EP0254703A1 - Verfahren und Vorrichtung zum elektrolytischen Verzinken von Stahlband - Google Patents

Verfahren und Vorrichtung zum elektrolytischen Verzinken von Stahlband Download PDF

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Publication number
EP0254703A1
EP0254703A1 EP87870098A EP87870098A EP0254703A1 EP 0254703 A1 EP0254703 A1 EP 0254703A1 EP 87870098 A EP87870098 A EP 87870098A EP 87870098 A EP87870098 A EP 87870098A EP 0254703 A1 EP0254703 A1 EP 0254703A1
Authority
EP
European Patent Office
Prior art keywords
strip
anodes
electrolyte
drum
installation 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.)
Granted
Application number
EP87870098A
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English (en)
French (fr)
Other versions
EP0254703B1 (de
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/de
Application granted granted Critical
Publication of EP0254703B1 publication Critical patent/EP0254703B1/de
Anticipated expiration legal-status Critical
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    • 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 an electrogalvanizing process and installation for obtaining on a steel strip a deposit of zinc with a compact monooriented crystal structure.
  • 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.
  • this device does not make it possible to obtain a deposit of zinc with a compact mono-oriented crystal structure. This is due to the fact that not only is the electrolyte flow not unidirectional, but also because the distribution of electric current between anodes and cathode is not uniform.
  • the causes of this non-uniformity are as follows: - heterogeneity of the anodes; - electrical resistance of the steel strip; - variable oxygen content of the electrolytic liquid, and - variations in the position of the anodes.
  • 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 may 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 that passing 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.
  • This device also makes it possible to obtain a current flow which increases first and then decreases in the electrolytic cell.
  • This known device does not make it possible to obtain in all points the same density of electrolysis current as well as to obtain on the strip a deposit of zinc with a compact mono-oriented structure.
  • the device and the method according to the invention aim to remedy the aforementioned drawbacks.
  • the process according to the invention in which a steel strip acting as a cathode is passed in front of a series of anodes, while a charged electrolyte current is circulated between the cathode and the anodes of zinc, is characterized in that each anode is supplied independently of the others with electric current and in that the voltage of each anode is adjusted to pass a given quantity of electric current through each anode to obtain, from each of these anodes, the same density of the electrolysis current at all points.
  • the flow of electrolyte circulating between the strip and the anodes is adjusted so as to obtain a determined relative speed of the electrolyte relative to the strip, in order to obtain a deposit on the strip.
  • zinc with compact mono-oriented structure is adjusted so as to obtain a determined relative speed of the electrolyte relative to the strip, in order to obtain a deposit on the strip.
  • the electrogalvanizing installation according to the invention for continuously coating a steel strip with a zinc deposit which comprises, as is known, an insulating drum around which the strip serving cathode, while in front of the strip and separated from it by a continuous flow of electrolyte containing zinc, is a series of anodes placed one next to the other and mounted at the end of branches of an electric circuit delivering in each of them a direct current, is characterized in that said circuit branches are branched into a number of branches, equal to that of the anodes, each branch containing an individual assembly each comprising a current rectifier and an independent voltage adjustment device, 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 she.
  • 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 made by an upper end of one of the channels, and the discharge 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 brain 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 of 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
  • a current of 1250 amps 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 in each electrolysis cell the same current density, this is that is to say that in each branch 17 of the circuit will circulate a current of the same intensity, of 1250 amperes 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.
  • this rotor 19 comprises symmetrical radial vanes 22, the distance between the ends of the vanes 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 for raising the electrolyte in the other channel, either here 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 Figure 3) with respect 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.
  • the process according to the invention therefore consists: to obtain the same density of the electrolysis current at all points by means of an independent supply of each anode 5 ⁇ , 6 ⁇ with electric current, and by adjusting the voltage of each anode and - To adjust the relative speed of the fluid with respect to the strip 2 to produce compact mono-oriented crystal structures.
  • the relative speed of the fluid with respect to the strip 2 can be modified: - by changing the electrolyte flow in the passages 14, 15, that is to say by changing the speed of rotation of the pump 28 (see Figures 2 and 3) bringing the electrolyte through the conduit 29 and the ramp or the nozzle converge 26 in the cell and / or - by changing the running speed of the steel strip 2, that is to say by changing the speed of the motor 30 driving in rotation a drum 31 on which the steel strip 2 is wound up (see figure 3).

