EP0694090B1 - Process and device for the electrolytic surface coating of workpieces - Google Patents
Process and device for the electrolytic surface coating of workpieces Download PDFInfo
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- EP0694090B1 EP0694090B1 EP94905645A EP94905645A EP0694090B1 EP 0694090 B1 EP0694090 B1 EP 0694090B1 EP 94905645 A EP94905645 A EP 94905645A EP 94905645 A EP94905645 A EP 94905645A EP 0694090 B1 EP0694090 B1 EP 0694090B1
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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
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/08—Electroplating with moving electrolyte e.g. jet electroplating
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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
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/06—Filtering particles other than ions
Definitions
- the invention described here relates to a method and a device for the electrolytic surface coating of objects conducting electrical current, in particular metal workpieces, and a special use of the device mentioned.
- Electrolytic surface coatings of metallic objects have long been part of the known prior art; The technology mentioned is widely represented in the patent literature.
- EP-A 0 196 420 (publication date October 8, 1986) teaches a high-speed electrolysis cell for the surface coating of strip-like material.
- Said device comprises a vertical electrolytic galvanizing cell for coating steel strips, in which the strip is guided from an upper deflection or current roller to a lower deflecting immersion roller and from there to a further, upper deflection or current roller.
- the descending and ascending strip section to be coated is acted upon in a gap between vertically arranged anodes by the circulating electrolyte stream at high speed against the strip running direction.
- the circulation of large amounts of electrolyte is achieved using the lowest possible pump energy.
- the electrolysis cell described therein is specified by a plurality of current feeds and a plurality of electrolyte feeds or discharges. This ensures uniform electrolysis and coating.
- the device from DE-A 34 29 890 is used to apply a copper layer to a gravure cylinder in a galvanizing bath, which has a copper-containing electrolyte and at least one anode body made of copper.
- the anode body can have the shape of a plate provided with a plurality of openings, especially that of a perforated or expanded metal plate concentrically arranged around the pressure cylinder. This arrangement allows the electrolysis to be operated at a relatively low voltage and an even copper layer to be applied to the cathodically connected intaglio cylinder.
- the electrolyte is brought up to the anode, through the anode or removed from the anode in such a way that the major part of the anode sludge which forms during the electrolysis is removed from the flowing electrolyte.
- the electrolyte on the circulation is continuously checked with regard to the essential process parameters such as temperature, conversion, contents, etc. and, if necessary, optimized.
- the cathodically connected workpiece is either fixed or it is moved, in particular rotated, during the electrolytic surface coating; the anode is either replaced periodically or the anode material is continuously updated.
- the anode sludge is separated or separated from the electrolyte during its passage through the overflow tank either by settling and / or by electrodes, and / or the sludge particles are retained on a filter switched on in the return device.
- the supply lines or openings for the electrolyte into the anode zone are particularly suitable, the number, arrangement and throughput of which can be varied and optimized.
- Either the bottom of the overflow container is designed as a settling cone with an emptying device - which settling cone can also have deflection plates and / or separating electrodes to improve the degree of separation - and / or it is in the line of the Return conveyor in the flow direction in front of the conveyor unit provided a filter that is cleaned continuously or periodically.
- the cathodically connected object can be a printing cylinder for gravure printing, which is partially immersed in the electrolyte and is fixed or rotatably arranged; the anode parts are then bowl-shaped and arranged at a short distance from the pressure cylinder, the parts may be porous or perforated.
- the feed lines or openings for the electrolyte to the electrolysis zone are those which, in terms of quantity, distribution, direction and speed, permit a technically sufficiently precisely controlled feed of the electrolyte into the zone mentioned.
- Devices for checking and optimizing the main process parameters of the electrolyte such as throughput, temperature, concentrations, etc. are also important.
- the device according to the invention is used primarily for the production of gravure cylinders with a material structure of the surface coating that is free of foreign matter (especially sludge) and therefore finely crystalline, homogeneous and also corrosion-resistant.
- the electrolysis container 1.01 with the electrolyte bath 1.02 is arranged centrally; of course, the actual dimensions of this container correspond to those of the workpiece to be coated.
- the anode or the anode parts 1.03 are set up in accordance with the cathodically connected workpiece 1.04.
- the electrolyte is brought to the corresponding outlet openings 1.06a, 1.06b and 1.07a, 1.07b by means of the two feed lines 1.05a, 1.05b.
