EP0875605A2 - Arrangement for the electrogalvanic metal coating of strips - Google Patents
Arrangement for the electrogalvanic metal coating of strips Download PDFInfo
- Publication number
- EP0875605A2 EP0875605A2 EP98107344A EP98107344A EP0875605A2 EP 0875605 A2 EP0875605 A2 EP 0875605A2 EP 98107344 A EP98107344 A EP 98107344A EP 98107344 A EP98107344 A EP 98107344A EP 0875605 A2 EP0875605 A2 EP 0875605A2
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- EP
- European Patent Office
- Prior art keywords
- anode
- strips
- strip
- arrangement
- metal coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 34
- 239000011248 coating agent Substances 0.000 title claims abstract description 33
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 27
- 239000002184 metal Substances 0.000 title claims abstract description 27
- 239000003792 electrolyte Substances 0.000 claims abstract description 18
- 239000011810 insulating material Substances 0.000 claims description 5
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 239000002253 acid Substances 0.000 abstract 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 12
- 229910052725 zinc Inorganic materials 0.000 description 12
- 239000011701 zinc Substances 0.000 description 12
- 239000010410 layer Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007688 edging Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000009528 severe injury Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
- C25D7/0642—Anodes
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
- C25D7/0692—Regulating the thickness of the coating
Definitions
- the invention relates to an arrangement for electro-galvanic Metal coating of strips by a metal enriched acidic electrolytes run with at least one insoluble anode arranged parallel to the tape, from which the current flows to the band connected as cathode, whereby Metal deposited from the electrolyte on the surface of the tape becomes.
- Cold-rolled strip made of normal carbon steel must have a Protective layer can be provided to prevent corrosion or at least to slow it down a lot.
- the type of protective layer depends on the intended use and the economic reasonable effort.
- the state of the art includes a. the galvanizing.
- the galvanizing can be protected by a metallic Coating can be achieved, which is applied electrolytically.
- Plants for one or two-sided application of such zinc layers in thicknesses of about 2.5 - 15 micrometers are from the State of the art known.
- the anodes are parallel to the band at the smallest possible distance between 5 and 30 mm arranged.
- the space between each anode and the strip is with an acidic electrolyte enriched with metal (zinc) filled.
- the current flows from the Anodes to the band connected as cathode, on the Surface the zinc is deposited.
- the belt should only be on one side further problems arise.
- a dummy anode e.g. a plastic plate
- the anode is only on the side not to be coated electrically switched off, it also happens that metal is deposited on the strip side that is not to be coated becomes.
- the reason for this is that of the wider anodes compared to the strip outside the strip area Current through the electrolyte to the switched off anode passes over and thus under tension towards the tape puts.
- edge masks are already used to counter these problems become known in the form of electrically insulating Plates or foils the flow of electricity between the two Prevent anodes next to the tape.
- the band edges encompass the front of the electrical insulating profiles arranged U-profiles. From the immersion depth of the strip edges in the U-profiles depends on the measure of the edge joint from. It is therefore necessary to use the U-profiles Always track the belt exactly. This requires a tape edge position measurement and complex edge mask drives with complicated measurement and control technology.
- edge masks Another disadvantage of edge masks is their susceptibility to interference. For example, not smooth band edges or sudden fluctuations in the width of the belt can occur damage the edge masks. Expensive downtimes and repairs are the consequence.
- edge masks require a minimum distance between the anodes in order to execute them with sufficient stability can.
- edge masks do not solve the problem that the coating thickness across the width of the tape is a direct one Image of the cross section of the belt is. Show the tape for example, a crossbow or other flatness or Angled positions between the anodes results in one uneven coating thickness. To this unwanted The coating processes are used to avoid the effect upstream of the prior art expensive straightening systems.
- the invention is based on this prior art based on the task of an arrangement for electro-galvanic To create a metal coating of the type mentioned at the outset, the edge growth of the deposited metal safely prevented and at the same time having the disadvantages of the arrangements Avoid edge masks.
- a uniform Metal coating independent of any band unevenness ensures removal of the anode on a not too coating side superfluous and no moving parts may be required in the anode area.
- this task is arranged in an arrangement mentioned type solved in that each anode in parallel is divided into anode strips for the direction of the strip, the anode strips are insulated from each other and each anode strip is individually powered.
- the arrangement according to the invention allows depending the respective width of the strip to be coated only those To supply anode strips with electricity that face each other the volume.
- the current tape position can be used for this determine with the belt position measuring system that is available anyway.
- the tape is coated further, but to a lesser extent. This also applies to the streak after next. As a result, switching off individual anode strips results to make the coating more uniform.
- anode strips are sufficiently narrow, you can choose the over or under coverage of the strip edges with energized anode strips also control the layer thickness, for example falling towards the edge of the belt, evenly or rising.
- the insulating strips protruding from the surface of each anode protect the with sufficiently narrow anode strips Anode before tape stops, for the extremely unplaned tapes or a decrease in tension in the band may be the cause can.
- the under current in conventional arrangements too high short-circuit currents and with severe damage band contact with the anode surface, are therefore safe in this embodiment of the invention avoided.
- the insulating strips are preferably made of wear-resistant and unbreakable Material made.
- anodes according to the invention there are several anodes according to the invention in the running direction of the strip connected in series. Because of the individual Control options for the anodes connected in series can be summed up with each one Anode individually controllable coating profile always a Ensure uniform layer thickness.
- the coating profile can be controlled particularly effectively, by using the anode strips with the help of a current regulator Be supplied with electricity.
