EP0454710B1 - Process for electrolytic deposition of metals on one or both sides of strips - Google Patents
Process for electrolytic deposition of metals on one or both sides of strips Download PDFInfo
- Publication number
- EP0454710B1 EP0454710B1 EP90901741A EP90901741A EP0454710B1 EP 0454710 B1 EP0454710 B1 EP 0454710B1 EP 90901741 A EP90901741 A EP 90901741A EP 90901741 A EP90901741 A EP 90901741A EP 0454710 B1 EP0454710 B1 EP 0454710B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- anode
- coated
- portions
- divided
- 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.)
- Expired - Lifetime
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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
Definitions
- the invention relates to a method for the electrolytic deposition of metals on the strips forming the cathode, preferably steel strips, in which the strip section to be coated is guided in an electrolyte in a gap between two non-soluble anodes arranged parallel to one another, one anode in several directions transverse to the strip running direction sections which are electrically insulated from one another are divided, each of which can be acted upon differently in a controlled manner in a controlled manner.
- Both from DE-OS 30 17 079 and from JP-OS 1-17890 split anodes in the longitudinal direction of the strip are known in systems for coating strips on one or both sides.
- For one-sided coating the anodes on the side opposite the strip side not to be coated are removed or switched off. It should be noted, however, that often a partial coating still takes place on the end side that is not to be coated. Similar defects also have corresponding systems according to JP-OS 63-259 098, with which one-sided coating of tapes is also intended to take place.
- the object of the invention is, in a system operated with the method according to the preamble of claim 1, to keep the strip side which is not to be coated or an anode which is not participating in the coating free from metal precipitation.
- the anode is switched off in a known manner. Since the anode is divided into several relatively small sections transversely to the direction of travel of the strip to be coated, only small voltage potentials can build up in these small sections compared to the total length of the anode, which deposition processes from the anode or deposition processes from the electrolyte are not or can only trigger to a small extent.
- the corresponding division of the anode and its different electrical impingement proposed according to the invention enables control options which keep both the strip side which is not to be coated and the lower anode sections free of the undesired metal deposit.
- anodic voltage For certain anodes, such as non-soluble anodes coated with iridium dioxide, it may be useful to apply anodic voltage to the individual sections of the anode sections, which are in principle voltage-free, that is to say “not working,” to lower the voltage required to trigger a deposition in order to achieve this Avoid passivation of the anode and at the same time avoid coating the strip side that is not to be coated.
- An adapted anode application can be controlled in the individual anode sections.
- an anode surface consists of lead
- in one-sided coating operation on the side not to be coated precipitates at the end of the continuous strip section to be broken down again by deposition in the reverse direction, in which the anode section in the area of the outlet electrically, that is to say negatively with respect to the opposite strip section, the undesired precipitation is degraded on the side of the strip which is not to be coated, without a decisive precipitation occurring on the corresponding anode section.
- the housing of such a cell is designated by the number 1.
- the two anodes 3 and 4 are located in an approximately parallel arrangement to one another in the electrolyte bath, and the strip 8 to be coated runs through the gap formed between them. In this vertical arrangement, it runs from an upper deflection roller 5, possibly forming the current roller, to a lower roller 6 located in the electrolyte bath 2.
- the insoluble anode 3 is to be regarded as homogeneous over its length, the other insoluble anode 4 is divided several times parallel to the direction of tape travel.
- These anode sections which are preferably of equal size, bear the numbers 41, 42, 43 and 44. These sections are insulated from one another, for example by the plastic sections designated by the number 7.
- Each anode section can be electrically acted on by the separate connections 410, 420, 430 and 440.
- the corresponding control methods are preferably regulated and monitored, with different voltages or potentials being applied to the anode sections.
- the processes described above prevent or reduce the precipitation on the side of the strip 8 that is not to be coated.
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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)
- Electrolytic Production Of Metals (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum elektrolytischen Abscheiden von Metallen auf die die Kathode bildenden Bänder, vorzugsweise Stahlbänder, bei dem der zu beschichtende Bandabschnitt in einem Spalt zwischen zwei parallel zueinander angeordneten nichtlöslichen Anoden in einem Elektrolyten geführt ist, wobei eine Anode quer zur Bandlaufrichtung in mehrere gegeneinander elektrisch isolierte Abschnitte aufgeteilt ist, die jeweils gesteuert unterschiedlich elektrisch beaufschlagbar sind.The invention relates to a method for the electrolytic deposition of metals on the strips forming the cathode, preferably steel strips, in which the strip section to be coated is guided in an electrolyte in a gap between two non-soluble anodes arranged parallel to one another, one anode in several directions transverse to the strip running direction sections which are electrically insulated from one another are divided, each of which can be acted upon differently in a controlled manner in a controlled manner.