- the two outlet openings 1.07a, 1.07b are designed and directed in such a way that a large part of the electrolyte conveyed reaches the bottom between the anode parts 1.03 and the cathodically connected workpiece 1.04 and from there flows up between the electrodes and partly through the anode parts : This is indicated in the figure by the arrows. A smaller part of the electrolyte exits into the electrolyte bath at the openings 1.06a, 1.06 and moves upwards from there on the side of the anode facing away from the cathode. These two directed flows ensure an optimal removal and a sufficiently safe removal of most of the anode sludge that forms when the anode is dissolved.
- the anode sludge emerges from the electrolysis tank into the overflow tanks 1.08a, 1.08b arranged next to the aforementioned tank. So if the electrolyte tank 1.02 is a longer tub, the two connected overflow tanks 1.08a, 1.08b are narrow side tubs. From the overflow tanks 1.08a, 1.08b the liquid electrolyte runs through the lines 1.09a, 1.09b to the delivery units 1.10a, 1.10b, which the medium via the filters 1.11a, 1.11b again through the lines 1.05a, 1.05b to those described above Feed out openings.
- the two overflow containers 1.08a, 1.08b (they can jointly form a peripheral, closed collecting container) can have individual or a coherent settling cone 1.12a, 1.12b with a corresponding drain line at the bottom.
- FIG. 2 shows the corresponding device with the overflow container 2.08 arranged under the electrolysis container 2.01.
- the latter container also has a settling cylinder 2.12 with an emptying line.
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
Description
Die hier beschriebene Erfindung betrifft ein Verfahren sowie eine Vorrichtung zur elektrolytischen Oberflächenbeschichtung von den elektrischen Strom leitenden Gegenständen, insbesondere von Metall-Werkstücken, sowie eine spezielle Verwendung der genannten Vorrichtung.The invention described here relates to a method and a device for the electrolytic surface coating of objects conducting electrical current, in particular metal workpieces, and a special use of the device mentioned.
Elektrolytische Oberflächenbeschichtungen von metallischen Gegenständen bilden seit langem einen Teil des bekannten Standes der Technik; in der Patentliteratur ist die genannte Technologie breit vertreten.Electrolytic surface coatings of metallic objects have long been part of the known prior art; The technology mentioned is widely represented in the patent literature.
Neuere, einschlägige, veröffentlichte Patentanmeldungen sind u.a. die EP-A 0 196 420, die EP-A 0 387 750 sowie die DE-A 34 29 890.Recent, relevant, published patent applications include EP-A 0 196 420, EP-A 0 387 750 and DE-A 34 29 890.
In der EP-A 0 196 420 (Veröffentlichungsdatum 8. Oktober 1986) wird eine Hochgeschwindigkeits-Elektrolysezelle für die Oberflächenbeschichtung von bandförmigem Gut gelehrt. Die genannte Vorrichtung umfasst eine vertikale elektrolytische Verzinkungszelle zur Beschichtung von Stahlbändern, in der das Band von einer oberen Umlenk- oder Stromrolle zu einer unteren umlenkenden Tauchrolle und von dort zu einer weiteren, oberen Umlenk- oder Stromrolle geführt wird. Dabei wird der zu beschichtende ab- und aufsteigende Bandabschnitt in einem Spalt zwischen senkrecht angeordneten Anoden von dem im Umlauf geführten Eletrolytstrom mit hoher Geschwindigkeit entgegen der Bandlaufrichtung beaufschlagt. Bei einer solchen Elektrolysezelle wird die Umwälzung grosser Elektrolytmengen unter Einsatz möglichst geringer Pumpenergie erreicht.EP-A 0 196 420 (publication date October 8, 1986) teaches a high-speed electrolysis cell for the surface coating of strip-like material. Said device comprises a vertical electrolytic galvanizing cell for coating steel strips, in which the strip is guided from an upper deflection or current roller to a lower deflecting immersion roller and from there to a further, upper deflection or current roller. Here the descending and ascending strip section to be coated is acted upon in a gap between vertically arranged anodes by the circulating electrolyte stream at high speed against the strip running direction. In such an electrolysis cell, the circulation of large amounts of electrolyte is achieved using the lowest possible pump energy.
Gemäss der EP-A 0 387 750 (Veröffentlichungsdatum 19. September 1990) ist die darin beschriebene Elektrolysezelle durch mehrere Stromeinspeisungen und mehrere Elektrolytzuführungen bzw. -ableitungen spezifiziert. Dadurch wird eine gleichförmige Elektrolyse und Beschichtung erreicht.According to EP-A 0 387 750 (published on September 19, 1990), the electrolysis cell described therein is specified by a plurality of current feeds and a plurality of electrolyte feeds or discharges. This ensures uniform electrolysis and coating.
