EP0538095A1 - Process for zinc electroplating on a metal strip - Google Patents

Process for zinc electroplating on a metal strip Download PDF

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Publication number
EP0538095A1
EP0538095A1 EP92402715A EP92402715A EP0538095A1 EP 0538095 A1 EP0538095 A1 EP 0538095A1 EP 92402715 A EP92402715 A EP 92402715A EP 92402715 A EP92402715 A EP 92402715A EP 0538095 A1 EP0538095 A1 EP 0538095A1
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EP
European Patent Office
Prior art keywords
anode
strip
intensity
roller
series
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
Application number
EP92402715A
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German (de)
French (fr)
Other versions
EP0538095B1 (en
Inventor
Alain Lerouge
Jacques Keller
Jean-Paul Allemand
Richard Girowski
Daniel Balland
Michel Lovato
Alain Popadenec
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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Publication of EP0538095A1 publication Critical patent/EP0538095A1/en
Application granted granted Critical
Publication of EP0538095B1 publication Critical patent/EP0538095B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils

Definitions

  • the present invention relates to a method for electrogalvanizing a metal strip.
  • the electrolytic cell or cells comprise electrically conductive rollers, forming a cathode, in contact with the metal strip and at least one anode placed opposite each roller. Each conductor-anode roller pair is supplied with electric current.
  • 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 conditions for the formation of the zinc deposit depend in particular on the intensity of the electric current supplying the conductor-anode roller pairs of the electrolytic cell or cells.
  • the object of the present invention is in particular to reduce the roughness of the strip, while forming an electrolytic deposit of metal on the surface of a strip whose adhesion and cohesion are of good quality.
  • the subject of the present invention is a method of electrogalvanizing a metal strip, of the type in which the strip is made to run in at least one electrolytic cell containing an ion bath to be deposited on the strip and comprising electrically conductive rollers, forming a cathode, in contact with said strip and at least one anode placed opposite each roller, each pair of conductive roller and anode being supplied with electric current, characterized in that the deposition is carried out by scrolling the strip between a first series of conductive roller-anode couples supplied with current at a first appropriate intensity, then between a second series of conductive roller-anode couples supplied with current at a second intensity comprised between 7.5 and 20% of the first intensity .
  • the electrogalvanizing process according to the invention is applied to the formation of zinc, of a thickness of approximately 10 microns on a metal strip.
  • the metal strip travels at a speed of between 40 and 180 m / min in a bath of at least one electrolytic cell, containing zinc ions to be deposited on said strip.
  • the electrolytic cell comprises electrically conductive rollers, forming a cathode, in contact with the metal strip, and at least one anode placed opposite each roller.
  • Each conductor-anode roller pair is supplied with electric current of appropriate intensity.
  • 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 method according to the invention consists in carrying out the deposition by passing the strip between a first series of conductive roller-anode couples supplied with current at a suitable first intensity, generally greater than 50 A / dm2, then between a second series of couples of conductive-anode rollers supplied with current at a second intensity of between 7.5 and 20% of the first intensity.
  • This second intensity is between 5 and 15 A / dm2 and preferably equal to 10 A / dm2.
  • a zinc deposit is made on the metal strip whose thickness is slightly less than the total thickness of the coating to be obtained, then during a second step corresponding to the second series of conductive roller-anode couples, we deposits a very thin zinc on the order of 0.05 to 0.5 microns, preferably 0.2 microns, to obtain the total thickness of the coating.
  • the second series of conductor-anode roller pairs corresponds to the last or the last two conductor-anode roller couples of the last electrolytic cell.
  • Arithmetic roughness measurements were carried out using a roughness tester on bare sheets, coated sheets without applying the method according to the invention and coated sheets according to the described method.
  • the two successive stages of the process can be carried out in several electrolytic cells arranged in series.

Landscapes

  • 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)
  • Coating With Molten Metal (AREA)
  • Electrolytic Production Of Metals (AREA)

Abstract

Process for electroplating a metal strip with zinc, of the type in which the strip passes through at least one electrolysis cell comprising a bath of ions to be deposited onto the strip and comprising electrically conductive rollers forming a cathode in contact with the said strip and at least one anode placed facing each roller. Each conductive roller-anode pair is supplied with electrical current. The deposition is performed by passing the strip between a first series of conductive roller-anode pairs supplied with current at an appropriate first intensity, then between a second series of conductive roller-anode pairs supplied with current at a second intensity of between 7.5 and 20 % of the first intensity.

Description

La présente invention concerne un procédé d'électrozingage d'une bande métallique.The present invention relates to a method for electrogalvanizing a metal strip.

Elle s'applique en particulier à la formation d'un revêtement ou dépôt de zinc sur une bande métallique.It applies in particular to the formation of a coating or deposit of zinc on a metal strip.

