EP0074463A1 - Method and apparatus for cleaning the inner walls of metallic tubular systems by electropolishing by means of moving electrodes - Google Patents

Method and apparatus for cleaning the inner walls of metallic tubular systems by electropolishing by means of moving electrodes Download PDF

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Publication number
EP0074463A1
EP0074463A1 EP82104945A EP82104945A EP0074463A1 EP 0074463 A1 EP0074463 A1 EP 0074463A1 EP 82104945 A EP82104945 A EP 82104945A EP 82104945 A EP82104945 A EP 82104945A EP 0074463 A1 EP0074463 A1 EP 0074463A1
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EP
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Prior art keywords
electrode
metallic
pressure
electropolishing
cleaning
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EP82104945A
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German (de)
French (fr)
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EP0074463B1 (en
Inventor
Manfred Kienhöfer
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Forschungszentrum Karlsruhe GmbH
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Kernforschungszentrum Karlsruhe GmbH
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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
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/16—Polishing
    • 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
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/001—Decontamination of contaminated objects, apparatus, clothes, food; Preventing contamination thereof
    • G21F9/002—Decontamination of the surface of objects with chemical or electrochemical processes
    • G21F9/004—Decontamination of the surface of objects with chemical or electrochemical processes of metallic surfaces
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/001—Decontamination of contaminated objects, apparatus, clothes, food; Preventing contamination thereof
    • G21F9/005—Decontamination of the surface of objects by ablation

Definitions

  • the invention relates to a method for cleaning the inner walls of metallic line systems by electropolishing with the aid of moving electrodes and a device for carrying out the method.
  • the invention has for its object to provide a method and a device with which (which) a metallic pipe system can be cleaned, without having to dismantle it.
  • pipe system should be understood here: a system of straight and curved pipes, including the associated shut-off devices, such as ball valves, slides or the like.
  • the process should also be able to successfully clean rising and falling pipes immediately.
  • the method and the device should be usable in particular for the decontamination of radioactive contaminated line systems.
  • the object is achieved in that the electrolyte is applied by means of high pressure of approximately 50 bar or more to a section of the wall of the line system, and that the cathode is moved in the line system with the aid of the high pressure jet.
  • the device according to the invention for carrying out the method is characterized by an elastic high-pressure hose with a metallic stabilizing element serving as a current conductor or with a metallic strand serving as a current conductor, which at its end is provided with a high-pressure nozzle with a plurality of openings arranged radially and at an angle to the inner wall of the line system and by an elastic, metallic electrode which is arranged around the end piece of the high-pressure hose and connected to the current conductor, and by several insulating spacers which are arranged on the high-pressure hose in a fixed or displaceable manner, at least in the electrode area.
  • the electrode of the device according to the invention can be designed as a spiral cathode or as a coiled strip.
  • the high pressure is at the head nozzle an elastic cap and at the end of the electrode facing away from the nozzle a spacer with a larger area by a factor of 1 than that of the spacer (s) within the electrode area, but smaller area than the smallest cross-section of the pipe system to be traversed corresponds, vorgeseheri.
  • the electrolyte to be used is thrown through the high-pressure jet nozzle at a pressure from approx. 50 bar to approx. 600 bar onto the inner wall of the pipe.
  • the independent forward movement of the electrode inside the tube is achieved by the electrolyte jets directed obliquely against the tube wall.
  • the electrolyte rays allow the current to pass through. A current between 300 and 400 amperes is sufficient in most cases.
  • a decontamination factor of 300 was achieved, which could be increased by a factor of 10 after the inner wall 2 of the pipe was again sprayed (rinsed) with warm water and high pressure, so that a total decontamination factor of 3000 was achieved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Food Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Cleaning In General (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

1. Method for cleaning the inner walls of metallic pipework systems by electropolishing using mobile electrodes, wherein the electrolyte is filled into the pipework system, with the electrode applied to a sector of the pipework wall by means of about 5 MPa high pressure, and the cathode moved in the pipework system by means of the high pressure jet.