Die Vorrichtung aus der DE-A 34 29 890 schliesslich dient zum Aufbringen einer Kupferschicht auf einen Tiefdruckzylinder in einem Galvanisierbad, das einen kupferhaltigen Elektrolyten und wenigstens einen Anodenkörper aus Kupfer aufweist. Der Anodenkörper kann die Form einer mit einer Vielzahl von Durchbrechungen versehenen Platte haben, speziell die einer konzentrisch um den Druckzylinder angebrachten Loch- oder Streckmetallplatte. Diese Anordnung erlaubt das Fahren der Elektrolyse unter einer verhältnismässig geringen Spannung und ein Aufbringen einer gleichmässigen Kupferschicht auf den kathodisch geschalteten Tiefdruckzylinder.Finally, the device from DE-A 34 29 890 is used to apply a copper layer to a gravure cylinder in a galvanizing bath, which has a copper-containing electrolyte and at least one anode body made of copper. The anode body can have the shape of a plate provided with a plurality of openings, especially that of a perforated or expanded metal plate concentrically arranged around the pressure cylinder. This arrangement allows the electrolysis to be operated at a relatively low voltage and an even copper layer to be applied to the cathodically connected intaglio cylinder.
Den drei genannten Lehren ist gemeinsam, dass sie der konzeptionellen Beseitigung des Anodenschlammes keine genügende Beachtung schenken. Die Lösung dieser Aufgabe führt aber, wie Versuche der Anmelderin eindeutig gezeigt haben, zu einer hinsichtlich Homogenität, d.h. homogenem, feinkristallinem Gefügeaufbau wie auch Korrosionsbeständigkeit, wesentlich verbesserten Qualität der elektrisch aufgebrachten Oberflächenschicht.What the three above-mentioned teachings have in common is that they do not pay sufficient attention to the conceptual elimination of the anode sludge. However, as attempts by the applicant have clearly shown, the solution to this problem leads to a uniformity, i.e. homogeneous, fine crystalline structure as well as corrosion resistance, significantly improved quality of the electrically applied surface layer.
Das erfindungsgemässe Verfahren zur elektrolytischen Oberflächenbeschichtung von den elektrischen Strom leitenden, insbesondere von Metall-Werkstücken, mittels eines fluiden Elektrolyten ist dadurch gekennzeichnet,
- dass der Elektrolyt in kontrolliertem Umlauf in und um die Elektrolysezone zwischen der Anode und dem kathodisch geschalteten Werkstück gefördert wird, wobei der Elektrolyt zum grösseren Teil mit hoher Durchsatzrate, gegebenenfalls unter höherem Eintrittsdruck, durch den Raum zwischen dem kathodisch geschalteten Werkstück und der Anode sowie, zum kleineren Teil, mit geringerer Durchsatzrate an der der Kathode abgewandten hinteren Seite der Anode von unten nach oben gefördert wird,
- dass der Elektrolyt nach dem Verlassen der Elektrolysezone in einen separaten Ueberlaufbehälter geführt wird und
- dass der Elektrolyt aus dem Ueberlaufbehälter wieder in und um die Elektrolysezone zwischen Anode und Kathode gefördert wird,
- that the electrolyte is conveyed in a controlled circulation in and around the electrolysis zone between the anode and the cathodically connected workpiece, the electrolyte for the most part at a high throughput rate, possibly under a higher inlet pressure, through the space between the cathodically connected workpiece and the anode, and to a smaller extent, with a lower throughput rate on the rear side of the anode facing away from the cathode, from bottom to top
- that the electrolyte is led into a separate overflow container after leaving the electrolysis zone and
- that the electrolyte is conveyed from the overflow tank back into and around the electrolysis zone between the anode and cathode,
Beim genannten Verfahren ist weiter relevant, dass der Elektrolyt so an die Anode heran-, durch die Anode hindurch- bzw. von der Anode abgeführt wird, dass der wesentliche Teil des sich während der Elektrolyse bildenden Anodenschlammes vom strömenden Elektrolyten abgeführt wird.In the above-mentioned method, it is also relevant that the electrolyte is brought up to the anode, through the anode or removed from the anode in such a way that the major part of the anode sludge which forms during the electrolysis is removed from the flowing electrolyte.
Vorteilhafterweise wird der Elektrolyt auf dem Umlauf hinsichtlich der wesentlichen Verfahrensparameter wie Temperatur, Umsatz, Gehalte usw. dauernd kontrolliert und, nötigenfalls, optimiert.Advantageously, the electrolyte on the circulation is continuously checked with regard to the essential process parameters such as temperature, conversion, contents, etc. and, if necessary, optimized.