Il est connu de former un revêtement de zinc sur une bande métallique en faisant défiler celle-ci à grande vitesse dans au moins une cellule électrolytique contenant un bain d'ions à déposer sur ladite bande. La ou les cellules électrolytiques comprennent des rouleaux conducteurs électriques, formant cathode, en contact avec la bande métallique et au moins une anode placée en regard de chaque rouleau. Chaque couple rouleau conducteur-anode est alimenté en courant électrique.It is known to form a zinc coating on a metal strip by scrolling the latter at high speed in at least one electrolytic cell containing an ion bath to be deposited on said strip. The electrolytic cell or cells comprise electrically conductive rollers, forming a cathode, in contact with the metal strip and at least one anode placed opposite each roller. Each conductor-anode roller pair is supplied with electric current.

Le métal de revêtement contenu dans le bain est transporté dans l'électrolyte par le courant d'électrolyse entre les anodes et la bande portée à un potentiel cathodique par les rouleaux conducteurs électriques.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.

Les conditions de formation du dépôt de zinc dépendent en particulier de l'intensité du courant électrique alimentant les couples rouleau conducteur-anode de la ou des cellules électrolytiques.The conditions for the formation of the zinc deposit depend in particular on the intensity of the electric current supplying the conductor-anode roller pairs of the electrolytic cell or cells.

Jusqu'à présent, l'ensemble des couples rouleau conducteur-anode de ou des cellules électrolytiques est alimenté par un courant électrique dont l'intensité est généralement la même pour tous les couples, la plus élevée possible, supérieure à 50 A/dm².Up to now, all of the conductor-anode roller pairs of electrolytic cells have been supplied by an electric current whose intensity is generally the same for all couples, the highest possible, greater than 50 A / dm².

Or, on constate qu'à la fin du dépôt, on obtient une augmentation de la rugosité de la bande traitée qui ne répond plus aux exigences de la clientèle et notamment aux carrossiers pour les pièces extérieures des véhicules.However, it can be seen that at the end of the deposition, an increase in the roughness of the treated strip is obtained, which no longer meets the requirements of the clientele and in particular to body builders for the exterior parts of vehicles.

La présente invention a notamment pour but de diminuer la rugosité de la bande, tout en formant un dépôt électrolytique de métal à la surface d'une bande dont l'adhérence et la cohésion sont de bonne qualité.The object of the present invention is in particular to reduce the roughness of the strip, while forming an electrolytic deposit of metal on the surface of a strip whose adhesion and cohesion are of good quality.

A cet effet, la présente invention a pour objet un procédé de d'électrozingage d'une bande métallique, du type dans lequel on fait défiler la bande dans au moins une cellule électrolytique contenant un bain d'ions à déposer sur la bande et comprenant des rouleaux conducteurs électriques, formant cathode, en contact avec ladite bande et au moins une anode placée en regard de chaque rouleau, chaque couple rouleau conducteur-anode étant alimenté en courant électrique, caractérisé en ce qu'on effectue le dépôt en faisant défiler la bande entre une première série de couples rouleau conducteur-anode alimentés en courant selon une première intensité appropriée, puis entre une seconde série de couples rouleau conducteur-anode alimentés en courant selon une seconde intensité comprise entre 7,5 et 20% de la première intensité.To this end, the subject of the present invention is a method of electrogalvanizing a metal strip, of the type in which the strip is made to run in at least one electrolytic cell containing an ion bath to be deposited on the strip and comprising electrically conductive rollers, forming a cathode, in contact with said strip and at least one anode placed opposite each roller, each pair of conductive roller and anode being supplied with electric current, characterized in that the deposition is carried out by scrolling the strip between a first series of conductive roller-anode couples supplied with current at a first appropriate intensity, then between a second series of conductive roller-anode couples supplied with current at a second intensity comprised between 7.5 and 20% of the first intensity .

Suivant d'autres caractéristiques de l'invention :

  • la seconde intensité est comprise entre 5 et 15 A/dm² et de préférence égale à 10 A/dm²,
  • la seconde série correspond au dernier couple rouleau conducteur-anode de la dernière cellule électrolytique,
  • la seconde série correspond aux deux derniers couples rouleau conducteur-anode de la dernière cellule électrolytique.
  • entre la seconde série de couples de rouleau conducteur-anode, on dépose un revêtement sur la bande métallique dont l'épaisseur est comprise entre 0,05 et 0,5 microns, de préférence égale à 0,2 microns.
According to other characteristics of the invention:
  • the second intensity is between 5 and 15 A / dm² and preferably equal to 10 A / dm²,
  • the second series corresponds to the last conductive roller-anode pair of the last electrolytic cell,
  • the second series corresponds to the last two conductor-anode roller pairs of the last electrolytic cell.
  • between the second series of pairs of conductive roller and anode, a coating is deposited on the metal strip whose thickness is between 0.05 and 0.5 microns, preferably equal to 0.2 microns.