Description

Die Erfindung betrifft ein Verfahren zur Reinigung der Innenwände von metallischen Leitungssystemen durch Elektropolieren mit Hilfe bewegter Elektroden und eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for cleaning the inner walls of metallic line systems by electropolishing with the aid of moving electrodes and a device for carrying out the method.

Das Entfernen von Verunreinigungen von metallischen Oberflächen, die schwer zugänglich bzw. erreichbar sind, wie z.B. die Innenwände von Rohren bzw. anderen Elementen von metallischen Leitungssystemen, insbesondere die Dekontamination von radioaktiven Verunreinigungen in solchen Systemen, war bisher nicht in jedem Falle mit gutem Erfolg bzw. zufriedenstellend auszuführen. Eines der gebräuchlichsten Verfahren hierfür ist das Elektropolieren. Jedoch konnten bisher nur wenige Meter lange demontierte Rohre mit beweglichen Elektroden innenseitig behandelt werden. Dazu wurden sowohl das gesamte Eintauchen des Rohres in den Elektrolyten als auch das Füllen von zuvor abgedichteten Kammern im Rohr (Rohrstücken) angewendet (R.P. Allen und H.W. Arrowsmith, Materials Performance, Vol. 18, No. 11, Seiten 21 bis 26 (1979)).Removing contaminants from metallic surfaces that are difficult to access, such as The inner walls of pipes or other elements of metallic piping systems, in particular the decontamination of radioactive contaminants in such systems, have so far not always been able to be carried out successfully or satisfactorily. One of the most common methods for this is electropolishing. However, previously dismantled pipes with movable electrodes could only be treated on the inside. For this purpose, both the entire immersion of the tube in the electrolyte and the filling of previously sealed chambers in the tube (tube pieces) were used (RP Allen and HW Arrowsmith, Materials Performance, Vol. 18, No. 11, pages 21 to 26 (1979) ).

Einer der gravierenden Nachteile dieses Verfahrens bestand in der Notwendigkeit, die zu reinigenden Rohre vor dem Elektropolieren ausbauen zu müssen. Außerdem war es nicht möglich, über mehrere Krümmer hinweg oder gar durch Absperrschieber bzw. Hähne hindurchzufahren.One of the serious disadvantages of this process was the need to remove the pipes to be cleaned before electropolishing. In addition, it was not possible to drive across multiple elbows or even through gate valves or taps.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zu schaffen, mit welchem (welcher) ein metallisches Leitungssystem gereinigt werden kann, ohne es demontieren zu müssen. Unter Leitungssystem soll hier verstanden werden: Ein System von geraden und gekrümmten Rohren, einschließlich der zugehörigen Absperrorgane, wie z.B. Kugelhähne, Schieber oder ähnliches. Mit dem Verfahren sollen auch steigende bzw. fallende Leitungen gleich erfolgreich gereinigt werden können. Das Verfahren und die Vorrichtung sollen insbesondere für die Dekontamination von radioaktiv verunreinigter Leitungssysteme verwendbar sein.The invention has for its object to provide a method and a device with which (which) a metallic pipe system can be cleaned, without having to dismantle it. The term pipe system should be understood here: a system of straight and curved pipes, including the associated shut-off devices, such as ball valves, slides or the like. The process should also be able to successfully clean rising and falling pipes immediately. The method and the device should be usable in particular for the decontamination of radioactive contaminated line systems.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß man den Elektrolyten mittels Hochdruck von ca. 5o bar oder mehr auf ein Teilstück der Wandung des Leitungssystemes aufbringt, und daß man die Kathode mit Hilfe des Hochdruckstrahls im Leitungssystem bewegt.The object is achieved in that the electrolyte is applied by means of high pressure of approximately 50 bar or more to a section of the wall of the line system, and that the cathode is moved in the line system with the aid of the high pressure jet.