Das kathodisch geschaltete Werkstück ist dabei entweder fixiert oder es wird während der elekrolytischen Oberflächenbeschichtung bewegt, insbesondere gedreht; die Anode wird entweder periodisch ersetzt oder das Anodenmaterial kontinuierlich nachgeführt.The cathodically connected workpiece is either fixed or it is moved, in particular rotated, during the electrolytic surface coating; the anode is either replaced periodically or the anode material is continuously updated.
Vom Elektrolyten wird, wie gesagt, während dessen Durchlauf durch den Ueberlaufbehälter der Anodenschlamm entweder mittels Absetzen und/oder mittels Elektroden abgetrennt bzw. abgeschieden, und/oder die Schlammteilchen werden an einem in die Rückfördereinrichtung eingeschalteten Filter zurückgehalten.As said, the anode sludge is separated or separated from the electrolyte during its passage through the overflow tank either by settling and / or by electrodes, and / or the sludge particles are retained on a filter switched on in the return device.
Die erfindungsgemässe Vorrichtung zur elektrolytischen Oberflächenbeschichtung von den elektrischen Strom leitenden, insbesondere Metall-Werkstücken, mittels eines fluiden Elektrolyten, ist gekennzeichnet
- durch einen Elektrolysebehälter, in welchem die Oberflächenbeschichtung des als Kathode geschalteten Werkstückes und die Abgabe des Beschichtungsmaterials von der Anode oder aus dem Elektrolyten ablaufen,
- durch Zuführleitungen bzw. -öffnungen für den Elektrolyten unten in den Raum zwischen dem kathodisch geschalteten Werkstück und der Anode bzw. unten hinter die Anode,
- durch mindestens einen an den bzw. unter dem Elektrolysebehälter anschliessenden Ueberlaufbehälter, in welchen der Elektrolyt nach dem Durchlaufen der Elektrolysezone gelangt, und
- durch eine Rückfördereinrichtung mit einem Filter, welche sowohl den Umlauf des Elektrolyten, wie dessen Reinigung von Anodenschlamm wie auch dessen hinsichtlich Menge, Richtung und Geschwindigkeit technisch genügend kontrollierte Zuführung an bzw. durch die Anode ermöglicht.
- through an electrolysis container in which the surface coating of the workpiece connected as cathode and the release of the coating material from the anode or from the electrolyte run,
- through supply lines or openings for the electrolyte at the bottom into the space between the cathodically connected workpiece and the anode or at the bottom behind the anode,
- by at least one overflow tank adjoining or below the electrolysis tank, into which the electrolyte enters after passing through the electrolysis zone, and
- by means of a return conveyor with a filter which enables both the circulation of the electrolyte and its cleaning of anode sludge as well as its supply to and through the anode which is technically sufficiently controlled in terms of quantity, direction and speed.
Speziell geeignet sind dabei die Zuführleitungen bzw. -öffnungen für den Elektrolyten in die Anodenzone, die in ihrer Anzahl, Anordnung und Durchsatz variabel und optimierbar sind.The supply lines or openings for the electrolyte into the anode zone are particularly suitable, the number, arrangement and throughput of which can be varied and optimized.
Entweder ist also der Boden des Ueberlaufbehälters als Absetzkonus mit Entleerungsvorrichtung ausgebildet - welcher Absetzkonus noch Umlenkbleche und/oder Abscheideelektroden zur Verbesserung des Abscheidungsgrades aufweisen kann - und/oder es ist in der Leitung der Rückfördereinrichtung in Strömungsrichtung vor dem Förderaggregat ein Filter vorgesehen, das kontinuierlich oder periodisch gereinigt wird.Either the bottom of the overflow container is designed as a settling cone with an emptying device - which settling cone can also have deflection plates and / or separating electrodes to improve the degree of separation - and / or it is in the line of the Return conveyor in the flow direction in front of the conveyor unit provided a filter that is cleaned continuously or periodically.
In der oben spezifizierten Vorrichtung
- kann der kathodisch geschaltete Gegenstand entweder fixiert oder beweglich, insbesondere drehbar, teilweise oder ganz eingetaucht im sich im Elektrolysebehälter befindlichen Eletrolyten gehalten sein und
- kann/können die Anode bzw. die Anodenteile - ebenfalls im Elektrolyten - eingetaucht und hinsichtlich ihrer Lage gegenüber dem kathodisch geschalteten Gegenstand optimal angeordnet sein.
- the cathodically connected object can either be fixed or movable, in particular rotatable, partially or completely immersed in the electrolyte located in the electrolysis container and
- can the anode or the anode parts - likewise in the electrolyte - be immersed and optimally arranged with respect to their position in relation to the cathodically connected object.
