EP1632589B1 - Method for removing surface areas of a component - Google Patents

Method for removing surface areas of a component Download PDF

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Publication number
EP1632589B1
EP1632589B1 EP05024433A EP05024433A EP1632589B1 EP 1632589 B1 EP1632589 B1 EP 1632589B1 EP 05024433 A EP05024433 A EP 05024433A EP 05024433 A EP05024433 A EP 05024433A EP 1632589 B1 EP1632589 B1 EP 1632589B1
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EP
European Patent Office
Prior art keywords
current
process according
component
pulse
block
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.)
Expired - Fee Related
Application number
EP05024433A
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German (de)
French (fr)
Other versions
EP1632589A3 (en
EP1632589A2 (en
Inventor
Marc De Vogelaere
Daniel Körtvelyessy
Ralph Reiche
Jan Dr. Steinbach
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Siemens AG
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Siemens AG
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Filing date
Publication date
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Publication of EP1632589A2 publication Critical patent/EP1632589A2/en
Publication of EP1632589A3 publication Critical patent/EP1632589A3/en
Application granted granted Critical
Publication of EP1632589B1 publication Critical patent/EP1632589B1/en
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Expired - Fee Related 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
    • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
    • 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

Definitions

  • the invention relates to a method for removing surface areas of a component according to claim 1.
  • components coated with coatings of the type MCrAlY or ZrO 2 for example, by acid stripping in combination with sand blasting or by high-pressure water jets stripped.
  • DE-B 1 043 008 relates to a method for removing steel sand residues of sandblasted surfaces of metal strips and an apparatus for carrying out this method.
  • the EP 1 122 323 A1 and the US 5,944,909 show examples of the chemical removal of surface areas.
  • the EP 1 941 34 A1 , the EP 1 010 782 A1 as well as the U.S. Patent 6,165,345 disclose methods for the electrochemical removal of metallic coatings (stripping).
  • the object of the invention is therefore to provide a method in which the stripping runs faster and cheaper.
  • the object is achieved by a method for removing surface areas of a component according to claim 1.
  • the FIG. 1 shows a device 1.
  • the device 1 consists of a container 4, in which an electrolyte 7 is arranged.
  • an electrode 10 and a component 13 is arranged in the electrolyte 7, an electrode 10 and a component 13 is arranged.
  • the electrode 10 and the component 13 are electrically connected to a current / voltage pulse generator 16, which generates current pulses and a base current.
  • the component 13 is, for example, a coated turbine blade, which has as a substrate a nickel- or cobalt-based superalloy on which a metallic layer is applied, which serves, for example, as a corrosion protection or anchoring layer.
  • Such a layer has, in particular, the composition MCrAlY, where M represents an element iron, cobalt or nickel.
  • the coating is corroded during use of the turbine blade 13.
  • the resulting surface area 25 (indicated by dashed lines) is to be removed by the method according to the invention and the device 1.
  • the current pulse generator 16 generates a pulsed current / voltage signal and a base current ( FIG. 2 ).
  • an ultrasonic probe 19 is arranged, which is operated by an ultrasonic source 22.
  • the ultrasonic excitation improves the hydrodynamics of the process and thereby supports the electrochemical reaction.
  • FIG. 2 shows an exemplary current / voltage curve of the current / voltage pulse generator 16.
  • the current pulse signal or the voltage pulse is, for example, rectangular (pulse shape) and has a pulse duration t on . Between the individual impulses there is a break of the length t off . Furthermore, the current pulse signal is determined by its current level I max . The current flowing between the electrode 10 and the device 13 (I max ), the pulse duration (t on ) and the pulse pause (t off ) have a significant influence on the electrochemical reaction by accelerating it.
  • FIG. 3 shows an exemplary string of current pulses 40 that repeat themselves.
  • a sequence 34 consists of at least two blocks 77.
  • Each block 77 consists of at least one current pulse 40.
  • a current pulse 40 is characterized by its duration t on , the height I max and its pulse shape (rectangle, triangle, ). Equally important as process parameters are the pauses between the individual current pulses 40 (t off ) and the pauses between the blocks 77.
  • the sequence 34 consists, for example, of a first block 77 with three current pulses 40, between which in turn takes a break. This is followed by a second block 77, which has a greater current level and consists of six current pulses 40. After another pause, four current pulses 40 follow in the reverse direction, i. with changed polarity.
  • sequence 34 is followed by another block 77 with four current pulses.
  • the sequence 34 can be repeated several times.
  • the individual pulse times t on are preferably of the order of magnitude of about 1 to 10 milliseconds.
  • the duration of the block 77 is on the order of up to 10 seconds, so that up to 500 pulses are emitted in a block 77.
  • a block 77 is matched with its parameters to a constituent of an alloy, which is to be stripped, for example, in order to achieve the best removal of this constituent. These can be determined in individual experiments.

