EP0621353A1 - Verfahren zur Einstellung der Elektroplattierung eines Metallbandes - Google Patents

Verfahren zur Einstellung der Elektroplattierung eines Metallbandes Download PDF

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Publication number
EP0621353A1
EP0621353A1 EP94200729A EP94200729A EP0621353A1 EP 0621353 A1 EP0621353 A1 EP 0621353A1 EP 94200729 A EP94200729 A EP 94200729A EP 94200729 A EP94200729 A EP 94200729A EP 0621353 A1 EP0621353 A1 EP 0621353A1
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Prior art keywords
current
rectifier
rectifiers
strip
iprev
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English (en)
French (fr)
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EP0621353B1 (de
Inventor
Marc Defer
Jean-Michel Walter
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Sollac SA
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Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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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
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/12—Process control or regulation

Definitions

  • the present invention relates generally to the electro-deposition of metal on a continuously moving metal strip.
  • It relates more particularly to a method for regulating the electrolytic deposition of a metal coating on a metal strip forming a cathode and continuously scrolling at a determined speed in an electrolyte, in front of anodes arranged periodically.
  • the anodes are supplied with direct current respectively by controllable rectifiers, and the coating deposited on the strip depends on the current delivered by each rectifier.
  • the technique of metal electrodeposition is used for example for the tinning of a metal strip, as described in patent FR-A-2 590 278 which relates more particularly to the regulation of the deposition of metal at the using a microprocessor.
  • This document describes a process for regulating the quantity of a metal deposited electrolytically on a strip to be coated which runs continuously in a deposition installation comprising several reservoirs filled with electrolyte. The strip passes over a conductive roller forming a cathode associated with each reservoir and the coating metal is supplied by bars of said metal carried by conductive bridges, forming anodes, disposed in each reservoir over part of the path of the strip in said reservoir.
  • the method consists in calculating at each movement of the strip between two successive bridges, the metal deposition under each bridge as a function of the intensity of the supply current of this bridge, of the speed of the strip and of the efficiency of the bridge, at separately follow each strip length equal to the distance between two successive bridges by accumulating successive metal deposits, to establish the balance sheet of the deposit under the last bridge delivering current in order to determine the intensity necessary under this bridge to complete the deposit of metal, to determine the overall current intensity necessary to obtain the desired current intensity under this last bridge, and each time an average measurement is obtained over the entire width of the strip, to be calculated taking into account the distance from transfer, the difference between this average value and a preset preset value by determining a coefficient correcting the theoretical yields of the metal deposit under each bridge.
  • the method includes in particular the measurement of the metal deposited on each face using a periodic scanning gauge, disposed at the outlet of the installation, the deposit being regulated from data delivered by the gauge.
  • the present invention aims to provide a method of electrolytic coating regulation which quickly adapts to coating transients, so that a small strip length is lost in the event of coating transients. Furthermore, the present invention aims to provide a coating regulation method insensitive to speed transients.
  • the total current required is the current required to coat one of the increments having the product width by the highest coating rate.
  • an over-coating is imposed with respect to an under-coating in the vicinity of a weld between two successive strip portions having to support different thicknesses of coating.
  • the number of rectifiers to be put into operation depends on a current density desired for the coating, and a minimum current density below which it is not desired to descend for the coating.
  • the current density influences the appearance of the coating.
  • the determination of a forecast current for each rectifier depends on a state in service or out of service of said each rectifier and of states consigned or not consigned of the rectifiers.
