EP4010516A1 - Verfahren und anlage zum elektrolytischen beschichten eines elektrisch leitfähigen bandes und/oder gewebes mittels pulstechnik - Google Patents
Verfahren und anlage zum elektrolytischen beschichten eines elektrisch leitfähigen bandes und/oder gewebes mittels pulstechnikInfo
- Publication number
- EP4010516A1 EP4010516A1 EP20751554.5A EP20751554A EP4010516A1 EP 4010516 A1 EP4010516 A1 EP 4010516A1 EP 20751554 A EP20751554 A EP 20751554A EP 4010516 A1 EP4010516 A1 EP 4010516A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tape
- pulse
- electrically conductive
- anode
- coating
- 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- Withdrawn
Links
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
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/007—Current directing devices
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/10—Electrodes, e.g. composition, counter electrode
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/18—Electroplating using modulated, pulsed or reversing current
-
- 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
- C25D7/0657—Conducting rolls
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/565—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of zinc
Definitions
- the present invention relates to a galvanic method and a system for the electrolytic coating of an electrically conductive tape and / or an electrically conductive tape-shaped fabric, preferably a metallic tape, such as a steel tape and / or a sheet, a plastic tape, a fiberglass fabric tape, a
- Electrolytically refined strips such as steel strips, are now used as semi-finished products in many branches of industry, such as the automotive industry, aerospace technology, mechanical engineering, the packaging industry, and household and electrical appliance manufacture.
- the production of such strips is traditionally carried out in continuously operating strip treatment systems with a constant-speed passage of the strip through one or more electrolysis cells connected in series.
- the coatings deposited electrolytically on one or both sides of the strip can perform various tasks and give the respective strip new product properties. These are, for example, protection against corrosion or oxidation, wear protection, the production of decorative product properties, and / or the production of magnetic and / or electrical surface properties.
- the zinc coating gives an electrolytically galvanized steel strip an active protection against corrosion and offers a good primer for painting and / or laminating with plastic films.
- Chromium coating also gives a steel strip or a plastic strip increased protection against corrosion and wear, as well as decorative properties.
- Nickel and nickel alloys can be
- the production of the respective coatings with the desired properties depends, especially under economic and economic aspects, on various parameters such as the type and composition of the electrolyte, its metal salt concentration and temperature, the geometric arrangement of the electrolysis cells and their electrodes, the electrochemical current flow and their Amount, time and polarity, strongly dependent.
- the electrolytic coating of metallic strips is carried out in the prior art by means of direct current, the thyristor technology being used here.
- This so-called DC electrolysis can be designed to be unipolar and partially reversible, but does not allow any specific current sequences in terms of amount, time and polarity.
- the deposition of the metallic and / or semi-metallic component on the strip edges of the respective strip substrate proves to be particularly problematic. These elevations can lead to cracking edges and pressure deformations in the finished strip coil.
- Another problem is dendritically grown peaks on the strip edges, which detach themselves from the strip as coarse particles during the coating process, contaminate the electrolyte in particles and then settle or deposit on the strip surface, which is undesirable in terms of surface quality.
- edge masks are preferably used. These, however, have to be adjusted to the respective bandwidth by a motorized adjustment sensor and therefore pose a high risk of malfunction and collision associated with long downtimes Furthermore, the use of these edge masks requires a lot of time in terms of maintenance and servicing.
- the object of the present invention is therefore an improved method and an improved system for the electrolytic coating of electrically conductive strips and / or electrically conductive strip-shaped fabrics with a coating based on a metal and / or a semimetal selected from group 6 to 15 and / or a mixture thereof
- the object is achieved by a method with the features of patent claim 1 and a system with the features of patent claim 12.
- the electrically conductive tape and / or the electrically conductive tape-shaped fabric preferably a metallic tape, a plastic tape, a glass fiber fabric tape, a carbon mesh fabric tape and / or a
- Composite material thereof after possibly prior cleaning and / or activation, is fed to a coating section comprising at least one, preferably at least two or more, electrolytic cell (s) and is successively electrolytically coated in this, the electrically conductive strip and / or the strip-shaped fabric is first connected cathodically via at least one current roller and is guided within the at least one electrolytic cell at a defined distance parallel to the at least one anode arranged in the electrolytic cell.