Die erfindungsgemäße Vorrichtung zur Durchführung des Verfahrens ist gekennzeichnet durch einen elastischen Hochdruckschlauch mit einem metallischen, als Stromleiter dienenden Stabilisierungselement oder mit einer metallischen, als Stromleiter dienenden Litze, der an seinem Ende mit einer Hochdruckdüse mit mehreren radial und winkelig zur Innenwand des Leitungssystems angeordneten öffnungen versehen ist, und durch eine elastische, metallische, um das Endstück des Hochdruckschlauches angeordnete und mit dem Stromleiter verbundene Elektrode, sowie durch mehrere, zumindest im Elektrodenbereich fest oder verschiebbar auf dem Hochdruckschlauch angeordnete, isolierende Abstandshalter.The device according to the invention for carrying out the method is characterized by an elastic high-pressure hose with a metallic stabilizing element serving as a current conductor or with a metallic strand serving as a current conductor, which at its end is provided with a high-pressure nozzle with a plurality of openings arranged radially and at an angle to the inner wall of the line system and by an elastic, metallic electrode which is arranged around the end piece of the high-pressure hose and connected to the current conductor, and by several insulating spacers which are arranged on the high-pressure hose in a fixed or displaceable manner, at least in the electrode area.

Die Elektrode der erfindungsgemäßen Vorrichtung kann als spiralförmige Kathode oder als gewendeltes Band ausgebildet sein. In einer vorteilhaften Ausbildung der erfindungsgemäßen Vorrichtung ist am Kopf der Hochdruckdüse eine elastische Kappe und an dem der Düse abgewandten Ende der Elektrode ein Abstandshalter mit einer um den Faktor 1 größeren Fläche als jeweils derjenigen der (des) Abstandhalter(s) innerhalb des Elektrodenbereiches, jedoch kleineren Fläche, als dem kleinsten zu durchfahrenden Querschnitt des Leitungssystems entspricht,vorgeseheri.The electrode of the device according to the invention can be designed as a spiral cathode or as a coiled strip. In an advantageous embodiment of the device according to the invention, the high pressure is at the head nozzle an elastic cap and at the end of the electrode facing away from the nozzle a spacer with a larger area by a factor of 1 than that of the spacer (s) within the electrode area, but smaller area than the smallest cross-section of the pipe system to be traversed corresponds, vorgeseheri.

Durch die Elastizität der Elektroden ist eine Anpassung an gekrümmte Flächen möglich. Durch das selbständige Fördern mittels Hochdruckstrahl-Rückstoß ist eine Demontage der zu polierenden Rohre nicht mehr nötig und es kann sowohl durch Krümmer und Schieber als auch in geneigten Leitungen gearbeitet werden. Durch den gleichzeitigen Einsatz von Hochdruckstrahlen ist eine wesentlich bessere Reinigung der Rohre erzielbar. Durch die selbständige Förderung ist es möglich, Rohre fernbedient zu elektropolieren, wodurch die Strahlenbelastung des Personals wesentlich verringert werden kann. Der zu verwendende Elektrolyt wird durch die Hochdruckstrahldüse mit einem Druck ab ca. 50 bar bis ca. 600 bar auf die Innenwand des Rohres geschleudert. Durch die schräg gegen die Rohrwand gerichteten Elektrolytstrahlen wird die selbständige Vorwärtsbewegung der Elektrode im Inneren des Rohres erreicht. Die Elektrolytstrahlen ermöglichen den Stromdurchgang. Eine Stromstärke zwischen 300 und 400 Ampere reicht in den meisten Fällen aus.Due to the elasticity of the electrodes, an adaptation to curved surfaces is possible. Due to the independent conveying by means of high-pressure jet recoil, dismantling of the pipes to be polished is no longer necessary and work can be carried out using elbows and slides as well as in inclined lines. By using high pressure jets at the same time, the pipes can be cleaned much better. The independent funding makes it possible to electropolish pipes remotely, which can significantly reduce the radiation exposure of the personnel. The electrolyte to be used is thrown through the high-pressure jet nozzle at a pressure from approx. 50 bar to approx. 600 bar onto the inner wall of the pipe. The independent forward movement of the electrode inside the tube is achieved by the electrolyte jets directed obliquely against the tube wall. The electrolyte rays allow the current to pass through. A current between 300 and 400 amperes is sufficient in most cases.

