EP0685574A2 - Process for the preparation of the coating process of activable or reactivable electrodes for electrolytic applications - Google Patents
Process for the preparation of the coating process of activable or reactivable electrodes for electrolytic applications Download PDFInfo
- Publication number
- EP0685574A2 EP0685574A2 EP95106891A EP95106891A EP0685574A2 EP 0685574 A2 EP0685574 A2 EP 0685574A2 EP 95106891 A EP95106891 A EP 95106891A EP 95106891 A EP95106891 A EP 95106891A EP 0685574 A2 EP0685574 A2 EP 0685574A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- electrode
- jet
- electrodes
- pressure
- 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
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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
Definitions
- the invention relates to a method for preparing the coating processes of activatable or reactivatable electrodes for electrolytic purposes, in particular dimensionally stable electrodes based on valve metal, whereby foreign substances or adhering parts of a coating on the electrode surface to be coated are removed by abrasion by means of a jet of a fluid hitting the surface.
- EP-PS 063 540 Methods for activating and reactivating electrodes are known from EP-PS 063 540, which includes, among other things, pickling, sandblasting and mechanical roughening of the surface.
- Hardening the surface during sandblasting can lead to a considerable distortion of the anode structure with a corresponding loss of the geometric basic structure of the electrode, e.g. their flatness or hollow cylindrical surfaces come, which must then be reinstalled with mechanical or thermal straightening.
- the object of the invention is to create an enlarged surface, to remove any firmly adhering local contaminants or residual coatings and passive layers and, if appropriate, to roughen the surface for the coating process.
- the electrode substrate and already existing microstructures or roughness applied in the interior of the substrate should be retained.
- a major advantage is the fact that minimal changes in the pressure and nozzle system make it possible to cut already coated anodes without heat input, which could lead to deactivation and deterioration of the quality of the electrode in the edge area.
- the first example is an electrode for electrolytic cells, in particular for mercury-chlor-alkali electrolytic cells, which is provided with a large number of activated electrode parts made of flat profiles, as is known, for example, from DE-PS 29 49 495 or US Pat. No.
- the area of the electrode parts selected for pretreatment is aligned by means of a positioning device to the nozzle of a high-pressure water jet device, which is also located in a positioning device, in such a way that the water jet striking at a pressure in the range from 1000 to 4000 bar meanders the surface of the activatable electrode parts to be treated or zigzag-swept;
- a positioning device to the nozzle of a high-pressure water jet device, which is also located in a positioning device, in such a way that the water jet striking at a pressure in the range from 1000 to 4000 bar meanders the surface of the activatable electrode parts to be treated or zigzag-swept;
- Such positioning of high-pressure water jet nozzles is described in the aforementioned DE-OS 40 32 862; the outlet of the high-pressure water jet is adjusted in the angle of the geometry of the workpiece, but usually perpendicular to the surface of the electrode parts to be treated, with usual water from the water supply network in the room temperature range being sufficient.
- the radially or hollow-cylindrical electrodes 1 of their concave surface 2, which are shown in detail, are treated by means of a high-pressure water jet 3, which emerges from the nozzle 4 of a high-pressure device (not shown here); the nozzle 4 is rotated in a meandering or zigzag fashion along the feed direction denoted by number 5, the angle between the emerging high-pressure water jet and the treated surface element of the electrode 1 being in the range from 10 to 90 ° C .; the high-pressure water jet 3 preferably strikes the respective surface element of the electrode 1; the pressure of the high pressure fluid jet is 2000 to 3500 bar.
- the rotating nozzle head can accommodate up to 8 individual nozzles at a speed of 10 to 4000 min ⁇ 1.
- the distance between nozzle and workpiece is 5 to 100 mm, preferably 12 mm, offset 1 mm.
- the high-pressure water jet is guided as a flat jet 3 radially to the surface 2 of the electrode 1 by means of a flat jet nozzle 8.
- groove shades 7, which are favorable in terms of flow technology, are visible on the electrode side and extend in the tangential direction along the concave surface of the electrode 1.
- the pressure is 2000 to 3500 bar, the distance between the nozzle and anode surface is 12 mm, the offset is 1 mm.
- the geometry of a flat electrode structure is shown in sections. Analogous to the feed direction 5, offset of the nozzle jet results in overlapping tracks 9 which are subdivided into microscopic overlapping transverse grooves 10; the surface enlargement achieved proves to be particularly advantageous.
