US20070295614A1 - Method for Monitoring an Electrochemical Treatment Process and Electrode Arrangement Suited for Carrying Out This Method - Google Patents

Method for Monitoring an Electrochemical Treatment Process and Electrode Arrangement Suited for Carrying Out This Method Download PDF

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Publication number
US20070295614A1
US20070295614A1 US11/667,331 US66733105A US2007295614A1 US 20070295614 A1 US20070295614 A1 US 20070295614A1 US 66733105 A US66733105 A US 66733105A US 2007295614 A1 US2007295614 A1 US 2007295614A1
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US
United States
Prior art keywords
electrode arrangement
counter
individual electrodes
electrode
workpiece
Prior art date
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Abandoned
Application number
US11/667,331
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English (en)
Inventor
Axel Arndt
Uwe Pyritz
Gabriele Winkler
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Siemens AG
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Siemens AG
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Filing date
Publication date
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Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARNDT, AXEL, PYRITZ, UWE, WINKLER, GABRIELE
Publication of US20070295614A1 publication Critical patent/US20070295614A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/10—Electrodes, e.g. composition, counter electrode
    • C25D17/12—Shape or form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H11/00—Auxiliary apparatus or details, not otherwise provided for
    • B23H11/006—Electrical contacts or wires
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/10—Electrodes, e.g. composition, counter electrode
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/12—Process control or regulation
    • 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
    • C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating

Definitions

  • the invention relates to a method for monitoring an electrochemical treatment process for a workpiece forming a working electrode, in which a predetermined potential between working electrode and the counter-electrode arrangement is maintained using a reference electrode arrangement.
  • EP 639 769 A2 discloses a method in which a defined potential is applied between a working electrode and a counter-electrode, with this potential being maintained during the electrochemical treatment process by means of a reference electrode.
  • a reference electrode For this purpose the working electrode, the counter-electrode and the reference electrode are connected to a potentiostat.
  • An object of invention is to specify a method for monitoring an electrochemical treatment process, with the aid of which this treatment process can be controlled comparatively precisely based on the desired treatment result.
  • the reference electrode arrangement featuring a number of individual electrodes which are guided at a number of locations in a non-contact fashion to the surface of the workpiece to be treated.
  • the use of a reference electrode arrangement with a number of individual electrodes advantageously ensures that a locally-resolved measurement can be undertaken as regards the workpiece surface regarding the setting of the predetermined potential.
  • the measured values created by the individual electrodes can then be taken into account in setting the predetermined potential.
  • the measurement results of the individual electrodes can be considered separately or it is possible to consider all electrodes together.
  • the measured values determined by means of the reference electrode arrangement can further be used to optimize the interaction of the workpiece with the counter-electrode arrangement. In this case for example distances or also the shaping of the counter-electrode arrangement can be modified, for example to accommodate non-planar workpiece geometries in respect of a uniform electrochemical treatment result.
  • electrochemical methods are to be understood as electrochemical treatment processes in the sense of the invention. Such processes can typically involve the electrochemical removal of layers, the electrochemical dissolving of layers (decoating or stripping), electrochemical polishing (surface treatment) or also an electrochemical shaping (e.g. drilling).
  • a voltage to be applied to the workpiece and to the counter-electrode arrangement before the electrochemical treatment which creates a low measurement current by comparison with the treatment process current, and for comparison potentials to be determined in each case at the individual electrodes of electrodes combined into a number of groups of the reference electrode arrangement.
  • the measurement result created can thus be resolved in the way specified above in respect of the position on the surface of the component to be treated. Since only a small measurement current is used, the measurement result is only affected slightly by the processes normally executing in electrochemical treatment. Thus the measurement result created can for example be used for an exact positioning of the counter-electrode with complex workpiece geometries.
  • regions of the workpiece can be detected which may be problematic for carrying out the electrochemical treatment process. These can for example be taken into account by adapting the geometry of the counter-electrode arrangement (e.g. measures for modifying the local process-related current density of the process current at these points).
  • the individual electrodes of the reference electrode arrangement can also be combined electrically into a group, so that these create a joint measured value.
  • the reference electrode arrangement can be used to arrange the counter-electrode arrangement in relation to the workpiece such that the comparison potentials of the relevant individual electrodes are balanced as far as possible. If the electrochemical treatment process is then started, a comparatively balanced current density is achieved with a counter-electrode arrangement aligned in this way over the surface of the workpiece, which advantageously enables an even treatment result to be achieved.
  • inventive method can be used to apply the potential predetermined for the process to the workpiece and to the counter-electrode arrangement, with the reference electrodes being connected electrically in parallel to monitor the potential.
  • the reference electrode arrangement serves in this case in the known way to maintain the potential relationships demanded for the treatment process and can be connected to a potentiostat for this purpose for example.
  • the individual electrodes of the reference electrode arrangement connected in parallel behave like resistors connected in parallel, so that the same potential is present at them in each case.
  • the invention further relates to a counter-electrode arrangement for the electrochemical treatment of workpieces, in which the workpiece forms the working electrode.
  • This type of counter-electrode arrangement is for example known from EP 1 094 134 A1.
  • This counter-electrode arrangement consists of two electrode plates, which can be directed from both sides onto a turbine blade from which the coating is to be removed.
  • the electrode plates can in this case have surfaces designed in accordance with the profile of the turbine blade. This allows a constant distance to be maintained between the electrode plates and the surface of the turbine blade from which the surface is to be removed.
  • a further object of the invention is to specify a counter-electrode arrangement for electrochemical treatment processes with which the counter-electrode arrangement can be positioned in a simple manner in relation to a workpiece to be treated.
  • this object is achieved with the counter-electrode arrangement mentioned, by a reference electrode arrangement being mechanically connected to the counter-electrode arrangement, with the connection being embodied as electrical isolation between the counter-electrode arrangement and the reference electrode arrangement and the reference electrode arrangement being embodied from a number of individual electrodes, with electrode tips which are able to be moved within a treatment area provided for the workpiece.
  • a simple alignment of the counter-electrode arrangement can advantageously be undertaken when the counter-electrode is aligned in relation to the workpiece to be treated, since, to achieve a working potential necessary for even treatment between counter-electrode arrangement and workpiece, a comparison potential can be determined by means of the reference electrode arrangement with a local resolution over the surface of the workpiece. The method needed for this has already been explained.
