EP0167868A1 - Installation pour le revêtement électrolytique des bandes métalliques, en particulier pour le zingage des bandes d'acier - Google Patents

Installation pour le revêtement électrolytique des bandes métalliques, en particulier pour le zingage des bandes d'acier Download PDF

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Publication number
EP0167868A1
EP0167868A1 EP85107291A EP85107291A EP0167868A1 EP 0167868 A1 EP0167868 A1 EP 0167868A1 EP 85107291 A EP85107291 A EP 85107291A EP 85107291 A EP85107291 A EP 85107291A EP 0167868 A1 EP0167868 A1 EP 0167868A1
Authority
EP
European Patent Office
Prior art keywords
coating
coating apparatus
anode
strip
roller
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.)
Withdrawn
Application number
EP85107291A
Other languages
German (de)
English (en)
Inventor
Paul Birkelbach
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.)
Krupp Stahl AG
Original Assignee
Krupp Stahl AG
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 Krupp Stahl AG filed Critical Krupp Stahl AG
Publication of EP0167868A1 publication Critical patent/EP0167868A1/fr
Withdrawn legal-status Critical Current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
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils

Definitions

  • Plant for the electrolytic surface coating of a metal strip in particular for the galvanizing of steel strip
  • the invention relates to a plant for electrolytic.
  • DE-OS 29 17 630 discloses an arrangement for the electrolytic galvanizing of rolled strip, the coating apparatuses of which are provided with non-soluble anodes and have slot nozzle tubes on the outlet side, via which the electrolyte liquid is fed to the passage gap between the anodes on both sides of a continuous strip flows through it in counterflow to the belt pass.
  • the generic coating arrangement is suitable for both one-sided and double-sided coating. In the case of one-sided coating, panels are moved to the side of the belt in order to move the spaces above and below the belt to separate others.
  • the distance between the plate-shaped anodes must be kept comparatively large. It is generally about 25 mm on the top and bottom. Since with this clamping length and a typical strip tension of approx. 10 to 15 N / mm 2 strip cross-section, a strip sag of several millimeters cannot be prevented and this is additionally negatively influenced by the electrolyte flow, the anode-cathode distance can hardly be reduced.
  • rollers arranged in front of and behind a coating apparatus in stands.
  • the upper of the two rollers is in each case a contact roller, that is to say designed as a cathodic current transfer roller rend the lower roller works as a counter pressure roller with pneumatic pressure.
  • the contact rollers consist of a stainless steel alloy, which on the one hand ensures the required specific current load and on the other hand has sufficient corrosion resistance against the highly acidic electrolyte.
  • This roller arrangement has the disadvantage that metal sulfate and metal oxide crystals detaching from the upper anode, if they cannot be rinsed away completely or in time from the strip surface, lead to impressions on the strip surface through the hard surface of the contact roller. To avoid such current roller imprints, which lead to the qualitative devaluation of coated strips with high surface demands, complex measures must therefore be taken.
  • the object of the invention is therefore to further develop the generic system for electrolytic surface coating in such a way that higher specific current densities are permissible and the energy requirement is reduced.
  • a sub-task of the invention is to largely eliminate surface defects caused by contact roller impressions.
  • the sub-task is solved by a system according to claim 2, which is characterized in that the first coating apparatus of a pair of coating apparatuses rising in the direction of travel of a strip, the second coating apparatus falling, and that the deflecting roller leading a continuous strip from below is arranged between the coating apparatuses is designed as a contact role.
  • angles of inclination of the coating apparatus with respect to the horizontal, the angles ⁇ and ⁇ are identical to one another, and preferably set to 5 to 6, given the same geometric dimensions of the coating apparatus.
  • the strip guide caused by the arrangement according to the invention with repeated, albeit relatively small deflection, enables a very exact guide of the strip in the plane intended for it and, via this exact guide, a reduction in the anode distance in the coating apparatus, which is caused by a shortening of the length of the coating apparatus and so that shortening of the anodes can be reduced even further.
  • S o are surface damages claim 3 also avoided in accordance that the upstream and downstream of the two coating apparatuses disposed tape guide rollers are coated with electrolyte-resistant plastic and one of these tape guide rollers is driven at least.
  • the angle of inclination of the coating apparatus is continuously adjustable.
  • Claim 5 specifies means for adjusting or continuously adjusting the inclination of the coating apparatus with a configuration according to claim 6.
  • the invention allows, at the anode lengths of 600 to 700 per mm coating apparatus an A nodenabstand to the cathode of ca, 10 to 12 adjust mm.
  • This small distance enables current densities of more than 200 or up to 160 A / dm 2 at electrical voltages of approx. 10 to 12 V at comparable belt speeds (150 or .60 m / min).
  • Current densities of approx. 100 A / dm 2 worked, while the average electrical voltage values are approx. 15 to 18 V depending on the electrical conductivity of the electrolyte and the anode-cathode distance.
  • the considerable reduction in voltage achieved by the invention inevitably leads to a considerable reduction in the energy requirement.
  • the first coating apparatus 1 is arranged to rise with an angle ⁇ of 5 to 6
  • the second coating apparatus 2 is arranged to decrease with an angle ⁇ of 5 to 6.
  • the two coating apparatuses 1 and 2 are identical to one another, the angle ⁇ corresponds to the angle ⁇ .
  • a deflection roller 4, which is designed as a contact roller, is arranged between the coating apparatuses 1, 2.