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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)
  • Electroplating Methods And Accessories (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Entfernung von Oberflächenbereichen eines Bauteils gemäß Anspruch 1.The invention relates to a method for removing surface areas of a component according to claim 1.

Bislang werden Bauteile, die mit Beschichtungen des Typs MCrAlY oder ZrO2 beschichtet sind, beispielsweise durch Säurestrippen in Kombination mit Sandstrahlen oder durch Hochdruckwasserstrahlen entschichtet.So far, components coated with coatings of the type MCrAlY or ZrO 2 , for example, by acid stripping in combination with sand blasting or by high-pressure water jets stripped.

DE-B 1 043 008 betrifft ein Verfahren zur Entfernung von Stahlsandresten sandbestrahlter Oberflächen von Metallbändern und eine Vorrichtung zur Durchführung dieses Verfahrens. DE-B 1 043 008 relates to a method for removing steel sand residues of sandblasted surfaces of metal strips and an apparatus for carrying out this method.

Die EP 1 122 323 A1 und die US 5,944,909 zeigen Beispiele für das chemische Entfernen von Oberflächenbereichen.The EP 1 122 323 A1 and the US 5,944,909 show examples of the chemical removal of surface areas.

Die EP 1 941 34 A1 , die EP 1 010 782 A1 sowie die US-PS 6,165,345 offenbaren Methoden zum elektrochemischen Entfernen von metallischen Beschichtungen (Strippen).The EP 1 941 34 A1 , the EP 1 010 782 A1 as well as the U.S. Patent 6,165,345 disclose methods for the electrochemical removal of metallic coatings (stripping).

Die oben aufgelisteten Verfahren sind zeit- und damit kostenintensiv.The above-listed methods are time-consuming and thus cost-intensive.

Aufgabe der Erfindung ist es daher, ein Verfahren aufzuzeigen, bei denen die Entschichtung schneller und preiswerter abläuft.The object of the invention is therefore to provide a method in which the stripping runs faster and cheaper.

Die Aufgabe wird durch ein Verfahren zur Entfernung von Oberflächenbereichen eines Bauteils gemäß Anspruch 1 gelöst.The object is achieved by a method for removing surface areas of a component according to claim 1.

Weitere vorteilhafte Ausgestaltungen und Verfahrensschritte sind in den jeweiligen Unteransprüchen aufgelistet.Further advantageous embodiments and method steps are listed in the respective subclaims.

Es zeigen

Figur 1
eine Vorrichtung,
Figur 2
einen zeitlichen Verlauf eines Stromes eines Strompulsgebers und
Figur 3
einen weiteren zeitlichen Verlauf eines Stromes eines Strompulsgebers.
Show it
FIG. 1
a device
FIG. 2
a time course of a current of a current pulse generator and
FIG. 3
a further time course of a current of a current pulse generator.

Die Figur 1 zeigt eine Vorrichtung 1.
Die Vorrichtung 1 besteht aus einem Behälter 4, in dem ein Elektrolyt 7 angeordnet ist.
In dem Elektrolyt 7 ist eine Elektrode 10 und ein Bauteil 13 angeordnet. Die Elektrode 10 und das Bauteil 13 sind elektrisch mit einem Strom/Spannungspulsgeber 16 verbunden, der Strompulse und einen Basisstrom erzeugt.
Das Bauteil 13 ist beispielsweise eine beschichtete Turbinenschaufel, die als Substrat eine Nickel- oder Kobalt-basierte Superlegierung aufweist, auf der eine metallische Schicht aufgebracht ist, die beispielsweise als Korrosionsschutz- oder Verankerungsschicht dient. Eine solche Schicht weist insbesondere die Zusammensetzung MCrAlY, wobei M für ein Element Eisen, Kobalt oder Nickel steht, auf.The FIG. 1 shows a device 1.
The device 1 consists of a container 4, in which an electrolyte 7 is arranged.
In the electrolyte 7, an electrode 10 and a component 13 is arranged. The electrode 10 and the component 13 are electrically connected to a current / voltage pulse generator 16, which generates current pulses and a base current.
The component 13 is, for example, a coated turbine blade, which has as a substrate a nickel- or cobalt-based superalloy on which a metallic layer is applied, which serves, for example, as a corrosion protection or anchoring layer. Such a layer has, in particular, the composition MCrAlY, where M represents an element iron, cobalt or nickel.

