EP0538081A1 - Verbessertes Verfahren zur Elektroplattierung eines Metallbleches - Google Patents

Verbessertes Verfahren zur Elektroplattierung eines Metallbleches Download PDF

Info

Publication number
EP0538081A1
EP0538081A1 EP92402525A EP92402525A EP0538081A1 EP 0538081 A1 EP0538081 A1 EP 0538081A1 EP 92402525 A EP92402525 A EP 92402525A EP 92402525 A EP92402525 A EP 92402525A EP 0538081 A1 EP0538081 A1 EP 0538081A1
Authority
EP
European Patent Office
Prior art keywords
strip
current
anode
metal
during
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
EP92402525A
Other languages
English (en)
French (fr)
Other versions
EP0538081B1 (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
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 EP0538081A1 publication Critical patent/EP0538081A1/de
Application granted granted Critical
Publication of EP0538081B1 publication Critical patent/EP0538081B1/de
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
    • 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 average value Jm of the current density at the surface of the strip is less than the diffusion limit current Jl and, that d 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
  • 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, of 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 step, a layer of zinc 5 ⁇ m thick is deposited and during the second step, 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)
  • Laser Beam Processing (AREA)
  • Physical Vapour Deposition (AREA)
  • Coating With Molten Metal (AREA)
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 true EP0538081A1 (de) 1993-04-21
EP0538081B1 EP0538081B1 (de) 1995-12-06

Family

ID=9417986

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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2732365A1 (fr) * 1995-03-29 1996-10-04 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
EP0887440A1 (de) * 1997-06-26 1998-12-30 Sollac Wassriges Elektroplattierungsbad auf der Basis von Chloride zur Herstellung einer Beschichtung auf der Basis von Zink oder einer Zinklegierung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100487279B1 (ko) * 2002-07-16 2005-05-03 현대모비스 주식회사 아연-철 합금 도금 강판제조방법

Citations (1)

* 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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (1)

* 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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 377 (C-392)(2434) 16 Décembre 1986 & JP-A-61 170 595 ( NIPPON STEEL CORP ) 1 Août 1986 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2732365A1 (fr) * 1995-03-29 1996-10-04 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
US5827419A (en) * 1995-03-29 1998-10-27 Sollac (Societe Anonyme) Continuous process for the electrogalvanizing of metal strip in a chloride-based plating solution in order to obtain coatings with low rugosity at high current densities
EP0887440A1 (de) * 1997-06-26 1998-12-30 Sollac Wassriges Elektroplattierungsbad auf der Basis von Chloride zur Herstellung einer Beschichtung auf der Basis von Zink oder einer Zinklegierung
FR2765247A1 (fr) * 1997-06-26 1998-12-31 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
US6153079A (en) * 1997-06-26 2000-11-28 Sollac Aqueous electrodeposition bath based on chlorides for preparation of a coat based on zinc or zinc alloy

Also Published As

Publication number Publication date
DE69206573T2 (de) 1996-05-02
FR2682691A1 (fr) 1993-04-23
KR930008196A (ko) 1993-05-21
FR2682691B1 (fr) 1994-01-14
ATE131222T1 (de) 1995-12-15
US5344552A (en) 1994-09-06
JPH05214587A (ja) 1993-08-24
EP0538081B1 (de) 1995-12-06
DE69206573D1 (de) 1996-01-18
ES2081590T3 (es) 1996-03-16

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