EP0838542B1 - Process and device for electrolytic pickling of metal strips - Google Patents
Process and device for electrolytic pickling of metal strips Download PDFInfo
- Publication number
- EP0838542B1 EP0838542B1 EP97117775A EP97117775A EP0838542B1 EP 0838542 B1 EP0838542 B1 EP 0838542B1 EP 97117775 A EP97117775 A EP 97117775A EP 97117775 A EP97117775 A EP 97117775A EP 0838542 B1 EP0838542 B1 EP 0838542B1
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- Prior art keywords
- strip
- electrodes
- electrolyte
- process according
- anodes
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
- C25F1/06—Iron or steel
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
- C25F1/08—Refractory metals
Definitions
- the invention relates to a method and an apparatus for electrolytic pickling of metallic strips, in particular Stainless steel bands, bands made of titanium, aluminum or nickel, the Electric current indirectly, i.e. without electrically conductive contact between tape and electrodes, is passed through the tape, the Band vertically and the electrolyte liquid between the band and the electrodes are inserted.
- GB 2140036 further describes a device for electrochemical treatment of metal strips with vertical Belt guide, indirect power supply and by gravity forced electrolyte flow in the gap between the band and the electrodes.
- the Srom has to travel long distances in the band, taking the danger there is that it is derived at the deflection rollers and in others Episode is not available for the pickling process.
- the invention is characterized in that the anode and cathode on Band are connected in direct succession. This is the way of Current through the tape is very short and the losses are low. Consequently much higher current rates can also be transmitted.
- An advantageous development of the invention is characterized in that that the distance between the anodes and cathodes depending on the Band dimension is changeable. It is achieved that at different Band dimensions the maximum current yield at the lowest Tension can be achieved. Are the anode and cathode too close to each other? arranged, there is a direct current flow. On the other hand, it increases with their distance the voltage drop in the band. Naturally depends this voltage drop together with the band cross section. There are therefore an optimal distance for each band dimension.
- a favorable embodiment of the invention is characterized in that that the amount of electrolyte in the gap, between the electrodes and the volume, regulated. This allows the belt to be hydraulically accurate be stabilized in the middle between the electrodes. So the distance between electrodes and band can be reduced to a minimum.
- An advantageous variant of the invention is characterized in that the temperature, electrolyte concentration and charge density (Coulomb per unit area) can be specifically adjusted to the strip to be pickled. As a result, the pickling conditions can be applied to every strip dimension, line speed, Treatment time, type of scale etc. optimally set become.
- An advantageous embodiment of the invention is characterized in that that the gap between the electrodes and the band is changed. So the distance can be easily adapted to the band ripple.
- a favorable further development of the invention is characterized in that that the band ripple is determined and the electrodes are removed from the band be avoided so that contact between the tape and the electrode becomes. This prevents contact between the band and the electrodes that would lead to short circuits.
- the invention also relates to a device for electrolytic pickling made of metallic strips, in particular stainless steel strips Titanium, aluminum or nickel, the electrical current being indirect, i.e. without electrically conductive contact between the band and the electrodes the tape is guided, the tape being vertical and between Electrodes and tape a vertical gap is provided in the Electrolyte liquid is introduced. It is characterized in that Anode and cathode are arranged one behind the other on the strip. As a result, the path of the current through the belt is very short, and so is that Losses low. This means that significantly higher current rates can also be used be transmitted.
- a favorable further development of the invention is characterized in that that anodes and cathodes are staggered in the direction of the tape are, i.e. the tape runs between two opposite Anodes or two opposite cathodes. This results in a uniform current flow and at the band edge thus an even pickling effect.
- an advantageous embodiment of the invention is characterized in that the anode surface, or the anodes entirely, are preferably made of lead, or lead alloys, or iridium oxide or graphite.
- the material from which the anodes are made results in a chemical passivation against the anodic attack of the electrolyte anions.
- Lead with sulfate ions (SO 4 2- ) and iridium oxide with sulfate and / or chloride ions (Cl - ) are preferably used.
- Graphite with various anions or mixtures thereof can also be used.
- An advantageous variant of the invention is characterized in that a control device for the amount of electrolyte is provided is, with one per liquid channel between the band and the electrode separate control device can be provided. This can on the one hand the flow is adapted to the bandwidth and also for Bands of different widths can be optimally adjusted. Through the Resulting hydraulic guidance of the belt can change the position of the Band can be set between the electrodes.
- the conventional ones Systems usually require two rectifiers per cell - one for the underside of the band and one for the top of the band.
- the cell according to the invention can be a rectifier for one or for multiple cells can be installed. Thanks to the hydraulic belt guide, which is made possible by regulating the amount of electrolyte added now e.g. the top of the tape, if more scaled, closer to the Electrodes are pressed and thus stained more intensely.