Bekannt ist ein solches Verfahren aus Patents Abstracts of Japan, C-579, March 23, 1989 Vol.13/No.119 (≙ JP 63-293200 A). Bei diesem bekannten Verfahren sollen mit den quer zur Bandlaufrichtung in mehrere gegeneinander elektrisch isolierte Abschnitte aufgeteilten Anoden und der unterschiedlichen elektrischen Beaufschlagung der einzelnen Abschnitte Vergleichmäßigungen der aufzutragenden Schichten erreicht werden. Durch die entsprechende Steuerung der jeweils angelegten Potentiale an den Anodenabschnitten soll offensichtlich erreicht werden, daß die galvanische Schicht keine Schwankungen in der Dicke zeigt.Such a method is known from Patents Abstracts of Japan, C-579, March 23, 1989 Vol.13 / No.119 (≙ JP 63-293200 A). In this known method With the anodes divided transversely to the strip running direction into several sections electrically insulated from each other and the different electrical loading of the individual sections, the layers to be applied are made more uniform. The corresponding control of the potentials applied to the anode sections is obviously intended to ensure that the galvanic layer shows no fluctuations in the thickness.
Sowohl aus der DE-OS 30 17 079 als auch aus der JP-OS 1-17890 sind in Längsrichtung des Bandes geteilte Anoden in Anlagen zur ein- oder beidseitigen Beschichtung von Bändern bekannt. Zur einseitigen Beschichtung werden dabei die Anoden auf der der nicht zu beschichtenden Bandseite gegenüberliegenden Seite entfernt oder stromlos geschaltet. Dabei ist jedoch festzustellen, daß häufig doch noch eine teilweise Beschichtung auf der nicht zu beschichtenden Beandseite erfolgt. Ähnliche Mängel weisen auch entsprechende Anlagen gemäß der JP-OS 63-259 098 auf, mit denen auch eine einseitige Beschichtung von Bändern erfolgen soll.Both from DE-OS 30 17 079 and from JP-OS 1-17890 split anodes in the longitudinal direction of the strip are known in systems for coating strips on one or both sides. For one-sided coating, the anodes on the side opposite the strip side not to be coated are removed or switched off. It should be noted, however, that often a partial coating still takes place on the end side that is not to be coated. Similar defects also have corresponding systems according to JP-OS 63-259 098, with which one-sided coating of tapes is also intended to take place.
Bei Anlagen dieser bekannten Art hat sich auch gezeigt, daß nicht nur auf der nicht zu beschichtenden Seite des Bandes sich Niederschläge bilden, sondern auch im unteren Anodenbereich. In diesem unteren Bereich werden je nach Anodenmaterial, beispielsweise im Falle von mit lridium-dioxid beschichteten Anoden, die Oberflächen passiviert und dadurch unbrauchbar. Die Erklärung muß offensichtlich darin gesehen werden, daß sich ein Spannungsabfall vom Einlauf bis zum Auslauf im jeweiligen zu beschichtenden Bandabschnitt einstellt, sodaß sich Potentialunterschiede zwischen der ansich stromlosen Anode und den gegenüber-liegenden Bandabschnitten ergeben, die offensichtlich ausreichend sind, um Abscheidungsvorgäng in Richtung Anode und/oder Band auszulösen.In plants of this known type, it has also been shown that precipitation does not only form on the side of the strip which is not to be coated, but also in the lower anode region. In this lower area, depending on the anode material, for example in the case of anodes coated with iridium dioxide, the surfaces are passivated and therefore unusable. The explanation must obviously be seen in the fact that there is a voltage drop from the inlet to the outlet in the respective strip section to be coated, so that potential differences arise between the currentless anode and the opposite band sections, which are obviously sufficient to trigger deposition processes in the direction of the anode and / or band.
Es ist daher auch bereits vorgeschlagen worden, die stromlose Anode durch Zwischenschaltung einer Isolierung, beispielsweise einer dünnen Kunststoffplatte, gegenüber dem Bandabschnitt zu isolieren. Solche Isolierplatten lassen sich jedoch häufig im sehr schmalen Spalt zwischen Band und Anode nicht unterbringen. Außerdem erfordert auch eine solche Maßnahme erhebliche Rüstzeiten bei der Umstellung vom beidseitigen Beschichtungsbetrieb auf den einseitigen Beschichtungsbetrieb und umgekehrt.It has therefore already been proposed to insulate the currentless anode from the strip section by interposing insulation, for example a thin plastic plate. However, such insulating plates can often not be accommodated in the very narrow gap between the strip and the anode. In addition, such a measure also requires considerable set-up times when switching from coating operation on both sides to coating operation on one side and vice versa.