  • the cyclic determination of a forecast current for each rectifier does not depend on the set state of the rectifiers in the case where the equal distribution of the total current required is not possible only in rectifiers in the non-set state. In all cases, the determination of the predicted currents of the rectifiers results in a set of non-zero forecast currents associated with the rectifiers in operation and a set of zero predicted currents.
  • the cyclic determination of the current setpoints of the rectifiers results in a set of non-zero current setpoints associated with the rectifiers in operation and a set of zero current setpoints.
  • a forecast current of a zero rectifier, respectively non-zero results in a current setpoint for the rectifier zero, respectively non-zero.
  • the method comprises, for each rectifier, the calculation of the ratio of the current setpoint of said each rectifier and the speed of travel of the strip, and the assignment of this ratio to the increment of strip present in front of the anodes supplied by this rectifier.
  • the method comprises, for the increment of the band passing in front of the respective anode supplied by the given rectifier, the calculation of an experience which is the sum of the ratios of the current setpoints and of the running speed.
  • the ratios are calculated for the rectifiers preceding the given rectifier and assigned to the band increment passing in front of the respective anode supplied by the given rectifier.
  • the calculation of the current setpoint takes into account the experience of the band increment present in front of the anodes supplied by the rectifier.
  • At least one rectifier is always in operation, and this rectifier is the last rectifier which supplies an anode after which the metal strip face is covered with the intended metal coating.
  • each rectifier in operation receives a current setpoint greater than or equal to a predetermined minimum value.
  • the first rectifier which feeds an anode before which the metal strip face is not yet subjected to electrolytic deposition is still in operation and it receives a current setpoint equal to a predetermined value.
  • a steel tinning line upstream comprises a unwinding device 2, which unwinds coils of steel strip to be tin plated, a priori having different widths and lengths.
  • a welding device 3 splits the strips of metal from a coil at the end of unwinding and from a coil at the beginning of unwinding, in order to constitute a continuous steel strip 1.
  • the strip 1 passes through a loop tower 4 which comprises upper rollers 41 and lower rollers 42.
  • the strip 1 passes alternately over the upper and lower rollers, so that the loop tower acts as a strip accumulator.
  • the running of the strip is interrupted at the level of the welding device 3.
  • the lower rollers 42 of the loop tower 4 rise progressively towards the upper rollers 41, so as to reduce the amount of tape 1 accumulated and thus feed without interruption the part of the line downstream of the loop tower 4.
  • the running of the tape from the new reel to the loop tower 4 resumes, and the loop tower again accumulates a quantity of tape by gradually lowering the lower rollers.
  • the coil change and welding operations do not take place on the running of the strip downstream of the loop tower 4, which running remains continuous.
  • the strip 1 passes through a degreasing unit 5 and a stripping unit 6, in order to prepare the surface of the strip to be tin plated.
  • the strip 1 then passes through a tinning unit proper 7, which will be described in detail with reference to FIG. 2.
  • the strip enters a reflow device 8, in order to melt the tin to improve the bonding of tin and corrosion resistance.
  • the strip 1 then passes through a chemical treatment device 9 to passivate the tinned surface, for example by chromate. Passivation also improves resistance to corrosion and in particular the adhesion of varnish to the tinned surface.
  • the strip 1 then reaches a second loop tower 10 and then to a shearing and winding device 11, which winds the strip into coils.
  • the loop tower 10 acts as an accumulator opposite to that of the loop tower 4.
  • the shearing and winding device 11 finishes a reel, and before starting the next reel, the loop tower accumulates the tape to be wound until the winding device is ready to wind the next reel.
  • the tinned steel coils are then cut, shaped and assembled, for example to form food packaging.
  • the tinning unit 7 comprises N identical and successive tanks 711 to 71 N containing electrolyte, not shown, each tank constituting an elementary period of the unit 7.
  • N is a positive integer , equal for example to ten or eleven.
  • n being an integer index between 1 and N.
  • a deflector roller 721 to 72 N In the bottom of each tray is rotatably mounted a deflector roller 721 to 72 N under which continuously passes the strip 1 to be tin plated.
  • the rollers 721 to 72 N are made of non-conductive material.