- the current regulator holds that in everyone Anode strips desired current strength constant. Since after Law of the Coulomb the galvanically deposited metal mass is directly proportional to the total current, the Control the coating thickness precisely (e.g. one gram of zinc deposition requires 1.22 Ah).
- the thickness of the coating can be changed control the anode strips of each anode along their length are divided several times and each anode strip part is preferred is individually powered by a switch. For example, if the anode strip is divided into 4, each anode strip can have 0%, 25%, 50%, 75%, and 100 % Current is applied.
- Figure 1 shows an arrangement for electroplating a band 2 running in an electrolyte 1.
- Parallel to the surfaces 2a, 2b of the band 2 are small Distance an upper and a lower anode 3a, 3b arranged.
- the width of the upper and lower anode 3a, 3b is aligned the widest tape to be coated.
- Anode width is 2050 mm.
- Edge masks 4 consist of insulating plates 4a, 4b and the strip edges 2c, 2d comprising U profiles 4c, 4d.
- the dimension depends on the immersion depth t of the strip edges 2c, 2d the zinc plating.
- Figure 3 illustrates this relationship using the example of a arcuate cross section of the band 2, which between a upper and a lower anode 3a, 3b is performed.
- the arrangement according to the invention in FIG. 4 consists of individual ones Anode strips 5a, 5b, in the embodiment shown arranged both above and below the belt 2 are.
- the individual anode strips 5a, 5b are through Insulating strips 6a, 6b insulated from each other, which in the direction of the electrolyte 1 over the surface of the through the Protruding strips 5a, 5b formed anodes.
- the anode strips 5a, 5b each form a lower and a upper box-shaped anode, which with not shown in Figure 4 side closures also the flow channel for the Form electrolyte 1.
- the entire arrangement can be moved laterally with little time required for repair and / or Exchange maintenance work. Special coating cells are not necessary with such a design.
- each individual anode strip 5a, 5b each via its own switch 8a, 8b with a central one Rectifier 7a, 7b connected, which supplies it with current.
- central rectifiers 7a, 7b it is also possible a separate rectifier for each individual anode strip assign, either via a switch or a current regulator is connected to the anode strip.
- FIG. 5 assumes that 4 according to the invention designed anodes ( Figure 4) one behind the other in the tape running direction are arranged. In the exemplary embodiment just a coating on the surface 2a of the tape 2. The anode strips 5b of the lower anode are all switched off.
- FIG. 6 shows a smoothing of the zinc layer in the Edge area when passing through only 2 connected in series Anodes with different wiring of the anode strips 5a, 5b in the edge region of the band 2.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Description
Die Erfindung betrifft eine Anordnung zur elektrogalvanischen Metallbeschichtung von Bändern, die durch einen mit Metall angereicherten sauren Elektrolyten laufen, mit mindestens einer parallel zu dem Band angeordneten unlöslichen Anode, von der der Strom zum als Kathode geschalteten Band fließt, wobei Metall aus dem Elektrolyten auf der Oberfläche des Bandes abgeschieden wird.The invention relates to an arrangement for electro-galvanic Metal coating of strips by a metal enriched acidic electrolytes run with at least one insoluble anode arranged parallel to the tape, from which the current flows to the band connected as cathode, whereby Metal deposited from the electrolyte on the surface of the tape becomes.
Kaltgewalztes Band aus normalem Kohlenstoffstahl muß mit einer Schutzschicht versehen werden, um die Korrosion zu verhindern oder zumindest stark zu verzögern. Die Art der Schutzschicht richtet sich nach dem Verwendungszweck und dem wirtschaftlich vertretbarem Aufwand.Cold-rolled strip made of normal carbon steel must have a Protective layer can be provided to prevent corrosion or at least to slow it down a lot. The type of protective layer depends on the intended use and the economic reasonable effort.
Zum Stand der Technik gehört u. a. das Verzinken. Bei der Verzinkung kann der Korrosionsschutz durch einen metallischen Überzug erreicht werden, der elektrolytisch aufgetragen wird.The state of the art includes a. the galvanizing. In the The galvanizing can be protected by a metallic Coating can be achieved, which is applied electrolytically.
Anlagen zum ein- oder beidseitigem Auftragen derartiger Zinkschichten in Dicken von etwa 2,5 - 15 Micrometern sind aus dem Stand der Technik bekannt. Die Anoden sind parallel zum Band in einem möglichst geringen Abstand zwischen 5 und 30 mm angeordnet. Der Raum zwischen jeder Anode und dem Band ist mit einem mit Metall (Zink) angereicherten, sauren Elektrolyten gefüllt. Während des Beschichtens fließt der Strom von den Anoden zu dem als Kathode geschalteten Band, auf dessen Oberfläche das Zink abgeschieden wird.Plants for one or two-sided application of such zinc layers in thicknesses of about 2.5 - 15 micrometers are from the State of the art known. The anodes are parallel to the band at the smallest possible distance between 5 and 30 mm arranged. The space between each anode and the strip is with an acidic electrolyte enriched with metal (zinc) filled. The current flows from the Anodes to the band connected as cathode, on the Surface the zinc is deposited.
Mit diesen herkömmlichen Anordnungen kommt es sowohl bei einals auch bei beidseitiger Beschichtung zu Problemen. Die Stromflußdichte nimmt zu den Kanten des Bandes hin zu. Infolgedessen kommt es an den Bandkanten zu einer außerordentlich hohen Stromdichte, was zu einer verstärkten Abscheidung von Zink führt. Daher ist im Kanterbereich des Bandes die Zinkschicht etwa 2 bis 3 mal dicker als die mittlere Zinkschicht.With these conventional arrangements, it comes with both problems even with double-sided coating. The Current density increases towards the edges of the tape. Consequently there is an extraordinary problem at the belt edges high current density, resulting in increased deposition of Zinc leads. Therefore, the zinc layer is in the edge area of the tape about 2 to 3 times thicker than the middle zinc layer.
