EP0999295A2 - Arrangement for the electrogalvanic metal coating of strips - Google Patents

Arrangement for the electrogalvanic metal coating of strips Download PDF

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Publication number
EP0999295A2
EP0999295A2 EP99118136A EP99118136A EP0999295A2 EP 0999295 A2 EP0999295 A2 EP 0999295A2 EP 99118136 A EP99118136 A EP 99118136A EP 99118136 A EP99118136 A EP 99118136A EP 0999295 A2 EP0999295 A2 EP 0999295A2
Authority
EP
European Patent Office
Prior art keywords
anode
strip
metal
strips
electrolyte
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.)
Withdrawn
Application number
EP99118136A
Other languages
German (de)
French (fr)
Other versions
EP0999295A3 (en
Inventor
Werner Dipl.-Ing. Schimion
Thomas Dipl.-Ing. Folke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
SMS Demag AG
Schloemann Siemag AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE1998148876 external-priority patent/DE19848876A1/en
Application filed by SMS Schloemann Siemag AG, SMS Demag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Publication of EP0999295A2 publication Critical patent/EP0999295A2/en
Publication of EP0999295A3 publication Critical patent/EP0999295A3/en
Withdrawn legal-status Critical Current

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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
    • 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 tapes by a metal enriched acidic electrolytes run with at least one parallel to the band arranged insoluble anode, from which the current to as a cathode switched band flows, leaving metal from the electrolyte on the surface of the strip is deposited, with each anode parallel to the direction of the Band is divided into anode strips, the anode strips isolated from each other are and each anode strip individually with current to deposit the metal is supplied to the electrolyte.
  • the anodes of such arrangements are wider than any in the Arrangement of tape to be coated.
  • Anode strips run the risk of hydrogen corrosion. This applies especially for those directly adjacent to those supplied with electricity Anode strips on which there is a cathodic and anodic area trains. Hydrogen is formed in the cathodic region, which in particular titanium anode strips penetrate.
  • the invention is therefore based on the object of proposing measures that prevent the risk of corrosion on switched off anode strips.
  • the invention proposes that at a Arrangement of the type mentioned at the beginning of each anode strip Has protective power supply, the voltage is such that the Formation of cathodic areas on anode strips is excluded, their power supply for separating the metal from the electrolyte is interrupted.
  • the protective power supply means that none of the anodes form more cathodic areas.
  • the protective current is so too for this dimensioned that the switched off anodes practically no metal deposits cause, in particular, it does not lead to edge growth on the belt is coming.
  • the level of the protective current is about 3% - 10% of the amount of current for the deposition of the metal.
  • the protective power supply can be removed with little technical effort build up electrical resistances, each adjacent anode strip connect with each other.
  • There is an additional advantage to this simple solution in the fact that even the more distant ones do not use electricity to separate the Metal supplied anode strips receive a protective current that is at a distance to the last anode strip supplied with current for the deposition of metal decreases. This decrease corresponds to the decrease in the voltage gradients and thus the requirement to let the lowest possible protective current escape.
  • the arrangement of Figure 1 consists of individual anode strips 5a, 5b are arranged both above and below a band 2.
  • the individual anode strips 5a, 5b are mutually isolated by insulating strips 6a, 6b isolated in the direction of an electrolyte 1 over the surface of the through the Protruding strips 5a, 5b formed anodes.
  • each individual anode strip 5 is over each its own switch 8 with one not shown in the figures Rectifier connected to him using a current to deposit metal supplies the electrolyte 1 to the surface of the strip 2 (deposition current).
  • FIG. 2 shows how the protective power supply is constructed via electrical resistors 11, which connect adjacent anode strips 5 to one another.
  • the anode strips 5 lying further outside, which are not subjected to a deposition current, are also protected against any corrosion damage.
  • Reference list No. description 1. electrolyte 2nd tape 3rd - 4th - 5a, b Anode strips 6a, b Insulating strips 7. - 8th. switch 9. - 10th - 11. Resistances

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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)
  • Prevention Of Electric Corrosion (AREA)

Abstract

Each anode strip has a protective current supply whose voltage is measured so that the production of cathodic regions is excluded on the anode strips. The current supply is interrupted to deposit the metal from the electrolyte. Apparatus for the electrogalvanic metal coating of strips running through an acidic electrolyte enriched with metal has an insoluble anode arranged parallel to the strip from which the current flows to the strip connected as cathode. Metal is deposited from the electrolyte on the surface of the strip and each anode is divided into anode strips parallel to the running direction of the strip. The anode strips are insulated from each other and each strip is provided with a current to deposit the metal from the electrolyte.

