DE4419276A1 - Process for preparing the coating process of activatable or reactivatable electrodes for electrolytic purposes - Google Patents

Process for preparing the coating process of activatable or reactivatable electrodes for electrolytic purposes

Info

Publication number
DE4419276A1
DE4419276A1 DE4419276A DE4419276A DE4419276A1 DE 4419276 A1 DE4419276 A1 DE 4419276A1 DE 4419276 A DE4419276 A DE 4419276A DE 4419276 A DE4419276 A DE 4419276A DE 4419276 A1 DE4419276 A1 DE 4419276A1
Authority
DE
Germany
Prior art keywords
coating
electrodes
activatable
preparing
reactivatable
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.)
Ceased
Application number
DE4419276A
Other languages
German (de)
Inventor
Gerhard Dehm
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.)
De Nora Deutschland GmbH
Original Assignee
Heraeus Elektrochemie 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 Heraeus Elektrochemie GmbH filed Critical Heraeus Elektrochemie GmbH
Priority to DE4419276A priority Critical patent/DE4419276A1/en
Priority to AT95106891T priority patent/ATE167901T1/en
Priority to DE59502673T priority patent/DE59502673D1/en
Priority to EP95106891A priority patent/EP0685574B1/en
Priority to ES95106891T priority patent/ES2120103T3/en
Priority to JP7132114A priority patent/JPH07331477A/en
Publication of DE4419276A1 publication Critical patent/DE4419276A1/en
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00—Electrodes; Manufacture thereof not otherwise provided for

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Electrochemistry (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Paints Or Removers (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

A metal surface is prepared by erosion, being blasted by means of a high pressure fluid jet. The metal, after coating with a further metal layer, will become an electrode of high dimensional stability, to be used in electrolytic processes. The outer surface is reactive, or can be activated. The impact of the jet removes foreign matter and any clinging remains of a previous coating, thanks to its high pressure, 1000 to 4000 bar, directed from a nozzle and impinging on the surface at an angle between 10 to 90 degrees .

Description

Die Erfindung betrifft ein Verfahren zur Vorbereitung der Beschichtungsprozesse von aktivierba­ ren oder reaktivierbaren Elektroden für elektrolytische Zwecke, insbesondere dimensionsstabile Elektroden auf Ventilmetallbasis, wobei auf der zu beschichtenden Elektrodenoberfläche Fremdstoffe oder anhaftende Teile einer Beschichtung durch Abrasion mittels eines auf die Oberfläche treffenden Strahls eines Fluids entfernt werden.The invention relates to a method for preparing the coating processes of aktivierba Ren or reactivatable electrodes for electrolytic purposes, especially dimensionally stable Valve metal-based electrodes, on the electrode surface to be coated Foreign matter or adhering parts of a coating due to abrasion by means of a Surface of the jet of a fluid to be struck.

Aus der EP-PS 063 540 sind Verfahren zur Aktivierung und Reaktivierung von Elektroden be­ kannt, wozu unter anderem Beizen, Sandstrahlen und mechanische Aufrauhung der Oberfläche gehören.Methods for activating and reactivating electrodes are known from EP-PS 063 540 knows, among other things, pickling, sandblasting and mechanical roughening of the surface belong.

Diese Vorbehandlungen dienen:These pretreatments serve:

  • a) zur Reinigung unda) for cleaning and
  • b) zur Beschaffung einer geeigneten Oberfläche bezüglich der Haftung der Beschichtung.b) to obtain a suitable surface with regard to the adhesion of the coating.

Die bekannten Verfahren bringen folgende ökonomische, ökologische oder technische Proble­ me mit sich:The known processes have the following economic, ecological or technical problems me with myself:

Sandstrahlen kann zu einem erheblichen Verziehen der Anodenstruktur mit entsprechendem Verlust von Ebenheit führen, die anschließend mit mechanischem oder thermischem Richten wieder eingebracht werden muß. Sandblasting can cause considerable distortion of the anode structure with the corresponding Loss of flatness result, followed by mechanical or thermal straightening must be reintroduced.  