Der kathodisch geschaltete Gegenstand kann ein Druckzylinder für den Tiefdruck sein, welcher teilweise in den Elektrolyten eingetaucht gehalten und fixiert oder drehbar angeordnet ist; die Anodenteile sind dann schalenförmig und in geringem Abstand vom Druckzylinder angeordnet, wobei die Teile porös oder gelocht vorliegen können. Die Zuführungsleitungen- bzw. -öffnungen für den Elektrolyten zur Elektrolysezone sind solche, die hinsichtlich Menge, Verteilung, Richtung und Geschwindigkeit eine technisch genügend genau kontrollierte Zuführung des Elektrolyten in die genannte Zone erlauben.The cathodically connected object can be a printing cylinder for gravure printing, which is partially immersed in the electrolyte and is fixed or rotatably arranged; the anode parts are then bowl-shaped and arranged at a short distance from the pressure cylinder, the parts may be porous or perforated. The feed lines or openings for the electrolyte to the electrolysis zone are those which, in terms of quantity, distribution, direction and speed, permit a technically sufficiently precisely controlled feed of the electrolyte into the zone mentioned.
Wichtig sind dabei auch Vorrichtungen zur Kontrolle und Optimierung der Verfahrens-Hauptparameter des Elektrolyten wie Durchsatz, Temperatur, Konzentrationen usw.Devices for checking and optimizing the main process parameters of the electrolyte such as throughput, temperature, concentrations, etc. are also important.
Verwendung findet die erfindungsgemässe Vorrichtung primär zur Herstellung von Tiefdruckzylindern mit einer fremdkörper- (v.a. schlamm-) einschlussfreien und daher feinkristallinen, homogenen und auch korrosionsbeständigen Materialstruktur der Oberflächenbeschichtung.The device according to the invention is used primarily for the production of gravure cylinders with a material structure of the surface coating that is free of foreign matter (especially sludge) and therefore finely crystalline, homogeneous and also corrosion-resistant.
Im folgenden werden nun sowohl die erfindungsgemässe Verrichtung wie auch das damit ausgeführte Verfahren anhand der beiden zur Erfindungsbeschreibung gehörenden Figuren beispielhaft und detailliert erläutert.In the following, both the execution according to the invention and the method carried out with it are explained in detail and by way of example using the two figures belonging to the description of the invention.
Dabei zeigen
- die Figur 1 eine schematisch dargestellte erfindungsgemässe Vorrichtung mit dem an den Elektrolysebehälter anschliessenden Ueberlaufbehälter und
- die Figur 2 eine analog dargestellte entsprechende Vorrichtung mit dem unterhalb des Elektrolysebehälters angeordneten Ueberlaufbehälter.
- 1 shows a schematically illustrated device according to the invention with the overflow container adjoining the electrolysis container and
- 2 shows a corresponding device shown in an analog manner with the overflow container arranged below the electrolysis container.
In der Vorrichtung gemäss der Figur 1 ist der Elektrolysebehälter 1.01 mit dem Elektrolytbad 1.02 zentral angeordnet; selbstverständlich entsprechen die tatsächlichen Dimensionen dieses Behälters denjenigen des zu beschichtenden Werkstückes. Die Anode bzw. die Anodenteile 1.03 sind entsprechend dem kathodisch geschalteten Werkstück 1.04 eingerichtet. Mittels der zwei Zuführleitungen 1.05a, 1.05b wird der Elektrolyt zu den entsprechenden Austrittsöffnungen 1.06a, 1.06b und 1.07a, 1.07b gebracht. Die beiden Austrittsöffnungen 1.07a, 1.07b sind so beschaffen und gerichtet, dass ein Grossteil des geförderten Elektrolyten unten in den Raum zwischen den Anodenteilen 1.03 und dem kathodisch geschalteten Werkstück 1.04 gelangt und von dort zwischen den Elektroden hinauf- und zum Teil durch die Anodenteile hindurchfliesst: Dies wird in der Figur durch die Pfeile angedeutet. Ein geringerer Teil des Elektrolyten tritt bei den Oeffnungen 1.06a, 1.06 in das Elektrolytbad aus und bewegt sich von dort an der der Kathode abgewandten Seite der Anode nach oben. Diese beiden gelenkten Strömungen bewirken eine optimale Entfernung und einen genügend sicheren Abtransport des grössten Teils des beim Auflösen der Anode sich bildenden Anodenschlammes.In the device according to FIG. 1, the electrolysis container 1.01 with the electrolyte bath 1.02 is arranged centrally; of course, the actual dimensions of this container correspond to those of the workpiece to be coated. The anode or the anode parts 1.03 are set up in accordance with the cathodically connected workpiece 1.04. The electrolyte is brought to the corresponding outlet openings 1.06a, 1.06b and 1.07a, 1.07b by means of the two feed lines 1.05a, 1.05b. The two outlet openings 1.07a, 1.07b are designed and directed in such a way that a large part of the electrolyte conveyed reaches the bottom between the anode parts 1.03 and the cathodically connected workpiece 1.04 and from there flows up between the electrodes and partly through the anode parts : This is indicated in the figure by the arrows. A smaller part of the electrolyte exits into the electrolyte bath at the openings 1.06a, 1.06 and moves upwards from there on the side of the anode facing away from the cathode. These two directed flows ensure an optimal removal and a sufficiently safe removal of most of the anode sludge that forms when the anode is dissolved.