- the more or less fissured, but in any case inclusion-free and clean surface topography created by the variation of pressure, distance, nozzle and feed is suitable as a pretreatment stage for the roll plating of platinum foils on titanium substrates for anodes used for the production of peroxodisulfate and also as a pretreatment stage for a metallic connection of Cu with Ti, steel with titanium, Al with Ti, Cu with Ti using the extrusion process.
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Vorbereitung der Beschichtungprozesse von aktivierbaren 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 activatable or reactivatable electrodes for electrolytic purposes, in particular dimensionally stable electrodes based on valve metal, whereby foreign substances or adhering parts of a coating on the electrode surface to be coated are removed by abrasion by means of a jet of a fluid hitting the surface.
Aus der EP-PS 063 540 sind Verfahren zur Aktivierung und Reaktivierung von Elektroden bekannt, wozu unter anderem Beizen, Sandstrahlen und mechanische Aufrauhung der Oberfläche gehören.Methods for activating and reactivating electrodes are known from EP-PS 063 540, which includes, among other things, pickling, sandblasting and mechanical roughening of the surface.
Diese Vorbehandlungen dienen:
- a) zur Reinigung und
- b) zur Beschaffung einer geeigneten Oberfläche bezüglich der Haftung der Beschichtung.
- a) for cleaning and
- b) to obtain a suitable surface with regard to the adhesion of the coating.
Weiterhin ist aus DE 40 32 862 A1 ein Verfahren zur Vorbehandlung metallischer Oberflächen für thermische Spritzbeschichtungen bekannt, bei dem auf eine Bauteiloberfläche ein ständiger Wassertropfen-Strahl mit einem Druck von 2500 bis 3500 bar als gesteuerte Erosion auftrifft; zur Verstärkung des erosiven Effektes können dem Wasser feste Partikel als Zusätze beigemischt werden.Furthermore, from DE 40 32 862 A1 a method for the pretreatment of metallic surfaces for thermal spray coatings is known, in which a constant water drop jet with a pressure of 2500 to 3500 bar hits a component surface as controlled erosion; To increase the erosive effect, solid particles can be added to the water.
Die bekannten Verfahren bringen folgende ökonomische, ökologische oder technische Probleme mit sich:The known processes involve the following economic, ecological or technical problems:
Durch Aufhärten der Oberfläche beim Sandstrahlen kann es zu einem erheblichen Verzug der Anodenstruktur mit entsprechendem Verlust der geometrischen Grundstruktur der Elektrode, wie z.B. ihrer Ebenheit oder hohlzylindrisch gebogener Oberflächen kommen, die anschließend mit mechanischem oder thermischem Richten wieder eingebracht werden muß.Hardening the surface during sandblasting can lead to a considerable distortion of the anode structure with a corresponding loss of the geometric basic structure of the electrode, e.g. their flatness or hollow cylindrical surfaces come, which must then be reinstalled with mechanical or thermal straightening.
Beizen oder Strahlen kann zu einem erheblichen Abtrag des Substrates führen. Es fallen normalerweise große Mengen von belasteter Altsäure oder Strahlmittel an. Die Rückgewinnung von Edelmetall aus diesen Altsäurelösungen ist normalerweise nicht wirtschaftlich. Die Aufrauhung der Oberfläche beim mechanischen Bürsten bringt die Gefahr von Einschließungen des Bürstenmaterials in die Oberfläche mit sich, die anschließend während des Betriebes die Qualität der Anoden stark beeinflussen kann. Die durch Bürsten erreichte Oberflächentopographie eignet sich nur bedingt für eine nachfolgende Beschichtung.Pickling or blasting can lead to considerable removal of the substrate. There is usually a large amount of contaminated waste acid or blasting media. The recovery of precious metal from these waste acid solutions is usually not economical. The roughening of the surface during mechanical brushing entails the risk of the brush material being enclosed in the surface, which can subsequently have a strong influence on the quality of the anodes during operation. The surface topography achieved by brushing is only of limited suitability for subsequent coating.
Eine strömungstechnisch ideale Anordnung von Strömungsbahnen ist praktisch mittels Sandstrahlen nicht zu erzeugen.A flow-technically ideal arrangement of flow paths cannot be created practically by means of sandblasting.
Die Erfindung stellt sich die Aufgabe, eine vergrößerte Oberfläche zu schaffen, eventuell fest haftende lokale Verunreinigungen, 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 Mikro-Strukturen oder Rauhigkeiten im ungünstigsten Fall erhalten bleiben.The object of the invention is to create an enlarged surface, to remove any firmly adhering local contaminants or residual coatings and passive layers and, if appropriate, to roughen the surface for the coating process. In the worst case, the electrode substrate and already existing microstructures or roughness applied in the interior of the substrate should be retained.
