EP0538081B1 - Verbessertes Verfahren zur Elektroplattierung eines Metallbleches - Google Patents

Verbessertes Verfahren zur Elektroplattierung eines Metallbleches Download PDF

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Publication number
EP0538081B1
EP0538081B1 EP92402525A EP92402525A EP0538081B1 EP 0538081 B1 EP0538081 B1 EP 0538081B1 EP 92402525 A EP92402525 A EP 92402525A EP 92402525 A EP92402525 A EP 92402525A EP 0538081 B1 EP0538081 B1 EP 0538081B1
Authority
EP
European Patent Office
Prior art keywords
strip
current
metal
process according
phase
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
Application number
EP92402525A
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English (en)
French (fr)
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EP0538081A1 (de
Inventor
Isabelle Marolleau
Jean-Denis Girardier
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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Application filed by Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0538081A1 publication Critical patent/EP0538081A1/de
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Anticipated expiration legal-status Critical
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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
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/12—Process control or regulation
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/22—Electroplating: Baths therefor from solutions of zinc
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • 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
    • C25D7/0657—Conducting rolls

Definitions

  • the present invention relates to an improved process for electroplating a metal strip. It applies in particular to the formation of a coating or deposit of zinc on a strip.
  • the supply current of the electrolytic cell is adjusted so as to obtain, at the surface of the strip, a current density lower than the abovementioned limit value.
  • operations are carried out to prepare the strip, in particular comprising a degreasing operation.
  • the current density can reach or even exceed the diffusion limit current by causing the phenomenon mentioned above of hydrogen adsorption and fixing of zinc hydroxide on the surface of the strip.
  • the object of the invention is in particular to form an electrolytic deposit of metal on the surface of a flat product or strip whose adhesion and cohesion are of good quality and do not degrade, for example, during a treatment steaming.
  • the subject of the invention is a process for electroplating a metal strip, of the type in which the strip is made to run in a bath of at least one electrolytic cell containing a solution of ions of a metal to depositing on the strip and comprising electrically conductive rollers, forming a cathode, in contact with said strip and at least one anode placed near each roll, each pair of conductive rollers and anode being supplied by an adjustable electric current I whose density J to the surface of the sheet can reach or exceed a value called the diffusion limit current Jl of the ions, characterized in that the deposition is carried out in two phases, by adjusting the current I of a first and a second series of couples conductive-anode roller so that, on the one hand, during the two phases, the mean value Jm of the current density at the surface of the strip is less than the diffusion limit current Jl and, on the other hand, at during the first phase, the local value of the current density J, at any point on the surface of the strip, is less
  • the first metal deposition phase corresponds to the passage of the strip in a first conductive roller-anode pair of a first electrolytic cell.
  • the first metal deposition phase corresponds to the passage of the strip in the first two conductor-anode roller pairs of a first electrolytic cell.
  • the electroplating process according to the invention is applied to the formation of a zinc coating, with a thickness of approximately 20 ⁇ m, on a metal strip.
  • This particular application of the process is commonly called electrogalvanizing.
  • the zinc coating is formed in two stages. During the first stage, a layer of zinc 5 »m thick is deposited and during the second stage, a layer of zinc is deposited 15» m thick.
  • the strip travels at a speed V of between 40 and 180 m / min in a bath of at least one electrolytic cell, containing zinc ions to be deposited on the strip.
  • the electrolytic cell comprises electrically conductive rollers, forming a cathode, in contact with the metal strip, and at least one anode placed near each roller.
  • Each pair of conductive roller and anode is supplied by an electric current of appropriate intensity I.
  • the coating metal contained in the bath is transported in the electrolyte by the electrolysis current between the anodes and the strip brought to a cathodic potential by the electrically conductive rollers.
  • the electrolysis current has a density J, at the surface of the strip, which can reach, or even exceed, the limit current Jl of diffusion of the zinc ions to be deposited.
  • the supply current of the electrolytic cell is adjusted so that the average value Jm of the current density at the surface of the strip is less than the limit current J1.
  • the current of a first series of conductive roller-anode pairs is adjusted so that the current density J at the surface of the strip is at any point thereof less than the current limit Jl, in order to avoid the appearance, on the surface of the strip, of overcurrents of a value greater than the limit current Jl.
  • This condition, as well as the previous one, are notably fulfilled when the mean value Jm of the density of current checks the relation: 10% Jl ⁇ Jm ⁇ 40% Jl.
  • a first deposit of zinc with a thickness of 5 "m is carried out.
  • the first zinc deposition step can be carried out, for example by passing the strip through a first pair of conductive roller-anode supplied by a current adjusted according to the conditions just described or by passing the strip through the first two conductor-anode roller pairs supplied with a current adjusted according to these same conditions.
  • a second deposit of zinc is made on the first to complete the zinc coating to the desired thickness of 20 ”m.
  • This second deposit is formed by adjusting the current of a second series of conductor-anode roller pairs, so that its average density Jm at the surface of the strip is higher than at the first step and lower than the limit current Jl.
  • the two successive phases of the process can also be carried out in two electrolytic cells arranged in series and the two phases of the process can be linked continuously or discontinuously.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Automation & Control Theory (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Coating With Molten Metal (AREA)
  • Laser Beam Processing (AREA)
  • Physical Vapour Deposition (AREA)

Claims (9)