- the at least one anode is energized by means of a modulated current, the coating process taking place within the coating section using a defined pulse pattern sequence which is formed from at least one pulse pattern, wherein according to FIG Pulse pattern sequence of at least one of the metals and / or one of the semimetals selected from group 6 to 15 and / or a mixture thereof from an electrolyte is deposited on the electrically conductive tape and / or tape-like fabric and the coating is formed.
- the present invention provides an installation for the electrolytic coating of an electrically conductive strip and / or an electrically conductive strip-shaped fabric.
- the system optionally includes a cleaning and / or an activation unit in which the electrically conductive tape and / or fabric can be cleaned and / or activated; a coating line with at least one, preferably at least two or more electrolytic cell (s), in which the electrically conductive tape and / or fabric can be successively electrolytically coated, and at least one power roller, via which the electrically conductive tape and / or tape-like fabric are cathodically connected can, wherein the at least one electrolytic cell comprises at least one anode which is arranged such that the electrically conductive tape and / or tape-like fabric that can be passed through the at least one electrolysis cell can be passed through at a defined and parallel distance from the at least one anode.
- the system comprises at least one pulse rectifier which is implemented using switched-mode power supply technology, the negative pole of which is electrically connected to the at least one current roller and the positive pole is electrically connected to the at least one anode, in such a way that the at least one anode can be energized by means of a modulated current, that the coating process can be carried out within the coating section using a defined pulse pattern sequence, the pulse pattern sequence being formed from individual pulse patterns, with at least one of the metals and / or one of the semimetals selected from group 6 to 15 and / or a mixture thereof according to the pulse pattern sequence can be deposited from an electrolyte on the electrically conductive tape and / or the tape-shaped fabric.
- the deposition rate can be significantly reduced locally at locations with high current density, so that the cumbersome installation of edge masks, as is common in the prior art, and their tracking positioning can be dispensed with due to changes in the band width and / or trimming of the band edges.
- Changing the polarity allows the deposition process to be reversed.
- those areas of the (partially) coated substrate can be corrected that are higher as a result in the previous cathodic coating step and / or coating process
- the coating process according to the invention takes place within the coating section using a defined pulse pattern sequence that is formed from individual pulse patterns.
- the pulse pattern sequence can be formed from a single pulse pattern and / or from a combination of at least two or a plurality of different pulse patterns of a pulse pattern library.
- the electrolytic process can be designed using the modulated current in such a way that particularly compact, dense, pure, homogeneous, finely crystalline, pore-free, crack-free and dendrite-free coatings can be realized.
- the electrically conductive tape and / or tape-shaped fabric to be coated can be used in the continuous coating process be coated over its entire surface with a homogeneous layer thickness, which in particular runs uniformly over the entire strip width, that is to say also at the strip edges, and has no partial overcoating and / or undercoating.
- the use of a modulated current in bipolar operation leads to a multilayer structure with improved properties.
- the pulse pattern the nucleation, its number and distribution on the electrically conductive tape and / or tape-shaped tissue can be positively influenced in a targeted manner, which leads to advantageous crystal growth.
- the Nernst diffusion layer can also be split up by repeating pulse patterns, which leads to an improvement in the mass transport properties at the cathode, i.e. the electrically conductive tape and / or tape-like tissue connected to the cathode, and manifests itself in the deposition of less rough coatings, increasing their gloss and making them denser Coatings and thus leads to an increase in corrosion resistance.
- the metal ions and / or semimetal ions can be transported in greater numbers to the cathodically connected tape and / or tape-like tissue, which leads to a finer-grained morphology of the coating.