Zusammen mit dem umlaufenden Elektrolyten tritt der Anodenschlamm aus dem Elektrolysebehälter aus in die neben dem genannten Behälter angeordneten Ueberlaufbehälter 1.08a, 1.08b. Falls also der Elektrolytbehälter 1.02 eine längere Wanne ist, sind die beiden angeschlossenen Ueberlaufbehälter 1.08a, 1.08b schmale Seitenwannen. Aus den Ueberlaufbehältern 1.08a, 1.08b läuft der flüssige Elektrolyt durch die Leitungen 1.09a, 1.09b den Förderaggregaten 1.10a, 1.10b zu, welche das Medium via die Filter 1.11a, 1.11b wieder durch die Leitungen 1.05a, 1.05b den weiter oben beschriebenen Austrittsöffnungen zufördern.Together with the circulating electrolyte, the anode sludge emerges from the electrolysis tank into the overflow tanks 1.08a, 1.08b arranged next to the aforementioned tank. So if the electrolyte tank 1.02 is a longer tub, the two connected overflow tanks 1.08a, 1.08b are narrow side tubs. From the overflow tanks 1.08a, 1.08b the liquid electrolyte runs through the lines 1.09a, 1.09b to the delivery units 1.10a, 1.10b, which the medium via the filters 1.11a, 1.11b again through the lines 1.05a, 1.05b to those described above Feed out openings.
Die zwei Ueberlaufbehälter 1.08a, 1.08b (sie können gemeinsam einen umlaufenden, geschlossenen Auffangbehälter bilden) können unten einzelne bzw. einen zusammenhängenden Absetzkonus 1.12a, 1.12b mit entsprechender Entleerungsleitung aufweisen.The two overflow containers 1.08a, 1.08b (they can jointly form a peripheral, closed collecting container) can have individual or a coherent settling cone 1.12a, 1.12b with a corresponding drain line at the bottom.
In der Figur 2 ist die entsprechende Vorrichtung mit dem unter dem Elektrolysebehälter 2.01 angeordneten Ueberlaufbehälter 2.08 dargestellt. Auch der letztgenannte Behälter weist einen Absetzzylinder 2.12 mit einer Entleerungsleitung auf.FIG. 2 shows the corresponding device with the overflow container 2.08 arranged under the electrolysis container 2.01. The latter container also has a settling cylinder 2.12 with an emptying line.
In beiden Figuren sind die Behelfsvorrichtungen zur Kontrolle und Optimierung der Betriebsparameter für den Elektrolyten nicht eingezeichnet.The auxiliary devices for checking and optimizing the operating parameters for the electrolyte are not shown in both figures.
Erst durch die aktive Entfernung des Anodenschlammes am Entstehungsort und der passiven Abscheidung desselben aus dem Elektrolytkreislauf wird der erfindungsgemäss zu lösende Effekt voll erreicht. Für den Fachmann ist dabei klar, dass die in diesen Beispielen angegebenen praktischen Mittel für die aktive und die passive Anodenschlammentfernung noch durch andere, wirkungsanaloge Elemente ersetzt werden können.Only by actively removing the anode sludge at the point of origin and passively separating it from the electrolyte cycle is the effect to be achieved in accordance with the invention fully achieved. It is clear to the person skilled in the art that the practical means for active and passive anode slime removal given in these examples can also be replaced by other, effect-analogous elements.
Claims (12)
- Method for the electrolytic surface coating of in particular metal work-pieces carrying electrical current, by means of a fluid electrolyte, in which case- the electrolyte is conveyed in controlled circulation in and around the electrolysis zone between the anode and the cathodically connected work-piece, the electrolyte being conveyed upwards for the major part at a high throughflow rate, possibly at a relatively high inlet pressure, through the space between the cathodically connected work-piece and the anode and for the minor part at a lower throughflow rate on the rear side of the anode remote from the cathode,- after leaving the electrolysis zone, the electrolyte is conveyed into a separate overflow container and- from the overflow container the electrolyte is again conveyed into and around the electrolysis zone between the anode and cathode,and in the overflow container and/or in the return device, anode mud is dissociated or separated from the electrolyte.