Description

Die Erfindung betrifft eine Ausbildung einer 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, bei der jede Anode parallel zur Laufrichtung des Bandes in Anodenstreifen geteilt ist, die Anodenstreifen gegeneinander isoliert sind und jeder Anodenstreifen einzeln mit Strom zum Abscheiden des Metalls aus dem Elektrolyten versorgt ist.The invention relates to an arrangement for electro-galvanic Metal coating of tapes by a metal enriched acidic electrolytes run with at least one parallel to the band arranged insoluble anode, from which the current to as a cathode switched band flows, leaving metal from the electrolyte on the surface of the strip is deposited, with each anode parallel to the direction of the Band is divided into anode strips, the anode strips isolated from each other are and each anode strip individually with current to deposit the metal is supplied to the electrolyte.

Üblicherweise sind die Anoden derartiger Anordnungen breiter als jedes in der Anordnung zu beschichtende Band. Zur Metallbeschichtung des Bandes werden regelmäßig nur diejenigen Anodenstreifen mit Strom versorgt, die sich unterhalb oder oberhalb des Bandes befinden. An den nicht mit Strom versorgten Anodenstreifen besteht die Gefahr einer Wasserstoffkorrosion. Dies gilt insbesondere für die unmittelbar zu den mit Strom versorgten benachbarten Anodenstreifen, auf denen sich ein kathodischer und anodischer Bereich ausbildet. In dem kathodischen Bereich wird Wasserstoff gebildet, der in die insbesondere aus Titan bestehenden Anodenstreifen eindringt.Typically, the anodes of such arrangements are wider than any in the Arrangement of tape to be coated. For the metal coating of the tape Regularly only powered those anode strips that are below or above the belt. On those not supplied with electricity Anode strips run the risk of hydrogen corrosion. this applies especially for those directly adjacent to those supplied with electricity Anode strips on which there is a cathodic and anodic area trains. Hydrogen is formed in the cathodic region, which in particular titanium anode strips penetrate.

Der Erfindung liegt daher die Aufgabe zugrunde, Maßnahmen vorzuschlagen, die die Gefahr einer Korrosion an abgeschalteten Anodenstreifen verhindern. The invention is therefore based on the object of proposing measures that prevent the risk of corrosion on switched off anode strips.

Zur Lösung dieser Aufgabe wird erfindungsgemäß vorgeschlagen, daß bei einer Anordnung der eingangs erwähnten Art jeder Anodenstreifen eine Schutzstromversorgung besitzt, deren Spannung so bemessen ist, daß die Entstehung von kathodischen Bereichen auf Anodenstreifen ausgeschlossen ist, deren Stromversorgung zum Abscheiden des Metalls aus dem Elektrolyten unterbrochen ist.To solve this problem, the invention proposes that at a Arrangement of the type mentioned at the beginning of each anode strip Has protective power supply, the voltage is such that the Formation of cathodic areas on anode strips is excluded, their power supply for separating the metal from the electrolyte is interrupted.

Die Schutzstromversorgung bewirkt, daß sich an sämtlichen Anoden keine kathodischen Bereiche mehr ausbilden. Der Schutzstrom ist hierfür so zu bemessen, daß die abgeschalteten Anoden praktisch keine Metallabscheidungen hervorrufen, es insbesondere nicht zu Kantenaufwachsungen an dem Band kommt. Um dieser Forderung zu genügen, beträgt die Höhe des Schutzstroms etwa 3 % - 10 % der Höhe des Stromes für das Abscheiden des Metalls.The protective power supply means that none of the anodes form more cathodic areas. The protective current is so too for this dimensioned that the switched off anodes practically no metal deposits cause, in particular, it does not lead to edge growth on the belt is coming. In order to meet this requirement, the level of the protective current is about 3% - 10% of the amount of current for the deposition of the metal.