  • the mechanical coupling between counter-electrode arrangement and reference electrode arrangement means that precise geometrical circumstances are advantageously defined between the two electrode arrangements, so that an alignment of the reference electrode arrangement automatically leads to an alignment of the counter-electrode arrangement.
  • connection points between counter-electrode arrangement and reference electrode arrangement must be electrically isolated to enable the two electrode systems to be operated independently of one another.
  • the electrically isolating connection can preferably consist of electrically isolating connection elements. These can for example be attached in the counter-electrode arrangement and simultaneously implement a guide for the individual electrodes of the reference electrode arrangement.
  • the counter-electrodes of the counter-electrode arrangement there is provision for the counter-electrodes of the counter-electrode arrangement to be embodied flat and be able to be deformed within the treatment area.
  • the counter-electrode can for example be designed as a flexible grid. This allows the deformable counter-electrode arrangement to be adapted in the optimum way to the geometry of the workpiece to be treated. In this case the deformability allows an adaptation within a treatment area defined by the limits of the deformability. This enables workpieces to be treated evenly provided their surface to be handled lies within the treatment area.
  • the individual electrodes of the counter-electrode arrangement can advantageously be embodied in the form of bars and can be fixed axially in the counter-electrode. They can preferably be fixed with the connecting pieces already described.
  • the axial displacement capability of the individual electrodes makes it possible to position the electrode tip with smaller distance to the surface of the workpiece than the distance between the counter-electrode arrangement and the workpiece surface. This is especially of advantage for the generation of measured values in executing the electrochemical treatment method.
  • the individual electrodes are held to allow axial movement in an electrode carrier. This allows the electrode tips to be adapted to the contour of the workpiece to be treated, so that an even distance between the electrode tip and the workpiece surface is produced. If the deformable flat counter-electrode is attached rigidly to the rod-shaped individual electrodes, displacement of the individual electrodes simultaneously allows the adaptation of the counter-electrode to the contour of the workpiece to be treated. In this case the individual electrodes are advantageously additionally given a support function for the counter-electrode arrangement.
  • FIG. 1 an exemplary embodiment of the inventive counter-electrode arrangement in an electrochemical treatment bath for executing exemplary embodiments of the inventive method
  • FIG. 2 the structure of an exemplary embodiment of the inventive counter-electrode arrangement as a sectional view.
  • An electrochemical treatment bath 12 is poured into a container 11 .
  • a workpiece 13 for example the blades a gas turbine, not shown
  • a counter-electrode arrangement 14 fixed in the treatment bath.
  • the counter-electrode arrangement consists of a flexible, grid-type counter-electrode 15 and a contacting system 16 .
  • connecting pieces 17 are fixed in the grid, in which bar-shaped individual electrodes 18 are held electrically isolating.
  • These form a reference electrode arrangement 19 with the electrode tips 20 pointing towards but not making contact with the surface to be treated 21 of the workpiece 13 , whereas contacting systems 22 are provided at the opposite ends of the individual electrodes 20 .
  • the individual electrodes 18 are further aligned in their axial extension at right angles to the surface 21 and also penetrate the counter-electrode 15 at a right angle to their spatial alignment, so that the counter-electrode 15 runs essentially in parallel to the surface 21 .
  • the workpiece 13 , the counter-electrode arrangement 14 and the reference electrode arrangement 19 can be connected via electrical lines 23 to a potentiostat 24 .
  • the individual electrodes 18 are connected via individual lines 25 with a switching unit 26 , via which an electrical connection to the potentiostat 24 is established.
  • the switching unit further features a control and evaluation unit 27 . With this the individual electrodes 18 can be switched individually in parallel in respective groups with the aid of the switching unit 26 or switched in parallel in their entirety.
  • the described arrangement of workpiece 13 (working electrode), counter-electrode arrangement 14 and reference electrode arrangement 19 with potentiostat 24 , switching unit 26 and control and evaluation unit 27 allows a number of operating states.
  • a measurement current can be created between the workpiece 13 and the counter-electrode arrangement 14 by means of the potentiostat 24 which is so small that it does not disturb a measurement with the aid of the reference electrode arrangement 19 .
  • the individual electrodes 25 a local measurement potential can then be measured which is present between the respective electrode tip and the local, adjoining surface areas of the workpiece 13 .
  • the geometry of the counter-electrode 15 is modified until such time as the comparison potential at the individual electrodes 18 is at least largely balanced.
  • the data is processed in this case by the control and evaluation unit 27 .
  • the desired electrochemical treatment process is undertaken.
  • This can for example consist, for worn turbine blades, of removing the coating and of subsequently recoating the blade, so that the turbine blades can be used again.
  • the individual electrodes in the control unit are switched electrically in parallel and are connected to the potentiostat 24 to maintain constant treatment parameters.
  • the individual electrodes 20 are axially guided in an electrode carrier 28 .
  • the figure also shows the connecting pieces 17 , which are rigidly attached to the individual electrodes and are connected on their other side to the grid of the counter-electrode 15 (for example through casting) If the individual electrodes are axially displaced in the electrode carrier 28 , the counter-electrode 15 thus accordingly matches the axial displacement.
  • the contacting systems 22 are embodied as plug-in connectors (not shown) for the individual lines 25 .
  • the electrode carrier 28 also brings about a parallel alignment between the individual electrodes 18 .
  • a constant distance between the electrode tip 20 and a surface (not shown) of the workpiece to be treated means that simultaneously a constant distance between the counter-electrode and this surface is obtained.