Die Aufgabe der Erfindung besteht darin, in einer mit dem Verfahren nach dem Oberbegriff des Anspruchs 1 betriebenen Anlage, die nicht zu beschichtende Bandseite bzw. eine vorhandene nicht an der Beschichtung teilnehmende Anode vom Metallniederschlag frei zuhalten.The object of the invention is, in a system operated with the method according to the preamble of claim 1, to keep the strip side which is not to be coated or an anode which is not participating in the coating free from metal precipitation.
Gelöst wird die Erfindungsaufgabe mit einem Verfahren mit den Merkmalen des Anspruchs 1.The object of the invention is achieved with a method having the features of claim 1.
Bei diesem erfindungsgemäßen Verfahren zur einseitigen Beschichtung von Bändern wird in bekannter Weise die Anode stromlos geschaltet. Da die Anode quer zur Laufrichtung des zu beschichtenden Bandes in mehrere relativ kleine Abschnitte aufgeteilt ist, können sich in diesen gegenüber der Gesamtlänge der Anode kleinen Abschnitten gegenüber dem zu beschichtenden Band nur geringe Spannungspotentiale aufbauen, welche Abscheidungsvorgänge von der Anode oder Abscheidungsvorgänge aus dem Elektrolyten nicht oder nur in geringem Maße auszulösen vermögen. Die entsprechende Aufteilung der Anode und deren erfindungsgemäß vorgeschlagene unterschiedliche elektrische Beaufschlagung ermöglicht Steuerungsmöglichkeiten, die sowohl die nicht zu beschichtende Bandseite als auch untere Anodenabschnitte vom nicht erwünschten Metallniederschlag freihalten.In this method according to the invention for one-sided coating of strips, the anode is switched off in a known manner. Since the anode is divided into several relatively small sections transversely to the direction of travel of the strip to be coated, only small voltage potentials can build up in these small sections compared to the total length of the anode, which deposition processes from the anode or deposition processes from the electrolyte are not or can only trigger to a small extent. The corresponding division of the anode and its different electrical impingement proposed according to the invention enables control options which keep both the strip side which is not to be coated and the lower anode sections free of the undesired metal deposit.
Bei bestimmten Anoden, wie beispielsweise mit Iridium-dioxid beschichteten nichtlöslichen Anoden, kann es sinnvoll sein, die einzelnen Abschnitte der im Prinzip spannungsfreien, also "nicht arbeitenden" Anodenabschnitte ebenfalls anodisch mit geringeren als der zur Auslösung einer Abscheidung erforderlichen Spannung zu beaufschlagen, um die Passivierung der Anode und gleichzeitig eine Beschichtung der nicht zu beschichtenden Bandseite zu vermeiden. In den einzelnen Anodenabschnitten k ann eine angepaßte Anodenbeaufschlagung gesteuer werden.For certain anodes, such as non-soluble anodes coated with iridium dioxide, it may be useful to apply anodic voltage to the individual sections of the anode sections, which are in principle voltage-free, that is to say "not working," to lower the voltage required to trigger a deposition in order to achieve this Avoid passivation of the anode and at the same time avoid coating the strip side that is not to be coated. An adapted anode application can be controlled in the individual anode sections.
Es ist ebenfalls mit den erfindungsgemäßen Verfahren möglich, beispielsweise wenn eine Anodenoberfläche aus Blei besteht, beim einseitigen Beschichtungsbetrieb auf der nicht zu beschichtenden Seite entstandenen Niederschläge am Ende des durchlaufenden Bandabschnittes wieder durch Abscheidung in umgekehrter Richtung abzubauen, in dem im Bereich des Auslaufes die Anodenabschnitt derart elektrisch, d.h. negativ gegenüber dem gegenüberliegenden Bandabschnitt, beaufschlagt werden, daß der Abbau des nicht gewünschten Niederschlages auf der nicht zu beschichtenden Seite des Bandes erfolgt, ohne daß es zu einem entscheidenden Niederschlag auf dem entsprechenden Anodenabschnitt kommt.It is also possible with the method according to the invention, for example if an anode surface consists of lead, in one-sided coating operation on the side not to be coated precipitates at the end of the continuous strip section to be broken down again by deposition in the reverse direction, in which the anode section in the area of the outlet electrically, that is to say negatively with respect to the opposite strip section, the undesired precipitation is degraded on the side of the strip which is not to be coated, without a decisive precipitation occurring on the corresponding anode section.