Beizen oder Strahlen kann zu einem erheblichen Abtrag des Substrates führen. Es fallen nor­ malerweise große Mengen von belasteter Altsäure oder Strahlmittel an. Die Rückgewinnung von Edelmetall aus diesen Altsäurelösungen ist normalerweise nicht wirtschaftlich. Die Aufrau­ hung der Oberfläche beim mechanischen Bürsten bringt die Gefahr von Einschließungen des Bürstenmaterials in die Oberfläche mit sich, die anschließend während des Betriebes die Quali­ tät der Anoden stark beeinflussen kann.Pickling or blasting can lead to considerable removal of the substrate. There are no sometimes large amounts of contaminated waste acid or abrasive. The recovery Precious metal from these waste acid solutions is usually not economical. The roughening The surface of mechanical brushing entails the risk of inclusion of the Brush material in the surface with it, which subsequently qualifies during operation the anodes can strongly influence.

Die Erfindung stellt sich die Aufgabe, eine vergrößerte Oberfläche zu schaffen, eventuell Verun­ reinigungen, bzw. Restbeschichtungen sowie Passivschichten zu entfernen und gegebenenfalls die Oberfläche für den Beschichtungsprozeß aufzurauhen. Dabei soll das Elektrodensubstrat sowie im Inneren des Substrats aufgebrachte schon vorhandene Strukturen oder Rauhigkeiten geschont werden.The object of the invention is to create an enlarged surface, possibly Verun cleaning, or to remove residual coatings and passive layers and, if necessary roughen the surface for the coating process. The electrode substrate as well as existing structures or roughness applied inside the substrate be spared.

Die Erfindung wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.The invention is solved by the characterizing features of claim 1.

Ein wesentlicher Vorteil ist darin zu sehen, daß es mittels eines stark fokussiert und mit sehr ho­ hem Druck gepumpten Wasserstrahles möglich ist, eventuelle Restbeschichtungen von Anoden restlos zu entfernen, eine bereits vorher aufgerauhte Oberfläche noch stärker aufzurauhen; mit der richtigen Einstellung von Druck und Abstand zwischen Düse und Elektrodenstruktur ist es möglich, die Restbeschichtung restlos zu entfernen bei gleichzeitiger Verschonung der Oberflächenrauhigkeit.A major advantage can be seen in the fact that it is highly focused and very high Hem pressure pumped water jet is possible, possible residual coatings of anodes to be removed completely, to roughen a previously roughened surface even more; With it is the correct setting of pressure and distance between nozzle and electrode structure possible to completely remove the remaining coating while protecting the Surface roughness.

Ein zusätzlicher Vorteil ist darin zu sehen, daß durch minimale Veränderungen im Druck- und Düsensystem, die Möglichkeit besteht, bereits beschichtete Anoden zu schneiden ohne Wär­ meeintrag, der zu einer Deaktivierung und Verschlechterung der Qualität führen könnte.An additional advantage is the fact that minimal changes in printing and Nozzle system, it is possible to cut already coated anodes without heating entry that could lead to deactivation and deterioration in quality.

Weitere vorteilhafte Ausgestaltungen des Verfahrens sind in den Ansprüchen 2 bis 4 angegeben.Further advantageous embodiments of the method are in claims 2 to 4 specified.

Die Erfindung wird nachstehend an einem Ausführungsbeispiel näher erläutert.The invention is explained in more detail below using an exemplary embodiment.

Als Beispiel dient eine Elektrode für Elektrolysezellen, insbesondere für Quecksilber-Chloralkali- Elektrolysezellen die mit einer Vielzahl von aktivierten Elektrodenteilen aus Flachprofilen verse­ hen ist, wie sie beispielsweise aus der DE-PS 29 49 495 oder US-PS 43 64 811 bekannt ist; der zur Vorbehandlung ausgewählte Bereich der Elektrodenteile wird mittels einer Positionier­ vorrichtung so zu der ebenfalls in einer Positioniervorrichtung befindlichen Düse eines Hochdruck-Wasserstrahlgerätes ausgerichtet, daß der mit einem Druck im Bereich von 2000 bis 4000 bar auftreffende Wasserstrahl die Fläche der zu behandelnden aktivierbaren Elektro­ denteile mäanderförmig bzw. zickzackförmig überstreicht; eine solche Positionierung von Hoch­ druck-Wasserstrahl-Düsen ist in der DE-OS 40 32 862 beschrieben; der Austritt des Hoch­ druck-Wasserstrahls aus der Düse erfolgt in einem Winkel von 10 bis 90° zur Oberfläche der zu behandelnden Elektrodenteile, wobei übliches aus dem Wasserleitungsnetz zur Verfügung ge­ stelltes Wasser im Raumtemperaturbereich ausreichend ist; der Hochdruck-Wasserstrahl wird dabei solange über die zu behandelnde Fläche der zu aktivierenden Elektrodenelemente ge­ führt, bis die Beseitigung der vorherigen Beschichtung bzw. die gewünschte Oberflächenrauhig­ keit im Bereich der zu beschichtenden Elektrodenteile erreicht ist.An electrode for electrolysis cells, in particular for mercury-chloroalkali Electrolysis cells with a variety of activated electrode parts made of flat profiles hen is, as is known for example from DE-PS 29 49 495 or US-PS 43 64 811; the area of the electrode parts selected for pretreatment is positioned device to the nozzle also located in a positioning device  High-pressure water jet device aligned with a pressure in the range of 2000 up to 4000 bar water jet hitting the surface of the activatable electro to be treated the parts are meandering or zigzag-shaped; such a positioning from high pressure water jet nozzles is described in DE-OS 40 32 862; the exit of the high pressure water jet from the nozzle is at an angle of 10 to 90 ° to the surface of the treating electrode parts, with usual ge available from the water supply network water at room temperature is sufficient; the high pressure water jet will as long as ge over the area to be treated of the electrode elements to be activated leads to the removal of the previous coating or the desired surface roughness speed is reached in the area of the electrode parts to be coated.