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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)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
US11/667,331 2004-11-17 2005-11-16 Method for Monitoring an Electrochemical Treatment Process and Electrode Arrangement Suited for Carrying Out This Method Abandoned US20070295614A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004056158A DE102004056158B3 (de) 2004-11-17 2004-11-17 Verfahren zum Überwachen eines elektrochemischen Behandlungsprozesses und für dieses Verfahren geeignete Elektrodenanordnung
DE102004056158.3 2004-11-17
PCT/EP2005/056005 WO2006053877A1 (de) 2004-11-17 2005-11-16 Verfahren zum überwachen eines elektrochemischen behandlungsprozesses und für dieses verfahren geeignete elektrodenanordnung

Publications (1)

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US20070295614A1 true US20070295614A1 (en) 2007-12-27

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US11/667,331 Abandoned US20070295614A1 (en) 2004-11-17 2005-11-16 Method for Monitoring an Electrochemical Treatment Process and Electrode Arrangement Suited for Carrying Out This Method

Country Status (4)

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US (1) US20070295614A1 (de)
EP (1) EP1819849A1 (de)
DE (1) DE102004056158B3 (de)
WO (1) WO2006053877A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100072072A1 (en) * 2008-09-19 2010-03-25 Daniel Beckel Method for the restoration of a metallic coating
US20150184310A1 (en) * 2013-12-30 2015-07-02 Hyundai Motor Company Pipe surface treating method for fuel cell system
US10137516B2 (en) 2014-09-11 2018-11-27 MTU Aero Engines AG Electrochemical machining of a workpiece
EP4043619A4 (de) * 2019-09-29 2024-01-10 Yuming Zhang Elektroplattierungsanode und elektroplattierungsverfahren unter verwendung derselben

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2958300B1 (fr) * 2010-03-31 2012-05-04 Snecma Dispositif pour controler des caracteristiques physiques d'un bain d'electrodeposition metallique.
DE102015219233A1 (de) * 2015-10-06 2017-04-06 Continental Automotive Gmbh Vorrichtung zum Bearbeiten eines Werkstücks für einen Fluidinjektor und Verfahren zum Herstellen eines Düsenkörpers für einen Fluidinjektor
DE102018004841B9 (de) * 2018-06-13 2020-12-03 Hooshiar Mahdjour Verfahren und Vorrichtung zur automatisierten Regelung der Ströme in einem Galvanikbad

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040173461A1 (en) * 2003-03-04 2004-09-09 Applied Materials, Inc. Method and apparatus for local polishing control

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE806508C (de) * 1949-09-10 1951-06-14 Siemens & Halske A G Formanode fuer das galvanische Aufbringen von metallischen Schichten auf ebene oder leicht gekruemmte Flaechen
FI91997C (fi) * 1993-08-20 1994-09-12 Conrex Oy Elektrodijärjestelmän, johon kuuluu mittauselektrodi, vertailuelektrodi ja vastaelektrodi, käyttö vetyperoksidin pitoisuuden mittaamisessa
US6352636B1 (en) * 1999-10-18 2002-03-05 General Electric Company Electrochemical system and process for stripping metallic coatings
DE10100297A1 (de) * 2001-01-04 2002-07-18 Gesimat Gmbh Vorrichtung und Verahren zur elektrochemischen Beschichtung
DE10132408C2 (de) 2001-07-04 2003-08-21 Fraunhofer Ges Forschung Elektrode mit veränderbarer Form

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040173461A1 (en) * 2003-03-04 2004-09-09 Applied Materials, Inc. Method and apparatus for local polishing control

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100072072A1 (en) * 2008-09-19 2010-03-25 Daniel Beckel Method for the restoration of a metallic coating
US20150184310A1 (en) * 2013-12-30 2015-07-02 Hyundai Motor Company Pipe surface treating method for fuel cell system
US10137516B2 (en) 2014-09-11 2018-11-27 MTU Aero Engines AG Electrochemical machining of a workpiece
EP4043619A4 (de) * 2019-09-29 2024-01-10 Yuming Zhang Elektroplattierungsanode und elektroplattierungsverfahren unter verwendung derselben

Also Published As

Publication number Publication date
DE102004056158B3 (de) 2006-03-30
EP1819849A1 (de) 2007-08-22
WO2006053877A1 (de) 2006-05-26

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Owner name: SIEMENS AKTIENGESELLSCHAFT, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ARNDT, AXEL;PYRITZ, UWE;WINKLER, GABRIELE;REEL/FRAME:019338/0582

Effective date: 20070403

STCB Information on status: application discontinuation

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