Nachfolgend wird auf Basis des abgetragenen Gemisches aus Edelmetall und Verunreinigungen ein Recycling der abgetragenen Edelmetall möglich.In the following, recycling of the removed precious metal is possible on the basis of the removed mixture of precious metal and impurities.
Die Erfindung wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.The invention is solved by the characterizing features of
Ein wesentlicher Vorteil ist darin zu sehen, daß durch minimale Veränderungen im Druck und Düsensystem, die Möglichkeit besteht, bereits beschichtete Anoden zu schneiden ohne Wärmeeintrag, der zu einer Deaktivierung und Verschlechterung der Qualität der Elektrode im Randbereich führen könnte.A major advantage is the fact that minimal changes in the pressure and nozzle system make it possible to cut already coated anodes without heat input, which could lead to deactivation and deterioration of the quality of the electrode in the edge area.
Weitere vorteilhafte Ausgestaltungen des Verfahrens sind in den Ansprüchen 2 bis 7 angegeben.Further advantageous refinements of the method are specified in
Die Erfindung wird nachstehend anhand von vier Ausführungsbeispielen näher erläutert.The invention is explained in more detail below using four exemplary embodiments.
Als erstes Beispiel dient eine Elektrode für Elektrolysezellen, insbesondere für Quecksilber-Chloralkali-Elektrolysezellen, die mit einer Vielzahl von aktivierten Elektrodenteilen aus Flachprofilen versehen 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 Positioniervorrichtung so zu der ebenfalls in einer Positioniervorrichtung befindlichen Düse eines Hochdruck-Wasserstrahlgerätes ausgerichtet, daß der mit einem Druck im Bereich von 1000 bis 4000 bar auftreffende Wasserstrahl die Fläche der zu behandelnden aktivierbaren Elektrodenteile mäanderförmig bzw. zickzackförmig überstreicht; eine solche Positionierung von Hochdruck-Wasserstrahl-Düsen ist in der eingangs erwähnten DE-OS 40 32 862 beschrieben; der Austritt des Hochdruck-Wasserstrahls ist im Winkel der Gemoetrie des Werkstückes angepaßt, meist jedoch lotrecht zur Oberfläche der zu behandelnden Elektrodenteile, wobei übliches aus dem Wasserleitungsnetz zur Verfügung gestelltes Wasser im Raumtemperaturbereich ausreichend ist. Der Hochdruck-Wasserstrahl wird dabei solange über die zu behandelnde Fläche der zu aktivierenden Elektrodenelemente geführt, bis die Beseitigung der vorherigen Beschichtung bzw. die gewünschte Oberflächenrauhigkeit im Bereich der zu beschichtenden Elektrodenteile erreicht ist.The first example is an electrode for electrolytic cells, in particular for mercury-chlor-alkali electrolytic cells, which is provided with a large number of activated electrode parts made of flat profiles, as is known, for example, from DE-PS 29 49 495 or US Pat. No. 43 64 811; the area of the electrode parts selected for pretreatment is aligned by means of a positioning device to the nozzle of a high-pressure water jet device, which is also located in a positioning device, in such a way that the water jet striking at a pressure in the range from 1000 to 4000 bar meanders the surface of the activatable electrode parts to be treated or zigzag-swept; Such positioning of high-pressure water jet nozzles is described in the aforementioned DE-OS 40 32 862; the outlet of the high-pressure water jet is adjusted in the angle of the geometry of the workpiece, but usually perpendicular to the surface of the electrode parts to be treated, with usual water from the water supply network in the room temperature range being sufficient. The high-pressure water jet is guided over the surface of the electrode elements to be activated until the removal of the previous coating or the desired surface roughness in the area of the electrode parts to be coated is achieved.
Weitere Ausführungsbeispiele sind anhand der Figuren 1 bis 3 näher erläutert.
Figur 1 zeigt schematisch die Behandlung anhand eines Ausschnitts eines konkav hohlzylindrisch gebogenen Anodensegments für die Stahlbandverzinkung mittels zickzack- bzw. mäanderförmig geführten Hochdruck-Wasserstrahls.- In
Figur 2 ist die Behandlung anhand eines Ausschnitts einer konkav gebogenen Anode für die Stahlbandverzinkung schematisch dargestellt, wobei der Hochdruck-Wasserstrahl in tangentialer Richtung entlang der inneren hohlzylindrischen Fläche geführt wird. Figur 3 zeigt schematisch im Ausschnitt die Oberflächenstruktur einer ebenen Elektrode nach ihrer Behandlung mittels Hochdruck-Wasserstrahl.