- a favorable embodiment of the invention is characterized in that that a device for adjusting or controlling the distance is provided between anodes and cathodes.
- the adjustable distance between the anode and cathode allows the current flow to be adjusted and subsequently a reduction in electricity costs.
- An advantageous development of the invention is characterized in that that a device for adjusting the gap between the tape and Electrode is provided. So the distance can easily match the band ripple be adjusted.
- a cheap variant of the invention is characterized in that a device for detecting the band ripple is provided, which with the adjusting device of the electrodes is connected. This will Avoid contact between the tape and electrodes, which leads to short circuits could lead.
- the rectifier current was increased at a constant system speed of approx. 50 m / min. With a current of 6000A (4x1500 A) the belt was completely free of scale. With a current application of 8000 A there was an improved gloss of the strip surface. Here, with a current density of approx. 200 A / dm 2 , there were no problems in the cell with electrolyte overheating, excessive local heating of the strip or insufficient gas discharge. The evaluation of the tests also consisted of determining the uniformity of the current application. This was done through the gloss and color measurements. It was found that the fluctuations were not larger than that of the starting material. The particularly scaled band edges were completely descaled.
- 1 shows the diagram of a conventional pickling plant with neutral electrolyte
- 2 shows a plant according to the inventive method
- Figure 3 illustrates a cell according to the invention.
- Fig. 1 shows a pickling tank 1 according to the prior art.
- the metal strip 2 is passed through the electrolyte 3, for example Na 2 SO 4 , between the cathodes 4 and anodes 5.
- the distance between the electrodes and the band is usually approximately 70 to 150 mm, the band 2 having a certain sag, which can be reduced by support rollers, for example in the middle of the system.
- the electrolyte 3 is fed from a pump 7 via a line 6 into the pickling tank 1 and, via a line 8, for example into an intermediate tank 9, from where the electrolyte 3 is recirculated.
- Fig. 2 shows a system with a decoiler 11 and a decoiler 18, the it enables the belt to travel at a speed of up to 60 m / min to pull through the treatment.
- the treatment consists of chemical degreasing 12 to clean the oiled tape and an electrolytic cell 13.
- the cell is connected to 4 rectifiers. Each of them has an output of max. 3000A / 32 V.
- the arrangement of the electrodes 15, 16 was chosen so that only an anode (15) - cathode (16) pair is connected to a rectifier.
- the belt 2 is deflected here via rollers 14, 14 '.
- Fig. 3 shows an electrolytic cell according to the invention.
- the metallic Volume 2 e.g. B. stainless steel strip, is in the gap between the electrodes 15, 16 out.
- the electrodes, e.g. the cathode 16 can in Direction 20 are moved so that the distance between anode 15 and Cathode 16 is adjustable. This enables optimal use of electricity.
- the electrolyte is in turn pump 7 via a line 6, wherein lines 21, 21 ', 21 ", 21"' are provided which connect the electrolyte 3 into the columns 24, 24 ', 24 ", 24"' between the electrodes 15, 16 and the Feed in volume 2.
- the electrolyte can now be controlled by regulators 22, 22 ', 22 ", 22"' to be adapted to the required conditions. After passage between the electrodes, the electrolyte 3 is in the lower Part 23 of the electrolytic cell 13 collected and again the Pump 7 supplied.
- the new cell has higher performance than the conventional ones. At same electrical power can be achieved by the lower voltage drop more electricity is passed through the belt. At the same time, however new cell flow mechanically designed so that very high Mass transfer numbers and heat transfer values can be achieved. This results from high turbulence due to the small gap between the electrodes and the band as well as by the band movement i.e. it dissolves the metals and the heat from the Reaction zone removed very effectively.
- the main advantage of cell according to the invention compared to the flooded cell according to the prior art the technology (see Fig. 1) lies in the better tape guidance and higher mass and heat exchange. This results in a higher one Pickling performance.
- the conventional cells have rectifier performance from 11000 A (2 x 5500). Depending on the distance between electrodes and Band (approx. 50 - 150 mm) the voltage drop is between 25 and 40 V.
- the cell according to the invention can apply 50,000 A to the band at approximately 17 V. transfer.