Mit geringem technischen Aufwand läßt sich die Schutzstromversorgung aus elektrischen Widerständen aufbauen, die jeweils benachbarte Anodenstreifen miteinander verbinden. Ein zusätzlicher Vorteil dieser einfachen Lösung besteht darin, daß auch die weiter entfernten, nicht mit Strom zum Abscheiden des Metalls versorgten Anodenstreifen einen Schutzstrom erhalten, der mit Abstand zum letzten mit Strom zum Abscheiden von Metall versorgten Anodenstreifen abnimmt. Diese Abnahme entspricht der Abnahme der Spannungsgradienten und damit der Forderung, einen möglichst geringen Schutzstrom austreten zu lassen. The protective power supply can be removed with little technical effort build up electrical resistances, each adjacent anode strip connect with each other. There is an additional advantage to this simple solution in the fact that even the more distant ones do not use electricity to separate the Metal supplied anode strips receive a protective current that is at a distance to the last anode strip supplied with current for the deposition of metal decreases. This decrease corresponds to the decrease in the voltage gradients and thus the requirement to let the lowest possible protective current escape.

Nachfolgend wird die Erfindung anhand von Prinzipzeichnungen näher erläutert:The invention is explained in more detail below on the basis of principle drawings:

Es zeigen:

Figur 1:
Die Ausbildung des elektrischen Feldes an einer Anordnung sowie
Figur 2:
ein Beispiel einer Schutzstromversorgung für eine derartige Anordnung.
Show it:
Figure 1:
The formation of the electric field on an arrangement as well
Figure 2:
an example of a protective power supply for such an arrangement.

Die Anordnung nach Figur 1 besteht aus einzelnen Anodenstreifen 5a, 5b, die sowohl oberhalb als auch unterhalb eines Bandes 2 angeordnet sind. Die einzelnen Anodenstreifen 5a, 5b sind durch Isolierstreifen 6a, 6b gegeneinander isoliert, die in Richtung eines Elektrolyten 1 über die Oberfläche der durch die Streifen 5a, 5b gebildeten Anoden hinausragen.The arrangement of Figure 1 consists of individual anode strips 5a, 5b are arranged both above and below a band 2. The individual anode strips 5a, 5b are mutually isolated by insulating strips 6a, 6b isolated in the direction of an electrolyte 1 over the surface of the through the Protruding strips 5a, 5b formed anodes.

Wie aus Figur 2 ersichtlich, wird jeder einzelne Anodenstreifen 5 über jeweils einen eigenen Schalter 8 mit einem in den Figuren nicht dargestellten Gleichrichter verbunden, der ihn mit einem Strom zum Abscheiden von Metall aus den Elektrolyten 1 auf die Oberfläche des Bandes 2 versorgt (Abscheidestrom).As can be seen from Figure 2, each individual anode strip 5 is over each its own switch 8 with one not shown in the figures Rectifier connected to him using a current to deposit metal supplies the electrolyte 1 to the surface of the strip 2 (deposition current).

