EP1507901A2 - Device and method for removing surface areas of a component - Google Patents
Device and method for removing surface areas of a componentInfo
- Publication number
- EP1507901A2 EP1507901A2 EP03727147A EP03727147A EP1507901A2 EP 1507901 A2 EP1507901 A2 EP 1507901A2 EP 03727147 A EP03727147 A EP 03727147A EP 03727147 A EP03727147 A EP 03727147A EP 1507901 A2 EP1507901 A2 EP 1507901A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- current
- component
- electrode
- pulse
- electrolyte
- 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
- 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 device and a method for removing surface areas of a component according to claims 1 and 3, respectively.
- MCrAlY or Zr ⁇ 2 are coated, for example by '
- Acid stripping in combination with sandblasting or decoated by high pressure water jets
- EP 1 122 323 AI and US 5,944,909 show examples of the chemical removal of surface areas.
- EP 1 941 34 AI, EP 1 010 782 AI and US Pat. No. 6,165,345 disclose methods for the electrochemical removal of metallic coatings (stripping).
- the object of the invention is therefore to show a device and a method in which the stripping takes place more quickly and more cheaply.
- the object is achieved by a device and a method for removing surface areas of a component according to claims 1 and 3, respectively.
- FIG. 1 shows a device according to the invention
- FIG. 2 a time profile of a current of a current pulse generator
- FIG 3 shows a further time profile of a current of a current pulse generator.
- FIG. 1 shows a device 1 according to the invention.
- the device 1 consists of a container 4 in which an electrolyte 7 is arranged.
- An electrode 10 and a component 13 are arranged in the electrolyte 7.
- the electrode 10 and the component 13 are electrically connected to a current / voltage pulse generator 16.
- the component 13 is, for example, a coated one
- Turbine blade which has a nickel or cobalt-based superalloy as a substrate, on which a metallic layer is applied, which serves, for example, as a corrosion protection or anchoring layer.
- a metallic layer which serves, for example, as a corrosion protection or anchoring layer.
- Such a layer has in particular the composition MCrAlY, where M stands for an element iron, cobalt or nickel.
- the coating is corroded during use of the turbine blade 13.
- the surface area 25 thus created (indicated by dashed lines) is to be removed by the method and the device 1 according to the invention.
- layer areas 25 which have arisen in the area near the surface due to corrosion, oxidation or other types of degradation can be removed from a component 13 which has no coating.
- the current pulse generator 16 generates a pulsed current / voltage signal (FIG. 2).
- the ultrasound 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 . There is a pause of length t 0 f between the individual pulses.
- the current pulse signal is determined by its current level I m ax.
- the current that flows between the electrode 10 and the component 13 (I m a ⁇ ) r the pulse duration (t on ) and the pulse pause (t 0 ff) have a significant influence on the electrochemical reaction by accelerating it.
- FIG. 3 shows an example of a series of current pulses 40 which are repeated.
- 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, ). The pauses between the individual current pulses 40 (t 0ff ) and the pauses between the blocks 77 are equally important as process parameters.
- the sequence 34 consists, for example, of a first block 77 with three current pulses 40, between which there is again a pause. This is followed by a second block 77, which has a larger current level and consists of six current pulses 40. After a further pause, four current pulses 40 follow in the opposite direction, ie with a changed polarity. At the end of sequence 34 there follows a further block 77 with four current pulses.
- the sequence 34 can be repeated several times.
- the individual pulse times t on are preferably on the order of about 1 to 10 milliseconds.
- the time duration of block 77 is of the order of up to 10 seconds, so that up to 500 pulses are transmitted in a block 77.
- a block 77 is matched with its parameters to a component of an alloy that is to be decoated, for example, in order to achieve the best removal of this component. These can be determined in individual experiments.