- the invention is not limited by the embodiments shown. Rather, all known variants of the circuit and Arrangement of the electrodes, e.g. corresponding polarization or shorter anodes and longer cathodes to increase chemical Treatment, can be used analogously.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Electroplating Methods And Accessories (AREA)
- Electrolytic Production Of Metals (AREA)
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum elektrolytischen Beizen von metallischen Bändern, insbesondere Edelstahlbändern, Bänder aus Titan, Aluminium oder Nickel, wobei der elektrische Strom indirekt, d.h. ohne elektrisch leitende Berührung zwischen Band und Elektroden, durch das Band geleitet wird, wobei das Band vertikal geführt und die Elektrolytflüssigkeit zwischen das Band und die Elektroden eingebracht wird.The invention relates to a method and an apparatus for electrolytic pickling of metallic strips, in particular Stainless steel bands, bands made of titanium, aluminum or nickel, the Electric current indirectly, i.e. without electrically conductive contact between tape and electrodes, is passed through the tape, the Band vertically and the electrolyte liquid between the band and the electrodes are inserted.
Beim Beizen von kaltgewalzten Edelstahlbändern wird üblicherweise das sogenannte "Neutralelektrolyt" Verfahren eingesetzt. Hierbei wird die Spannung indirekt auf das Band geprägt. Das bedeutet, daß es keine Berührungsstellen zwischen etwaigen Stromrollen und Band gibt. Ein weiteres Merkmal dieses Verfahrens ist, daß die Anoden und Kathoden vollständig mit Elektrolyt bedeckt und horizontal angeordnet sind, d.h. es handelt sich um horizontale geflutete Zellen. Ferner ist aus der AT-PS 373 922 ein Verfahren zum elektrolytischen Galvanisieren von Band bekannt. Hier handelt es sich um eine vertikale Anordnung der Elektroden. Die Elektrolytflüssigkeit wird in den Spalt zwischen den Anoden und Band geleitet. Die Spannung wird direkt auf das Band geprägt - die Kathoden sind als Stromrollen ausgeführt.This is usually the case when pickling cold-rolled stainless steel strips so-called "neutral electrolyte" process used. Here, the Tension indirectly shaped on the tape. That means there is none Contact points between any current rollers and tape there. On Another feature of this process is that the anodes and cathodes completely covered with electrolyte and arranged horizontally, i.e. it are horizontal flooded cells. Furthermore, from AT-PS 373 922 discloses a method for electrolytically electroplating strip. This is a vertical arrangement of the electrodes. The Electrolyte liquid is in the gap between the anodes and tape headed. The tension is stamped directly on the tape - the cathodes are designed as current rollers.
Außerdem ist aus dem Patent US 4363709 das Beizen von Edelstahlband mit höheren Stromdichten bekannt. Erwähnt werden Stromdichten von 40-60 A/dm2 ohne jedoch auf die Apparatur einzugehen mit welcher diese in einer großtechnischen Anlage, in einem vernünftigen Spannungsbereich (= unter 40 Volt) verwirklicht werden können.In addition, pickling of stainless steel strip with higher current densities is known from US Pat. No. 4,363,709. Current densities of 40-60 A / dm 2 are mentioned, but without going into the equipment with which they can be implemented in a large-scale plant, in a reasonable voltage range (= below 40 volts).
Die GB 2140036 beschreibt weiters eine Vorrichtung zum elektrochemischen Behandeln von Metallbändern mit vertikaler Bandführung, indirekter Stromzuführung und durch die Schwerkraft erzwungener Elektrolytströmung im Spalt zwischen Band und Elektroden. Hier muß der Srom im Band lange Wege zurücklegen, wobei die Gefahr besteht, daß er an den Umlenkwalzen abgeleitet wird und in weiterer Folge nicht für den Beizprozeß zur Verfügung steht. GB 2140036 further describes a device for electrochemical treatment of metal strips with vertical Belt guide, indirect power supply and by gravity forced electrolyte flow in the gap between the band and the electrodes. Here the Srom has to travel long distances in the band, taking the danger there is that it is derived at the deflection rollers and in others Episode is not available for the pickling process.
Die Erfindung ist dadurch gekennzeichnet, daß Anode und Kathode am Band direkt hintereinander geschaltet sind. Dadurch ist der Weg des Stromes durch das Band sehr kurz und auch die Verluste gering. Somit können auch wesentlich höhere Stromraten übertragen werden.The invention is characterized in that the anode and cathode on Band are connected in direct succession. This is the way of Current through the tape is very short and the losses are low. Consequently much higher current rates can also be transmitted.
Eine vorteilhafte Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß der Abstand zwischen Anoden und Kathoden in Abhängigkeit von der Banddimension veränderbar ist. Hierbei wird erreicht, daß bei verschiedenen Banddimensionen die maximale Stromausbeute bei niedrigster Spannung erreicht werden kann. Sind Anode und Kathode zu nah aneinander angeordnet, ergibt sich ein direkter Stromfluß. Andererseits steigt mit ihrem Abstand der Spannungsabfall im Band. Naturgemäß hängt dieser Spannungsabfall mit dem Bandquerschnitt zusammen. Es gibt demnach für jede Banddimension einen optimalen Abstand.An advantageous development of the invention is characterized in that that the distance between the anodes and cathodes depending on the Band dimension is changeable. It is achieved that at different Band dimensions the maximum current yield at the lowest Tension can be achieved. Are the anode and cathode too close to each other? arranged, there is a direct current flow. On the other hand, it increases with their distance the voltage drop in the band. Naturally depends this voltage drop together with the band cross section. There are therefore an optimal distance for each band dimension.
Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß die Elektrolytaufgabemenge im Spalt, zwischen den Elektroden und dem Band, geregelt erfolgt. Dadurch kann das Band hydraulisch genau mittig zwischen den Elektroden stabilisiert werden. So kann der Abstand zwischen Elektroden und Band auf ein Minimum reduziert werden.A favorable embodiment of the invention is characterized in that that the amount of electrolyte in the gap, between the electrodes and the volume, regulated. This allows the belt to be hydraulically accurate be stabilized in the middle between the electrodes. So the distance between electrodes and band can be reduced to a minimum.
Eine vorteilhafte Variante der Erfindung ist dadurch gekennzeichnet, daß die Temperatur, Elektrolytkonzentration und die Ladungsdichte (Coulomb per Flächeneinheit) gezielt auf das zu beizende Band eingestellt werden. Dadurch können die Beizbedingungen auf jede Banddimension, Anlagengeschwindigkeit, Behandlungszeit, Zunderart etc. optimal eingestellt werden.An advantageous variant of the invention is characterized in that the temperature, electrolyte concentration and charge density (Coulomb per unit area) can be specifically adjusted to the strip to be pickled. As a result, the pickling conditions can be applied to every strip dimension, line speed, Treatment time, type of scale etc. optimally set become.
Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß der Spalt zwischen den Elektroden und dem Band verändert wird. So kann der Abstand einfach an die Bandwelligkeit angepaßt werden.An advantageous embodiment of the invention is characterized in that that the gap between the electrodes and the band is changed. So the distance can be easily adapted to the band ripple.
Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß die Bandwelligkeit ermittelt und die Elektroden vom Band entfernt werden, so daß eine Berührung, zwischen Band und Elektrode vermieden wird. Dadurch können Berührungen zwischen Band und Elektroden vermieden werden, die zu Kurzschlüssen führen würden.A favorable further development of the invention is characterized in that that the band ripple is determined and the electrodes are removed from the band be avoided so that contact between the tape and the electrode becomes. This prevents contact between the band and the electrodes that would lead to short circuits.
Die Erfindung betrifft auch eine Vorrichtung zum elektrolytischen Beizen von metallischen Bändern, insbesondere Edelstahlbändern, Bänder aus Titan, Aluminium oder Nickel, wobei der elektrische Strom indirekt, d.h. ohne elektrisch leitende Berührung zwischen Band und Elektroden, durch das Band geleitet wird, wobei das Band vertikal verläuft und zwischen Elektroden und Band ein vertikaler Spalt vorgesehen ist, in den Elektrolytflüssigkeit eingebracht wird. Sie ist dadurch gekennzeichnet, daß Anode und Kathode am Band direkt hintereinander angeordnet sind. Dadurch ist der Weg des Stromes durch das Band sehr kurz und auch die Verluste gering. Somit können auch wesentlich höhere Stromraten übertragen werden.The invention also relates to a device for electrolytic pickling made of metallic strips, in particular stainless steel strips Titanium, aluminum or nickel, the electrical current being indirect, i.e. without electrically conductive contact between the band and the electrodes the tape is guided, the tape being vertical and between Electrodes and tape a vertical gap is provided in the Electrolyte liquid is introduced. It is characterized in that Anode and cathode are arranged one behind the other on the strip. As a result, the path of the current through the belt is very short, and so is that Losses low. This means that significantly higher current rates can also be used be transmitted.
Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß Anoden und Kathoden zueinander versetzt in Bandrichtung angeordnet sind, d.h. das Band läuft jeweils zwischen zwei gegenüberliegenden Anoden bzw. zwei gegenüberliegenden Kathoden hindurch. Dadurch ergibt sich auch am Bandrand ein gleichmäßiger Stromfluß und somit eine gleichmäßige Beizwirkung.A favorable further development of the invention is characterized in that that anodes and cathodes are staggered in the direction of the tape are, i.e. the tape runs between two opposite Anodes or two opposite cathodes. This results in a uniform current flow and at the band edge thus an even pickling effect.
Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß die Anodenoberfläche, oder die Anoden zur Gänze, bevorzugt aus Blei, oder Bleilegierungen, oder Iridiumoxid oder aus Graphit hergestellt sind. Das Material aus dem die Anoden hergestellt sind ergibt eine chemische Passivierung gegenüber dem anodischen Angriff der Elektrolytanionen. Vorzugsweise wird Blei mit Sulfationen (SO4 2-) und Iridiumoxyd mit Sulfat- und/oder Chloridionen (Cl-) eingesetzt. Ferner kann auch Graphit mit verschiedenen Anionen oder deren Mischungen eingesetzt werden.An advantageous embodiment of the invention is characterized in that the anode surface, or the anodes entirely, are preferably made of lead, or lead alloys, or iridium oxide or graphite. The material from which the anodes are made results in a chemical passivation against the anodic attack of the electrolyte anions. Lead with sulfate ions (SO 4 2- ) and iridium oxide with sulfate and / or chloride ions (Cl - ) are preferably used. Graphite with various anions or mixtures thereof can also be used.
Eine vorteilhafte Variante der Erfindung ist dadurch gekennzeichnet, daß eine Regelungseinrichtung für die Elektrolytaufgabemenge vorgesehen ist, wobei pro Flüssigkeitskanal zwischen Band und Elektrode eine separate Regelungseinrichtung vorgesehen sein kann. Dadurch kann einerseits die Strömung an die Bandbreite angepaßt und auch für Bändern unterschiedlicher Breite optimal eingestellt werden. Durch die sich ergebende hydraulische Führung des Bandes kann die Position des Bandes gezielt zwischen den Elektroden eingestellt werden. Die herkömmlichen Anlagen benötigen üblicherweise zwei Gleichrichter pro Zelle - einen für die Bandunterseite und einen für die Bandoberseite. Bei der erfindungsgemäßen Zelle kann ein Gleichrichter für eine oder auch für mehrere Zellen installiert werden. Durch die hydraulische Bandführung, die durch die Regelung der Elektrolytaufgabemenge ermöglicht wird, kann nun z.B. die Bandoberseite, wenn sie stärker verzundert ist, näher an die Elektroden gedrückt und dadurch intensiver gebeizt werden.An advantageous variant of the invention is characterized in that a control device for the amount of electrolyte is provided is, with one per liquid channel between the band and the electrode separate control device can be provided. This can on the one hand the flow is adapted to the bandwidth and also for Bands of different widths can be optimally adjusted. Through the Resulting hydraulic guidance of the belt can change the position of the Band can be set between the electrodes. The conventional ones Systems usually require two rectifiers per cell - one for the underside of the band and one for the top of the band. In the cell according to the invention can be a rectifier for one or for multiple cells can be installed. Thanks to the hydraulic belt guide, which is made possible by regulating the amount of electrolyte added now e.g. the top of the tape, if more scaled, closer to the Electrodes are pressed and thus stained more intensely.
Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß eine Einrichtung zur Einstellung bzw. Regelung des Abstandes zwischen Anoden und Kathoden vorgesehen ist. Der verstellbare Abstand zwischen Anode und Kathode ermöglicht eine Anpassung des Stromflusses und in weiterer Folge eine Senkung der Stromkosten.A favorable embodiment of the invention is characterized in that that a device for adjusting or controlling the distance is provided between anodes and cathodes. The adjustable distance between the anode and cathode allows the current flow to be adjusted and subsequently a reduction in electricity costs.
Eine vorteilhafte Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß eine Einrichtung zur Einstellung des Spaltes zwischen Band und Elektrode vorgesehen ist. So kann der Abstand leicht an die Bandwelligkeit angepaßt werden.An advantageous development of the invention is characterized in that that a device for adjusting the gap between the tape and Electrode is provided. So the distance can easily match the band ripple be adjusted.
Eine günstige Variante der Erfindung ist dadurch gekennzeichnet, daß eine Einrichtung zur Erkennung der Bandwelligkeit vorgesehen ist, die mit der Einstelleinrichtung der Elektroden verbunden ist. Dadurch werden Berührungen zwischen Band und Elektroden vermieden, die zu Kurzschlüssen führen könnten. A cheap variant of the invention is characterized in that a device for detecting the band ripple is provided, which with the adjusting device of the electrodes is connected. This will Avoid contact between the tape and electrodes, which leads to short circuits could lead.
Um das Verfahren zu erproben wurde eine Versuchsanlage gebaut. Die
Anordnung besteht aus einer a) Abhaspel und b) Aufhaspel die es
ermöglichen das Band mit einer Geschwindigkeit bis zu 60 m/min durch
die Behandlung durchzuziehen. Die Behandlung besteht aus einer c)
chemischen Entfettung, um das eingeölte Band reinigen zu können, und
d) einer Elektrolytischen Zelle. Die Zelle ist verbunden mit e) 4
Gleichrichtern. Jeder von ihnen hat eine Leistung von max. 3000 A/32 V.