  • second rollers 731 to 73 N + 1 of conductive material stretch the strip and transfer it successively to all the tanks.
  • the strip passes between two pairs of vertical anodes 741 and 751 to 74 N and 75 N , in the form of tin bars juxtaposed vertically in a support.
  • Each anode faces a length portion of one of the upper and lower faces of the strip which constitutes the cathode of the electrolytic reaction.
  • the rollers 731 to 73 N + 1 and therefore the strip 1 are referenced to the same cathode potential.
  • a rectifier R1 supplies direct current through a current divider 78, the pair of anodes 741 facing a portion of the underside of the strip, and the pair of anodes 751 facing d 'an upper face portion of the strip.
  • a controllable rectifier R n supplies the two anodes facing the underside of the strip and an analog rectifier Re n supplies the two anodes opposite the top face of the bandaged.
  • each of the two pairs of anodes in the first tank is supplied by a respective rectifier, in a similar manner to the following N-1 tanks.
  • each anode is supplied individually by a rectifier.
  • a device for measuring the running speed of the strip is arranged in the tinning unit 7.
  • a given face, upper or lower of the strip 1 is tinned by electrolytic reaction between the cathode, that is to say the strip, and the succession of anodes facing the face.
  • the electrolytic reaction between the strip face and the anode depends on the current supplied by the rectifier. Tinning on one side is independent of tinning on the other side, except for leakage currents.
  • the strip length developed in the tinning unit 7 between the upper end rollers 731 and 73 N + 1 is broken down into a series of N strip increments of fixed length.
  • the length of an increment is for example equal to the length of strip included between the horizontal upper tangents of two successive upper rollers 73 n and 73 n + 1 .
  • a strip increment is characterized by its width and by the coating thicknesses specified on the faces of the increment. This increment length is independent of the location of the anode pairs: for example, a pair of anodes for coating the underside of the strip is located opposite the bottom roller 72; or the pairs of anodes or the anodes extend horizontally in a single large tank and are distributed between rollers between which the metal strip travels horizontally.
  • a control circuit for controlling the rectifiers of the tinning unit 7 comprises a control unit 30, connected to the tinning unit 7, in order to receive measurement information for purposes displays and transmit commands, including regulating rectifiers.
  • the control unit is also connected to a programmable memory 31 in which the regulation algorithm and the values calculated by this program are stored.
  • the control unit is connected to an operator interface 32, comprising for example a screen, an alphanumeric keyboard and a printer, so that an operator enters data relating to the strip to be tinned and reads the various parameters in real time. tinning and data concerning the tape transmitted to memory 31 by computer means external to the control circuit.
  • the determination of the current setpoints of the rectifiers of the tinning unit 7 is explained below.
  • This algorithm comprises a first preset part E4O to E76, which determines the total current necessary to be applied to a tape face by l '' set of rectifiers, the number of rectifiers to be put into operation and the estimated current intensity delivered by each rectifier.
  • the algorithm includes a second calculation part E8O to E87 during which the setpoint of each rectifier is calculated as a function of the total current to be applied to the face and the current already applied by the preceding rectifiers.
  • the algorithm is run cyclically, according to a predetermined period, for example 500 ms, for each of the faces to be tinned.
  • the algorithm running period is fixed and is in particular independent of the fixed length of the strip increments or of the variable speed of travel of the strip in the tinning unit 7.
  • the algorithm for determining the total current to be applied, the number of rectifiers to be put into operation and the average current per rectifier in operation, for tinning a strip face comprises the following steps E40 to E43 .
  • WIDTH (n) and RSPECIFIE (n) depend on the strip to be tinned and the desired coating on the strip face.
  • IBUTEE (n) are defined by the operator for each rectifier and represent a current limitation (clamping) of the rectifiers.
  • the current tape speed VACTU is taken cyclically from the tape speed measuring device to be stored.
  • the cathodic yield table is stored in memory.