Im folgenden wird die Erfindung anhand eines Durchführungsbeispieles und anhand der Zeichnung erläutert:

  • Zur Dekontamination der mit radioaktiven Verunreinigungen kontaminierten Innenwand 2 eines Leitungssystems 1 wurde in dieses ein elastischer Hochdruckschlauch 5, der an seinem Ende 7 mit einer Edelstahlhochdruckstrahldüse 9 versehen war und um welchen eine Elektrode 4 aus einem 3 mm starken VA-Draht,ca. 30 mm lang gewickelt war und der zwei Abstandshalter 11 und 12 aus Kunststoff aufwies, eingeführt. Mit einer Hochdruckstrahlpumpe (in der Zeichnung nicht dargestellt) mit einer Leistung von 50 bar wurde der Elektrolyt mit einer Geschwindigkeit von 1200 1/Stunde durch den Hochdruckschlauch 5 und die Strahldüse 9 in das Rohrsystem, dessen Nennweite 150 mm betrug,bzw. auf dessen Innenwand 2 geschleudert. Das Rohrsystem bestand in diesem Falle aus einem 5 m langen Rohr mit einem Bogen von 90° in der Mitte. Die Hochdruckdüse 9 wies eine Reihe von Öffnungen 10 auf, die so angeordnet waren, daß der Elektrolyt winkelig zur Innenwand 2 des Rohres 1 auf die Wand auftraf. Die Geschwindigkeit der Vorwärtsbewegung der Vorrichtung innerhalb des Rohres betrug 5 cm/Minute. Der Strom floß von der nichtdargestellten Stromquelle durch den Stromleiter 6, durch die mit diesem verbundene, um das Endstück 8 des Hochdruckschlauches 5 angeordnete Elektrode 4 und wurde durch den Elektrolyten 3 und die metallische Innenwand 2 des Rohres 1 zurückgeleitet. Die Stromstärke lag bei ca. 300 Ampere. Die Hochdruckdüse 9 besaß an ihrem Kopf eine elastische Kappe 13, die gemeinsam mit dem an dem der Düse abgewandten Ende der Elektrode angeordneten Abstandshalter 12 bewirkte, daß der durch die Hochdruckdüse 9 geschleuderte Elektrolyt 3 nicht zu rasch wieder abfloß. Die isolierenden Abstandshalter 11 und 12 waren in diesem Falle dreiarmige Sterne, die eine zentrale öffnung aufwiesen, so daß sie auf den Hochdruckschlauch 5 aufgeschoben werden konnten. Der Abstandshalter 12 wies dabei eine doppelt so große Querschnittsfläche wie der Abstandhalter 1 auf.
The invention is explained below using an exemplary embodiment and the drawing:
  • For decontamination of the inner wall 2 of a line system 1 contaminated with radioactive contaminants This was an elastic high pressure hose 5, which was provided at its end 7 with a stainless steel high pressure jet nozzle 9 and around which an electrode 4 made of a 3 mm thick VA wire, approx. Was wrapped 30 mm long and the two spacers 11 and 12 made of plastic, introduced. With a high pressure jet pump (not shown in the drawing) with an output of 50 bar, the electrolyte was at a speed of 1200 1 / hour through the high pressure hose 5 and the jet nozzle 9 into the pipe system, the nominal width of which was 150 mm or. hurled on the inner wall 2. In this case, the pipe system consisted of a 5 m long pipe with a 90 ° bend in the middle. The high pressure nozzle 9 had a series of openings 10 which were arranged such that the electrolyte struck the wall at an angle to the inner wall 2 of the tube 1. The speed of advancing the device within the tube was 5 cm / minute. The current flowed from the current source, not shown, through the current conductor 6, through the electrode 4 connected to it, around the end piece 8 of the high-pressure hose 5, and was returned through the electrolyte 3 and the metallic inner wall 2 of the tube 1. The current was about 300 amps. The high-pressure nozzle 9 had an elastic cap 13 on its head which, together with the spacer 12 arranged on the end of the electrode facing away from the nozzle, caused the electrolyte 3 thrown by the high-pressure nozzle 9 not to drain off too quickly. In this case, the insulating spacers 11 and 12 were three-armed stars which had a central opening so that they could be pushed onto the high-pressure hose 5. The spacer 12 had a cross-sectional area twice as large as that of the spacer 1.

