EP0254703B1 - Procédé et installation d'électrozingage d'une bande d'acier - Google Patents

Procédé et installation d'électrozingage d'une bande d'acier Download PDF

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Publication number
EP0254703B1
EP0254703B1 EP87870098A EP87870098A EP0254703B1 EP 0254703 B1 EP0254703 B1 EP 0254703B1 EP 87870098 A EP87870098 A EP 87870098A EP 87870098 A EP87870098 A EP 87870098A EP 0254703 B1 EP0254703 B1 EP 0254703B1
Authority
EP
European Patent Office
Prior art keywords
drum
anodes
strip
electrolyte
plant according
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
EP87870098A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0254703A1 (fr
Inventor
Joseph Labye
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.)
Delloye-Matthieu Toleries SA
Original Assignee
Delloye-Matthieu Toleries SA
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 Delloye-Matthieu Toleries SA filed Critical Delloye-Matthieu Toleries SA
Priority to AT87870098T priority Critical patent/ATE67529T1/de
Publication of EP0254703A1 publication Critical patent/EP0254703A1/fr
Application granted granted Critical
Publication of EP0254703B1 publication Critical patent/EP0254703B1/fr
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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

Definitions

  • the invention relates to a method of electrogalvanizing a steel strip (2) in which a steel strip (2) acting as a cathode is passed in front of at least one series of anodes, while that a flow of zinc-charged electrolyte is circulated between the cathode and the anodes.
  • the qualities of the electrogalvanized sheets depend on the morphology of the zinc coating, which itself depends on the composition of the electrolytic fluid, the dynamic conditions of the electrolytic fluid, the density of the current applied and the type of electrolytic cell used.
  • the anodes consist of a cast lead-silver alloy body with a copper core.
  • the connection between the copper and the alloy is not always perfect, so that the resistance to the passage of current can differ from one anode to another.
  • the resistance of the steel strip varies throughout it, so that the current passing through the lowest placed anode meets a greater resistance than it which passes through the highest placed anode. .
  • Oxygen is released in large quantities on the anodes.
  • the oxygen concentration in the electrolyte increases from the lowest anode to the highest anode and there are therefore different conditions for the current to flow from one anode to another.
  • the position of the anodes is obviously variable from one to the other.
  • US Pat. No. 3,900,383 discloses an electrogalvanizing drum provided with several conductive segments insulated from one another. These segments are arranged so as to be in electrical contact with a metal strip immersed in an electrolytic bath. A switch connects the segments one after the other to a source of electric current, so that only the segments of the drum which are fully in contact with the strip are supplied with current. This drum prevents the formation of electric arcs between the strip and the drum.
  • This switch can also be made up of independent cathodes connected to anodes by electrical sources, so as to allow the passage of different electrical currents between cathodes and anodes.
  • electrogalvanizing current can be, for example, gradually increased.
  • the device represented in FIG. 4 of this document US-A-3900383 comprises a switch made up of cathodes connected to anodes by adjustable electrical sources.
  • the anodes are mounted in an electric circuit delivering in each of them an electric current, this circuit comprising a current rectifier and a voltage adjustment device.
  • Document US-A-4,500,400 describes a counter-current device for an electroplating apparatus. He teaches that it is preferable to use a high current density so as to obtain a high deposition speed and that if too high a current density is used problems appear at the edges of the metal strip.
  • the process of electrogalvanizing a steel strip in which a steel strip acting as a cathode is passed in front of at least one series of anodes, while one circulates between the cathode and the anodes a flow of electrolyte charged with zinc is characterized in that the flow of electrolyte is forced to flow between a series of anodes and the strip in a direction and at a relative speed with respect to the strip which are everywhere the same, in that each anode of said series is supplied independently of the other anodes with electric current and in that the voltage of each anode is adjusted to pass a determined quantity of electric current through each anode to obtain from each of these anodes the same density of electrolysis current at all points so as to obtain on the steel strip (2) a deposit of zinc with a compact mono-oriented crystal structure.
  • the installation according to the invention for continuously coating in a cell a steel strip of a zinc deposit with a compact mono-oriented structure comprises a drum around which the strip serving as cathode passes and driving it. series of anodes placed one next to the other opposite the cathode and separated from the latter by a continuous flow of electrolyte, said anodes being mounted in an electrical circuit supplying in each of them an electric current, each circuit comprising a current rectifier and a voltage adjustment device.