- metal and / or semi-metal which can be selected individually or in combination from one of groups 6 to 15, includes the metals or semi-metals known in electroplating, in particular chromium (Cr), manganese (Mn), rhenium ( Re), iron (Fe), ruthenium (Ru), osmium (Os), cobalt (Co), rhodium (Rh), iridium (Ir), nickel (Ni), palladium (Pd), platinum (Pt), copper ( Cu), gold (Au), silver (Ag), zinc (Zn), cadmium (Cd), aluminum (AI), gallium (Ga), indium (In), thallium (TI), tin (Sn), lead ( Pb), arsenic (As), antimony (
- the electrically conductive band and / or electrically conductive band-shaped fabric is preferably one selected from the group comprising a metallic band, such as a steel band and / or a sheet metal, a plastic band, a glass fiber fabric band, a carbon mesh fabric band and / or a composite material thereof.
- the electrically conductive tape is particularly preferably a steel tape which has a tensile strength of at least R e ⁇ 500 MPa, more preferably of at least R e ⁇ 600 MPa and most preferably of at least R e ⁇ 800 MPa.
- the steel strip is limited to a tensile strength of R e ⁇ 2000 MPa, more preferably to a tensile strength of R e ⁇ 1500 MPa, even more preferably to a tensile strength of R e ⁇ 1200 MPa.
- the coating section of the system can in principle comprise an electrolysis cell with an anode, which is designed, for example, in the form of a plate anode.
- the only one electrolysis cell can comprise two anodes, which are arranged one behind the other in the direction of belt travel, for example, in such a way that the strip-shaped substrate can be coated on one side.
- the two anodes can be formed in an anode arrangement in which the two anodes are then arranged parallel to one another within the one electrolysis cell.
- the coating line comprises at least two electrolysis cells, more preferably at least three electrolysis cells, even more preferably at least four electrolysis cells, further preferably at least five electrolysis cells, and for reasons of process economy it is limited to a maximum of twenty electrolysis cells, preferably a maximum of 16, more preferably a maximum of 15 Electrolysis cells limited.
- the plurality of electrolysis cells are preferably arranged one behind the other in the direction of travel of the strip, through which the electrically conductive strip and / or strip-shaped fabric is then guided within the coating section.
- the individual electrolysis cells can be designed in the form of horizontally or preferably in the form of vertically designed electrolysis cells through which the corresponding substrate to be coated is guided over deflection rollers.
- the deposition process within the individual electrolysis cells takes place in an electrolyte through which the electrically conductive tape and / or tape-shaped fabric is passed.
- the electrolyte medium is usually aqueous and usually has a pFI value of less than 5.0.
- the electrolyte medium can also be formed from a non-aqueous medium such as an ionic liquid.
- a preferred ionic liquid comprises a mixture of choline chloride and flarnea.
- the modulated current is provided by a pulse rectifier that uses switched-mode power supply technology.
- a pulse rectifier allows the amount, the temporal progression and the polarity of the respective desired pulse pattern and thus the entire pulse pattern sequence to be defined so that the electrolytic process corresponds to the given parameters can be optimally adapted to the respective system of tape substrate and coating agent.
- a pulse rectifier designed in this way is defined in that the mains-side alternating voltage is first rectified and smoothed.
- the DC voltage then generated which has significantly higher frequencies, usually in the range from 5 kHz to 300 kHz, is then divided, transformed with this high frequency and then rectified and screened.
- the superimposed voltage and current regulation usually works via pulse width modulation or pulse phase modulation.
- the transformer Due to the high frequency at the power transmitter, the transformer is made much smaller so that the energy losses are much lower. Depending on the system, this results in a significantly higher power efficiency of the direct current supply and thus of the entire production plant.
- the pulse rectifier can be made available in a modular design. This leads to a significantly higher availability, since the performance to be provided by a defective module can be taken over by another module and when a defective module is repaired, it can be quickly replaced.
- Another advantage is that the quality of the direct current, in particular its lower residual ripple, is significantly better with lower losses than with conventional thyristor-based DC electrolysis, the
- the at least one pulse rectifier which provides the modulated current, is advantageously electrically connected via its negative pole to the at least one current roller and the positive pole to the at least one anode.
- the at least one pulse rectifier which provides the modulated current, is advantageously electrically connected via its negative pole to the at least one current roller and the positive pole to the at least one anode.