Die Beschichtung ist während des Einsatzes der Turbinenschaufel 13 korrodiert. Der so entstandene Oberflächenbereich 25 (gestrichelt angedeutet) soll durch das erfindungsgemäße Verfahren und die Vorrichtung 1 entfernt werden. Ebenso können von einem Bauteil 13, das keine Beschichtung aufweist, aber im oberflächennahen Bereich durch Korrosion, Oxidation oder sonstige Arten der Degradation entstandene Schichtbereiche 25 entfernt werden.
Der Strompulsgeber 16 erzeugt ein gepulstes Strom/Spannungssignal und einen Basisstrom (Figur 2) .The coating is corroded during use of the turbine blade 13. The resulting surface area 25 (indicated by dashed lines) is to be removed by the method according to the invention and the device 1. Likewise, it is possible to remove from a component 13, which has no coating, but layer regions 25 formed in the near-surface region as a result of corrosion, oxidation or other types of degradation.
The current pulse generator 16 generates a pulsed current / voltage signal and a base current ( FIG. 2 ).

Optional ist in dem Elektrolyt 7 eine Ultraschallsonde 19 angeordnet, die durch eine Ultraschallquelle 22 betrieben wird.Optionally, in the electrolyte 7, an ultrasonic probe 19 is arranged, which is operated by an ultrasonic source 22.

Die Ultraschallanregung verbessert die Hydrodynamik des Prozesses und unterstützt dadurch die elektrochemische Reaktion.The ultrasonic excitation improves the hydrodynamics of the process and thereby supports the electrochemical reaction.

Figur 2 zeigt einen beispielhaften Strom/Spannungsverlauf des Strom/Spannungspulsgebers 16. FIG. 2 shows an exemplary current / voltage curve of the current / voltage pulse generator 16.

Das Strompulssignal oder der Spannungspuls ist beispielsweise rechteckig (Pulsform) und hat eine Pulsdauer ton. Zwischen den einzelnen Impulsen besteht eine Pause der Länge toff. Weiterhin wird das Strompulssignal durch seine Stromhöhe Imax bestimmt.
Der Strom, der zwischen der Elektrode 10 und dem Bauteil 13 fließt (Imax), die Pulsdauer (ton) und die Pulspause (toff) haben einen wesentlichen Einfluss auf die elektrochemische Reaktion, indem diese beschleunigt wird.The current pulse signal or the voltage pulse is, for example, rectangular (pulse shape) and has a pulse duration t on . Between the individual impulses there is a break of the length t off . Furthermore, the current pulse signal is determined by its current level I max .
The current flowing between the electrode 10 and the device 13 (I max ), the pulse duration (t on ) and the pulse pause (t off ) have a significant influence on the electrochemical reaction by accelerating it.

Figur 3 zeigt eine beispielhafte Aneinanderreihung von Strompulsen 40, die sich wiederholen.
Eine Sequenz 34 besteht aus zumindest zwei Blöcken 77. Jeder Block 77 besteht aus zumindest einem Strompuls 40.
Ein Strompuls 40 ist charakterisiert durch seine Dauer ton, die Höhe Imax und seine Pulsform (Rechteck, Dreieck, ...). Ebenso wichtig als Prozessparameter sind die Pausen zwischen den einzelnen Strompulsen 40 (toff) und die Pausen zwischen den Blöcken 77. FIG. 3 shows an exemplary string of current pulses 40 that repeat themselves.
A sequence 34 consists of at least two blocks 77. Each block 77 consists of at least one current pulse 40.
A current pulse 40 is characterized by its duration t on , the height I max and its pulse shape (rectangle, triangle, ...). Equally important as process parameters are the pauses between the individual current pulses 40 (t off ) and the pauses between the blocks 77.

Die Sequenz 34 besteht bspw. aus einem ersten Block 77 mit drei Strompulsen 40, zwischen denen wiederum eine Pause stattfindet. Darauf folgt ein zweiter Block 77, der eine größere Stromhöhe aufweist und aus sechs Strompulsen 40 besteht. Nach einer weiteren Pause folgen vier Strompulse 40 in umgekehrter Richtung, d.h. mit geänderter Polarität.The sequence 34 consists, for example, of a first block 77 with three current pulses 40, between which in turn takes a break. This is followed by a second block 77, which has a greater current level and consists of six current pulses 40. After another pause, four current pulses 40 follow in the reverse direction, i. with changed polarity.

Als Abschluss der Sequenz 34 folgt ein weiterer Block 77 mit vier Strompulsen.
Die Sequenz 34 kann mehrfach wiederholt werden.The conclusion of the sequence 34 is followed by another block 77 with four current pulses.
The sequence 34 can be repeated several times.