Es wurde ein Dekontaminationsfaktor von 300 erreicht, der nachdem die Rohrinnenwand 2 noch einmal mit warmem Wasser und Hochdruck abgespritzt (gespült) wurde, um den Faktor 10 erhöht werden konnte, so daß insgesamt ein Dekontaminationsfaktor von 3000 erreicht wurde.A decontamination factor of 300 was achieved, which could be increased by a factor of 10 after the inner wall 2 of the pipe was again sprayed (rinsed) with warm water and high pressure, so that a total decontamination factor of 3000 was achieved.

Claims (5)

1. Verfahren zur Reinigung der Innenwände von metallischen Leitungssystemen durch Elektropolieren mit Hilfe bewegter Elektroden, dadurch gekennzeichnet, daß man den Elektrolyten mittels Hochdruck von ca. 50 bar oder mehr auf ein Teilstück der Wandung des Leitungssystemes aufbringt, und daß man die Kathode mit Hilfe des Hochdruckstrahls im Leitungssystem bewegt.1. A method for cleaning the inner walls of metallic line systems by electropolishing with the help of moving electrodes, characterized in that the electrolyte is applied by means of high pressure of about 50 bar or more to a section of the wall of the line system, and that the cathode is used with the High pressure jet in the pipe system moves. 2. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, gekennzeichnet durch einen elastischen Hochdruckschlauch (5) mit einem metallischen,als Stromleiter dienenden Stabilisierungselement (6a) oder mit einer metallischen, als Stromleiter dienenden Litze (6b), der an seinem Ende (7) mit einer Hochdruckdüse (9) mit mehreren radial und winkelig zur Innenwand (2) des Leitungssystems (1) angeordneten Öffnungen (10) versehen ist,und durch eine elastische, metallische, um das Endstück (8) des Hochdruckschlauches (5) angeordnete und mit dem Stromleiter (6) verbundene Elektrode (4), sowie durch mehrere, zumindest im Elektrodenbereich fest oder verschiebbar auf dem Hochdruckschlauch (5) angeordnete, isolierende Abstandshalter (11, 12).2. Device for carrying out the method according to claim 1, characterized by an elastic high-pressure hose (5) with a metallic stabilizing element (6a) serving as a current conductor or with a metallic strand (6b) serving as a current conductor, which at its end (7) is provided with a high-pressure nozzle (9) with a plurality of openings (10) arranged radially and at an angle to the inner wall (2) of the line system (1), and through an elastic, metallic one, arranged around the end piece (8) of the high-pressure hose (5) and with electrode (4) connected to the current conductor (6), and by means of a plurality of insulating spacers (11, 12) which are arranged at least firmly or displaceably on the high-pressure hose (5) in the electrode area. 3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Elektrode als spiralförmige Kathode (4) ausgebildet ist.3. Apparatus according to claim 2, characterized in that the electrode is designed as a spiral cathode (4). 4. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Elektrode (4) als gewendeltes Band ausgebildet ist.4. The device according to claim 2, characterized in that the electrode (4) is designed as a coiled ribbon. 5. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß am Kopf der Hochdruckdüse (9) eine elastische Kappe (13) und an dem der Düse abgewandten Ende der Elektrode ein Abstandshalter (12) mit einer um den Faktor größer als 1 größeren Fläche als jeweils derjenigen der (des) Abstandshalter(s) (11) innerhalb des Elektrodenbereiches, jedoch kleineren Fläche, als dem kleinsten zu durchfahrenden Querschnitt des Leitungssystems (1) entspricht, vorgesehen ist.5. The device according to claim 2, characterized in that at the head of the high-pressure nozzle (9) an elastic cap (13) and at the end of the electrode facing away from the electrode, a spacer (12) with a greater than 1 larger area than each that of the spacer (s) (11) is provided within the electrode area, but has a smaller area than the smallest cross section of the line system (1) to be traversed.
EP82104945A 1981-09-12 1982-06-05 Method and apparatus for cleaning the inner walls of metallic tubular systems by electropolishing by means of moving electrodes Expired EP0074463B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3136187 1981-09-12
DE3136187A DE3136187C2 (en) 1981-09-12 1981-09-12 Method and device for cleaning the inner walls of metallic pipe systems by electropolishing with the aid of moving electrodes