  • the DENS current density and the minimum DENSMIN current density are defined by the operator. These last two parameters are considered to improve the appearance of the tinned strip. In fact, phenomena called "white edges", for example, which are to be avoided, are linked to the current density received by the strip, independently of the total intensity received, therefore of the coating thickness.
  • Step E41 includes the calculation of the following products relating to the N increments of band 1 present in unit 7: WIDTH (n) x RSPECIFIED (n) for 1 ⁇ n ⁇ N, and the determination of the largest of these products , noted L x R.
  • the search for this larger product is justified by imposing an overcoat compared to an undercoat in the vicinity of a weld between two successive strips having to withstand different coating thicknesses.
  • B depends on the leakage current that exists between the two faces and on the coating rate specified on the face considered.
  • step E41 are also calculated current intensity values IDENS and IDENSMIN corresponding to the current densities DENS and DENSMIN from the width corresponding to the product L x R determined from RSPECIFIE (n) or as a variant RVISE ( not).
  • Step E42 includes the calculation of the total current which is necessary to carry out the coating of the most demanding increment, that is to say that corresponding to the product L x R:
  • step E42 is also calculated a number NBR of rectifiers to be put into operation, in addition to the first rectifier R1, in dependence on the total current calculated ITOTAL; the first rectifier must be put into operation and delivers the IBUTEE constant current intensity (1), and each following rectifier put into operation delivers the IDENS current intensity:
  • ENT designates the whole part of the quotient of the division (ITOTAL - IBUTEE (1)) / IDENS.
  • the decimal part of the previous division is designated by DEC.
  • decimal part DEC is equal to or greater than the ratio then the NBR number is increased by 1.
  • Step E43 includes the calculation of the average current intensity IMOY delivered by each of the rectifier NBRs put into operation, the first rectifier delivering IBUTEE (1):
  • step E43 the convergence of the calculations is also verified, by determining the cathode efficiency ⁇ 1 as a function of the current intensity IMOY and the number of rectifiers in NBR operation, with the cathode efficiency table TAB ( ⁇ ).
  • the calculations are restarted, starting from the calculation of ITOTAL (step E42), with the new value of cathodic efficiency ⁇ 1.
  • the values of ITOTAL, NBR and IMOY are recalculated and a new cathodic yield is determined from the table TAB ( ⁇ ); the calculations are restarted as many times as necessary to ensure convergence.
  • a threshold set at 0.05 two or three iterations are sufficient.
  • the calculation of ITOTAL, NBR and IMOY is carried out only once, with a fixed cathodic efficiency, for example equal to 1, and the convergence of the calculations is not verified. This variant, although less precise, does not require the table TAB ( ⁇ ).
  • the algorithm proceeds to the part for calculating the predicted current intensities of the rectifiers.
  • This part is composed of steps E5O to E54 to determine the forecast current intensities of the first and last rectifiers R1 and R N , of steps E6O to E64 to determine the forecast current intensities of the other rectifiers R2 to R N-1 , and from steps E7O to E76 to correct the forecast current intensities.
  • any rectifier R n with 1 ⁇ n ⁇ N can be in the following states.
  • the rectifier R n If the rectifier R n is in service, it can be not logged, it can then be selected without restriction by the algorithm to be put into operation, that is to say effectively deliver current.
  • the rectifier R n If the rectifier R n is in service, it can be logged, it will then be chosen by the algorithm to be put into operation only in case of absolute necessity, as will be explained below.
  • Working variables are initialized in step E51, as well as the values of the forecast current intensities delivered by the rectifiers R1 to R N : IPREV (n), with 1 ⁇ n ⁇ N.
  • Step E52 relates to the calculation of the forecast current IPREV (1) delivered by the first rectifier R1 of the tinning unit 7.
  • the first rectifier is always in operation, and delivers the constant current IBUTEE (1) defined by the operator and is therefore not regulated.
  • the first rectifier delivers the current IMOY, if the value IMOY is less than the value IBUTEE (1), or IBUTEE (1) otherwise. In both cases, the working variable INTAREPARTIR is updated.
  • Step E53 determines the forecast current intensity IPREV (N) supplied by the last rectifier of the tinning unit.
  • the current intensity IPREV (N) is equal to IMOY, if the value IMOY is less than the value IBUTEE (N), or equal to IBUTEE (N) otherwise.
  • the working variable CUMULDISPO is updated, taking into account the fact that a current intensity equal to IBUTEE (N) -IMOY can still be assigned to the rectifier R N if necessary, as it will be exposed in the continuation.