Abgesehen von der Metall- und Energieverschwendung führt dies zu Problemen beim Aufwickeln der Bänder und in den nachfolgenden Verarbeitungsprozessen. Aus diesem Grund müssen die Bänder an den Kanten vor dem Aufwickeln sehr breit basäumt werden, was neben dem erheblichen Materialverlust zusätzlichen Arbeitsaufwand mit sich bringt.Aside from wasting metal and energy, this leads problems with winding the tapes and in the subsequent ones Processing processes. For this reason, the Ribbons very broadly trimmed at the edges before winding what, in addition to the significant loss of material Brings labor.
Soll mit einer derartigen Anordnung das Band nur einseitig beschichtet werden, kommen weitere Probleme hinzu. Wird die Anode der nicht zu beschichtenden Bandseite völlig entfernt oder durch eine Dummy-Anode, (z. B. eine Kunststoffplatte) ersetzt, kommt es nicht nur zu einem Kantenaufzinken auf der zu beschichtenden Seite, sondern infolge eines Umgriffes des Stromflusses auch zu einem Kantenaufzinken auf der nicht zu beschichtenden Seite.With such an arrangement, the belt should only be on one side further problems arise. Will the Anode of strip side not to be coated completely removed or by a dummy anode (e.g. a plastic plate) replaced, there is not only an edging on the edge side to be coated, but as a result of a wrap around the Current flow also to an edge prong on the not too coating side.
Wird die Anode auf der nicht zu beschichtenden Seite lediglich elektrisch abgeschaltet, kommt es außerdem noch dazu, daß auch auf der nicht zu beschichtenden Bandseite Metall abgeschieden wird. Der Grund hierfür liegt darin, daß von den gegenüber dem Band breiteren Anoden außerhalb des Bandbereiches Strom durch den Elektrolyten auf die abgeschaltete Anode übergeht und diese damit unter Spannung gegenüber dem Band setzt.The anode is only on the side not to be coated electrically switched off, it also happens that metal is deposited on the strip side that is not to be coated becomes. The reason for this is that of the wider anodes compared to the strip outside the strip area Current through the electrolyte to the switched off anode passes over and thus under tension towards the tape puts.
Um diesen Problemen zu begegnen, sind bereits sogenannte Kantenmasken bekannt geworden, die in Form von elektrisch isolierenden Platten oder Folien den Stromfluß zwischen den beiden Anoden neben dem Band verhindern. So-called edge masks are already used to counter these problems become known in the form of electrically insulating Plates or foils the flow of electricity between the two Prevent anodes next to the tape.
Die Bandkanten umfassen an den Stirnseiten der elektrisch isolierenden Platten angeordnete U-Profile. Von der Eintauchtiefe der Bandkanten in die U-Profile hängt das Maß der Kantenaufzinkung ab. Es ist daher erforderlich, die U-Pofile dem Bandlauf stets exakt nachzuführen. Dies erfordert eine Bandkanten-Positionsmessung und aufwendige Kantenmaskenantriebe mit komplizierter Meß- und Regelungstechnik.The band edges encompass the front of the electrical insulating profiles arranged U-profiles. From the immersion depth of the strip edges in the U-profiles depends on the measure of the edge joint from. It is therefore necessary to use the U-profiles Always track the belt exactly. This requires a tape edge position measurement and complex edge mask drives with complicated measurement and control technology.
Ein weiterer Nachteil der Kantenmasken ist deren Störanfälligkeit. Beispielsweise nicht glatte Bandkanten oder plötzlich auftretende Breitenschwankungen des Bandes können die Kantenmasken beschädigen. Teuere Stillstände und Reparaturen sind die Folge.Another disadvantage of edge masks is their susceptibility to interference. For example, not smooth band edges or sudden fluctuations in the width of the belt can occur damage the edge masks. Expensive downtimes and repairs are the consequence.
Schließlich erfordern die Kantenmasken einen Mindestabstand zwischen den Anoden, um sie hinreichend stabil ausführen zu können.Finally, the edge masks require a minimum distance between the anodes in order to execute them with sufficient stability can.
Außerdem lösen auch die Kantenmasken nicht das Problem, daß die Beschichtungsdicke über die Breite des Bandes ein direktes Abbild des Querprofiles des Bandes ist. Weist das Band beispielsweise einen Querbogen oder andere Unplanheiten oder Schieflagen zwischen den Anoden auf, resultiert hieraus eine ungleichmäßige Beschichtungsdicke. Um diesen unerwünschten Effekt zu vermeiden, werden den Beschichtungsprozessen nach dem Stand der Technik teuere Streckrichtanlagen vorgeschaltet.In addition, the edge masks do not solve the problem that the coating thickness across the width of the tape is a direct one Image of the cross section of the belt is. Show the tape for example, a crossbow or other flatness or Angled positions between the anodes results in one uneven coating thickness. To this unwanted The coating processes are used to avoid the effect upstream of the prior art expensive straightening systems.
Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Anordnung zur elektrogalvanischen Metallbeschichtung der eingangs erwähnten Art zu schaffen, die Kantenaufwachsungen des abgeschiedenen Metalls sicher verhindert und gleichzeitig die Nachteile der Anordnungen mit Kantenmasken vermeidet. Insbesondere soll ein gleichmäßige Metallbeschichtung unabhängig von etwaigen Bandunplanheiten gewährleistet, eine Entfernung der Anode auf einer nicht zu beschichtenden Seite überflüssig und keine beweglichen Teile im Anodenbereich erforderlich sein.The invention is based on this prior art based on the task of an arrangement for electro-galvanic To create a metal coating of the type mentioned at the outset, the edge growth of the deposited metal safely prevented and at the same time having the disadvantages of the arrangements Avoid edge masks. In particular, a uniform Metal coating independent of any band unevenness ensures removal of the anode on a not too coating side superfluous and no moving parts may be required in the anode area.
Im einzelnen wird diese Aufgabe bei einer Anordnung der eingangs erwähnten Art dadurch gelöst, daß jede Anode parallel zur Laufrichtung des Bandes in Anodenstreifen geteilt ist, die Anodenstreifen gegeneinander isoliert sind und jeder Anodenstreifen einzeln mit Strom versorgt ist.In particular, this task is arranged in an arrangement mentioned type solved in that each anode in parallel is divided into anode strips for the direction of the strip, the anode strips are insulated from each other and each anode strip is individually powered.
Die erfindungsgemäße Anordnung erlaubt es, in Abhängigkeit der jeweiligen Breite des zu beschichtenden Bandes nur diejenigen Anodenstreifen mit Strom zu versorgen, die sich gegenüber dem Band befinden. Hierzu läßt sich die aktuelle Bandlage mit dem sowieso vorhandenen Bandlagenmeßsystem ermitteln.The arrangement according to the invention allows depending the respective width of the strip to be coated only those To supply anode strips with electricity that face each other the volume. The current tape position can be used for this determine with the belt position measuring system that is available anyway.
Mit der erfindungsgemäßen Anordnung lassen sich insbesondere auch unplane Bänder vorteilhaft beschichten, indem die Stromversorgung einzelner Anodenstreifen, die der Bandoberfläche näher stehen als vom Mittelwert der Abstände vorgesehen, abgeschaltet werden.With the arrangement according to the invention, in particular Also advantageously coat unplane tapes by using the power supply single anode strip, that of the strip surface stand closer than intended by the mean of the distances, switched off will.
Infolge der Streuwirkung der benachbarten Anodenstreifen wird das Band zwar weiter beschichtet, jedoch in geringerem Maße. Abgeschwächt gilt dies auch für die übernächsten Streifen. Infolgedessen führt das Abschalten einzelner Anodenstreifen zu einer Vergleichmäßigung der Beschichtung.As a result of the scattering effect of the adjacent anode strips the tape is coated further, but to a lesser extent. This also applies to the streak after next. As a result, switching off individual anode strips results to make the coating more uniform.
Wenn zwischen den Anodenstreifen angeordnete Isolierstoffe die Anodenstreifen gegeneinander isolieren und die Isolierstoffe zumindest über die dem Band zugewandte Oberfläche jeder Anode hinaus in das Elektrolyt hineinragen, wird ein Stromübergang von einem mit Strom versorgten Anodenstreifen auf einen nicht versorgten Anodenstreifen wirkungsvoll unterbunden. Dies wirkt sich insbesondere im Bandkantenbereich vorteilhaft aus, da der Stromfluß direkt auf die Bandoberfläche gelenkt und die beim Stand der Technik übliche, hohe Stromdichtenkonzentration unterbunden wird.If insulating materials arranged between the anode strips isolate the anode strips from each other and the insulating materials at least across the surface of the tape facing everyone Anode protruding into the electrolyte becomes a Current transfer from an anode strip supplied with current effectively prevented on an untreated anode strip. This particularly affects the band edge area advantageous because the current flow directly to the belt surface steered and the usual high in the prior art Current density concentration is prevented.
Sind die Anodenstreifen genügend schmal, läßt sich durch Wahl der Über- oder Unterdeckung der Bandkanten mit bestromten Anodenstreifen auch die Schichtdicke steuern, beispielsweise zur Bandkante hin abfallend, gleichmäßig oder ansteigend. Die über die Oberfläche jeder Anode hinausragenden Isolierstreifen schützen bei genügend schmalen Anodenstreifen die Anode vor Bandanschlägen, für die extrem unplane Bänder oder ein Nachlassen der Zugspannung in dem Band ursächlich sein können. Die unter Strom bei herkömmlicher Anordnungen zu hohen Kurzschlußströmen führenden und mit einer starken Beschädigung der Anodenoberfläche einhergehen Bandberührungen, werden in dieser Ausgestaltung der Erfindung daher sicher vermieden.If the anode strips are sufficiently narrow, you can choose the over or under coverage of the strip edges with energized anode strips also control the layer thickness, for example falling towards the edge of the belt, evenly or rising. The insulating strips protruding from the surface of each anode protect the with sufficiently narrow anode strips Anode before tape stops, for the extremely unplaned tapes or a decrease in tension in the band may be the cause can. The under current in conventional arrangements too high short-circuit currents and with severe damage band contact with the anode surface, are therefore safe in this embodiment of the invention avoided.
Um diesem Risiko noch wirksamer zu begegnen, sind die Isolierstreifen vorzugsweise aus verschleißfestem und bruchsicherem Material hergestellt.In order to counter this risk even more effectively, the insulating strips are preferably made of wear-resistant and unbreakable Material made.