  • This installation is characterized in that the drum is made of an insulating material and in that the strip closes the electrical circuit so that the resistance to the passage of current presented by this strip varies continuously from an anode to an adjacent anode , the individual assembly making it possible to obtain that the current delivered in each branch corresponds to the same current density in each of the branches respectively comprising an anode and a corresponding portion of the steel strip which moves in front of it and in that '' a variable speed pump intended to bring the electrolyte through a convergent conduit and ramp or nozzle in the cell and / or a variable speed motor intended to drive in rotation a drum on which the band is wound up allow to adjust the relative speed of the fluid with respect to the strip so as to obtain a deposit of zinc with a compact mono-oriented crystal structure.
  • the anodes are distributed around the circumference of the drum and surrounded by an external envelope so as to constitute around the drum two channels symmetrical with respect to a vertical plane passing through the axis of the drum , these channels being traversed by an electrolyte containing zinc, the supply of electrolyte being done by an upper end of one of the channels, and the evacuation of the spent electrolyte, by the end of the other.
  • a preferred embodiment of the installation according to the invention is an installation in which below the drum is located, between the two lower ends of the two symmetrical channels, a vane rotor driven by a motor.
  • FIG. 1 we see in cross section a drum 1 of insulating material, freely rotating about its horizontal axis.
  • the steel strip 2 delivered by a roller 3 and returned to a roller 4 in an arrangement which makes it possible to hold the strip 2 stretched around the drum 1.
  • the strip 2 closes the rectifier circuit 9 by its brain 2 'and the roller assembly 11, and the rectifier circuit 10 by its brain 2 "and the roller assembly 12.
  • the lower part of the drum 1 is surrounded by an envelope 13 forming around the drum 1 a pair of channels 14 and 15 joined at their lower part. At the meeting point of the two channels 14 and 15 opens a pipe 16 for supplying the system with electrolyte.
  • the electrolyte flows according to the arrows F1, F2.
  • each group of anodes 5, 6, supposed to have eight anodes is supplied by a current of 10,000 amperes, one would expect that, in each of the branches of the circuit, leading to any anode 5 ', 6', circulates a current of 1250 amps.
  • the currents flowing in the different branches present, compared to the average value of 1250 amperes, percentage deviations indicated in the second line of Table I below, the first line of this table containing the enumeration of the various anodes input 1E, 2E, etc ..., and various output anodes 1S, 2S, etc ...
  • each of the anodes 5 'and 6' being mounted in a branch of the circuit 17 containing an independent current source 18, adjusted individually to obtain the same current density in each electrolysis cell , that is to say that in each branch 17 of the circuit will circulate a current of the same intensity, of 1250 amps for example.
  • the various anodes 5 'and 6' are separated from each other by a layer of insulating material 27. The voltage of each anode is adjusted so as to allow the passage of a determined quantity of electric current through each anode to obtain from each of them the same density of electrolysis current at all points.
  • Q is the flow rate of the electrolytic fluid and S is the section of the fluid passage duct. This section is equal to the product of the length of the drum 1 and the distance between any anode 5 ', 6' and the steel strip 2; the sign ⁇ is to be chosen according to the direction of flow of the fluid with respect to the direction of travel of the strip 2. This travel takes place at a speed indicated by V D.
  • this rotor 19 comprises symmetrical radial blades 22, the distance between the ends of the blades 22 and the periphery of the drum 1 being the same as the distance from the anodes 5 ′, 6 ′ to this drum 1.
  • the function of this rotor 19 is to provide the electrolyte which descends along one of the channels, for example 15, with additional energy to cause the electrolyte to rise in the other channel, in this case 14, the blades 22 being designed to distribute this additional energy uniformly over the entire width of the channel and guarantee a homogeneous circulation of the electrolyte downstream of the rotor 19, thereby creating symmetrical flow conditions ( see arrows F and F "in FIG. 3) relative to a vertical plane passing through the axis of the drum 1.
  • the lower ends of the channels 14, 15 are limited, on the side opposite that of the drum 1, by deflecting surfaces or ramps 23, 24 whose extreme edge, such as 25 in FIGS. 4 and 5, extends parallel to the axis 20 of the rotor 19 and over the same length as the latter.
  • This edge 25 can advantageously be wavy (FIG. 6).
  • the arrangement of these ramps 23, 24 is still symmetrical with respect to the vertical plane passing through the axis 20 of the rotor 19 and through the axis of the drum 1, so that the operation of the device is the same, regardless of the direction of rotation of the drum 1.
  • the speed of flow of the liquid downstream of these can be increased or decreased.
  • ramp or the converging nozzles 26 can be mounted on the left side of the drum 1 rather than on the right side of the drum as shown in FIGS. 2 and 3.
  • the rotor 19 intervenes to uniformly distribute the additional positive or negative energy which must be communicated to the electrolyte to guarantee a relative speed uniformly distributed downstream of the rotor 19, to satisfy, according to the tape running speed and the current density, under the conditions of a zinc deposit of the compact mono-oriented type.