- Pulse rectifier particularly preferably each of the pulse rectifiers within the coating section, is electrically connected to a central control unit via which the entire coating process is regulated.
- the at least one pulse pattern of the pulse pattern sequence is transmitted via the control unit to the at least one, preferably each, pulse rectifier, which transmits this signal to the respective associated electrolysis cell.
- a pulse pattern of the pulse pattern sequence comprises at least one cathodic pulse, at least one anodic pulse, and / or at least one pulse off-time, the cathodic and anodic pulse being defined by a pulse duration and its respective shape, for example rectangular.
- the at least one anode is preferably designed as a plate anode.
- Such plate anodes can in principle be designed in the form of a soluble or an insoluble anode.
- soluble anodes which are also known as active anode systems
- insoluble anodes also known as inert anode systems
- Insoluble anodes consist of a carrier material on the one hand and a coating applied to it, which can be referred to as an active layer, on the other hand. Titanium, niobium or other reaction carrier metals are usually used as the carrier material, but in any case those materials which passivate under the electrolysis conditions.
- the material used for the active layer is usually electron-conducting materials, such as platinum, iridium or other noble metals, their mixed oxides or compounds of these elements.
- the active layer can either be applied directly to the Be applied to the surface of the carrier material or be located on a substrate arranged at a distance from the carrier material.
- Materials which can be used as carrier material for example titanium, niobium or the like, can also serve as the substrate.
- the at least one anode can preferably be formed in one piece and / or, according to an advantageous embodiment variant, from at least two or more rod-shaped partial anodes, each of the partial anodes then being electrically connected to the power source.
- the at least two or more rod-shaped partial anodes are advantageously arranged in such a way that the distance between each partial anode and the strip can be adjusted across its width.
- locally different layer thicknesses can be applied and / or corrected by desorption along the bandwidth of the substrate, i.e. the electrically conductive tape and / or tape-like fabric, by setting the distance of each of the sub-anodes to the tape and / or the current density via the pulse rectifier .
- the partial anodes arranged on the strip edges can be supplied with a lower current density than those arranged in the middle segment and / or positioned a greater distance from the strip in order to control the deposition of the metal and / or the semi-metal at the strip edges .
- the at least one electrolysis cell comprises at least one anode arrangement made up of two anodes arranged parallel to one another, through which the electrically conductive tape and / or tape-shaped fabric is guided.
- each of the anodes of the at least one anode arrangement is supplied with current via a separate pulse rectifier, in such a way that each of the anodes is electrically connected to a positive pole of each pulse rectifier and the negative pole of each pulse rectifier is electrically connected to the at least one current roller is.
- Electrolysis cell in this configuration has two anodes, two pulse rectifiers and a current roller, via which the strip substrate is connected cathodically.
- the at least one electrolysis cell comprises at least two anode arrangements, each with two anodes arranged parallel to one another, through which the electrically conductive tape and / or tape-shaped fabric is guided.
- an electrolysis cell is designed as an immersion tank, it is particularly preferred that the electrically conductive tape and / or tape-like fabric is deflected between the at least two anode arrangements via a deflection roller, possibly arranged within the electrolysis cell.
- each of the anodes of the at least two anode arrangement is also supplied with current via a separate pulse rectifier, so that a total of four pulse rectifiers are provided in this configuration.
- the electrolysis cell in this configuration comprises four anodes, four pulse rectifiers, two current rollers and a deflection roller, possibly arranged within the electrolysis cell.
- the electrolysis cell can essentially be formed from the anode arrangement in that the two open flanks of this are closed.
- the strip substrate is guided through the partially closed space delimited by the anode arrangement and the electrolyte flows around it in this space.
- the electrolyte can, for example, be supplied to the space over the entire cross section via appropriate pumps and flow through it.
- Such a structure has a smaller installation space than an immersion tank and therefore requires smaller volumes of the electrolyte.
- the electrolyte can, for example, be supplied to the space over the entire cross section via appropriate pumps and flow through it.