  1. Verfahren zur Elektroplattierung eines Metallbleches, bei dem das Blech durch ein Bad mit mindestens einer Elektrolysezelle bewegt wird, die eine Lösung von Ionen des auf das Blech aufzubringenden Metalls enthält und die elektrisch leitenden Walzen, die die Kathode bilden und am Blech anliegen, und mindestens eine in der Nähe von jeder Walze angeordnete Anode aufweist, wobei jedes Paar aus leitender Walze und Anode mit einem regelbaren elektrischen Strom I gespeist wird, dessen Dichte J an der Oberfläche des Blechmaterials einen Wert erreichen oder überschreiten kann, der als Diffusionsgrenzstrom Jl der Ionen bezeichnet wird, dadurch gekennzeichnet, daß die Aufbringung in zwei Phasen erfolgt, indem der Strom I in einer ersten und einer zweiten Anzahl von Paaren aus leitender Walze und Anode derart geregelt wird, daß einerseits im Verlauf der beiden Phasen der Mittelwert Jm der Stromdichte an der Oberfläche des Bleches unter dem Diffusionsgrenzstrom Jl liegt und andererseits im Verlauf der ersten Phase der lokale Wert der Stromdichte J an jedem Ort der Oberfläche des Bleches unter dem Diffusionsgrenzstrom Jl liegt.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die zweite Phase der Aufbringung des Metalls erfolgt, indem der Strom I in der zweiten Anzahl von Paaren aus leitender Walze und Anode derart geregelt wird, um einen Mittelwert Jm der Stromdichte zu erhalten, der über dem Mittelwert der Stromdichte liegt, die zum Erzeugen der ersten Aufbringung verwendet wird.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß während der ersten Phase der Aufbringung des Metalls der Strom I in der ersten Anzahl von Paaren aus leitender Walze und Anode derart geregelt wird, daß der Mittelwert Jm der Stromdichte an der Oberfläche des Bleches der folgenden Beziehung entspricht: 10% Jl ≦ Jm ≦ 40% Jl.
    Figure imgb0012
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Schicht das während der ersten Aufbringungsphase aufgebrachten Metalls eine Dicke zwischen 4 und 6 »m und vorzugsweise 5 »m aufweist.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß während der zweiten Phase der Metallaufbringung der Strom I der zweiten Anzahl von Paaren aus leitender Walze und Anode derart geregelt wird, daß der Mittelwert Jm der Stromdichte an der Oberfläche des Bleches der folgenden Beziehung entspricht: 50% Jl ≦ Jm ≦ 90% Jl.
    Figure imgb0013
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die erste Phase der Metallaufbringung dem Durchlaufen des Bleches entlang eines ersten Paares aus leitender Walze und Anode einer ersten Elektrolysezelle entspricht.
  7. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die erste Phase der Metallaufbringung dem Durchlaufen des Bleches entlang der beiden ersten Paare aus leitender Walze und Anode einer ersten Elektrolysezelle entspricht.
  8. Verfahren nach einem dar vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Durchlaufgeschwindigkeit V des Bleches im Verlauf der beiden Phasen der Metallaufbringung genau die gleiche ist.
  9. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das auf das Blech aufgebrachte Metall Zink ist.
EP92402525A 1991-10-16 1992-09-15 Verbessertes Verfahren zur Elektroplattierung eines Metallbleches Expired - Lifetime EP0538081B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9112770 1991-10-16
FR9112770A FR2682691B1 (fr) 1991-10-16 1991-10-16 Procede perfectionne de galvanoplastie d'une bande metallique.

Publications (2)

Publication Number Publication Date
EP0538081A1 EP0538081A1 (de) 1993-04-21
EP0538081B1 true EP0538081B1 (de) 1995-12-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92402525A Expired - Lifetime EP0538081B1 (de) 1991-10-16 1992-09-15 Verbessertes Verfahren zur Elektroplattierung eines Metallbleches

Country Status (8)

Country Link
US (1) US5344552A (de)
EP (1) EP0538081B1 (de)
JP (1) JPH05214587A (de)
KR (1) KR930008196A (de)
AT (1) ATE131222T1 (de)
DE (1) DE69206573T2 (de)
ES (1) ES2081590T3 (de)
FR (1) FR2682691B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2732365B1 (fr) * 1995-03-29 1997-04-30 Lorraine Laminage Procede continu d'electrozingage de bande metallique dans un bain d'electrolyse a base de chlorures pour obtenir des revetements de faible rugosite sous des densites de courant elevees
FR2765247B1 (fr) * 1997-06-26 1999-07-30 Lorraine Laminage Bain aqueux d'electrodeposition a base de chlorures pour la preparation d'un revetement a base de zinc ou d'alliage de zinc
KR100487279B1 (ko) * 2002-07-16 2005-05-03 현대모비스 주식회사 아연-철 합금 도금 강판제조방법

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2460347A1 (fr) * 1979-06-29 1981-01-23 Thomson Csf Procede de metallisation directe d'un substrat conducteur par galvanoplastie et substrat conducteur comportant une telle metallisation
JPS61170595A (ja) * 1985-01-24 1986-08-01 Nippon Steel Corp 電気亜鉛めつき鋼板の製造方法
JP2675152B2 (ja) * 1989-08-11 1997-11-12 川崎製鉄株式会社 めっき密着性に優れたＺｎ‐Ｎｉ合金電気めっき鋼板の製造方法

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Publication number Publication date
FR2682691A1 (fr) 1993-04-23
KR930008196A (ko) 1993-05-21
ES2081590T3 (es) 1996-03-16
FR2682691B1 (fr) 1994-01-14
JPH05214587A (ja) 1993-08-24
US5344552A (en) 1994-09-06
DE69206573D1 (de) 1996-01-18
DE69206573T2 (de) 1996-05-02
ATE131222T1 (de) 1995-12-15
EP0538081A1 (de) 1993-04-21

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