  • the working variable CUMULAREPARTIR is updated, taking into account that the current intensity equal to IMOY-IBUTEE (N) cannot be assigned to the rectifier R N , and remains to be distributed to the other rectifiers.
  • step E54 the working variables INTAREPARTIR, representing the current intensity remaining to be distributed, and NB, representing the number of rectifiers remaining to be tested, are updated.
  • the algorithm then proceeds to steps E6O to E64 to calculate the forecast current intensities of the other rectifiers R2 to R N-1 .
  • step E60 the parameter n is initialized to 2, corresponding to the rectifier R2, then in step E61 the variable INTAREPARTIR is compared to zero to find out whether current remains to be distributed. If the result is "no”, the flow of the algorithm goes directly to step E80 which is described below. If the result is "yes”, the on / off state and the set state or not of the rectifier R n are tested. If the rectifier R n is either out of service, or logged, then the algorithm goes to step E64. If the rectifier R n is in service and not logged, then the forecast current intensity IPREV (n) of the rectifier R n is calculated in step E62.
  • step E63 the current remaining to be distributed is updated, the number NB of rectifiers remaining to be tested is updated and tested.
  • step E70 If the number NB is zero, NBR rectifiers other than the rectifier R1 have been tested, and the algorithm proceeds to step E70 which is described below.
  • Step E64 increments the parameter n, and if n is less than or equal to the value N-1, that is to say if at least one rectifier remains to be tested, the algorithm is looped back to step E61 previously described. Otherwise, the algorithm goes to step E75 which is described below.
  • Step E62 for determining the forecast current intensities IPREV (n) is carried out as long as there is current to be distributed, according to step E61, as long as the number NBR of rectifiers to be put into operation is not reached according to step E63, and as long as all the rectifiers R2 to R N-1 have not been tested according to step E64.
  • the estimated current intensities calculated IPREV (n) with 1 ⁇ n ⁇ N are stored.
  • Certain IPREV (n) current intensity may be zero, for example when a rectifier is out of service, or when NBR + 1 is strictly less than N.
  • steps E70, E71, E72, E73 and E74 are traversed when the number of rectifiers to be put into operation is reached and the current to be distributed could not be fully distributed on the rectifiers in operation, i.e. when CUMULAREPARTIR remains strictly positive, and when the rectifiers already in operation are still available to deliver the current of current remaining to be distributed, that is to say that the value of CUMULDISPO is greater than or equal to CUMULAREPARTIR.
  • the current intensity distribution then consists in saturating rectifiers in operation at their respective value IBUTEE (n) from the rectifier R2.
  • the variable n is initialized to 2 in step E71 to perform all of the steps E72, E73 and E74, rectifier by rectifier, from rectifier R2.
  • step E72 the calculated predicted current intensity IPREV (n) is tested; if it is zero, the rectifier R n is not in operation and n is incremented by 1 to go to the next rectifier. If the current IPREV (n) is not zero, step E73 checks whether the current intensity remaining to be distributed CUMULAREPARTIR is greater than or equal to what it is still possible to assign to the rectifier R n , that is ie IBUTEE (n) -IPREV (n). Depending on the result of step E73, the forecast current intensity IPREV (n) is recalculated in step E74.
  • step E80 If the current intensity remaining to be distributed CUMULAREPARTIR is no longer less than the value IBUTEE (n) -IPREV (n), then the current intensity IPREV (n) is increased by the value CUMULAREPARTIR. Thus, there is no longer any current intensity to distribute and the calculation of the forecast current intensities IPREV (n) is finished.
  • the algorithm goes to step E80, which is described below.
  • step E70 checks whether rectifiers are registered. If the result is positive, step E76 deconsigns all the recorded rectifiers from R2 to R N-1 .
  • step E76 the calculation is resumed in step E51, either with all the rectifiers disconnected, or with new values of NBR and IMOY.
  • step E80 the current intensity setpoint IREF (1) of the first rectifier R1 is equal to IBUTEE (1) since, as already explained according to this preferred embodiment, no regulation is provided for this rectifier which always operates in fixed current.
  • the intensity / speed ratio [I / V] REF (1) IBUTEE (1) / VACTU of the first rectifier is calculated then is memorized band increment by band increment during the unwinding of the band; in other words this ratio is applied to the band increment present in front of the anodes supplied by the rectifier R1.