Landscapes
- 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)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05024433A EP1632589B1 (en) | 2002-04-08 | 2003-03-21 | Method for removing surface areas of a component |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10215374 | 2002-04-08 | ||
DE10215374 | 2002-04-08 | ||
DE10259365A DE10259365A1 (en) | 2002-04-08 | 2002-12-18 | Device and method for removing surface areas of a component |
DE10259365 | 2002-12-18 | ||
PCT/DE2003/000953 WO2003085174A2 (en) | 2002-04-08 | 2003-03-21 | Device and method for removing surface areas of a component |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05024433A Division EP1632589B1 (en) | 2002-04-08 | 2003-03-21 | Method for removing surface areas of a component |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1507901A2 true EP1507901A2 (en) | 2005-02-23 |
EP1507901B1 EP1507901B1 (en) | 2007-10-17 |
Family
ID=28792820
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05024433A Expired - Lifetime EP1632589B1 (en) | 2002-04-08 | 2003-03-21 | Method for removing surface areas of a component |
EP03727147A Expired - Lifetime EP1507901B1 (en) | 2002-04-08 | 2003-03-21 | Device and method for removing surface areas of a component |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05024433A Expired - Lifetime EP1632589B1 (en) | 2002-04-08 | 2003-03-21 | Method for removing surface areas of a component |
Country Status (6)
Country | Link |
---|---|
US (2) | US7569133B2 (en) |
EP (2) | EP1632589B1 (en) |
CN (1) | CN100379900C (en) |
DE (3) | DE10259365A1 (en) |
ES (2) | ES2292967T3 (en) |
WO (1) | WO2003085174A2 (en) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10259362A1 (en) * | 2002-12-18 | 2004-07-08 | Siemens Ag | Process for depositing an alloy on a substrate |
EP1473387A1 (en) * | 2003-05-02 | 2004-11-03 | Siemens Aktiengesellschaft | Method for stripping a coating from a part |
DE502004006578D1 (en) | 2004-06-30 | 2008-04-30 | Siemens Ag | Method and device for surface treatment of a component |
EP1860210A1 (en) * | 2006-05-22 | 2007-11-28 | Siemens Aktiengesellschaft | Method for electrolytic treatment of a workpiece |
EP1870497A1 (en) | 2006-06-23 | 2007-12-26 | Siemens Aktiengesellschaft | Method for the electrochemical stripping of a metallic coating from an element |
EP1890004A1 (en) * | 2006-08-08 | 2008-02-20 | Siemens Aktiengesellschaft | Method for the production of a deposited layer from recycled layer material |
DE102006044416A1 (en) * | 2006-09-18 | 2008-03-27 | Siemens Ag | Process for the electrochemical coating or stripping of components |
FR2937054B1 (en) | 2008-10-13 | 2010-12-10 | Commissariat Energie Atomique | METHOD AND DEVICE FOR DECONTAMINATING A METAL SURFACE |
DE102009036221A1 (en) * | 2009-08-05 | 2011-02-17 | Extrude Hone Gmbh | Method for the electrochemical machining of a workpiece |
US8357287B2 (en) * | 2009-11-23 | 2013-01-22 | MetCon LLC | Electrolyte solution and electropolishing methods |
US8580103B2 (en) | 2010-11-22 | 2013-11-12 | Metcon, Llc | Electrolyte solution and electrochemical surface modification methods |
CN103088398B (en) * | 2011-10-31 | 2016-05-11 | 通用电气公司 | Multi-channel electrochemical removes metallic coating system and control circuit thereof |
DE102012012419A1 (en) | 2012-06-25 | 2014-04-24 | OT Oberflächentechnik GmbH & Co. KG Schwerin | Device useful for local stripping of coated metal components, in particular coated turbine blades, comprises a brush for mechanical machining of the component to be stripped and for applying an electrolyte solution |
US9879356B2 (en) | 2014-03-18 | 2018-01-30 | Platit Ag | Method for delamination of ceramic hard material layers from steel and cemented carbide substrates |
DE202014010831U1 (en) | 2014-03-18 | 2016-11-23 | Platit Ag | Holder for stripping ceramic hard coatings of steel and carbide substrates |
US10227708B2 (en) | 2014-11-18 | 2019-03-12 | St. Jude Medical, Cardiology Division, Inc. | Systems and methods for cleaning medical device electrodes |
CN104611759B (en) * | 2015-02-12 | 2017-03-08 | 广州市精源电子设备有限公司 | Variable Polarity pulse pickling control method |
US10357839B1 (en) | 2015-10-08 | 2019-07-23 | The United States Of America As Represented By The Secretary Of The Army | Method for electrochemical machining using sympathetic waveform interactions |
MD1448Z (en) * | 2019-06-25 | 2021-02-28 | Сп Завод Топаз Ао | Process for removing heat-resistant coatings from a surface of hard alloys |
CN113106532B (en) * | 2021-04-07 | 2023-04-11 | 江苏源清动力技术有限公司 | Process for removing thermal barrier coating of thermal component of aero-engine and gas turbine |
EP4309811B1 (en) | 2022-07-18 | 2024-09-25 | Hammann GmbH | Method for the electromechanical removal of deposits in pipelines or apparatus |
Family Cites Families (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB190813666A (en) * | 1908-06-27 | 1908-12-31 | Alfred Levy | Process for Removing the Electrolytic Nickel or other Metallic Coating of Metallic Surfaces. |