Die Einzelpulszeiten ton betragen vorzugsweise größenordnungsmäßig etwa 1 bis 10 Millisekunden. Die zeitliche Dauer des Blocks 77 liegt in der Größenordnung bis zu 10 Sekunden, so dass bis zu 500 Pulse in einem Block 77 ausgesendet werden.The individual pulse times t on are preferably of the order of magnitude of about 1 to 10 milliseconds. The duration of the block 77 is on the order of up to 10 seconds, so that up to 500 pulses are emitted in a block 77.

Die Belegung sowohl während der Pulsabfolgen als auch in der Pausenzeit mit einem geringen Potenzial (Basisstrom) ist durchgeführt.The occupancy during both the pulse sequences and in the pause time with a low potential (base current) is performed.

Ein Block 77 ist mit seinen Parametern auf ein Bestandteil einer Legierung abgestimmt, die bspw. entschichtet werden soll, um das beste Entfernen dieses Bestandteils zu erreichen. Diese können in Einzelversuchen bestimmt werden.A block 77 is matched with its parameters to a constituent of an alloy, which is to be stripped, for example, in order to achieve the best removal of this constituent. These can be determined in individual experiments.

Claims (7)

  1. Process for removing a coating from a surface region of a component (13),
    in which an electrode (10)
    and the component (13) are arranged in an electrolyte,
    the electrode (10) and the component (13) being electrically connected to one another and to a current generator (16),
    characterized in that the current generator (16) generates a pulsed current and a base current by application of a potential.
  2. Process according to Claim 1,
    characterized in that
    an ultrasound probe (19) is operated in the electrolyte (7).
  3. Process according to Claim 1,
    characterized in that
    for the electrolytic coating removal a plurality of current/voltage pulses (40) are used repeatedly combined in a sequence (34),
    the sequence (34) being formed by at least two different blocks (77),
    one block (77) comprising at least one current pulse (40).
  4. Process according to Claim 3,
    characterized in that
    a block (77) is defined by a number of current pulses (40), pulse duration (ton), pulse interval (toff), current level (Imax) and pulse shape.
  5. Process according to Claim 3,
    characterized in that
    a block (77) is in each case matched to a constituent of an alloy which is to be removed in order to boost the removal of the constituent of the alloy.
  6. Process according to Claim 1,
    characterized in that
    the coating removed is an alloy layer of MCrAlY type, where M is an element selected from the group consisting of iron, cobalt or nickel.
  7. Process according to Claim 3,
    characterized in that
    a base current is superimposed on the current pulses (40) and/or the intervals.
EP05024433A 2002-04-08 2003-03-21 Method for removing surface areas of a component Expired - Fee Related EP1632589B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10215374 2002-04-08
DE10259365A DE10259365A1 (en) 2002-04-08 2002-12-18 Device and method for removing surface areas of a component
EP03727147A EP1507901B1 (en) 2002-04-08 2003-03-21 Device and method for removing surface areas of a component

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP03727147A Division EP1507901B1 (en) 2002-04-08 2003-03-21 Device and method for removing surface areas of a component

Publications (3)

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EP1632589A2 EP1632589A2 (en) 2006-03-08
EP1632589A3 EP1632589A3 (en) 2006-04-05
EP1632589B1 true EP1632589B1 (en) 2008-12-31

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EP05024433A Expired - Fee Related EP1632589B1 (en) 2002-04-08 2003-03-21 Method for removing surface areas of a component
EP03727147A Expired - Fee Related EP1507901B1 (en) 2002-04-08 2003-03-21 Device and method for removing surface areas of a component

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Country Status (6)

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US (2) US7569133B2 (en)
EP (2) EP1632589B1 (en)
CN (1) CN100379900C (en)
DE (3) DE10259365A1 (en)
ES (2) ES2292967T3 (en)
WO (1) WO2003085174A2 (en)

Cited By (1)

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EP4309811A1 (en) 2022-07-18 2024-01-24 Hammann GmbH Method for the electromechanical removal of deposits in pipelines or apparatus

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EP4309811A1 (en) 2022-07-18 2024-01-24 Hammann GmbH Method for the electromechanical removal of deposits in pipelines or apparatus

Also Published As

Publication number Publication date
ES2317127T3 (en) 2009-04-16
US20090255828A1 (en) 2009-10-15
ES2292967T3 (en) 2008-03-16
EP1507901A2 (en) 2005-02-23
WO2003085174A2 (en) 2003-10-16
CN1646735A (en) 2005-07-27
DE10259365A1 (en) 2003-10-30
US7569133B2 (en) 2009-08-04
US20050224367A1 (en) 2005-10-13
DE50308417D1 (en) 2007-11-29
EP1632589A3 (en) 2006-04-05
CN100379900C (en) 2008-04-09
EP1507901B1 (en) 2007-10-17
WO2003085174A3 (en) 2004-12-23
DE50311030D1 (en) 2009-02-12
EP1632589A2 (en) 2006-03-08

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