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EP0074463A1 true EP0074463A1 (en) 1983-03-23
EP0074463B1 EP0074463B1 (en) 1985-08-07

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JP (1) JPS5855600A (en)
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EP0146833A2 (en) * 1983-12-14 1985-07-03 Siemens Aktiengesellschaft Apparatus for electropolishing the inner surfaces of hollow cylindrical objects
EP0180892A1 (en) * 1984-11-09 1986-05-14 Siemens Aktiengesellschaft Apparatus for electropolishing the inner surfaces of tubes
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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0144036A2 (en) * 1983-11-30 1985-06-12 Siemens Aktiengesellschaft Process for decontaminating metallic components of a nuclear plant
EP0144036A3 (en) * 1983-11-30 1985-07-17 Kraftwerk Union Aktiengesellschaft Process for decontaminating metallic components of a nuclear plant
EP0146833A2 (en) * 1983-12-14 1985-07-03 Siemens Aktiengesellschaft Apparatus for electropolishing the inner surfaces of hollow cylindrical objects
US4634511A (en) * 1983-12-14 1987-01-06 Kraftwerk Union Aktiengesellschaft Device for electropolishing the inner surface of hollow cylindrical bodies
EP0146833A3 (en) * 1983-12-14 1987-05-13 Kraftwerk Union Aktiengesellschaft Apparatus for electropolishing the inner surfaces of hollow cylindrical objects
EP0180892A1 (en) * 1984-11-09 1986-05-14 Siemens Aktiengesellschaft Apparatus for electropolishing the inner surfaces of tubes
EP0249552A1 (en) * 1986-06-10 1987-12-16 Cation Corporation Electrochemical rifling of gun barrels
WO1998022953A1 (en) * 1996-11-15 1998-05-28 Babcock Rosyth Defence Limited Reducing radionuclide surface contamination of a metallic component
FR2886560A1 (en) * 2005-06-03 2006-12-08 Commissariat Energie Atomique Tube unblocking device, useful e.g. in the nuclear industry, comprises electric current impulse generator connected to elongated electrode in insulating sheath, forming impulses to disintegrate blockages
US20130233724A1 (en) * 2012-03-08 2013-09-12 Hon Hai Precision Industry Co., Ltd. System and method of electrolytic deburring for metal pieces
DE102016114969A1 (en) * 2016-06-21 2017-12-21 Extrude Hone Gmbh Method and apparatus for electrolytic polishing and method for producing a cathode
WO2017220633A1 (en) * 2016-06-21 2017-12-28 Extrude Hone Gmbh Electrolytic polishing method and device and method for producing a cathode
DE102016114969B4 (en) 2016-06-21 2019-05-09 Extrude Hone Gmbh Method and apparatus for electrolytic polishing

Also Published As

Publication number Publication date
EP0074463B1 (en) 1985-08-07
DE3136187A1 (en) 1983-04-28
DE3136187C2 (en) 1988-08-18
JPS6157920B2 (en) 1986-12-09
JPS5855600A (en) 1983-04-01

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