  • the "lived" deposition ratio [I / V] VECU (n) is associated with each band increment, which is representative of the previous successive deposits on the increment and which is equal to the sum of the ratios [I / V] REF (i), with 1 ⁇ i ⁇ n-1, that the increment opposite the anodes 74 n or 75 n supplied by the rectifier R n has "received” from the previous rectifiers.
  • the ratio [I / V] VECU (n) can be the sum of the means of each term [I / V] REF (i), with 1 ⁇ i ⁇ n-1.
  • the current intensity setpoints IREF (n) for 2 ⁇ n ⁇ N-1 are calculated from step E81. All the following calculations are carried out successively from rectifier R2 to rectifier R N-1 . As a variant, the order of the calculations can be reversed. Step E81 initializes the calculation for the rectifier R2. Then step E82 tests whether the predicted current intensity IPREV (n) of the rectifier R n , with 2 ⁇ n ⁇ N-1, calculated and finally memorized in step E62 or E74, is positive.
  • step E83 If the value IPREV (n) is zero, then the rectifier R n is not in operation, and the values IREF (n) and [I / V] REF (n) are zero (step E83). The calculation for the rectifier R n is finished, and n is incremented by 1 (step E86) and if n is not equal to N, the calculation is restarted from step E82.
  • step E83 determines the value of [I / V] VECU (n) which is the sum of the terms [I / V] REF (i), 1 ⁇ i ⁇ n-1, that the increment opposite the anodes 74 n or 75 n supplied by the rectifier R n has "received” from the previous rectifiers R1 to R n-1 . Then, the current intensity setpoint IREF (n) is then equal to the product of the difference between [I / V] VISE (n) and [I / V] VECU (n) by the measured running speed VACTU, reduced by IPREV (N).
  • [I / V] VISE (n) is equal to (kx WIDTH (n) x R (n)) / ⁇ , where the value of R (n) is worth RSPECIFIE (n) or RVISE (n) according to the variants.
  • IPREV (N) results from the fact that the rectifier R N is always in operation.
  • the IREF (n) setpoint can be limited to an IMTMAX (n) value, which designates the maximum current flowable by the rectifier R n , which can be saturated in voltage.
  • the value [I / V] REF (n) is calculated in step E85 and equals IREF (n) / VACTU.
  • the value [I / V] REF (n) is memorized band increment by band increment, that is to say it is assigned to the band increment present in front of the anodes supplied by the rectifier R n .
  • the value [I / V] REF (n) is used to calculate the value of [I / V] LIVE (n + 1) , as previously discussed.
  • step E86 the parameter n is incremented by 1 to go to the next rectifier, and if n is not equal to N, the calculation for the next rectifier starts from step E82.
  • Step E87 determines the "lived" [I / V] VECU (N) which is the sum of the terms [I / V] REF (i), with 1 ⁇ i ⁇ N-1, that the increment opposite the 74 N or 75 N anodes supplied by the rectifier R N received previous rectifiers. Then the current intensity setpoint IREF (N) of the last rectifier R N in unit 7 is calculated.
  • the setpoint IREF (N) is equal to ([I / V] VISE (N) - [I / V] VECU (N)) x VACTU .
  • the term [I / V] VISE (N) is (kx WIDTH (N) x R (N)) / ⁇ , where R (N) is RSPECIFIE (N) or RVISE (N), according to the variants.
  • the IREF (N) setpoint is never zero, and must be between IDEMSMIN, minimum intensity determined in step E41, and IBUTEE (N). If IREF (N) leaves this range by lower value, respectively higher, then the value IDENSMIN, respectively IBUTEE (N), is assigned to it. After calculating IREF (N), the term [I / V] REF (N) is determined. When all the current intensity setpoints have been calculated, the setpoints are applied to the rectifiers.
  • step E4O Another cycle, typically 5OO ms, is again implemented from step E4O.
  • the regulation method according to the invention is twofold when coatings, different or not, are to be deposited on the two faces of the metal strip.
  • Each of the two processes takes place in parallel with the other and is associated with respective initial parameters, such as RSPECIFIE, IBUTEE, DENS, DENSMIN, etc., relating to the coating itself and to the rectifiers connected to the anodes opposite the associated strip face.
  • the regulation method according to the invention has been described with reference to a tinning line, but it applies to any type of electrolytic deposition, such as electrogalvanizing.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
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EP94200729A 1993-04-22 1994-03-22 Verfahren zur Einstellung der Elektroplattierung eines Metallbandes Revoked EP0621353B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9304878A FR2704241B1 (fr) 1993-04-22 1993-04-22 Procede de regulation d'electro-deposition sur une bande de metal.
FR9304878 1993-04-22