- Coating section a plurality of electrolysis cells arranged one behind the other in the direction of travel of the strip, through which the electrically conductive strip and / or strip-shaped fabric is guided.
- the electrically conductive tape and / or tape-shaped fabric is deflected between at least two, more preferably between each of the plurality of electrolysis cells, via at least one deflection roller designed as an intermediate current roller, and optionally also connected cathodically.
- each of the anodes of the four anode arrangements is also supplied with current via a separate pulse rectifier, so that a total of eight pulse rectifiers are provided in this configuration.
- Each of the eight anodes is electrically connected to a positive pole of each pulse rectifier.
- the cathodic circuit it is provided that it is distributed over a total of three current rollers, in such a way that the negative pole of two pulse rectifiers each with one of the two outer current rollers (strip inlet current roller and strip outlet current roller) and the negative pole of the other four pulse rectifiers is electrically connected to the deflecting roller designed as an intermediate current roller.
- FIG. 2 shows a second variant embodiment of part of FIG
- Coating section of the system for electrolytic coating of an electrically conductive strip and / or strip-shaped fabric with a coating in a schematic representation
- FIG. 3 shows a variant of a part of the coating section with n-cells
- FIG. 4 shows a variant of a partial anode arrangement
- FIG. 5 shows a third embodiment variant of a part of the coating section of the system for electrolytically coating an electrically conductive strip and / or strip-shaped fabric with a coating in a schematic representation
- FIG. 6 shows a first variant of a pulse pattern that can form part of the pulse pattern sequence
- FIG. 7 shows a second variant of a pulse pattern that can form part of the pulse pattern sequence
- FIG. 10 shows a fifth embodiment variant of a pulse pattern which can form part of the pulse pattern sequence
- FIG. 11 shows a sixth variant embodiment of a pulse pattern which can form part of the pulse pattern sequence.
- part of a coating line 1 of a system for the electrolytic coating of an electrically conductive strip and / or a strip-shaped fabric with a coating is shown in a schematic representation.
- such a system can have one or more flasher devices for unwinding and winding up the tapes to be coated, an infeed store, a straightener, a cleaning and activation unit, the coating line 1, a post-treatment unit, an outfeed store, an inspection line and one in front of the winding station (Flaspel Hughes) arranged oiling device comprise.
- an electrically conductive band and / or a band-shaped fabric 2 such as a metallic band, a steel band, an aluminum band, a plastic band, a plastic film, a glass fiber fabric, a carbon mesh fabric and / or a composite material thereof with a Coating based on a metal and / or a semi-metal selected from group 6 to 15 and / or a mixture or alloy thereof can be electrolytically coated.
- the coating line 1 in the variant shown in FIG. 1 comprises an electrolysis cell 3, which in the present case is designed as an immersion tank and has a correspondingly electrochemically adjusted electrolyte 4 containing the (semi) metallic component in cationic form.
- a sulfuric acid, aqueous electrolyte with a concentration of 100 to 400 g / L ZnSC can be used to coat a steel strip with zinc.
- the electrolytic cell 3 comprises two anodes 5, which are positioned in the electrolytic cell 3 in such a way that the strip 2 to be coated, which can be passed through the electrolytic cell 3, can be passed through at a defined and parallel distance therefrom.
- Both anodes 5 are designed as one-piece plate anodes and are arranged one behind the other in the direction of travel R of the belt, such that the belt 2 can be coated on one side.
- the electrolytic cell 3 is assigned two current rollers 6, 7, with the first current roller 6 being arranged within the coating section 1 on the inlet side (strip inlet current roller) of the electrolytic cell 3 and the second current roller 7 on the outlet side (strip outlet current roller) of the electrolytic cell 3.
- the strip 2 which may have been subjected to a previous cleaning and / or activation step, is deflected from a horizontal movement into a vertical movement via the strip infeed current roller 6, so that it enters the electrolytic cell 3, and at the same time connected to the cathode .
- the tape outlet current roller 7 the tape 2 is then after
- the coating process is diverted from the vertical back to the horizontal movement, whereby it can optionally also be connected cathodically via the strip outlet current roller 7.