- Figure 1 shows schematically the treatment based on a section of a concave hollow cylindrical anode segment for the steel strip galvanizing by means of zigzag or meandering high-pressure water jet.
- In FIG. 2, the treatment is shown schematically on the basis of a section of a concavely curved anode for the steel strip galvanizing, the high-pressure water jet being guided in a tangential direction along the inner hollow cylindrical surface.
- FIG. 3 shows a schematic detail of the surface structure of a flat electrode after its treatment by means of a high-pressure water jet.
Gemäß Figur 1 werden die ausschnittsweise dargestellten radial-, bzw. hohlzylindrisch gebogenen Elektroden 1 ihrer konkav ausgebildeten Oberfläche 2 mittels eines Hochdruck-Wasserstrahls 3 behandelt, welcher aus der Düse 4 einer hier nicht näher dargestellten Hochdruck-Vorrichtung austritt; die Düse 4 wird rotatorisch längs der mit Ziffer 5 bezeichneten Vorschubrichtung mäanderförmig, bzw. zickzackförmig bewegt, wobei der Winkel zwischen dem austretenden Hochdruck-Wasserstrahl und dem behandelten Flächenelement der Elektrode 1 im Bereich von 10 bis 90° C liegt; vorzugsweise trifft der Hochdruck-Wasserstrahl 3 lotrecht auf das jeweilige Flächenelement der Elektrode 1; der Druck des Hochdruck-Fluidstrahls beträgt 2000 bis 3500 bar. Der rotatorisch bewegte Düsenkopf kann bis zu 8 Einzeldüsen aufnehmen bei einer Drehzahl von 10 bis 4000 min⁻¹. Der Abstand Düse zu Werkstück beträgt 5 bis 100 mm, vorzugsweise 12 mm, Versatz 1 mm.According to FIG. 1, the radially or hollow-
Durch den auftreffenden Hochdruck-Wasserstrahl 3 bilden sich strömungstechnisch günstige elektrodenseitig sichbare Rillenschattierungen, unterschiedlicher Winkel ab, die mit Bezugsziffer 6 bezeichnet sind.Due to the impinging high-
In einem weiteren Ausführungsbeispiel gemäß Figur 2 wird der Hochdruck-Wasserstrahl als Flachstrahl 3 mittels einer Flachstrahldüse 8 radial zur Oberfläche 2 der Elektrode 1 geführt. Analog entstehen strömungstechnisch günstige elektrodenseitig sichtbare Rillenschattierungen 7, die sich in tangentialer Richtung entlang der konkaven Oberfläche der Elektrode 1 erstrecken. Der Druck liegt bei 2000 bis 3500 bar, Abstand Düse-Anodenoberfläche bei 12 mm, der Versatz bei 1 mm.In a further exemplary embodiment according to FIG. 2, the high-pressure water jet is guided as a
In einem weiteren Ausführungsbeispiel gemäß Figur 3 ist ausschnittsweise die Geometrie einer ebenen Elektrodenstruktur dargestellt. Analog zur Vorschubrichtung 5 entstehen durch Versatz des Düsenstrahls sich überlappende Bahnen 9, die unterteilt sind in mikroskopisch kleine sich überlappende Querrillen 10; als besonders vorteilhaft erweist sich die erzielte Oberflächenvergrößerung. Die durch die Variation von Druck, Abstand, Düse und Vorschub entstehende mehr oder gering zerklüftete, in jedem Fall aber einschlußfreie und saubere Oberflächentopografie eignet sich als Vorbehandlungsstufe zum Walzplattieren von Platin-Folien auf Titan-Substrat für Anoden eingesetzt zur Peroxodisulfatherstellung sowie auch als Vorbehandlungsstufe für eine metallische Verbindung von Cu- mit Ti, Stahl mit Titan, Al mit Ti, Cu mit Ti mittels dem Strangpreßverfahren.In a further exemplary embodiment according to FIG. 3, the geometry of a flat electrode structure is shown in sections. Analogous to the
Weiterhin ist es durch Einsatz von Hochdruck-Wasserstrahlen mit Abrasivzusatz möglich, Rillenstrukturen von gezielt eingebrachten quer- oder längs oder kreuzförmig angeordneten Bahnen geringer Tiefe in das elektrodenseitige Substrat einzufräsen, die in der Praxis den Gastransport und Massentransport während der Elektrolyse steuern.Furthermore, by using high-pressure water jets with an abrasive additive, it is possible to mill groove structures of deliberately introduced transverse or longitudinal or cross-shaped tracks of shallow depth into the electrode-side substrate, which in practice control the gas transport and mass transport during the electrolysis.