Ein weiterer zentraler Vorteil der über die Oberfläche jeder Anode hinausragenden Isolierstreifen besteht darin, daß das Elektrolyt parallel mit der oder gegen die Bandlaufrichtung geführt wird. Die sich über die Bandbreite einstellende, gleichmäßige Strömungsgeschwindigkeit hat eine gleichmäßigere Metallabscheidung als bei den bekannten Anordnungen zur Folge, bei der Querströme auftreten können, insbesondere wenn die Zu- und/oder Abfuhr des strömenden Elektrolyts in den Anodenbereich nicht sorgfältig ausgeführt sind.Another key benefit of everyone's surface Insulating strip protruding from the anode is that the Electrolyte parallel with or against the tape running direction to be led. The bandwidth that even flow velocity has a more even one Metal deposition than in the known arrangements for Result in which cross currents can occur, especially if the supply and / or discharge of the flowing electrolyte in the Anode area are not carefully executed.
In einer vorteilhaften Ausgestaltung der Erfindung sind mehrere erfindungsgemäße Anoden in Laufrichtung des Bandes hintereinander geschaltet. Aufgrund der individuellen Steuerungsmöglichkeiten der hintereinander geschalteten Anoder läßt sich über die Summierung des mit jeder einzelnen Anode individuell steuerbaren Beschichtungsprofils eine stets gleichmäßige Schichtdicke gewährleisten.In an advantageous embodiment of the invention, there are several anodes according to the invention in the running direction of the strip connected in series. Because of the individual Control options for the anodes connected in series can be summed up with each one Anode individually controllable coating profile always a Ensure uniform layer thickness.
Besonders wirksam läßt sich das Beschichtungsprofil steuern, indem die Anodenstreifen mit Hilfe eines Stromreglers mit Strom versorgt werden. Der Stromregler hält die in jedem Anodenstreifen gewünschte Stromstärke konstant. Da nach dem Gesetz vom Coulomb die galvanisch abgeschiedene Metallmasse direkt proportional der Stromsumme ist, läßt sich damit die Beschichtungsdicke genau steuern (z.B. ein Gramm Zinkabscheidung erfordert 1,22 Ah).The coating profile can be controlled particularly effectively, by using the anode strips with the help of a current regulator Be supplied with electricity. The current regulator holds that in everyone Anode strips desired current strength constant. Since after Law of the Coulomb the galvanically deposited metal mass is directly proportional to the total current, the Control the coating thickness precisely (e.g. one gram of zinc deposition requires 1.22 Ah).
Alternativ läßt sich die Dicke der Beschichtung dadurch steuern, daß die Anodenstreifen jeder Anode über ihre Länge mehrfach unterteilt sind und jeder Anodenstreifenteil vorzugsweise über einen Schalter einzeln mit Strom versorgt ist. Wird der Anodenstreifen beispielsweise 4-fach unterteilt, kann jeder Anodenstreifen mit 0 %, 25 %, 50 %, 75 %, und 100 % Stromstärke beaufschlagt werden.Alternatively, the thickness of the coating can be changed control the anode strips of each anode along their length are divided several times and each anode strip part is preferred is individually powered by a switch. For example, if the anode strip is divided into 4, each anode strip can have 0%, 25%, 50%, 75%, and 100 % Current is applied.
Hierdurch wird ein prozentual adäquater Schichtaufbau auf dem Band im Bereich dieses Teils des Anodenstreifens hergestellt.As a result, an adequate percentage build-up on the Band made in the area of this part of the anode strip.
Nachfolgend wird die Erfindung anhand von Prinzipzeichnungen und Diagrammen zur Erfindung und zum Stand der Technik des näheren erläutert: The invention is described below on the basis of principle drawings and diagrams of the invention and the state of the art of explained in more detail:
Es zeigen:
- Figur 1:
- Eine Anordnung zum elektrogalvanischen Beschichten von Bändern nach dem Stand der Technik ohne Kantenmasken,
- Figur 2:
- eine Anordnung zur elektrogalvanischen Beschichtung von Bändern nach dem Stand der Technik mit Kantenmasken,
- Figur 3:
- eine Darstellung der Schichtdicke bei unplanen Bändern am Beispiel eines Bandes mit Querbogen,
- Figur 4:
- ein Ausführungsbeispiel einer erfindungsgemäßen Anordnung zur elektrogalvanischen Metallbeschichtung,
- Figur 5:
- eine Darstellung zur Schichtdickensteuerung mit Hilfe einer erfindungsgemäßen Anordnung mit vier hintereinander geschalteten Anoden bei einseitiger Beschichtung sowie
- Figur 6:
- ein Diagramm zur Verdeutlichung des Schichtdickenausgleichs im Kantenbereich des Bandes.
- Figure 1:
- An arrangement for the electro-galvanic coating of tapes according to the prior art without edge masks,
- Figure 2:
- an arrangement for the electrogalvanic coating of tapes according to the prior art with edge masks,
- Figure 3:
- a representation of the layer thickness in the case of uneven strips using the example of a strip with a transverse arch,
- Figure 4:
- an embodiment of an arrangement according to the invention for electro-galvanic metal coating,
- Figure 5:
- a representation of the layer thickness control with the aid of an arrangement according to the invention with four anodes connected in series with one-sided coating and
- Figure 6:
- a diagram to illustrate the layer thickness compensation in the edge region of the tape.
Figur 1 zeigt eine Anordnung zum elektrogalvanischen Beschichten
eines in einem Elektrolyt 1 laufenden Bandes 2.
Parallel zu den Oberflächen 2a, 2b des Bandes 2 sind in geringem
Abstand eine obere und eine untere Anode 3a, 3b angeordnet.
