EP0538095B1 - Procédé d'électrozingage d'une bande métallique - Google Patents

Procédé d'électrozingage d'une bande métallique Download PDF

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Publication number
EP0538095B1
EP0538095B1 EP92402715A EP92402715A EP0538095B1 EP 0538095 B1 EP0538095 B1 EP 0538095B1 EP 92402715 A EP92402715 A EP 92402715A EP 92402715 A EP92402715 A EP 92402715A EP 0538095 B1 EP0538095 B1 EP 0538095B1
Authority
EP
European Patent Office
Prior art keywords
anode
strip
roller
conductive roller
current
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
EP92402715A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0538095A1 (fr
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
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
Application filed by Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0538095A1 publication Critical patent/EP0538095A1/fr
Application granted granted Critical
Publication of EP0538095B1 publication Critical patent/EP0538095B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 method according to the invention is applied to the formation of zinc, with a thickness of approximately 10 ⁇ m 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 pairs supplied with current at a suitable first intensity, generally greater than 50 A / dm, 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 / dm and preferably equal to 10 A / dm.
  • 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 ⁇ m, preferably 0.2 ⁇ m, 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)
EP92402715A 1991-10-16 1992-10-05 Procédé d'électrozingage d'une bande métallique Expired - Lifetime EP0538095B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9112769 1991-10-16
FR9112769A FR2682690A1 (fr) 1991-10-16 1991-10-16 Procede de galvanoplastie d'une bande metallique.

Publications (2)

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

Family

ID=9417984

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92402715A Expired - Lifetime EP0538095B1 (fr) 1991-10-16 1992-10-05 Procédé d'électrozingage d'une bande métallique

Country Status (5)

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

Family Cites Families (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
FR2682690A1 (fr) 1993-04-23
EP0538095A1 (fr) 1993-04-21
ATE133210T1 (de) 1996-02-15
DE69207704T2 (de) 1996-08-01
DE69207704D1 (de) 1996-02-29
ES2081592T3 (es) 1996-03-16
FR2682690B1 (enrdf_load_stackoverflow) 1994-12-16

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