- a deflection roller 8 is arranged within the electrolysis cell 3, via which the strip 2 is deflected.
- both anodes 5 are energized by means of a modulated current which is provided by a separate pulse rectifier 9, which is implemented using switched-mode power supply technology.
- Each of the pulse rectifiers 9 is electrically connected to one of the two current rollers 6, 7 via its negative pole and the positive pole is electrically connected to one of the two anodes 5.
- the two anodes 5 are connected to the modulated current Can be energized in such a way that the coating process can be carried out using a defined pulse pattern sequence 10 which is formed from individual pulse patterns 11.
- Both pulse rectifiers 9 are advantageously electrically connected to a central control unit 12, via which the respective desired pulse pattern 13 of the pulse pattern sequence 12 can be transmitted to each of the pulse rectifiers 10, 11. This allows the entire coating process to be regulated in an automated manner
- FIG. 2 a second variant of a part of the coating line 1 is shown.
- the electrolytic cell 3 comprises two anode arrangements 13, each with two anodes 5 arranged parallel to one another, through which the strip 2 is guided.
- each of the anodes 5 of the two anode arrangements 13 is also supplied with current via a separate pulse rectifier 9.
- each of the four anodes 5 is electrically connected to a positive pole of each pulse rectifier 9 and the negative pole of two pulse rectifiers 9 is electrically connected to one of the two current rollers 6 and 7, respectively.
- FIG. 3 shows a variant of a part of a coating line 1 with n-type electrolysis cells 3, four of which are shown by way of example. All of these electrolysis cells 3 are arranged one behind the other in the direction R of the strip.
- a deflecting roller designed as an intermediate current roller 14 is arranged, via which the strip 2 is deflected from a previous to the next electrolytic cell 3 and is additionally connected cathodically.
- each of the anodes 5 of the plurality of anode arrangements 13 is supplied with current via a separate pulse rectifier 9.
- each of the anodes 5 is electrically connected to a positive pole of each pulse rectifier 9.
- the cathodic circuit With regard to the cathodic circuit, it is provided that it relates to the different power rollers 6, 7, 14 distributed in such a way that the negative pole of two pulse rectifiers 9 each with one of the two outer power rollers 6, 7 (strip inlet or strip outlet current roller) and the negative pole of the other pulse rectifiers 9 with the one designed as an intermediate current roller 14 Pulley is electrically connected.
- FIG. 4 shows a variant of a partial anode arrangement 15 which comprises a plurality of rod-shaped partial anodes 16, each of the partial anodes 16 being electrically connected to the power source or to a negative pole of a pulse rectifier 9.
- Figure 5 is a third variant embodiment of part of a
- the electrolysis cell 3 is essentially formed from the anode arrangement 13 in that the two open flanks of this are closed.
- the strip 2 is guided through the partially closed space delimited by the anode arrangement 13 and the electrolyte 4 flows around it in this space.
- the electrolyte 4 is conveyed from a reservoir 17 arranged below the anode arrangement 13 via a pump 18 into the space, where it flows through it over the entire cross section.
- FIGS. 6 to 11 different embodiment variants of pulse patterns 11 are shown, which form part of the pulse pattern sequence 10 according to which the coating process takes place within the coating section 1.
- an initial current pulse of the time length t is shown, which is then reduced to a constant current strength.
- the initial current pulse can be used to increase the number of nuclei on the cathode, with the result that fine and small crystal forms are deposited.
- the dashed line in FIGS. 6 to 11 shows a cathodic current that is constant over time, as is used in direct current electrolysis (DC electrolysis).
- FIG. 7 shows a pulse pattern 11 which initially has a high bias current pulse, which is followed by a first, higher, and a second, lower, constant amount of current.
- FIG. 8 an embodiment variant is shown which shows a repetitive pulse pattern 11 of identical design in terms of current amount and time.
- the pauses in the current flow result in a relaxation of the Nernst double layer, which is associated with a breakdown of the diffusion layer that hinders the transport of substances and thus supports the formation of a homogeneous coating thickness over the surface of the strip.