Die Breite der oberen und unteren Anode 3a, 3b richtet
sich nach dem breitesten zu beschichtenden Band. Bei
einer Breite des Bandes von beispielsweise 1850 mm kann die
Anodenbreite 2050 mm betragen.Figure 1 shows an arrangement for electroplating
a
Während der Metallbeschichtung fließt Strom von den Anoden
3a, 3b zu dem als Kathode geschalteten Band 2. Das Zink aus
den Elektrolyten 1 wird auf den Oberflächen 2a, 2b abgeschieden. Current flows from the anodes during metal coating
3a, 3b to the
Um eine Aufwachsung von Zink an Kanten 2c, 2d des Bandes 2 zu
verhindern, wurden im Stand der Technik die Anordnung sogenannter
Kantenmasken 4, wie in Figur 2 dargestellt, vorgeschlagen.
Sie bestehen aus isolierenden Platten 4a, 4b und
die Bandkanten 2c, 2d umfassenden U-Profilen 4c, 4d.To increase the growth of zinc on
Von der Eintauchtiefe t der Bandkanten 2c, 2d hängt das Maß
der Aufzinkung ab. Ein in der Figur 2 nicht gezeigter Antrieb
für die Kantenmaske 4 führt die U-Profile 4c, 4d exakt dem
Verlauf der Bandkanten 2c, 2d nach. Hiermit ist ein hoher
Meß- und Regelungsaufwand verbunden.The dimension depends on the immersion depth t of the strip edges 2c, 2d
the zinc plating. A drive, not shown in Figure 2
for the
Sowohl der Anordnung nach Figur 1 als auch nach Figur 2 haftet
der Nachteil an, daß die Beschichtungsdicke über die
Breite des Bandes ein direktes Abbild des Querprofiles des
Bandes 2 ist.Both the arrangement of Figure 1 and Figure 2 are liable
the disadvantage that the coating thickness over the
Width of the band is a direct image of the cross section of the
Figur 3 veranschaulicht diesen Zusammenhang am Beispiel eines
bogenförmigen Querschnitts des Bandes 2, das zwischen einer
oberen und einer unteren Anode 3a, 3b geführt wird.Figure 3 illustrates this relationship using the example of a
arcuate cross section of the
Die erfindungsgemäße Anordnung in Figur 4 besteht aus einzelnen
Anodenstreifen 5a, 5b, die im gezeigten Ausführungsbeispiel
sowohl oberhalb als auch unterhalb des Bandes 2 angeordnet
sind. Die einzelnen Anodenstreifen 5a, 5b sind durch
Isolierstreifen 6a, 6b gegeneinander isoliert, die in Richtung
des Elektrolyten 1 über die Oberfläche der durch die
Streifen 5a, 5b gebildeten Anoden hinausragen.The arrangement according to the invention in FIG. 4 consists of individual ones
Anode strips 5a, 5b, in the embodiment shown
arranged both above and below the
Die Anodenstreifen 5a, 5b bilden jeweils eine untere und eine
obere kastenförmige Anode, die mit in Figur 4 nicht gezeigten
seitlichen Abschlüssen zugleich den Strömungskanal für den
Elektrolyten 1 bilden. The anode strips 5a, 5b each form a lower and a
upper box-shaped anode, which with not shown in Figure 4
side closures also the flow channel for the
Indem mindestens einer der seitlichen Abschlüsse des
Strömungskanals für den Elektrolyten 1 lösbar ausgebildet
ist, läßt sich die gesamte Anordnung durch seitliches Verschieben
mit geringem Zeitaufwand für Reparatur- und / oder
Wartungsarbeiten austauschen. Besondere Beschichtungszellen
sind bei einer solchen Ausführung entbehrlich.By at least one of the side ends of the
Flow channel for the
Im Ausführungsbeispiel wird jeder einzelne Anodenstreifen 5a,
5b über jeweils einen eigenen Schalter 8a, 8b mit einem zentralen
Gleichrichter 7a, 7b verbunden, der ihn mit Strom versorgt.In the exemplary embodiment, each
In Figur 4 ist zu sehen, daß lediglich diejenigen Schalter
8a, 8b geschlossen sind, denen Anodenstreifen 5a, 5b zugeordnet
sind, die sich gegenüber der Oberfläche 2a, 2b des Bandes
2 befinden.In Figure 4 it can be seen that only those switches
8a, 8b are closed, to which anode strips 5a, 5b are assigned
are opposite the surface 2a, 2b of the
Anstelle der zentralen Gleichrichter 7a, 7b ist es auch möglich,
jedem einzelnen Anodenstreifen einen separaten Gleichrichter
zuzuordnen, der entweder über einen Schalter oder
einen Stromregler mit dem Anodenstreifen verbunden ist.Instead of the
Die lediglich wenige Millimeter in das Elektrolyt 1 hineinragenden
Isolierstreifen 6a, 6b verhindern ein Anschlagen des
Bandes 2.The protruding only a few millimeters into the
Die Darstellung in Figur 5 geht davon aus, daß 4 erfindungsgemäß
gestaltete Anoden (Figur 4) in Bandlaufrichtung hintereinander
angeordnet sind. In dem Ausführungsbeispiel erfolgt
lediglich eine Beschichtung auf der Oberfläche 2a des Bandes
2. Die Anodenstreifen 5b der unteren Anode sind sämtlich abgeschaltet.The representation in Figure 5 assumes that 4 according to the invention
designed anodes (Figure 4) one behind the other in the tape running direction
are arranged. In the exemplary embodiment
just a coating on the surface 2a of the
In der linken Bildhälfte ist die Beschaltung der einzelnen
Anodenstreifen 5a zu erkennen; im jeweiligen Diagramm rechts
daneben, die sich über die Breite des Bandes 2 auf dessen
Oberfläche 2a ausbildende Stärke der Zinkschicht.In the left half of the picture is the wiring of the individual
To recognize
Die Vergleichmäßigung durch die Aufsummierung der durch die aufeinanderfolgenden Anoden aufgebrachten Schichtstärken ist deutlich zu erkennen.The equalization by the summation of the by the successive anodes applied layer thicknesses clearly visible.