Claims (4)
dadurch gekennzeichnet, daß ein Hochdruck-Fluidstrahl mit einem Druck im Bereich von 1000 bis 4000 bar aus einer Düse im Winkel zwischen 10 bis 90° auf die zu beschichtende Elektroden-Oberfläche auftrifft.Process for preparing the coating process of activatable or reactivatable 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 fluid jet with a pressure in the range of 1000 to 4000 bar hits the electrode surface to be coated from a nozzle at an angle of between 10 and 90 °.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4419276 | 1994-06-01 | ||
| DE4419276A DE4419276A1 (en) | 1994-06-01 | 1994-06-01 | Process for preparing the coating process of activatable or reactivatable electrodes for electrolytic purposes |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0685574A2 true EP0685574A2 (en) | 1995-12-06 |
| EP0685574A3 EP0685574A3 (en) | 1996-01-03 |
| EP0685574B1 EP0685574B1 (en) | 1998-07-01 |
Family
ID=6519606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95106891A Expired - Lifetime EP0685574B1 (en) | 1994-06-01 | 1995-05-06 | Process for the preparation of the coating process of reactivatable electrodes for electrolytic applications |
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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1162288A1 (en) * | 2000-06-09 | 2001-12-12 | De Nora Elettrodi S.P.A. | Electrode characterized by highly adhering superficial catalytic layer |
| EP1304395A1 (en) * | 2001-10-19 | 2003-04-23 | Sulzer Markets and Technology AG | Process for producing a thermally sprayed layer |
Families Citing this family (2)
| 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 |
| 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5118937A (en) * | 1974-08-07 | 1976-02-14 | Kobe Steel Ltd | Chitanzaino hyomenshorihoho |
| 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 |
| EP0576402A1 (en) * | 1992-06-25 | 1993-12-29 | Eltech Systems Corporation | Electrodes of improved service life |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5584957A (en) * | 1978-12-13 | 1980-06-26 | Konishiroku Photo Ind Co Ltd | Electrophotographic copier which permit combined copying with electric signal image |
| DE2949495C2 (en) * | 1979-12-08 | 1983-05-11 | Heraeus-Elektroden Gmbh, 6450 Hanau | Electrode for electrolytic cells |
| DE3270207D1 (en) * | 1981-04-06 | 1986-05-07 | Eltech Systems Corp | Recoating of electrodes |
| 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 |
| JPH05169130A (en) * | 1991-12-24 | 1993-07-09 | Nippon Steel Corp | Method and device for eliminating scale of metallic stock |
-
1994
- 1994-06-01 DE DE4419276A patent/DE4419276A1/en not_active Ceased
-
1995
- 1995-05-06 AT AT95106891T patent/ATE167901T1/en not_active IP Right Cessation
- 1995-05-06 EP EP95106891A patent/EP0685574B1/en not_active Expired - Lifetime
- 1995-05-06 DE DE59502673T patent/DE59502673D1/en not_active Expired - Fee Related
- 1995-05-06 ES ES95106891T patent/ES2120103T3/en not_active Expired - Lifetime
- 1995-05-30 JP JP7132114A patent/JPH07331477A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5118937A (en) * | 1974-08-07 | 1976-02-14 | Kobe Steel Ltd | Chitanzaino hyomenshorihoho |
| 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 |
| EP0576402A1 (en) * | 1992-06-25 | 1993-12-29 | Eltech Systems Corporation | Electrodes of improved service life |
Non-Patent Citations (1)
| Title |
|---|
| DATABASE WPI Week 7613 Derwent Publications Ltd., London, GB; AN 76-23653X & JP-A-51 018 937 (KOBE STEEL KK) , 14.Februar 1976 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1162288A1 (en) * | 2000-06-09 | 2001-12-12 | De Nora Elettrodi S.P.A. | Electrode characterized by highly adhering superficial catalytic layer |
| EP1304395A1 (en) * | 2001-10-19 | 2003-04-23 | Sulzer Markets and Technology AG | Process for producing a thermally sprayed layer |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0685574B1 (en) | 1998-07-01 |
| EP0685574A3 (en) | 1996-01-03 |
| DE4419276A1 (en) | 1995-12-07 |
| DE59502673D1 (en) | 1998-08-06 |
| ATE167901T1 (en) | 1998-07-15 |
| JPH07331477A (en) | 1995-12-19 |
| ES2120103T3 (en) | 1998-10-16 |
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