Die Anordnung der Elektroden wurde so gewählt, daß jeweils nur ein
f) Anoden-/ g) Kathodenpaar mit einem Gleichrichter verbunden ist. Die
Elektrodenabstände wurden manuell eingestellt.
Mit dieser Anordnung wurde ein Bund von geglühtem Edelstahlkaltband
behandelt.
With this arrangement, a bundle of annealed stainless steel cold strip was treated.
Es wurde bei konstanter Anlagengeschwindigkeit von ca. 50 m/min der Gleichrichterstrom gesteigert. Bei einer Stromaufgabe von 6000A (4x1500 A) war das Band vollkommen zunderfrei. Bei einer Stromaufgabe von 8000 A ergab sich ein verbesserter Glanz der Bandoberfläche. Hierbei, bei einer Stromdichte von ca. 200 A/dm2, gab es in der Zelle keine Probleme mit Elektrolytüberhitzung, zu hoher örtlichen Erhitzung des Bandes oder nur ungenügender Gasabführung. Die Auswertung der Versuche bestand auch darin die Gleichmäßigkeit der Stromaufgabe zu bestimmen. Dies wurde durch die Glanz- und Farbmessungen gemacht. Es wurde festgestellt, daß die Schwankungen nicht größer waren als beim Ausgangsmaterial. Es wurden auch die besonders verzunderten Bandränder vollständig entzundert.The rectifier current was increased at a constant system speed of approx. 50 m / min. With a current of 6000A (4x1500 A) the belt was completely free of scale. With a current application of 8000 A there was an improved gloss of the strip surface. Here, with a current density of approx. 200 A / dm 2 , there were no problems in the cell with electrolyte overheating, excessive local heating of the strip or insufficient gas discharge. The evaluation of the tests also consisted of determining the uniformity of the current application. This was done through the gloss and color measurements. It was found that the fluctuations were not larger than that of the starting material. The particularly scaled band edges were completely descaled.
Die Erfindung wird nun anhand der Zeichnungen beispielhaft erläutert, wobei Fig. 1 das Schema einer herkömmlichen Beizanlage mit Neutralelektrolyt, Fig. 2 eine Anlage nach dem erfindungsgemäßen Verfahren, Fig. 3 eine Zelle nach der Erfindung darstellt.The invention will now be explained by way of example with reference to the drawings, 1 shows the diagram of a conventional pickling plant with neutral electrolyte, 2 shows a plant according to the inventive method, Figure 3 illustrates a cell according to the invention.
Fig. 1 zeigt einen Beizbehälter 1 nach dem Stand der Technik. Das
Metallband 2 wird durch den Elektrolyt 3, beispielsweise Na2SO4,
zwischen den Kathoden 4 und Anoden 5 hindurchgeführt. Der Abstand
zwischen Elektroden und Band beträgt üblicherweise ca. 70 bis 150 mm,
wobei das Band 2 einen gewissen Durchhang aufweist, der durch Stützwalzen,
z.B. in Anlagenmitte, verringert werden kann. Der Elektrolyt 3 wird
von einer Pumpe 7 über eine Leitung 6 in den Beizbehälter 1 geleitet und
über eine Leitung 8 beispielsweise in einen Zwischenbehälter 9 abgeleitet,
von wo der Elektrolyt 3 wieder rezirkuliert wird.Fig. 1 shows a
Fig. 2 zeigt eine Anlage mit einer Abhaspel 11 und einer Aufhaspel 18, die
es ermöglichen das Band mit einer Geschwindigkeit bis zu 60 m/min
durch die Behandlung hindurchzuziehen. Die Behandlung besteht aus
einer chemischen Entfettung 12, um das eingeölte Band reinigen zu
können, und einer elektrolytischen Zelle 13. Die Zelle ist verbunden mit
4 Gleichrichtern. Jeder von ihnen hat eine Leistung von max. 3000A/32 V.
Die Anordnung der Elektroden 15, 16 wurde so gewählt, daß jeweils nur
ein Anoden(15) - Kathoden(16)paar mit einem Gleichrichter verbunden ist.
Das Band 2 wird hier über Walzen 14, 14' umgelenkt. Fig. 2 shows a system with a
Fig. 3 zeigt eine elektrolytische Zelle nach der Erfindung. Das metallische
Band 2, z. B. Edelstahlband, wird in den Spalt zwischen den Elektroden
15, 16 geführt. Jeweils ein Anoden(15) - Kathoden(16)paar ist mit einem
Gleichrichter 19 verbunden. Die Elektroden, z.B. die Kathode 16, kann in
Richtung 20 bewegt werden, so daß der Abstand zwischen Anode 15 und
Kathode 16 einstellbar ist. Dies ermöglicht eine optimale Stromnutzung.