Anhand einer prinzipiell dargestellten galvanischen Zelle wird die Erfindung im folgenden näher erläutert. Es zeigen:
- Fig. 1
- einen Längsschnitt durch eine solche Zelle
und - Fig. 2
- eine zu dem in Fig. 1 senkrechte Ansicht auf eine in Querrichtung mehrfach geteilte Anode in der Zelle.
- Fig. 1
- a longitudinal section through such a cell
and - Fig. 2
- a view perpendicular to that in FIG. 1 of an anode in the cell which is divided several times in the transverse direction.
Das Gehäuse einer solchen Zelle ist mit der Ziffer 1 bezeichnet. Im Elektrolytbad befinden sich in etwa paralleler Anordnung zueinander die beiden Anoden 3 und 4, durch deren zwischen sich gebildeten Spalt das zu beschichtende Band 8 hindurchläuft. Es läuft bei dieser Vertikalanordnung von einer oberen, ggfs. die Stromrolle bildenden Umlenkrolle 5, zu einer unteren sich im Elektrolytbad 2 befindenden Rolle 6.The housing of such a cell is designated by the number 1. The two
Während die nichtlösliche Anode 3 als über ihre Länge homogen anzusehen ist, ist die andere nichtlösliche Anode 4 parallel zur Bandlaufrichtung mehrfach parallel geteilt. Diese vorzugsweise gleichgroßen Anodenabschnitte tragen die Ziffer 41, 42, 43 und 44. Diese Abschnitte sind gegeneinander isoliert, beispielsweise durch die mit der Ziffer 7 bezeichneten Kunststoffabschnitte.While the
Jeder Anodenabschnitt ist durch die getrennten Anschlüsse 410, 420, 430 und 440 elektrisch beaufschlagbar.Each anode section can be electrically acted on by the
Die entsprechenden Steuerungsverfahren erfolgen vorzugsweise geregelt und überwacht, wobei an den Anodenabschnitten unterschiedliche Spannungen bzw. Potentiale angelegt werden. Durch die vorher beschriebenen Verfahren werden die Niederschläge auf der nicht zu beschichtenden Seite des Bandes 8 verhindert bzw. abgebaut.The corresponding control methods are preferably regulated and monitored, with different voltages or potentials being applied to the anode sections. The processes described above prevent or reduce the precipitation on the side of the strip 8 that is not to be coated.
Claims (3)
- Method for the electrolytic deposition of metals on cathode formed strips, preferably steel strips, wherein the strip portion to be coated is conducted in an electrolyte through a gap between two insoluble anodes, which are disposed parallel to each other, one anode being divided, transversely relative to the direction of travel of the strip, into a plurality of portions, which are electrically insulated from one another and are each electrically actuatable in a different and controlled manner, characterised in that, for the one-sided deposition of the metal on the strip (8), the anode portions (41, 42, 43, 44) of the divided anode (4), which is situated opposite the side of the strip not to be coated, are actuated selectively either in a potential-free manner or with identical or different, positive or negative potentials at the strip portion situated opposite the respective anode portion.
- Method according to claim 1, characterised in that, when the inlet portions (41, 42, 43) of the divided anode (4) are kept free of potential, the portion or portions (44) situated in the outlet region are actuated with a negative voltage potential at the strip portion situated opposite the respective anode portion such that the effected coating is removed from the side of the strip not to be coated.