Claims (4)

1. Verfahren zur Vorbereitung des Beschichtungsprozesses von aktivierbaren oder reakti­ vierbaren Elektroden für elektrolytische Zwecke, insbesondere dimensionsstabile Elektro­ den auf Ventilmetallbasis, wobei auf der zu beschichtenden Elektrodenoberfläche Fremd­ stoffe oder anhaftende Teile einer Beschichtung durch Abrasion mittels eines auf die Oberfläche treffenden Strahls eines Fluids entfernt werden, dadurch gekennzeichnet, daß ein Hochdruck-Wasserstrahl mit einem Druck im Bereich von 2000 bis 4000 bar aus einer Düse im Winkel von 10 bis 90° auf die zu beschichtende Elektroden-Oberfläche auftrifft.1. A method for preparing the coating process of activatable or reactive electrodes for electrolytic purposes, in particular dimensionally stable electrodes based on valve metal, foreign substances or adhering parts of a coating being removed from the electrode surface by abrasion by means of a jet of a fluid hitting the surface , characterized in that a high-pressure water jet with a pressure in the range from 2000 to 4000 bar hits the electrode surface to be coated from a nozzle at an angle of 10 to 90 °. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Beschichtung ohne Verän­ derung der bestehenden Oberflächenstruktur entfernt wird.2. The method according to claim 1, characterized in that the coating without changes the existing surface structure is removed. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die zu beschichtende Oberflä­ che aufgerauht wird.3. The method according to claim 1, characterized in that the surface to be coated che is roughened. 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Hochdruck-Wasserstrahl auf eine Elektroden-Oberfläche mit einer Anfangsrauhigkeit auftrifft.4. The method according to claim 1, characterized in that the high pressure water jet strikes an electrode surface with an initial roughness.
DE4419276A 1994-06-01 1994-06-01 Process for preparing the coating process of activatable or reactivatable electrodes for electrolytic purposes Ceased DE4419276A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE4419276A DE4419276A1 (en) 1994-06-01 1994-06-01 Process for preparing the coating process of activatable or reactivatable electrodes for electrolytic purposes
AT95106891T ATE167901T1 (en) 1994-06-01 1995-05-06 METHOD FOR PREPARING THE COATING PROCESS OF REACTIVABLE ELECTRODES FOR ELECTROLYTIC PURPOSES
DE59502673T DE59502673D1 (en) 1994-06-01 1995-05-06 Process for preparing the coating process of reactivatable electrodes for electrolytic purposes
EP95106891A EP0685574B1 (en) 1994-06-01 1995-05-06 Process for the preparation of the coating process of reactivatable electrodes for electrolytic applications
ES95106891T ES2120103T3 (en) 1994-06-01 1995-05-06 PROCEDURE FOR THE PREPARATION OF THE COATING PROCESS OF REACTIVABLE ELECTRODES FOR ELECTROLYTIC PURPOSES.
JP7132114A JPH07331477A (en) 1994-06-01 1995-05-30 Method for preparing coating process for electrode which can be activated or reactivated for electrolysis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4419276A DE4419276A1 (en) 1994-06-01 1994-06-01 Process for preparing the coating process of activatable or reactivatable electrodes for electrolytic purposes

Publications (1)

Publication Number Publication Date
DE4419276A1 true DE4419276A1 (en) 1995-12-07

Family

ID=6519606

Family Applications (2)