Die Elektrolytaufgabe erfolgt wiederum mittels Pumpe 7 über eine Leitung
6, wobei Leitungen 21, 21', 21", 21"' vorgesehen sind, die den Elektrolyt 3
in die Spalte 24, 24', 24", 24"' zwischen den Elektroden 15, 16 und dem
Band 2 einspeisen. Die Elektrolytaufgabe kann nun durch Regelorgane
22, 22', 22", 22"' an die erforderlichen Bedingungen angepaßt werden.
Nach Durchgang zwischen den Elektroden wird der Elektrolyt 3 im unteren
Teil 23 der elektrolytischen Zelle 13 gesammelt und wiederum der
Pumpe 7 zugeführt.Fig. 3 shows an electrolytic cell according to the invention. The
Die neue Zelle weist höhere Leistung auf als die herkömmlichen. Bei gleicher elektrischer Leistung kann durch den geringeren Spannungsabfall mehr Strom durch das Band geleitet werden. Gleichzeitig jedoch ist die neue Zelle strömungsmechanisch so konzipiert, daß sehr hohe Stoffaustauschzahlen sowie Wärmeübergangswerte erreicht werden. Dies ergibt sich durch eine hohe Turbulenz bedingt durch den kleinen Spalt zwischen den Elektroden und dem Band sowie durch die Bandbewegung d.h. es werden die gelösten Metalle sowie die Wärme aus der Reaktionszone sehr effektiv abtransportiert. Der wesentliche Vorteil der erfindungsgemäßen Zelle gegenüber der gefluteten Zelle nach dem Stand der Technik (siehe Fig. 1) liegt in der besseren Bandführung und dem höheren Stoff- und Wärmeaustausch. Dadurch ergibt sich eine höhere Beizleistung. Die herkömmlichen Zellen weisen eine Gleichrichterleistung von 11000 A (2 x 5500) auf. Je nach Abstand zwischen Elektroden und Band (ca. 50 - 150 mm) liegt der Spannungsabfall zwischen 25 und 40 V. The new cell has higher performance than the conventional ones. At same electrical power can be achieved by the lower voltage drop more electricity is passed through the belt. At the same time, however new cell flow mechanically designed so that very high Mass transfer numbers and heat transfer values can be achieved. This results from high turbulence due to the small gap between the electrodes and the band as well as by the band movement i.e. it dissolves the metals and the heat from the Reaction zone removed very effectively. The main advantage of cell according to the invention compared to the flooded cell according to the prior art the technology (see Fig. 1) lies in the better tape guidance and higher mass and heat exchange. This results in a higher one Pickling performance. The conventional cells have rectifier performance from 11000 A (2 x 5500). Depending on the distance between electrodes and Band (approx. 50 - 150 mm) the voltage drop is between 25 and 40 V.
Die erfindungsgemäße Zelle kann 50000 A bei ca. 17 V auf das Band übertragen.The cell according to the invention can apply 50,000 A to the band at approximately 17 V. transfer.
Die Erfindung ist nicht durch die dargestellten Ausführungen beschränkt. Vielmehr können auch alle bekannten Varianten der Schaltung und Anordnung der Elektroden, wie z.B. entsprechende Polarisierung oder kürzere Anoden und längere Kathoden zur Steigerung der chemischen Behandlung, analog eingesetzt werden.The invention is not limited by the embodiments shown. Rather, all known variants of the circuit and Arrangement of the electrodes, e.g. corresponding polarization or shorter anodes and longer cathodes to increase chemical Treatment, can be used analogously.
Claims (20)
- Process for electrolytic pickling of metallic strip, particularly stainless steel strip and strip made of titanium, aluminium or nickel, where the electric current is conducted through the strip indirectly, i.e. without electrically conductive contact between the strip and the electrodes, with the strip running vertically and the electrolyte liquid being fed in between the strip and the electrodes, characterized by the anode and the cathode being directly tandem-switched on the strip.
- Process according to Claim 1, characterized by the spacing between the anodes and cathodes being changeable to suit the strip dimension.
- Process according to Claim 1 or 2, characterized by the amount of electrolyte being fed into the gap between the electrodes and the strip being controlled.
- Process according to one of the Claims 1 to 3, characterized by the temperature being set specifically to suit the strip to be pickled.
- Process according to Claim 4, characterized by the temperature of the electrolyte being set between 20 and 85°C, preferably below 70°C.
- Process according to one of the Claims 1 to 5, characterized by the concentration of the electrolyte being set specifically to suit the strip to be pickled.
- Process according to Claim 6, characterized by the concentration of Na2SO4 in the electrolyte amounting to between 100 and 350 g/l, preferably around 150 g/l.