Schließlich zeigt Figur 6 eine Glättung der Zinkschicht im
Kantenbereich beim Durchlaufen von nur 2 hintereinander geschalteten
Anoden mit unterschiedlicher Beschaltung der Anodenstreifen
5a, 5b im Kantenbereich des Bandes 2.Finally, FIG. 6 shows a smoothing of the zinc layer in the
Edge area when passing through only 2 connected in series
Anodes with different wiring of the anode strips
5a, 5b in the edge region of the
Claims (9)
dadurch gekennzeichnet,
characterized,
dadurch gekennzeichnet,
daß die Anode breiter als jedes in der Anordnung zu beschichtende Band (2) ist.Arrangement for electrogalvanic metal coating of strips according to claim 1,
characterized,
that the anode is wider than each strip (2) to be coated in the arrangement.
dadurch gekennzeichnet,
characterized,
dadurch gekennzeichnet,
daß die Isolierstoffe in Form von Streifen (6a, 6b) verschleißfest und bruchsicher sind.Arrangement for electrogalvanic metal coating of strips according to one of claims 1 to 3,
characterized,
that the insulating materials in the form of strips (6a, 6b) are wear-resistant and unbreakable.
dadurch gekennzeichnet,
daß die Anodenstreifen (5a, 5b) eine Breite im Bereich zwischen 5 - 40 mm aufweisen.Arrangement for electrogalvanic metal coating of strips according to one of claims 1 to 4,
characterized,
that the anode strips (5a, 5b) have a width in the range between 5-40 mm.
dadurch gekennzeichnet,
daß mehrere Anoden in Laufrichtung des Bandes (2) hintereinander geschaltet sind.Arrangement for electrogalvanic metal coating of strips according to one of claims 1 to 5,
characterized,
that several anodes are connected in series in the running direction of the strip (2).
dadurch gekennzeichnet,
daß jeder Anodenstreifen (5a, 5b) einzeln mittels eines Schalters (8a, 8b) mit Strom versorgt ist. Arrangement for electrogalvanic metal coating of strips according to one of claims 1 to 6,
characterized,
that each anode strip (5a, 5b) is individually supplied with current by means of a switch (8a, 8b).
dadurch gekennzeichnet,
daß jeder Anodenstreifen (5a, 5b) einzeln mittels eines Stromreglers mit Strom versorgt ist.Arrangement for electrogalvanic metal coating of strips according to one of claims 1 to 6,
characterized,
that each anode strip (5a, 5b) is individually supplied with current by means of a current regulator.
dadurch gekennzeichnet,
daß die Anodenstreifen (5a, 5b) jeder Anode über ihre Länge mehrfach unterteilt sind und jeder Anodenstreifenteil, vorzugsweise über einen Schalter einzeln mit Strom versorgt ist.Arrangement for electrogalvanic metal coating of strips according to one of claims 1 to 8,
characterized,
that the anode strips (5a, 5b) of each anode are divided several times over their length and each anode strip part is supplied with current individually, preferably via a switch.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19717489A DE19717489B4 (en) | 1997-04-25 | 1997-04-25 | Arrangement for the electrogalvanic metal coating of a strip |
| DE19717489 | 1997-04-25 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0875605A2 true EP0875605A2 (en) | 1998-11-04 |
| EP0875605A3 EP0875605A3 (en) | 1998-12-09 |
| EP0875605B1 EP0875605B1 (en) | 2006-05-31 |
Family
ID=7827729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98107344A Expired - Lifetime EP0875605B1 (en) | 1997-04-25 | 1998-04-22 | Arrangement for the electrogalvanic metal coating of strips |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US6071384A (en) |
| EP (1) | EP0875605B1 (en) |
| JP (1) | JPH10310900A (en) |
| KR (1) | KR100568022B1 (en) |
| CN (1) | CN1221685C (en) |
| AT (1) | ATE328137T1 (en) |
| BR (1) | BR9801440A (en) |
| DE (2) | DE19717489B4 (en) |
| RU (1) | RU2205252C2 (en) |
| UA (1) | UA57003C2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7427337B2 (en) * | 1998-12-01 | 2008-09-23 | Novellus Systems, Inc. | System for electropolishing and electrochemical mechanical polishing |
| DE10100297A1 (en) * | 2001-01-04 | 2002-07-18 | Gesimat Gmbh | Device and method for electrochemical coating |
| KR20030025523A (en) * | 2001-09-21 | 2003-03-29 | 지에스티 반도체장비(주) | apparatus for electroplating PCB |
| DE102009041068A1 (en) * | 2009-09-10 | 2011-03-24 | GM Global Technology Operations, Inc., Detroit | Apparatus for electrophoretically depositing a varnish layer on an object, comprises two anodes having a first part and a second part, and a container for the reception of a solution of first anode and the object |