US2408220A (en) * | 1943-02-05 | 1946-09-24 | Westinghouse Electric Corp | Stripping of copper from zinc |
US2744860A (en) * | 1951-11-13 | 1956-05-08 | Robert H Rines | Electroplating method |
DE1043008B (en) * | 1955-07-01 | 1958-11-06 | Othmar Ruthner | Process and device for the electrolytic removal of steel sand residues from sandblasted surfaces from metal strips |
US3616346A (en) * | 1967-03-20 | 1971-10-26 | Inoue K | Ion-control method for electrochemical machining |
US3519543A (en) * | 1967-10-27 | 1970-07-07 | Talon Inc | Process for electrolytically cleaning and polishing electrical contacts |
US4004992A (en) * | 1975-01-08 | 1977-01-25 | Trw Inc. | Power supply for electrochemical machining |
US4174261A (en) * | 1976-07-16 | 1979-11-13 | Pellegrino Peter P | Apparatus for electroplating, deplating or etching |
US4155816A (en) * | 1978-09-29 | 1979-05-22 | The Goodyear Tire & Rubber Company | Method of electroplating and treating electroplated ferrous based wire |
GB2111530B (en) * | 1981-12-08 | 1985-07-03 | Standard Telephones Cables Ltd | Selective electro plating or etching process |
US4466864A (en) * | 1983-12-16 | 1984-08-21 | At&T Technologies, Inc. | Methods of and apparatus for electroplating preselected surface regions of electrical articles |
US4664763A (en) * | 1985-05-08 | 1987-05-12 | M&T Chemicals Inc. | Process for stripping nickel or nickel-alloy plating in a chromic acid solution |
US5227036A (en) * | 1990-02-23 | 1993-07-13 | Gordon Roy G | Electrolytic removal of tin oxide from a coater |
IL110297A0 (en) * | 1993-07-21 | 1994-10-21 | Dynamotive Corp | A method for removal of certain oxide films from metal surfaces |
DE19547948C1 (en) * | 1995-12-21 | 1996-11-21 | Atotech Deutschland Gmbh | Mfg. unipolar or bipolar pulsed current for plating esp. of circuit boards at high current |
US5944909A (en) | 1998-02-02 | 1999-08-31 | General Electric Company | Method for chemically stripping a cobalt-base substrate |
US6402931B1 (en) * | 1998-05-18 | 2002-06-11 | Faraday Technology Marketing Group, Llc | Electrochemical machining using modulated reverse electric fields |
US6056869A (en) * | 1998-06-04 | 2000-05-02 | International Business Machines Corporation | Wafer edge deplater for chemical mechanical polishing of substrates |
US6203691B1 (en) * | 1998-09-18 | 2001-03-20 | Hoffman Industries International, Ltd. | Electrolytic cleaning of conductive bodies |
US6176999B1 (en) | 1998-12-18 | 2001-01-23 | United Technologies Corporation | Feedback controlled stripping of airfoils |
US6165345A (en) | 1999-01-14 | 2000-12-26 | Chromalloy Gas Turbine Corporation | Electrochemical stripping of turbine blades |
TW533249B (en) * | 1999-09-07 | 2003-05-21 | Nat Science Council | Method and apparatus for electropolishing |
US6352636B1 (en) | 1999-10-18 | 2002-03-05 | General Electric Company | Electrochemical system and process for stripping metallic coatings |
US6428602B1 (en) | 2000-01-31 | 2002-08-06 | General Electric Company | Method for recovering platinum from platinum-containing coatings on gas turbine engine components |
US6599416B2 (en) * | 2001-09-28 | 2003-07-29 | General Electric Company | Method and apparatus for selectively removing coatings from substrates |
-
2002
- 2002-12-18 DE DE10259365A patent/DE10259365A1/en not_active Withdrawn
-
2003
- 2003-03-12 US US10/511,251 patent/US7569133B2/en not_active Expired - Fee Related
- 2003-03-21 CN CNB038077264A patent/CN100379900C/en not_active Expired - Fee Related
- 2003-03-21 EP EP05024433A patent/EP1632589B1/en not_active Expired - Lifetime
- 2003-03-21 EP EP03727147A patent/EP1507901B1/en not_active Expired - Lifetime
- 2003-03-21 ES ES03727147T patent/ES2292967T3/en not_active Expired - Lifetime
- 2003-03-21 WO PCT/DE2003/000953 patent/WO2003085174A2/en active IP Right Grant
- 2003-03-21 ES ES05024433T patent/ES2317127T3/en not_active Expired - Lifetime
- 2003-03-21 DE DE50308417T patent/DE50308417D1/en not_active Expired - Lifetime
- 2003-03-21 DE DE50311030T patent/DE50311030D1/en not_active Expired - Lifetime
-
2009
- 2009-06-25 US US12/491,499 patent/US20090255828A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO03085174A2 * |
Also Published As
Publication number | Publication date |
---|---|
ES2317127T3 (en) | 2009-04-16 |
WO2003085174A2 (en) | 2003-10-16 |
DE50308417D1 (en) | 2007-11-29 |
EP1507901B1 (en) | 2007-10-17 |
CN100379900C (en) | 2008-04-09 |
ES2292967T3 (en) | 2008-03-16 |
WO2003085174A3 (en) | 2004-12-23 |
US20050224367A1 (en) | 2005-10-13 |
DE50311030D1 (en) | 2009-02-12 |
DE10259365A1 (en) | 2003-10-30 |
CN1646735A (en) | 2005-07-27 |
EP1632589A3 (en) | 2006-04-05 |
US20090255828A1 (en) | 2009-10-15 |
US7569133B2 (en) | 2009-08-04 |
EP1632589B1 (en) | 2008-12-31 |
EP1632589A2 (en) | 2006-03-08 |
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