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Publication Number Publication Date
EP0621353A1 true EP0621353A1 (de) 1994-10-26
EP0621353B1 EP0621353B1 (de) 1996-12-11

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EP94200729A Revoked EP0621353B1 (de) 1993-04-22 1994-03-22 Verfahren zur Einstellung der Elektroplattierung eines Metallbandes

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US (1) US5421986A (de)
EP (1) EP0621353B1 (de)
JP (1) JPH06346296A (de)
AT (1) ATE146231T1 (de)
CA (1) CA2120080A1 (de)
DE (1) DE69401086D1 (de)
FR (1) FR2704241B1 (de)

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AT405060B (de) * 1996-04-12 1999-05-25 Andritz Patentverwaltung Verfahren und vorrichtung zur elektrolytischen behandlung von durchlaufendem gut
EP1881091A1 (de) * 2006-07-21 2008-01-23 Enthone, Inc. Verfahren und Vorrichtung zur Kontrolle von Abscheideergebnissen auf Substratoberflächen

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6726825B2 (en) * 2000-04-07 2004-04-27 Matsushita Electric Industrial Co., Ltd. Method and apparatus for manufacturing positive electrode foil of aluminum electrolytic capacitor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2590278A1 (fr) * 1985-11-19 1987-05-22 Usinor Procede et dispositif de regulation de la quantite d'un metal depose par voie electrolytique sur une bande defilant en continu

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4240881A (en) * 1979-02-02 1980-12-23 Republic Steel Corporation Electroplating current control
JPS58140820A (ja) * 1982-02-16 1983-08-20 Nippon Steel Corp メツキ電流自動切換制御装置
US4604414A (en) * 1983-03-31 1986-08-05 Sumitomo Chemical Company, Limited Antistatic acrylic resin composition and method for the production thereof
JPS60128298A (ja) * 1983-12-16 1985-07-09 Nippon Steel Corp メツキ電流自動切換制御装置
JPS60128295A (ja) * 1983-12-16 1985-07-09 Nippon Steel Corp メツキ電流自動補償制御装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2590278A1 (fr) * 1985-11-19 1987-05-22 Usinor Procede et dispositif de regulation de la quantite d'un metal depose par voie electrolytique sur une bande defilant en continu

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405060B (de) * 1996-04-12 1999-05-25 Andritz Patentverwaltung Verfahren und vorrichtung zur elektrolytischen behandlung von durchlaufendem gut
EP1881091A1 (de) * 2006-07-21 2008-01-23 Enthone, Inc. Verfahren und Vorrichtung zur Kontrolle von Abscheideergebnissen auf Substratoberflächen

Also Published As

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EP0621353B1 (de) 1996-12-11
FR2704241B1 (fr) 1995-06-30
FR2704241A1 (fr) 1994-10-28
CA2120080A1 (en) 1994-10-23
DE69401086D1 (de) 1997-01-23
ATE146231T1 (de) 1996-12-15
JPH06346296A (ja) 1994-12-20
US5421986A (en) 1995-06-06

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