EP0752485A1 - Vorrichtung zur Maskierung der Rander eines Metallblechs zur Verwendung in einer Elektroplattierungszelle des Radialtyps um die Dendritbildung zu vermeiden - Google Patents

Vorrichtung zur Maskierung der Rander eines Metallblechs zur Verwendung in einer Elektroplattierungszelle des Radialtyps um die Dendritbildung zu vermeiden Download PDF

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Publication number
EP0752485A1
EP0752485A1 EP96401348A EP96401348A EP0752485A1 EP 0752485 A1 EP0752485 A1 EP 0752485A1 EP 96401348 A EP96401348 A EP 96401348A EP 96401348 A EP96401348 A EP 96401348A EP 0752485 A1 EP0752485 A1 EP 0752485A1
Authority
EP
European Patent Office
Prior art keywords
roller
mask
edges
strip
width
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
EP96401348A
Other languages
English (en)
French (fr)
Other versions
EP0752485B1 (de
Inventor
Michel Decool
Alain Bello
Pierre Debusschere
Philippe Dulac
Georges Leleux
Robert Demarque
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 EP0752485A1 publication Critical patent/EP0752485A1/de
Application granted granted Critical
Publication of EP0752485B1 publication Critical patent/EP0752485B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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

  • a radial type cell comprises a tank which contains the electroplating bath, a partially submerged strip support roller, submerged anodes arranged facing the roller at approximately constant distance, means for circulating an electric current between said anodes and a strip serving as a cathode, means for passing through the tank of the strip supported by said roller and means for circulating said bath in the space separating the anodes from the strip.
  • the tape support roller generally comprises an electrically insulating coating, generally rubberized; optionally, the surface of the central part of the roller is conductive, when the roller is used to supply electric current to the strip which serves as a cathode.
  • the object of the invention is to provide an edge masking device suitable for radial electroplating cells with soluble anodes and with strong hydrodynamic constraints, corresponding in particular to relative speeds between the strip to be coated and the electrolysis bath greater than 2 m. / s.
  • the subject of the invention is a device for masking the edges of a metal strip suitable for a plating cell of the radial type, comprising a support roller for said metal strip and soluble anodes arranged opposite said roller, said device comprising a shaped mask.
  • said mask comprises a semi insulating strip rigid, in particular in a composite material with a polymer matrix, having, on its internal face turned towards said roller, on the one hand on the internal side oriented towards the middle of said roller, a recess over its entire length, on the other hand on the external side opposite, pads of non-stick material, regularly spaced and fixed on said inner face and characterized in that, thanks to fixing means, said mask is applied against the surface of said roller via of said studs and positioned so that said edges are engaged in said recess.
  • the radial type electrodeposition cell supported by a frame (not shown), comprises a tank (not shown) which contains an electrodepositon bath, a roller 1 strip support partially immersed in the bath, anodes soluble 2 submerged disposed facing the roller 1, means not shown for circulating an electric current between the anodes 2 and the metal strip B to be coated and serving as cathode, scrolling means (not shown) in the tank of the strip B supported by the roller 1 and means for circulating said bath in the space separating the anodes 2 from the strip B.
  • These means for circulating the bath comprise injection ramps 3 placed at the point where the strip B in movement enters and leaves of the space separating the anodes 2 from the roller 1, a space which is generally called "gap”.
  • This masking device comprises two identical masks 4 in the form of narrow strips each arranged facing a bank 10 of the strip B in movement and supported at each end 5 by anchoring means 14 supported by fixing means 6.
  • the masks 4 mainly consist of a semi-rigid insulating strip 7, preferably made of a polymer matrix composite material; this composite material can for example be reinforced with glass fibers.
  • Each insulating strip 7 extends between the roll 1 and the anodes 2, over approximately a half-circumference of the roll 1.
  • the contact or sliding surface of the pads 9 on the roller 1 is located in the immediate vicinity of the edges 10 of the strip B in movement.
  • the studs 9 consist of plates of non-stick material, of TEFLON type, fixed for example by bonding to the internal face of the insulating strip 7 outside the detachment zone 8 (cf. FIG. 1B).
  • the total thickness of the mask 4 is approximately 8 mm.
  • a thickness of the mask of approximately 8 mm
  • the recess 8 extends almost over the entire length of the insulating strip 7.
  • the interval which separates the insulating strip 7 from the roll 1 corresponds to the depth of said recess in the strip 7 added to the thickness of the studs 9.
  • This interval must be much greater than the thickness of the strip B.
  • the depth of the step 8 in the strip 7 is approximately 2 mm; the interval which separates the insulating strip 7 from the roll 1 is then approximately 5 mm and the residual thickness of the insulating strip 7 at the recess 8 is approximately 3 mm.
  • the width of the step 8 must be much greater than that of the edges 10, that is to say of the portion of strip B on which it is sought to avoid the dendrites.