- Method according to Patent Claim 1, further characterised in that the electrolyte is guided towards the anode, through the anode or away from the anode so that the essential part of the anode mud forming during electrolysis is discharged by the flowing electrolyte.
- Method according to Patent Claim 1 and/or 2, characterised in that during circulation the electrolyte is permanently checked and, if necessary, optimized as regards the essential parameters of the method such as temperature, reaction, contents etc..
- Method according to Patent Claim 3, further characterised in that the cathodically connected work-piece is either fixed or moved, in particular rotated during the electrolytic surface coating and that the anode is either replaced periodically or the anode material is supplied continuously.
- Method according to one of Patent Claims 1 up to and including 4, characterised in that the anode mud is separated or dissociated either by means of settling and/or by means of electrodes from the electrolyte during its passage through the overflow container and/or the mud particles are retained on a filter incorporated in the return device.
- Apparatus for the electrolytic surface coating of in particular metal work-pieces carrying electrical current, by means of a fluid electrolyte, with- an electrolysis tank (1.01), in which the surface coating of the work-piece (1.04) connected as a cathode and the delivery of the coating material from the anode (1.03) or from the electrolyte take place,- supply pipes (1.05) or openings (1.06, 1.07) for the electrolyte on the under side in the space between the cathodically connected work-piece (1.04) and the anode (1.03) or on the under side behind the anode,- at least one overflow container (1.08, 2.08) adjoining or below the electrolysis tank, in which the electrolyte arrives after travelling through the electrolysis zone, and- a return device with a filter (1.11), which facilitates both the circulation of the electrolyte, as well as its cleaning as regards anode mud as well as its supply to or through the anode in a controlled manner which is technically satisfactory as regards quantity, direction and speed.
- Apparatus according to Patent Claim 6, further characterised in that the supply pipes (1.05) or openings (1.06, 1.07) for the electrolyte in the anode zone are variable and can be optimized as regards their number, arrangement and throughput.
- Apparatus according to Patent Claim 7, characterised in that either the base of the overflow container is constructed as a settling cone (1.12, 2.12) with an emptying device, which settling cone may also comprise baffle plates and/or separating electrodes for improving the degree of separation, as well as in that provided in the pipe of the return device in the flow direction in front of the conveying unit (1.10) is a filter (1.11), which can be cleaned continuously or periodically.
- Apparatus according to Patent Claims 7 and 8, further characterised in that,- the cathodically connected object (1.04) is held in either a fixed or movable manner, in particular a rotary manner, immersed partially or completely in the electrolyte (1.02) located in the electrolysis tank and- that the anode or the anode parts (1.03) are likewise immersed in the electrolyte (1.02) and are arranged in an optimum manner as regards their position opposite the cathodically connected object (1.04).
- Apparatus according to one of Patent Claims 6 up to and including 9, further characterised in that provided as the cathodically connected object (1.04) is a printing cylinder for intaglio printing, which is held partially immersed in the electrolyte (1.02) and can be arranged to be fixed or to rotate, that the anode parts (1.03) are arranged in the form of a shell and at a short distance from the printing cylinder, the parts being able to be porous or perforated and that the supply pipes (1.05) or openings (1.06, 1.07) for supplying the electrolyte to the electrolysis zone, allow the supply of electrolyte to the said zone in a manner which is exactly controlled in a technically satisfactory manner as regards quantity, distribution, direction and speed.
- Apparatus according to one of Patent Claims 6 up to and including 9, further characterised by apparatus for controlling and optimizing the main method parameters of the electrolyte such as throughput, temperature, concentrations etc..