- a pulse pattern 11 which has two consecutive, higher current pulses which are used cyclically within the pulse pattern 11 in order to minimize and / or suppress dendritic crystal growth.
- FIG. 10 shows a pulse pattern 11 which shows high current pulses, phases of cathodic deposition, and an inversion of the current and thus the connection of the cathode to the anode.
- FIG. 10 shows a pulse pattern 11 which shows high current pulses, phases of cathodic deposition, and an inversion of the current and thus the connection of the cathode to the anode.
- FIG. 11 shows a pulse pattern 11 with a periodic, square-wave current pulse which can be used in combination with one of the preceding pulse patterns to form a multilayer, cathodic coating.
- the coating is galvanically deposited on the strip in the cathodic phase, then applied anodically by the reverse pulse with currents lower in magnitude, and the deposition is prevented.
- crystal peaks are preferably broken down and, again by cathodic switching, another (semi) metal layer is deposited on the existing layer.
- the (semi-) metallic coatings can be built up periodically and in layers, which is associated with an improvement in the corrosion resistance.
- This so-called reverse pulse current method is also called the bipolar pulse current method, since the cathodic and anodic current conduction is changed, i.e. the current flow is changed with the intersection of the zero crossing.
- the cathode is temporarily switched to the anode, so that the galvanic deposition process can temporarily be carried out reversibly.
- the amount of current, the duration and the polarity change can be designed according to the specifications by the user and optimized for the process.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019211719 | 2019-08-05 | ||
| DE102019219496 | 2019-12-12 | ||
| DE102019219455 | 2019-12-12 | ||
| DE102019219490 | 2019-12-12 | ||
| DE102019219491 | 2019-12-12 | ||
| PCT/EP2020/072045 WO2021023789A1 (de) | 2019-08-05 | 2020-08-05 | Verfahren und anlage zum elektrolytischen beschichten eines elektrisch leitfähigen bandes und/oder gewebes mittels pulstechnik |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4010516A1 true EP4010516A1 (de) | 2022-06-15 |
Family
ID=71950652
Family Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20751554.5A Withdrawn EP4010516A1 (de) | 2019-08-05 | 2020-08-05 | Verfahren und anlage zum elektrolytischen beschichten eines elektrisch leitfähigen bandes und/oder gewebes mittels pulstechnik |
| EP20768503.3A Withdrawn EP4010517A1 (de) | 2019-08-05 | 2020-08-05 | Verfahren und anlage zum elektrolytischen beschichten eines stahlbandes mittels pulstechnik |
| EP20751551.1A Withdrawn EP4010515A1 (de) | 2019-08-05 | 2020-08-05 | Verfahren und anlage zum elektrolytischen beschichten eines elektrisch leitfähigen bandes und/oder gewebes mittels pulstechnik |
| EP20751549.5A Pending EP4010518A1 (de) | 2019-08-05 | 2020-08-05 | Verfahren und anlage zum elektrolytischen beschichten eines elektrisch leitfähigen bandes und/oder gewebes mittels pulstechnik |
Family Applications After (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20768503.3A Withdrawn EP4010517A1 (de) | 2019-08-05 | 2020-08-05 | Verfahren und anlage zum elektrolytischen beschichten eines stahlbandes mittels pulstechnik |
| EP20751551.1A Withdrawn EP4010515A1 (de) | 2019-08-05 | 2020-08-05 | Verfahren und anlage zum elektrolytischen beschichten eines elektrisch leitfähigen bandes und/oder gewebes mittels pulstechnik |