  • this edge width 10 to be protected is approximately 15 mm, the width of the step 8 is then approximately 30 mm.
  • the total width of the insulating strip 7 is at least equal to the sum of the width of the recess 8 and the width of the pads 9; for an offset width 8 of 30 mm, it can typically be around 120 mm.
  • the connecting rods 13 and 15 are extensible in the sense that their length can be adjusted; for example, they are made up of two tubes fitted one inside the other as shown in FIG. 4.
  • the connecting rods 13 and 15 are capable of sliding respectively along the bars 12 and 11 in order to properly position the masks 4 opposite the edges 10 of the strip B.
  • the anchoring means 14 supported by the ends of two connecting rods 13 as shown in FIG. 3 provide a safety function, which allows the mask 4 to be released from its fixing means 6, in the event of an accident, for example in the event of an accident. of attachment of the strip B while scrolling on said mask.
  • the anchoring means 14 comprise a cylinder 17 and a fastener 18.
  • the cylinder 17 is integral with the ends of the two connecting rods 13 and kept approximately parallel to the bars 11, 12; according to the invention, the cylinder 17 is split over its entire length by a slot 19 oriented towards the entrance to the gap separating the anodes 2 from the roller 1.
  • the fastener 18 passes through the slot 19 and has, at one end, clamping means for fixing the end 5 of the mask 4 and, at the other end, a prominent end piece embedded in the cylinder 17.
  • the thickness of the end piece is greater than the width of the slot 19 so that it cannot pass through said slot.
  • the fastener 18 remains secured to the cylinder 17 under the normal conditions of stress of the mask 4 on the fixing means 6, which are defined by the normal operating conditions of the cell.
  • the mechanical and geometrical characteristics of the cylinder 17 and of the end piece of the fastener 18 are determined in a manner known per se on the one hand to avoid the opening of the slot under the normal conditions of stress of the fastener 18 supporting the mask 4 when the cell is in operation, on the other hand to allow an opening of the slot 19 sufficient to allow passage the nozzle as soon as the stress on the fastener exceeds a predetermined threshold.
  • the end piece may be of square section as shown in FIG. 4.
  • the anchoring means 14 can also have a function of adjusting the position of the masks 4 relative to those of the edges 10 of the strip B in movement on the roller 1.
  • the cylinder 17 has a length much greater than the width of the mask 4; it is then possible to slide the fastener 18 inside the cylinder 17 over a stroke sufficient to effect said adjustment.
  • the metal strip B to be coated is for example a steel strip approximately 2 m wide and 0.4 mm thick.
  • the position of the masks 4 is adjusted opposite the edges 10 of the metal strip B to be coated, in particular by sliding the connecting rods 13 and 15 along the fixed bars 11 and 12.
  • the position of the masks 4 is adjusted so that the edges 10 on each side of the strip B are inserted into the recess 8 of the masks 4, as shown in FIG. 2.
  • this device can advantageously be used to precisely adjust the position of the masks.
  • this clearance can be of the order of 10mm on each side.
  • the tension of the masks 4 must not be too high, to limit friction with the surface of the roller 1; however, it should be sufficient to properly hold the masks 4 facing the edges 10 of the strip B.
  • zinc is deposited, in particular by passing the strip B through the cell using the scrolling means, by passing an electric current between the anodes 2 and the strip B serving as the cathode while circulating the electrolysis bath in the "gap", in particular thanks to the injection rails 3.
  • the hydrodynamic forces exerted on the masks 4 help to separate them from the roller 1 and to limit the friction of the masks 4 on the roller 1.
  • the deposits on the banks do not offer any under-thickness and have a morphology comparable to that of the deposits in the center of the strip.
  • the relative speed between the strip and the bath is greater than 2 m / s.
  • the Applicant attributes this surprising effect to the geometry of the masks 4, which, in particular thanks to the recess 8 and the intervals which separate the pads 9, allow free circulation of the electrolysis bath , even in directions other than that of the tape running.
  • the flexibility of the insulating strips 7 also contributes to the stability of the masks 4, since it is thanks to it that the masks 4 deviate slightly from the roller 1 during operation, which further facilitates the circulation of the bath and limits the friction of the masks 4 on the roller 1.
  • the masks 4 are both sufficiently rigid to be held facing the edges 10 and sufficiently flexible to assume a stable position slightly spaced from the surface of the roller 1.
  • Another supposed effect of the free circulation of the bath between the masks 4 and the edges 10 of the strip is to allow a deposit having approximately the same thickness and the same morphology as in the center of the strip.
  • the mask 4 in the event of an accident, for example in the event that the strip B is hooked while scrolling on one of the masks 4, the mask 4 is released from the fastening means 6: in fact, under the effect of the tension exerted on the mask 4 at the time of attachment, the fastener 18 emerges from the cylinder 17 by spreading the slot 19 to let its prominent tip pass.