  • Each coating apparatus 1, 2 includes a lower anode 5 and an upper anode 6, which enclose between them the urchlaufspalt D. 7
  • a corresponding symbol 8+ indicates the connection of the anodes, and a symbol 8- the connection of the contact roller, to a DC circuit.
  • the coating apparatus 1, 2 contains inlet channels 9 and 10 pointing at an acute angle to the inlet side and ending in the passage gap 7 between the anodes 5, 6 and fed by electrolytes under hydraulic pressure, the lower inlet channel 9 being a band 3 from below, the upper inlet channel 10 a band flows from above.
  • Belt guide rollers coated with electrolyte-resistant plastic are provided on the inlet and outlet sides, each consisting of a lower belt guide roller 12 and an upper belt guide roller 13.
  • the lower tape guide roller 12 is pressed by a pneumatic pressure device 14.
  • a continuous belt 3 is tensioned roof-shaped by the inlet-side belt guide roller 13, the deflecting roller 4 and the outlet-side belt guide roller 13, with this multiple buckling from the horizontal also not quite flat belts are guided relatively well.
  • each anode contains slightly protruding insulating plastic strips 15, which prevent the risk of direct contact between the anode 5 or 6 and the cathode, namely the strip 3.
  • a common collecting trough 16 is provided as a device for collecting the electrolyte liquid emerging from the coating apparatuses 1, 2, the outlet spout 17 of which is connected to the electrolyte supply circuit.
  • the first coating apparatus 1 is rigidly connected to a first support frame 19, the second: coating apparatus 2 to a second support frame 20.
  • the first support frame 19 is horizontally displaceably and movably supported at its outer end in the plane determined by the axes of the inlet-side tape guide rollers 12, 13, specifically via a bearing arrangement 22.
  • a corresponding bearing arrangement 23 is assigned to the second support frame 20.
  • the support frames 19, 20 are connected to one another in an articulated manner via a horizontal hinge pin 21 and are held in the hinge pin by the liftable and lowerable piston of a stationary lifting device 18. Details of this design are explained in more detail in the description of FIG. 7.
  • an arrow 24 indicates the direction of travel of the belt 3.
  • the first coating apparatus 1 is arranged to fall, the second coating apparatus 2 to rise.
  • a pressing device 25 serves to press the counter pressure roller 11.
  • the deflection roller 4 serving as the cathode here attacks the belt 3 from above. With this arrangement, care must be taken to ensure that the coated upper surface of the belt is kept clean, which is not indicated by posed spray devices can be achieved.
  • adjustable anodes 5, 6 are provided in the sections and cutouts from coating apparatus 1 shown in FIGS. 3 and 4.
  • an anode 5 is attached to a lower anode cover 30 and an anode 6 to an upper anode cover 31.
  • the A node covers 30, 31 are movable on the housing frame 29 of the coating apparatus 1 ; attached.
  • Each anode cup 30, 31 is movably mounted and an adjusting device in either one of the two A-b was detected positions between two different distance positions to the traveling plane or in a continuous band.
  • the housing frame has an essentially E-shaped cross section on both sides of the anodes, in which the two anode covers 30, 31 are immersed.
  • Interchangeable stops 38, 39 are provided on the lower crosspiece 35 and on the upper crosspiece 37 as well as on the inner crosspiece 36, against which the anode covers optionally rest and which thus determine the two spacing positions of the anode covers 30, 31.
  • pairs of pressure pads each consisting of a lower pressure pad 40 and an upper pressure pad 41, are provided as actuating devices.
  • the lower pressure pad 40 is relieved and the upper pressure pad 41 is pneumatically loaded, so that there is a spacing position of the anode 5 from the strip 3 that is very large.
  • the lower pressure pad is also relieved and the upper pressure pad 41 be loads, so that here the spacing position is at the smallest distance from the anode 6 to the strip 3.
  • the .ber side of the band 3 is coated and for this reason, as is generally known, a screen 42 is moved up to the edge of the band 3.
  • a pair of pneumatic cylinders 33, 34 is provided as the adjusting device, the lower cylinder 33 'being supported on the housing frame 29 via a bar 32 and a connecting support 43, while the upper cylinder 34 supports the via the Support frame 19 and a further connection carrier 26 experiences.
  • the anodes 5, 6 can be moved apart when the connection point between two strip sections, which is generally somewhat wavy due to a weld seam or other connecting means, passes through the coating apparatus. Also, when passing strongly wavy band areas with anodes 5, 6 moved apart, contacts between band 3 and anodes 5, 6 can be avoided.
  • FIGS. 5 and 6 plants are shown schematically, each containing four coating apparatus 1, 2, la, 2a.
  • the ascending coating apparatus is provided with the reference number 1 or la.
  • the arrangement according to FIG. 5 is preferred.
  • a drip pan 16 and 16a is assigned to two coating apparatuses 1, 2 and 1a, 2a, respectively. This creates a kind of twin cells arranged one behind the other.
  • the system shown in FIG. 7 in turn contains two coating apparatus 1, 2, essentially corresponding to the embodiment according to FIG. 1 and FIG. 4.
  • the respective upper tape guide roller 13 is driven.
  • FIG. 7 shows in particular a carrier 28 which connects the lifting device 18 to the hinge pin 21 and on which the deflection roller 4 is mounted.
  • This connection of the lifting device to the support frames 19 and 20 ensures that the deflection roller 4 serving as the contact roller has the correct position in every lifting position, i.e. even when the inclination of the coating apparatus to the horizontal changes.
  • the inclination of the coating apparatus 1, 2 can be changed continuously. You can set this inclination to set up the system to 0 and then, after the tape has been threaded in and has passed the exit-side tape guide rollers 12, 13, for example to 5 •.
  • the coating apparatuses 1, 2 also each contain end-side degassing chambers with a vacuum connection in order to suck off any gases that may form.