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)
  • Electroplating And Plating Baths Therefor (AREA)
EP87870098A 1986-07-17 1987-07-13 Procédé et installation d'électrozingage d'une bande d'acier Expired - Lifetime EP0254703B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87870098T ATE67529T1 (de) 1986-07-17 1987-07-13 Verfahren und vorrichtung zum elektrolytischen verzinken von stahlband.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU86520 1986-07-17
LU86520A LU86520A1 (fr) 1986-07-17 1986-07-17 Procede d'electrozingage en continu d'une tole d'acier par voie electrolytique

Publications (2)

Publication Number Publication Date
EP0254703A1 EP0254703A1 (fr) 1988-01-27
EP0254703B1 true EP0254703B1 (fr) 1991-09-18

Family

ID=19730743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87870098A Expired - Lifetime EP0254703B1 (fr) 1986-07-17 1987-07-13 Procédé et installation d'électrozingage d'une bande d'acier

Country Status (6)

Country Link
EP (1) EP0254703B1 (el)
AT (1) ATE67529T1 (el)
DE (1) DE3773075D1 (el)
ES (1) ES2026947T3 (el)
GR (1) GR3003356T3 (el)
LU (1) LU86520A1 (el)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2653787B1 (fr) * 1989-10-27 1992-02-14 Lorraine Laminage Installation et procede de revetement electrolytique d'une bande metallique.
US5685970A (en) * 1992-07-01 1997-11-11 Gould Electronics Inc. Method and apparatus for sequentially metalized polymeric films and products made thereby
EP0867529B1 (en) * 1997-03-26 2003-06-04 GA-TEK, Inc. (doing business as Gould Electronics Inc.) A method and apparatus for sequentially metalizing polymeric films
DE19717489B4 (de) * 1997-04-25 2008-04-10 Sms Demag Ag Anordnung zur elektrogalvanischen Metallbeschichtung eines Bandes
FR2765597B1 (fr) * 1997-07-02 1999-09-17 Kvaerner Metals Clecim Installation de revetement electrolytique de bandes metalliques, et anode pour une telle installation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3900383A (en) * 1974-07-24 1975-08-19 Nat Steel Corp Apparatus for electroplating
JPS6082700A (ja) * 1983-10-07 1985-05-10 Kawasaki Steel Corp ラジアルセル型めつき槽におけるカウンタ−フロ−装置

Also Published As

Publication number Publication date
LU86520A1 (fr) 1988-02-02
ES2026947T3 (es) 1992-05-16
EP0254703A1 (fr) 1988-01-27
ATE67529T1 (de) 1991-10-15
DE3773075D1 (de) 1991-10-24
GR3003356T3 (en) 1993-02-17

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