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)
  • Electrolytic Production Of Metals (AREA)
  • Secondary Cells (AREA)
EP96401348A 1995-07-07 1996-06-20 Vorrichtung zur Maskierung der Ränder eines Metallblechs zur Verwendung in einer Elektroplattierungszelle des Radialtyps um die Dendritbildung zu vermeiden Expired - Lifetime EP0752485B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9508202 1995-07-07
FR9508202A FR2736364B1 (fr) 1995-07-07 1995-07-07 Dispositif de masquage de rives de bande metallique adapte a une cellule d'electrodeposition de type radial, pour la prevention des dendrites

Publications (2)

Publication Number Publication Date
EP0752485A1 true EP0752485A1 (de) 1997-01-08
EP0752485B1 EP0752485B1 (de) 1999-04-21

Family

ID=9480759

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96401348A Expired - Lifetime EP0752485B1 (de) 1995-07-07 1996-06-20 Vorrichtung zur Maskierung der Ränder eines Metallblechs zur Verwendung in einer Elektroplattierungszelle des Radialtyps um die Dendritbildung zu vermeiden

Country Status (4)

Country Link
EP (1) EP0752485B1 (de)
AT (1) ATE179226T1 (de)
DE (1) DE69602130D1 (de)
FR (1) FR2736364B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998048083A2 (de) * 1997-04-18 1998-10-29 Circuit Foil S.A. Vorrichtung zum durchführen kontinuierlicher elektrolytischer abscheidungsprozesse
CN1804146B (zh) * 2004-12-27 2010-05-05 同和矿业株式会社 电镀装置及电镀方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0261691A1 (de) * 1986-09-26 1988-03-30 Kawasaki Steel Corporation Galvanisierzelle mit Randmasken

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0261691A1 (de) * 1986-09-26 1988-03-30 Kawasaki Steel Corporation Galvanisierzelle mit Randmasken

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998048083A2 (de) * 1997-04-18 1998-10-29 Circuit Foil S.A. Vorrichtung zum durchführen kontinuierlicher elektrolytischer abscheidungsprozesse
WO1998048083A3 (de) * 1997-04-18 1999-02-11 Circuit Foil Sa Vorrichtung zum durchführen kontinuierlicher elektrolytischer abscheidungsprozesse
US6306268B1 (en) 1997-04-18 2001-10-23 Circuit Foil, S.A. Of Luxemburg Device for carrying out continuous electrolytic precipitation
CN1804146B (zh) * 2004-12-27 2010-05-05 同和矿业株式会社 电镀装置及电镀方法

Also Published As

Publication number Publication date
FR2736364A1 (fr) 1997-01-10
EP0752485B1 (de) 1999-04-21
DE69602130D1 (de) 1999-05-27
FR2736364B1 (fr) 1997-08-08
ATE179226T1 (de) 1999-05-15

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