Un exemple de mise en oeuvre du procédé selon l'invention est décrit plus en détails ci-dessous.An example of implementation of the method according to the invention is described in more detail below.

Dans cet exemple, le procédé d'électrozingage selon l'invention est appliqué à la formation de zinc, d'une épaisseur de 10 microns environ sur une bande métallique.In this example, the electrogalvanizing process according to the invention is applied to the formation of zinc, of a thickness of approximately 10 microns on a metal strip.

La bande métallique défile à une vitesse comprise entre 40 et 180 m/mn dans un bain d'au moins une cellule électrolytique, contenant des ions de zinc à déposer sur ladite bande.The metal strip travels at a speed of between 40 and 180 m / min in a bath of at least one electrolytic cell, containing zinc ions to be deposited on said strip.

De manière classique, la cellule électrolytique comprend des rouleaux conducteurs électriques, formant cathode, en contact avec la bande métallique, et au moins une anode placée en regard de chaque rouleau. Chaque couple rouleau conducteur-anode est alimenté en courant électrique d'intensité appropriée.Conventionally, the electrolytic cell comprises electrically conductive rollers, forming a cathode, in contact with the metal strip, and at least one anode placed opposite each roller. Each conductor-anode roller pair is supplied with electric current of appropriate intensity.

Le métal de revêtement contenu dans le bain est transporté dans l'électrolyte par le courant d'électrolyse entre les anodes et la bande portée à un potentiel cathodique par les rouleaux conducteurs électriques.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.

Le procédé selon l'invention consiste à effectuer le dépôt en faisant défiler la bande entre une première série de couples rouleau conducteur-anode alimentés en courant selon une première intensité appropriée, généralement supérieure à 50 A/dm², puis entre une seconde série de couples de rouleau conducteur-anode alimentés en courant selon une seconde intensité comprise entre 7,5 et 20% de la première intensité.The method according to the invention consists in carrying out the deposition by passing the strip between a first series of conductive roller-anode couples supplied with current at a suitable first intensity, generally greater than 50 A / dm², then between a second series of couples of conductive-anode rollers supplied with current at a second intensity of between 7.5 and 20% of the first intensity.

Cette seconde intensité est comprise entre 5 et 15 A/dm² et de préférence égale à 10 A/dm².This second intensity is between 5 and 15 A / dm² and preferably equal to 10 A / dm².

Ainsi, au cours d'une première étape du procédé correspondant à la première série de couples rouleau conducteur-anode, on effectue un dépôt de zinc sur la bande métallique dont l'épaisseur est légèrement inférieure à l'épaisseur totale du revêtement à obtenir, puis au cours d'une seconde étape correspondant à la seconde série de couples rouleau conducteur-anode, on effectue un dépôt de zinc de très faible épaisseur de l'ordre de 0,05 à 0,5 microns, de préférence 0,2 microns, pour obtenir l'épaisseur totale du revêtement.Thus, during a first step of the process corresponding to the first series of conductive roller-anode couples, a zinc deposit is made on the metal strip whose thickness is slightly less than the total thickness of the coating to be obtained, then during a second step corresponding to the second series of conductive roller-anode couples, we deposits a very thin zinc on the order of 0.05 to 0.5 microns, preferably 0.2 microns, to obtain the total thickness of the coating.

La seconde série de couples rouleau conducteur-anode correspond au dernier ou au deux derniers couples rouleau conducteur-anode de la dernière cellule électrolytique.The second series of conductor-anode roller pairs corresponds to the last or the last two conductor-anode roller couples of the last electrolytic cell.

Cette réduction de l'intensité du courant d'alimentation du ou des deux derniers couples rouleau conducteur-anode de la dernière cellule électrolytique permet de réduire de manière significative la rugosité de la bande traitée et de ce fait d'éviter, par la suite la décohésion du revêtement par exemple de zinc pendant une opération d'étuvage destinée, par exemple, à polymériser une couche de peinture sur la bande.This reduction in the intensity of the supply current of the last two or more conductive roller-anode pairs of the last electrolytic cell makes it possible to significantly reduce the roughness of the strip treated and therefore avoid subsequently decohesion of the coating, for example of zinc, during a steaming operation intended, for example, to polymerize a layer of paint on the strip.

Des mesures de rugosité arithmétique ont été effectuées à l'aide d'un rugosimètre sur des tôles nues, des tôles revêtues sans appliquer le procédé selon l'invention et des tôles revêtues selon le procédé décrit.Arithmetic roughness measurements were carried out using a roughness tester on bare sheets, coated sheets without applying the method according to the invention and coated sheets according to the described method.