- Method according to claim 1, characterised in that, in proportion to the respective oppositely situated strip portion, small positive potentials are applied to the individual portions of the divided insoluble anode in order to prevent a passivation.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3901807 | 1989-01-21 | ||
DE3901807A DE3901807A1 (en) | 1989-01-21 | 1989-01-21 | DEVICE FOR ELECTROLYTICALLY DEPOSITING METALS ON ONE OR BOTH SIDES OF TAPES |
PCT/DE1990/000035 WO1990008209A1 (en) | 1989-01-21 | 1990-01-20 | Device for electrolytic deposition of metals on one or both sides of strips |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0454710A1 EP0454710A1 (en) | 1991-11-06 |
EP0454710B1 true EP0454710B1 (en) | 1994-11-02 |
Family
ID=6372568
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90901741A Expired - Lifetime EP0454710B1 (en) | 1989-01-21 | 1990-01-20 | Process for electrolytic deposition of metals on one or both sides of strips |
Country Status (8)
Country | Link |
---|---|
US (1) | US5322614A (en) |
EP (1) | EP0454710B1 (en) |
JP (1) | JPH04504444A (en) |
AT (1) | ATE113671T1 (en) |
AU (1) | AU4843090A (en) |
DE (2) | DE3901807A1 (en) |
ES (1) | ES2063958T3 (en) |
WO (1) | WO1990008209A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19510667A1 (en) * | 1995-03-23 | 1996-09-26 | Schloemann Siemag Ag | Separation device for metals from a metal-containing electrolyte |
DE19717489B4 (en) * | 1997-04-25 | 2008-04-10 | Sms Demag Ag | Arrangement for the electrogalvanic metal coating of a strip |
FR2765597B1 (en) * | 1997-07-02 | 1999-09-17 | Kvaerner Metals Clecim | ELECTROLYTIC COATING SYSTEM FOR METAL STRIPS, AND ANODE FOR SUCH A SYSTEM |
JP3423631B2 (en) * | 1998-02-05 | 2003-07-07 | キヤノン株式会社 | Method for forming zinc oxide thin film, method for manufacturing semiconductor element substrate using the same, and method for manufacturing photovoltaic element |
US6039858A (en) | 1998-07-22 | 2000-03-21 | International Business Machines Corporation | Plating process for x-ray mask fabrication |
SE529744C2 (en) | 2005-12-22 | 2007-11-13 | Abb Technology Ag | Device and method of metallic coating and use of the device |
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 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3522166A (en) * | 1967-04-21 | 1970-07-28 | Reynolds Metals Co | Electrical system for anodizing |
US3970537A (en) * | 1973-07-11 | 1976-07-20 | Inland Steel Company | Electrolytic treating apparatus |
US3880725A (en) * | 1974-04-10 | 1975-04-29 | Rca Corp | Predetermined thickness profiles through electroplating |
US4240881A (en) * | 1979-02-02 | 1980-12-23 | Republic Steel Corporation | Electroplating current control |
DE3017079A1 (en) * | 1980-05-03 | 1981-11-05 | Thyssen AG vorm. August Thyssen-Hütte, 4100 Duisburg | DEVICE FOR ELECTROPLATING |
JPS6056099A (en) * | 1983-09-05 | 1985-04-01 | Fuji Photo Film Co Ltd | Method and device for electrolytic treatment |
DE3510592A1 (en) * | 1985-03-23 | 1986-10-02 | Hoesch Stahl AG, 4600 Dortmund | HIGH-SPEED ELECTROLYSIS CELL FOR REFINING BAND-SHAPED GOODS |
JPS63259098A (en) * | 1987-04-15 | 1988-10-26 | Sumitomo Metal Ind Ltd | Method for controlling electric current for plating in continuous electroplating equipment |
JPS6417890A (en) * | 1987-07-13 | 1989-01-20 | Kawasaki Steel Co | Method for controlling electroplating amount |
-
1989
- 1989-01-21 DE DE3901807A patent/DE3901807A1/en active Granted
-
1990
- 1990-01-20 WO PCT/DE1990/000035 patent/WO1990008209A1/en active IP Right Grant
- 1990-01-20 AU AU48430/90A patent/AU4843090A/en not_active Abandoned
- 1990-01-20 ES ES90901741T patent/ES2063958T3/en not_active Expired - Lifetime
- 1990-01-20 DE DE59007643T patent/DE59007643D1/en not_active Expired - Fee Related
- 1990-01-20 JP JP2501939A patent/JPH04504444A/en active Pending
- 1990-01-20 US US07/720,810 patent/US5322614A/en not_active Expired - Fee Related
- 1990-01-20 EP EP90901741A patent/EP0454710B1/en not_active Expired - Lifetime
- 1990-01-20 AT AT90901741T patent/ATE113671T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE59007643D1 (en) | 1994-12-08 |
DE3901807C2 (en) | 1993-08-26 |
AU4843090A (en) | 1990-08-13 |
WO1990008209A1 (en) | 1990-07-26 |
JPH04504444A (en) | 1992-08-06 |
ES2063958T3 (en) | 1995-01-16 |
ATE113671T1 (en) | 1994-11-15 |
US5322614A (en) | 1994-06-21 |
EP0454710A1 (en) | 1991-11-06 |
DE3901807A1 (en) | 1990-07-26 |
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