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 Apparatus (AREA)
EP85107291A 1984-06-28 1985-06-13 Installation pour le revêtement électrolytique des bandes métalliques, en particulier pour le zingage des bandes d'acier Withdrawn EP0167868A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843423734 DE3423734C1 (de) 1984-06-28 1984-06-28 Anlage zur elektrolytischen Oberflaechenbeschichtung eines Metallbandes,insbesondere zur Verzinkung von Stahlband
DE3423734 1984-06-28

Publications (1)

Publication Number Publication Date
EP0167868A1 true EP0167868A1 (fr) 1986-01-15

Family

ID=6239301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85107291A Withdrawn EP0167868A1 (fr) 1984-06-28 1985-06-13 Installation pour le revêtement électrolytique des bandes métalliques, en particulier pour le zingage des bandes d'acier

Country Status (3)

Country Link
EP (1) EP0167868A1 (fr)
JP (1) JPS6115996A (fr)
DE (1) DE3423734C1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0270100A2 (fr) * 1986-12-02 1988-06-08 Kawasaki Steel Corporation Cellule de traitement électrolytique
EP1865094A1 (fr) * 2006-06-08 2007-12-12 Bavarian Coating Technologies AG Appareil pour placage électrochimique sur des surfaces et système de placage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2519374Y2 (ja) * 1990-06-22 1996-12-04 ダイソー株式会社 鋼板処理用電極
CN103834982B (zh) * 2012-11-22 2016-10-05 宝山钢铁股份有限公司 一种水平式电镀槽及其电镀区阴阳极间隙自动补偿方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR448243A (fr) * 1912-07-15 1913-01-25 Federico Werth Dispositif pour la galvanisation uniforme des bandes, fils métalliques, etc., en une succession continue
US4401523A (en) * 1980-12-18 1983-08-30 Republic Steel Corporation Apparatus and method for plating metallic strip

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR448243A (fr) * 1912-07-15 1913-01-25 Federico Werth Dispositif pour la galvanisation uniforme des bandes, fils métalliques, etc., en une succession continue
US4401523A (en) * 1980-12-18 1983-08-30 Republic Steel Corporation Apparatus and method for plating metallic strip

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0270100A2 (fr) * 1986-12-02 1988-06-08 Kawasaki Steel Corporation Cellule de traitement électrolytique
EP0270100A3 (en) * 1986-12-02 1988-08-31 Kawasaki Steel Corporation Electrolytic processing cell
US4806223A (en) * 1986-12-02 1989-02-21 Kawasaki Steel Corporation Electrolytic processing cell
EP1865094A1 (fr) * 2006-06-08 2007-12-12 Bavarian Coating Technologies AG Appareil pour placage électrochimique sur des surfaces et système de placage
WO2007140949A1 (fr) * 2006-06-08 2007-12-13 Bct Coating Technologies Ag Dispositif de déposition galvanique de surfaces et système de galvanisation
US7837839B2 (en) 2006-06-08 2010-11-23 Bct Coating Technologies Ag Conductive coating of surfaces

Also Published As

Publication number Publication date
DE3423734C1 (de) 1985-09-12
JPS6115996A (ja) 1986-01-24

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19860916

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Inventor name: BIRKELBACH, PAUL