In Figur 2 ist erkennbar, daß lediglich drei Schalter 8 geschlossen sind. Hierbei handelt es sich um Schalter, die solchen Anodenstreifen 5 zugeordnet sind, die sich gegenüber der in Figur 2 nicht dargestellten Oberfläche des Bandes 2 befinden. An den benachbarten Anodenstreifen 5, deren Schalter 8 geöffnet sind, kommt es ohne die erfindungsgemäße Schutzstromversorgung zu den in Figur 1 dargestellten Stromüberschritten von dem letzten mit dem Abscheidestrom beaufschlagten Anodenstreifen auf den ersten, benachbarten und nicht mit Abscheidestrom beaufschlagten Anodenstreifen 5. Hierdurch bildet sich auf dem Anodenstreifen 5 ein kathodischer und ein anodischer Bereich aus. Auf dem kathodischen Bereich wird Wasserstoff gebildet, der in die aus Titan bestehenden Anodenstreifen eindringen kann und zu Korrosionsschäden führt. Grundsätzlich kann es zur Ausbildung dieser kathodischen und anodischen Bereiche auf sämtlichen nicht mit Abscheidestrom beaufschlagten Anodenstreifen kommen, allerdings ist in der Praxis der unmittelbar benachbarte Anodenstreifen 5, der dem größten Spannungsgradienten ausgeliefert ist, am ehesten betroffen.In Figure 2 it can be seen that only three switches 8 are closed. Here are switches that are associated with such anode strips 5, the are located opposite the surface of the belt 2, which is not shown in FIG. On the adjacent anode strips 5, the switches 8 of which are open, Without the protective power supply according to the invention, the situation in FIG. 1 occurs current exceeded shown from the last with the separation current loaded anode strips on the first, adjacent and not with Deposition current applied to the anode strip 5. This forms on the Anode strips 5 a cathodic and an anodic area. On the Hydrogen is formed in the cathodic area, which is made up of titanium Anode strips can penetrate and lead to corrosion damage. Basically it can lead to the formation of these cathodic and anodic areas all of the anode strips not subjected to the deposition current come in practice, however, is the immediately adjacent anode strip 5, which greatest voltage gradient is most likely to be affected.

Aus Figur 2 ist nun weiter erkennbar, wie die Schutzstromversorgung über elektrische Widerstände 11 aufgebaut ist, die jeweils benachbarte Anodenstreifen 5 miteinander verbinden. Durch die sich hieraus ergebende Hintereinanderschaltung der Widerstände 11 erfahren auch die weiter außen liegenden Anodenstreifen 5, die nicht mit einem Abscheidestrom beaufschlagt sind, einen Schutz gegen etwaige Korrosionsschäden. Bezugszeichenliste Nr. Bezeichnung 1. Elektrolyt 2. Band 3. - 4. - 5a, b Anodenstreifen 6a, b Isolierstreifen 7. - 8. Schalter 9. - 10. - 11. Widerstände FIG. 2 shows how the protective power supply is constructed via electrical resistors 11, which connect adjacent anode strips 5 to one another. As a result of the series connection of the resistors 11, the anode strips 5 lying further outside, which are not subjected to a deposition current, are also protected against any corrosion damage. Reference list No. description 1. electrolyte 2nd tape 3rd - 4th - 5a, b Anode strips 6a, b Insulating strips 7. - 8th. switch 9. - 10th - 11. Resistances

Claims (5)

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, bei der jede Anode parallel zur Laufrichtung des Bandes in Anodenstreifen geteilt ist, die Anodenstreifen gegeneinander isoliert sind und jeder Anodenstreifen einzeln mit Strom zum Abscheiden des Metalls aus dem Elektrolyten versorgt ist,
dadurch gekennzeichnet,
daß jeder Anodenstreifen (5a, 5b) eine Schutzstromversorgung besitzt, deren Spannung so bemessen ist, daß die Entstehung von kathodischen Bereichen auf Anodenstreifen ausgeschlossen ist, deren Stromversorgung zum Abscheiden des Metalls aus dem Elektrolyten (1) unterbrochen ist.Arrangement for electrogalvanic metal coating of strips which run through a metal-enriched acidic electrolyte, with at least one insoluble anode arranged parallel to the strip, from which the current flows to the strip connected as cathode, metal being deposited from the electrolyte on the surface of the strip in which each anode is divided into anode strips parallel to the running direction of the strip, the anode strips are insulated from one another and each anode strip is individually supplied with current for separating the metal from the electrolyte,
characterized,
that each anode strip (5a, 5b) has a protective power supply, the voltage of which is dimensioned such that the formation of cathodic areas on anode strips is ruled out, the power supply of which is interrupted to separate the metal from the electrolyte (1). Anordnung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Schutzstromversorgung aus elektrischen Widerständen (11) besteht, die jeweils benachbarte Anodenstreifen (5a, 5b) miteinander verbinden. Arrangement according to claim 1,
characterized by
that the protective power supply consists of electrical resistors (11), which connect adjacent anode strips (5a, 5b) to each other. Anordnung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Schutzstromversorgung über mindestens einen jedem Anodenstreifen (5a, 5b) zugeordneten Schalter erfolgt.Arrangement according to claim 1,
characterized by
that the protective power supply takes place via at least one switch assigned to each anode strip (5a, 5b). Anordnung nach Anspruch 3,
dadurch gekennzeichnet,
daß die als Schütze ausgebildeten Schalter mit mindestens einer Spannungsquelle ausschließlich zur Erzeugung des Schutzstromes verbunden sind.Arrangement according to claim 3,
characterized by
that the switches designed as contactors are connected to at least one voltage source exclusively for generating the protective current. Anordnung nach Anspruch 1,
dadurch gekennzeichnet,
daß jeder Anodenstreiten (5a, 5b) einzeln mit einem Stromregler eines Gleichrichters verbunden ist, dessen Regelbereich eine Beaufschlagung der Anode sowohl mit dem Schutzstrom als auch mit dem Strom zum Abscheiden des Metalls aus dem Elektrolyten auf der Oberfläche des Bandes erlaubt.Arrangement according to claim 1,
characterized by
that each anode streak (5a, 5b) is individually connected to a current regulator of a rectifier, the control range of which allows the anode to be supplied with both the protective current and the current for depositing the metal from the electrolyte on the surface of the strip.
EP99118136A 1998-10-23 1999-09-11 Arrangement for the electrogalvanic metal coating of strips Withdrawn EP0999295A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19848876 1998-10-23
DE1998148876 DE19848876A1 (en) 1997-04-25 1998-10-23 Apparatus for the electrogalvanic metal coating of strips running through an acidic electrolyte enriched with metal has anode strips with protective current supply