| KR20150057194A (en) | 2013-11-18 | 2015-05-28 | 삼성전기주식회사 | Plating apparatus |
| KR20150062008A (en) | 2013-11-28 | 2015-06-05 | 삼성전기주식회사 | Plating apparatus |
| KR102194716B1 (en) | 2014-03-06 | 2020-12-23 | 삼성전기주식회사 | Plating apparatus |
| KR101666461B1 (en) * | 2014-12-24 | 2016-10-14 | 주식회사 포스코 | Electro-plating apparatus for preventing edge area of plate from being overcoated |
| EP3064617B1 (en) * | 2015-03-03 | 2018-08-15 | MTV Metallveredlung GmbH & Co. KG | Method for nickel plating large-area components |
| CN109487328A (en) * | 2019-01-15 | 2019-03-19 | 山东宏旺实业有限公司 | A kind of pickling electrolytic cell |
| KR102022920B1 (en) * | 2019-06-25 | 2019-09-19 | 주식회사 태성 | Roll-to-roll Horizontal Continuous Plating Equipment |
| KR102597468B1 (en) * | 2019-11-14 | 2023-11-01 | 에스케이넥실리스 주식회사 | Apparatus for Plating of Electrolytic Copper Foil and Apparatus for Manufacturing of Electrolytic Copper Foil Having The Same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0254703A1 (en) * | 1986-07-17 | 1988-01-27 | DELLOYE-MATTHIEU, Société Anonyme des Tôleries | Process and apparatus for electroplating zinc on a steel strip |
| WO1990008209A1 (en) * | 1989-01-21 | 1990-07-26 | Hans Josef May | Device for electrolytic deposition of metals on one or both sides of strips |
| EP0491163A1 (en) * | 1990-12-19 | 1992-06-24 | Nikko Gould Foil Co., Ltd. | Method and apparatus for producing electrolytic copper foil |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4824925B1 (en) * | 1968-07-08 | 1973-07-25 | ||
| JPS5218649A (en) * | 1975-08-04 | 1977-02-12 | Taku Sasagawa | Free stand for twoowheel vehicle on ground |
| DE3017079A1 (en) * | 1980-05-03 | 1981-11-05 | Thyssen AG vorm. August Thyssen-Hütte, 4100 Duisburg | DEVICE FOR ELECTROPLATING |
| US4401523A (en) * | 1980-12-18 | 1983-08-30 | Republic Steel Corporation | Apparatus and method for plating metallic strip |
| AU530006B2 (en) * | 1981-02-24 | 1983-06-30 | Nippon Kokan Kabushiki Kaisha | Method and apparatus for electroplating steel strip |
| FR2725215B1 (en) * | 1994-09-29 | 1996-11-22 | Lorraine Laminage | CONTINUOUS ELECTRODEPOSITION CELL OF METAL ALLOYS |
-
1997
- 1997-04-25 DE DE19717489A patent/DE19717489B4/en not_active Expired - Fee Related
-
1998
- 1998-04-22 DE DE59813567T patent/DE59813567D1/en not_active Expired - Lifetime
- 1998-04-22 EP EP98107344A patent/EP0875605B1/en not_active Expired - Lifetime
- 1998-04-22 AT AT98107344T patent/ATE328137T1/en not_active IP Right Cessation
- 1998-04-22 JP JP10112345A patent/JPH10310900A/en active Pending
- 1998-04-23 BR BR9801440-4A patent/BR9801440A/en not_active IP Right Cessation
- 1998-04-23 UA UA98042060A patent/UA57003C2/en unknown
- 1998-04-23 US US09/065,317 patent/US6071384A/en not_active Expired - Fee Related
- 1998-04-24 RU RU98107629/02A patent/RU2205252C2/en not_active IP Right Cessation
- 1998-04-24 CN CNB981094589A patent/CN1221685C/en not_active Expired - Fee Related
- 1998-04-25 KR KR1019980014831A patent/KR100568022B1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0254703A1 (en) * | 1986-07-17 | 1988-01-27 | DELLOYE-MATTHIEU, Société Anonyme des Tôleries | Process and apparatus for electroplating zinc on a steel strip |
| WO1990008209A1 (en) * | 1989-01-21 | 1990-07-26 | Hans Josef May | Device for electrolytic deposition of metals on one or both sides of strips |
| EP0491163A1 (en) * | 1990-12-19 | 1992-06-24 | Nikko Gould Foil Co., Ltd. | Method and apparatus for producing electrolytic copper foil |
Non-Patent Citations (1)
| Title |
|---|
| CHEMICAL ABSTRACTS, vol. 87, no. 26, 26.Dezember 1977 Columbus, Ohio, US; abstract no. 208626, TOYODA, TOSHIO ET AL: "Control of the thickness during electroplating of metal strip" XP002060382 & JP 52 018 649 A (NIPPON STEEL CORP., JAPAN) * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0875605A3 (en) | 1998-12-09 |
| ATE328137T1 (en) | 2006-06-15 |
| UA57003C2 (en) | 2003-06-16 |
| US6071384A (en) | 2000-06-06 |
| KR19980081740A (en) | 1998-11-25 |
| RU2205252C2 (en) | 2003-05-27 |
| DE19717489B4 (en) | 2008-04-10 |
| DE59813567D1 (en) | 2006-07-06 |
| BR9801440A (en) | 1999-09-28 |
| CN1221685C (en) | 2005-10-05 |
| JPH10310900A (en) | 1998-11-24 |
| KR100568022B1 (en) | 2006-05-25 |
| EP0875605B1 (en) | 2006-05-31 |
| CN1206753A (en) | 1999-02-03 |
| DE19717489A1 (en) | 1998-10-29 |
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