- Use of the apparatus according to one of Patent Claims 6 up to and including 10 for the production of intaglio printing cylinders with a material structure of the surface coating which is free from the inclusion of foreign bodies (inter alia mud) and therefore has a fine crystalline structure which is homogeneous and also resistant to corrosion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT94905645T ATE152191T1 (en) | 1994-02-15 | 1994-02-15 | METHOD AND DEVICE FOR ELECTROLYTIC SURFACE COATING OF WORKPIECES |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CH1994/000031 WO1995021952A1 (en) | 1994-02-15 | 1994-02-15 | Process and device for the electrolytic surface coating of workpieces |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0694090A1 EP0694090A1 (en) | 1996-01-31 |
| EP0694090B1 true EP0694090B1 (en) | 1997-04-23 |
Family
ID=4549341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94905645A Expired - Lifetime EP0694090B1 (en) | 1994-02-15 | 1994-02-15 | Process and device for the electrolytic surface coating of workpieces |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5716509A (en) |
| EP (1) | EP0694090B1 (en) |
| AU (1) | AU5968594A (en) |
| DE (1) | DE59402538D1 (en) |
| WO (1) | WO1995021952A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345153A (en) * | 2011-09-09 | 2012-02-08 | 东莞生益电子有限公司 | Copper-plated cylinder organic pollution purification device and purification method thereof |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2324805A (en) * | 1997-04-30 | 1998-11-04 | Platt Electromeck Limited | Electroplating |
| DE19839479A1 (en) * | 1998-08-29 | 2000-03-02 | Schaeffler Waelzlager Ohg | Chemical or electrochemical treatment of an axisymmetric hollow component involves holding the component in a rotating unit so that a circumferential section of the component is dipped into the treatment bath |
| AT411906B (en) * | 2002-10-04 | 2004-07-26 | Miba Gleitlager Gmbh | METHOD FOR GALVANIC COATING OF A CYLINDRICAL INTERIOR SURFACE OF A WORKPIECE, SIGNIFICANTLY EXTENDING OVER A SEMI-CIRCLE |
| FR2870142B1 (en) * | 2004-05-17 | 2007-02-09 | Snecma Moteurs Sa | METHOD FOR REMOVING A REVOLUTION HOLLOW PIECE AND DEVICE IMPLEMENTING SAID METHOD |
| CN110344100B (en) * | 2019-07-23 | 2024-05-28 | 江苏欧姆圣智能装备股份有限公司 | Overflow device for plating tank |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1417464A (en) * | 1920-07-16 | 1922-05-23 | Thomas A Edison | Production of thin metal sheets or foils |
| US3450625A (en) * | 1964-10-29 | 1969-06-17 | Kenneth C Ramsey | Electrolytic plating tank |
| BE791007A (en) * | 1971-11-09 | 1973-05-07 | Citroen Sa | IMPROVEMENTS MADE TO INSTALLATIONS TO PERFORM ELECTROLYTIC COATING |
| US4160709A (en) * | 1975-12-23 | 1979-07-10 | Messerschmitt-Bolkow-Blohm Gmbh | Process for the galvanic deposition of nickel from a nickel bath |
| NL7805266A (en) * | 1977-05-23 | 1978-11-27 | Uss Eng & Consult | METHOD AND DEVICE FOR GALVANIC TINER. |
| DE3107101A1 (en) * | 1981-02-20 | 1982-09-09 | Schering Ag, 1000 Berlin Und 4619 Bergkamen | DEVICE AND METHOD FOR GALVANIC METAL DEPOSITION ON OBJECTS, THE CLEANING OF ADHESIVE SURFACE TREATMENT AGENTS AND THEIR RECOVERY |
| DE3429890A1 (en) * | 1984-08-14 | 1986-02-20 | Maschinenfabrik Kaspar Walter GmbH & Co KG, 8000 München | Device for applying a copper layer onto an engraved cylinder |
| DE3510592A1 (en) * | 1985-03-23 | 1986-10-02 | Hoesch Stahl AG, 4600 Dortmund | HIGH-SPEED ELECTROLYSIS CELL FOR REFINING BAND-SHAPED GOODS |
| JP2549557B2 (en) * | 1989-03-14 | 1996-10-30 | 富士写真フイルム株式会社 | Electrolytic treatment equipment |
| US5346607A (en) * | 1992-09-30 | 1994-09-13 | Weirton Steel Corporation | Electrolytic tinplating and product |
| US5391285A (en) * | 1994-02-25 | 1995-02-21 | Motorola, Inc. | Adjustable plating cell for uniform bump plating of semiconductor wafers |
| US5514258A (en) * | 1994-08-18 | 1996-05-07 | Brinket; Oscar J. | Substrate plating device having laminar flow |
-
1994
- 1994-02-15 WO PCT/CH1994/000031 patent/WO1995021952A1/en active IP Right Grant
- 1994-02-15 DE DE59402538T patent/DE59402538D1/en not_active Expired - Fee Related
- 1994-02-15 AU AU59685/94A patent/AU5968594A/en not_active Abandoned
- 1994-02-15 EP EP94905645A patent/EP0694090B1/en not_active Expired - Lifetime
- 1994-02-15 US US08/532,771 patent/US5716509A/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345153A (en) * | 2011-09-09 | 2012-02-08 | 东莞生益电子有限公司 | Copper-plated cylinder organic pollution purification device and purification method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1995021952A1 (en) | 1995-08-17 |
| US5716509A (en) | 1998-02-10 |
| AU5968594A (en) | 1995-08-29 |
| EP0694090A1 (en) | 1996-01-31 |
| DE59402538D1 (en) | 1997-05-28 |
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