Publications (2)

Publication Number Publication Date
EP0999295A2 true EP0999295A2 (en) 2000-05-10
EP0999295A3 EP0999295A3 (en) 2006-05-17

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EP99118136A Withdrawn EP0999295A3 (en) 1998-10-23 1999-09-11 Arrangement for the electrogalvanic metal coating of strips

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US (1) US6589400B1 (en)
EP (1) EP0999295A3 (en)
JP (1) JP4405005B2 (en)
KR (1) KR20000029143A (en)
CN (2) CN1252458A (en)
BR (1) BR9906119A (en)
RU (1) RU2228395C2 (en)
UA (1) UA57783C2 (en)

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US9180599B2 (en) * 2004-09-08 2015-11-10 Bic-Violex S.A. Method of deposition of a layer on a razor blade edge and razor blade
US8815073B2 (en) * 2007-03-28 2014-08-26 Toray Industries, Inc. Web pressure welding method, pressure welding device, power supply method, power supply device, continuous electrolytic plating apparatus and method for manufacturing web with plated coating film
CN103741124A (en) * 2014-01-24 2014-04-23 广东保迪环保电镀设备有限公司 Novel stainless steel chemical nickel plating tank
JP7079224B2 (en) * 2019-06-14 2022-06-01 株式会社荏原製作所 Non-volatile storage medium for storing plating methods, plating equipment, and programs

Citations (1)

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US5156730A (en) * 1991-06-25 1992-10-20 International Business Machines Electrode array and use thereof

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US4240881A (en) * 1979-02-02 1980-12-23 Republic Steel Corporation Electroplating current control
FR2542766B1 (en) * 1983-03-16 1987-07-03 Cegedur METHOD AND DEVICE FOR ELECTROCHEMICAL TREATMENT OF THE SURFACE OF METALLIC PRODUCTS OF ELONGATE FORM
JPS6056099A (en) * 1983-09-05 1985-04-01 Fuji Photo Film Co Ltd Method and device for electrolytic treatment
JPS6067699A (en) * 1983-09-21 1985-04-18 Fuji Photo Film Co Ltd Electrolytic treatment
GB8911566D0 (en) * 1989-05-19 1989-07-05 Sun Ind Coatings Plating system
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CN1252458A (en) 2000-05-10
JP2000129497A (en) 2000-05-09
US6589400B1 (en) 2003-07-08
CN101575722A (en) 2009-11-11
EP0999295A3 (en) 2006-05-17
JP4405005B2 (en) 2010-01-27
RU2228395C2 (en) 2004-05-10
UA57783C2 (en) 2003-07-15
KR20000029143A (en) 2000-05-25
BR9906119A (en) 2001-01-16

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