Application Number Title Priority Date Filing Date
DE4419276A Ceased DE4419276A1 (en) 1994-06-01 1994-06-01 Process for preparing the coating process of activatable or reactivatable electrodes for electrolytic purposes
DE59502673T Expired - Fee Related DE59502673D1 (en) 1994-06-01 1995-05-06 Process for preparing the coating process of reactivatable electrodes for electrolytic purposes

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE59502673T Expired - Fee Related DE59502673D1 (en) 1994-06-01 1995-05-06 Process for preparing the coating process of reactivatable electrodes for electrolytic purposes

Country Status (5)

Country Link
EP (1) EP0685574B1 (en)
JP (1) JPH07331477A (en)
AT (1) ATE167901T1 (en)
DE (2) DE4419276A1 (en)
ES (1) ES2120103T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19634637A1 (en) * 1996-08-27 1997-11-20 Siemens Ag Cleaning components of electron tubes esp. tubes with metallic vacuum housing, e.g. X=ray tubes

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1317969B1 (en) * 2000-06-09 2003-07-21 Nora Elettrodi De ELECTRODE CHARACTERIZED BY A HIGH ADHESION OF A SURFACE CATALYTIC LAYER.
EP1304395A1 (en) * 2001-10-19 2003-04-23 Sulzer Markets and Technology AG Process for producing a thermally sprayed layer
JP4451471B2 (en) * 2006-11-20 2010-04-14 ペルメレック電極株式会社 Method for reactivating electrode for electrolysis

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2949995C2 (en) * 1978-12-13 1982-04-22 Konishiroku Photo Industry Co., Ltd., Tokyo Electrostatic recording device with projection device for originals and recording head for further information signals
US4364811A (en) * 1979-12-08 1982-12-21 Heraeus Elektroden Gmbh Electrodes for electrolytic cells
EP0063540B1 (en) * 1981-04-06 1986-04-02 Eltech Systems Corporation Recoating of electrodes
DE4032862A1 (en) * 1990-10-12 1992-04-16 Bergmann Borsig Gmbh Surface treatment of turbine blades prior to flame spray coating - with high speed water jet to increase coating adhesion
EP0568315A1 (en) * 1992-04-28 1993-11-03 Progressive Technologies, Inc. Apparatus and method for blasting metallic surfaces

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5118937A (en) * 1974-08-07 1976-02-14 Kobe Steel Ltd Chitanzaino hyomenshorihoho
JPS5950195A (en) * 1982-09-14 1984-03-23 Toagosei Chem Ind Co Ltd Regenerating method of cathode
JPS6257710A (en) * 1985-09-06 1987-03-13 Sumitomo Metal Ind Ltd Surface conditioning method for shape steel
JPH02182315A (en) * 1989-01-09 1990-07-17 Sumitomo Metal Ind Ltd Removing method and device for scale of hot rolled steel sheet
US5314601A (en) * 1989-06-30 1994-05-24 Eltech Systems Corporation Electrodes of improved service life
JPH05169130A (en) * 1991-12-24 1993-07-09 Nippon Steel Corp Method and device for eliminating scale of metallic stock

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2949995C2 (en) * 1978-12-13 1982-04-22 Konishiroku Photo Industry Co., Ltd., Tokyo Electrostatic recording device with projection device for originals and recording head for further information signals
US4364811A (en) * 1979-12-08 1982-12-21 Heraeus Elektroden Gmbh Electrodes for electrolytic cells
EP0063540B1 (en) * 1981-04-06 1986-04-02 Eltech Systems Corporation Recoating of electrodes
DE4032862A1 (en) * 1990-10-12 1992-04-16 Bergmann Borsig Gmbh Surface treatment of turbine blades prior to flame spray coating - with high speed water jet to increase coating adhesion
EP0568315A1 (en) * 1992-04-28 1993-11-03 Progressive Technologies, Inc. Apparatus and method for blasting metallic surfaces

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19634637A1 (en) * 1996-08-27 1997-11-20 Siemens Ag Cleaning components of electron tubes esp. tubes with metallic vacuum housing, e.g. X=ray tubes

Also Published As

Publication number Publication date
ATE167901T1 (en) 1998-07-15
EP0685574A3 (en) 1996-01-03
JPH07331477A (en) 1995-12-19
EP0685574A2 (en) 1995-12-06
EP0685574B1 (en) 1998-07-01
ES2120103T3 (en) 1998-10-16
DE59502673D1 (en) 1998-08-06

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