On constate que pour une tôle nue dont la rugosité arithémétique initiale Ra est égale à 1,3 microns, elle est égale à 1,6 microns lorsque la tôle est revêtue sans appliquer le procédé selon l'invention alors qu'elle n'est que de 1,4 microns lorsqu'elle est revêtue selon le procédé de l'invention, l'épaisseur totale du revêtement étant égale à 7,5 microns.It is found that for a bare sheet whose initial arithemetic roughness Ra is equal to 1.3 microns, it is equal to 1.6 microns when the sheet is coated without applying the method according to the invention when it is only 1.4 microns when coated according to the method of the invention, the total thickness of the coating being equal to 7.5 microns.

Bien entendu les deux étapes successives du procédé peuvent être réalisées dans plusieurs cellules électrolytique disposées en série.Of course, the two successive stages of the process can be carried out in several electrolytic cells arranged in series.

Claims (5)

Procédé d'électrozingage d'une bande métallique, du type dans lequel on fait défiler la bande dans au moins une cellule électrolytique contenant un bain d'ions à déposer sur la bande et comprenant des rouleaux conducteurs électriques, formant cathode, en contact avec ladite bande et au moins une anode placée en regard de chaque rouleau, chaque couple rouleau conducteur-anode étant alimenté en courant électrique, caractérisé en ce qu'on effectue le dépôt en faisant défiler la bande entre une première série de couple rouleau conducteur-anode alimentés en courant selon une première intensité appropriée, puis entre une seconde série de couples de rouleau conducteur-anode alimentés en courant selon une seconde intensité comprise entre 7,5 et 20% de la première intensité.Method for electrogalvanizing a metal strip, of the type in which the strip is passed through at least one electrolytic cell containing an ion bath to be deposited on the strip and comprising electrically conductive rollers, forming a cathode, in contact with said strip strip and at least one anode placed opposite each roller, each pair of conductive roller and anode being supplied with electric current, characterized in that the deposition is carried out by running the strip between a first series of pair of conductive roller and anode supplied in current at a suitable first intensity, then between a second series of conductive-anode roller pairs supplied with current at a second intensity between 7.5 and 20% of the first intensity. Procédé selon la revendication 1, caractérisé en ce que la seconde intensité est comprise entre 5 et 15 A/dm² et de préférence égale à 10 A/dm².Method according to claim 1, characterized in that the second intensity is between 5 and 15 A / dm² and preferably equal to 10 A / dm². Procédé selon la revendication 1, caractérisé en ce que la seconde série correspond au dernier couple rouleau conducteur-anode de la dernière cellule électrolytique.Method according to claim 1, characterized in that the second series corresponds to the last conductive roller-anode pair of the last electrolytic cell. Procédé selon la revendication 1, caractérisé en ce que la seconde série correspond aux deux derniers couples rouleau conducteur-anode de la dernière cellule électrolytique.Method according to claim 1, characterized in that the second series corresponds to the last two pairs of conductive roller and anode of the last electrolytic cell. Procédé selon la revendication 1, caractérisé en ce que, entre la seconde série de couples de rouleau conducteur-anode, on dépose un revêtement sur la bande métallique dont l'épaisseur est comprise entre 0,05 et 0,5 microns, de préférence égale à 0,2 microns.Method according to claim 1, characterized in that, between the second series of pairs of conductive roller and anode, a coating is deposited on the metal strip whose thickness is between 0.05 and 0.5 microns, preferably equal at 0.2 microns.
EP92402715A 1991-10-16 1992-10-05 Process for zinc electroplating on a metal strip Expired - Lifetime EP0538095B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9112769A FR2682690A1 (en) 1991-10-16 1991-10-16 GALVANOPLASTY PROCESS OF A METAL STRIP
FR9112769 1991-10-16

Publications (2)

Publication Number Publication Date
EP0538095A1 true EP0538095A1 (en) 1993-04-21
EP0538095B1 EP0538095B1 (en) 1996-01-17

Family

ID=9417984

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92402715A Expired - Lifetime EP0538095B1 (en) 1991-10-16 1992-10-05 Process for zinc electroplating on a metal strip

Country Status (5)

Country Link
EP (1) EP0538095B1 (en)
AT (1) ATE133210T1 (en)
DE (1) DE69207704T2 (en)
ES (1) ES2081592T3 (en)
FR (1) FR2682690A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1033100A (en) * 1964-08-05 1966-06-15 Int Nickel Ltd Electrodeposition of nickel

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1033100A (en) * 1964-08-05 1966-06-15 Int Nickel Ltd Electrodeposition of nickel

Also Published As

Publication number Publication date
DE69207704T2 (en) 1996-08-01
ATE133210T1 (en) 1996-02-15
ES2081592T3 (en) 1996-03-16
EP0538095B1 (en) 1996-01-17
DE69207704D1 (en) 1996-02-29
FR2682690B1 (en) 1994-12-16
FR2682690A1 (en) 1993-04-23

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