couche d'une pièce

Also Published As

Publication number Publication date
DE102004002763A1 (de) 2005-08-04
JP4727592B2 (ja) 2011-07-20
US20080283416A1 (en) 2008-11-20
EP1706522A1 (fr) 2006-10-04
WO2005068689A1 (fr) 2005-07-28
JP2007518882A (ja) 2007-07-12

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