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  • 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 Verfahren und Vorrichtung zum elektrolytischen Verzinken von Stahlband Expired - Lifetime EP0254703B1 (de)

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 true EP0254703A1 (de) 1988-01-27
EP0254703B1 EP0254703B1 (de) 1991-09-18

Family

ID=19730743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87870098A Expired - Lifetime EP0254703B1 (de) 1986-07-17 1987-07-13 Verfahren und Vorrichtung zum elektrolytischen Verzinken von Stahlband

Country Status (6)

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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0425354A1 (de) * 1989-10-27 1991-05-02 Sollac Verfahren und Vorrichtung zur Elektroplattierung eines metallischen Bandes
EP0867529A1 (de) * 1997-03-26 1998-09-30 Gould Electronics Inc. Verfahren und Vorrichtung zur sequentiellen Metallisierung von Polymerfilmen und damit hergestellte Produkte
EP0875605A2 (de) * 1997-04-25 1998-11-04 Sms Schloemann-Siemag Aktiengesellschaft Anordnung zur elektrogalvanischen Metallbeschichtung von Bändern
FR2765597A1 (fr) * 1997-07-02 1999-01-08 Kvaerner Metals Clecim Installation de revetement electrolytique de bandes metalliques, et anode pour une telle installation
US5944965A (en) * 1992-07-01 1999-08-31 Gould Electronics Inc. Method and apparatus for sequentially metalizing polymeric films and products made thereby

Citations (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
US4500400A (en) * 1983-10-07 1985-02-19 Kawasaki Steel Corporation Counter flow device for electroplating apparatus

Patent Citations (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
US4500400A (en) * 1983-10-07 1985-02-19 Kawasaki Steel Corporation Counter flow device for electroplating apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0425354A1 (de) * 1989-10-27 1991-05-02 Sollac Verfahren und Vorrichtung zur Elektroplattierung eines metallischen Bandes
FR2653787A1 (fr) * 1989-10-27 1991-05-03 Lorraine Laminage Installation et procede de revetement electrolytique d'une bande metallique.
US5188720A (en) * 1989-10-27 1993-02-23 Sollac Installation and process for electrolytic coating of a metal strip
US5944965A (en) * 1992-07-01 1999-08-31 Gould Electronics Inc. Method and apparatus for sequentially metalizing polymeric films and products made thereby
US6224722B1 (en) 1992-07-01 2001-05-01 Gould Electronics Inc. Method and apparatus for sequentially metalizing polymeric films and products made thereby
EP0867529A1 (de) * 1997-03-26 1998-09-30 Gould Electronics Inc. Verfahren und Vorrichtung zur sequentiellen Metallisierung von Polymerfilmen und damit hergestellte Produkte
EP0875605A2 (de) * 1997-04-25 1998-11-04 Sms Schloemann-Siemag Aktiengesellschaft Anordnung zur elektrogalvanischen Metallbeschichtung von Bändern
EP0875605A3 (de) * 1997-04-25 1998-12-09 Sms Schloemann-Siemag Aktiengesellschaft Anordnung zur elektrogalvanischen Metallbeschichtung von Bändern
FR2765597A1 (fr) * 1997-07-02 1999-01-08 Kvaerner Metals Clecim Installation de revetement electrolytique de bandes metalliques, et anode pour une telle installation
US6024846A (en) * 1997-07-02 2000-02-15 Kvaerner Metals Clecim Installation for electrolytic coating of metallic bands and anode for such an installation

Also Published As

Publication number Publication date
ATE67529T1 (de) 1991-10-15
ES2026947T3 (es) 1992-05-16
EP0254703B1 (de) 1991-09-18
DE3773075D1 (de) 1991-10-24
LU86520A1 (fr) 1988-02-02
GR3003356T3 (en) 1993-02-17

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