| EP20751549.5A Pending EP4010518A1 (de) | 2019-08-05 | 2020-08-05 | Verfahren und anlage zum elektrolytischen beschichten eines elektrisch leitfähigen bandes und/oder gewebes mittels pulstechnik |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US20220275530A1 (de) |
| EP (4) | EP4010516A1 (de) |
| CN (4) | CN114174559A (de) |
| WO (4) | WO2021023783A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4010516A1 (de) * | 2019-08-05 | 2022-06-15 | SMS Group GmbH | Verfahren und anlage zum elektrolytischen beschichten eines elektrisch leitfähigen bandes und/oder gewebes mittels pulstechnik |
| US20220307151A1 (en) * | 2021-03-29 | 2022-09-29 | Suat Sen | Control of texture and morphology of zinc films through pulsed methods from additive-free electrolytes |
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| WO2003038158A2 (de) * | 2001-10-25 | 2003-05-08 | Infineon Technologies Ag | Galvanisiereinrichtung und galvanisiersystem zum beschichten von bereits leitfähig ausgebildeten strukturen |
| DE10357174B3 (de) * | 2003-12-06 | 2005-02-03 | Vipem Hackert Gmbh | Verfahren zur kontinuierlichen Erzeugung von Haftbelägen |
| DE102005005095A1 (de) * | 2005-02-04 | 2006-08-10 | Höllmüller Maschinenbau GmbH | Verfahren und Vorrichtung zur elektrochemischen Behandlung von Bauteilen in Durchlaufanlagen |
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| DE102007055338B4 (de) * | 2007-11-19 | 2009-08-13 | Rena Sondermaschinen Gmbh | Vorrichtung und Verfahren zum elektrischen Kontaktieren von Gut in elektrolytischen Durchlaufanlagen |
| DE102009013164A1 (de) * | 2009-03-07 | 2010-09-09 | Hübel, Egon, Dipl.-Ing. (FH) | Verfahren und Vorrichtung zum elektrolytischen Behandeln von ausgedehntem Gut |
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| DE102013010025A1 (de) * | 2013-06-17 | 2014-12-18 | Muhr Und Bender Kg | Verfahren zum Herstellen eines Erzeugnisses aus flexibel gewalztem Bandmaterial |
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| EP4010516A1 (de) * | 2019-08-05 | 2022-06-15 | SMS Group GmbH | Verfahren und anlage zum elektrolytischen beschichten eines elektrisch leitfähigen bandes und/oder gewebes mittels pulstechnik |
-
2020
- 2020-08-05 EP EP20751554.5A patent/EP4010516A1/de not_active Withdrawn
- 2020-08-05 CN CN202080055430.7A patent/CN114174559A/zh active Pending
- 2020-08-05 WO PCT/EP2020/072032 patent/WO2021023783A1/de not_active Ceased
- 2020-08-05 WO PCT/EP2020/072045 patent/WO2021023789A1/de not_active Ceased
- 2020-08-05 WO PCT/EP2020/072021 patent/WO2021023779A1/de not_active Ceased
- 2020-08-05 US US17/633,018 patent/US20220275530A1/en not_active Abandoned
- 2020-08-05 CN CN202080054435.8A patent/CN114174560A/zh active Pending
- 2020-08-05 CN CN202080054721.4A patent/CN114207191A/zh active Pending
- 2020-08-05 EP EP20768503.3A patent/EP4010517A1/de not_active Withdrawn
- 2020-08-05 EP EP20751551.1A patent/EP4010515A1/de not_active Withdrawn
- 2020-08-05 WO PCT/EP2020/072020 patent/WO2021023778A1/de not_active Ceased
- 2020-08-05 EP EP20751549.5A patent/EP4010518A1/de active Pending
- 2020-08-05 CN CN202080054400.4A patent/CN114207190A/zh active Pending
-
2024
- 2024-03-22 US US18/614,203 patent/US20240229276A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021023783A1 (de) | 2021-02-11 |
| EP4010515A1 (de) | 2022-06-15 |
| CN114174560A (zh) | 2022-03-11 |
| CN114174559A (zh) | 2022-03-11 |
| WO2021023778A1 (de) | 2021-02-11 |
| EP4010518A1 (de) | 2022-06-15 |
| WO2021023779A1 (de) | 2021-02-11 |
| EP4010517A1 (de) | 2022-06-15 |
| CN114207191A (zh) | 2022-03-18 |
| CN114207190A (zh) | 2022-03-18 |
| US20240229276A1 (en) | 2024-07-11 |
| US20220275530A1 (en) | 2022-09-01 |
| WO2021023789A1 (de) | 2021-02-11 |
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