- Process according to one of the Claims 1 to 7, characterized by the loading density (Coulomb per unit of area) being set specifically to suit the strip to be pickled.
- Process according to one of the Claims 1 to 8, characterized by the current densities amounting to between 20 A/dm2 and 250 A/dm2, with, for example, approximately 130 A/dm2 for lead anodes and approximately 180 A/dm2 for iridium anodes.
- Process according to one of the Claims 1 to 9, characterized by the gap between the electrodes and the strip being altered.
- Process according to Claim 10, characterized by the strip waviness being measured and the electrodes moved away from the strip in order to avoid any contact between the strip and the electrode.
- Device for electrolytic pickling of metallic strip, particularly stainless steel strip and strip made of titanium, aluminium or nickel, where the electric current is conducted through the strip indirectly, i.e. without electrically conductive contact between the strip and the electrodes, with the strip running vertically and a vertical gap being provided between the electrodes and the strip into which the electrolyte liquid is fed, characterized by the anode and the cathode being directly tandem-switched on the strip.
- Device according to Claim 12, characterized by the anodes and cathodes being located in an offset arrangement to one another.
- Device according to Claim 12 or 13, characterized by the surface of the anodes or the entire anodes being made preferably of lead or lead alloys, or of iridium oxide or graphite.
- Device according to one of the Claims 12 to 14, characterized by a control device being provided for the electrolyte feed flow rate.
- Device according to Claim 15, characterized by a separate control device being provided for each liquid channel between the strip and the electrode.
- Device according to one of the Claims 12 to 16, characterized by a device being provided to set and control the spacing between the anodes and the cathodes.
- Device according to Claims 12 to 17, characterized by a device being provided to set the gap between the strip and the electrode.
- Device according to Claim 18, characterized by a device which is connected to the setting device for the electrodes being provided to detect strip waviness.
- Device according to one of the Claims 12 to 19, characterized by the electrodes and the strip being spaced at a distance between 5 and 15 mm from one another.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0187296A AT406385B (en) | 1996-10-25 | 1996-10-25 | METHOD AND DEVICE FOR ELECTROLYTICALLY STICKING METAL STRIPS |
| AT187296 | 1996-10-25 | ||
| AT1872/96 | 1996-10-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0838542A1 EP0838542A1 (en) | 1998-04-29 |
| EP0838542B1 true EP0838542B1 (en) | 2001-06-13 |
Family
ID=3522840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97117775A Expired - Lifetime EP0838542B1 (en) | 1996-10-25 | 1997-10-14 | Process and device for electrolytic pickling of metal strips |
Country Status (14)
| Country | Link |
|---|---|
| US (1) | US6120671A (en) |
| EP (1) | EP0838542B1 (en) |
| KR (1) | KR100487646B1 (en) |
| CN (1) | CN1195905C (en) |
| AT (1) | AT406385B (en) |
| BR (1) | BR9705144A (en) |
| CA (1) | CA2218765A1 (en) |
| DE (1) | DE59703769D1 (en) |
| ES (1) | ES2159076T3 (en) |
| ID (1) | ID18748A (en) |
| MX (1) | MX9708212A (en) |
| MY (1) | MY123861A (en) |
| RU (1) | RU2205254C2 (en) |
| TW (1) | TW531570B (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1302202B1 (en) | 1998-09-11 | 2000-07-31 | Henkel Kgaa | ELECTROLYTIC PICKLING PROCESS WITH SOLUTIONS FREE FROM ACIDONITRICO. |
| DE19951325C2 (en) | 1999-10-20 | 2003-06-26 | Atotech Deutschland Gmbh | Method and device for the electrolytic treatment of electrically insulated, electrically conductive structures on surfaces of electrically insulating film material and applications of the method |
| DE19951324C2 (en) | 1999-10-20 | 2003-07-17 | Atotech Deutschland Gmbh | Method and device for the electrolytic treatment of electrically conductive surfaces of pieces of plate and foil material separated from one another and application of the method |
| DE10153171B4 (en) * | 2001-10-27 | 2004-09-16 | Atotech Deutschland Gmbh | Method and device for the electrolytic treatment of parts in continuous systems |
| AT413697B (en) * | 2001-11-07 | 2006-05-15 | Andritz Ag Maschf | METHOD FOR TREATING ACIDIC WATER |
| AT413707B (en) * | 2004-07-19 | 2006-05-15 | Voest Alpine Ind Anlagen | METHOD AND DEVICE FOR METALING |
| JP4531777B2 (en) * | 2007-01-18 | 2010-08-25 | 日本メクトロン株式会社 | Pre-plating method for printed wiring boards |
| US20130233702A1 (en) * | 2012-03-09 | 2013-09-12 | Chung-Shan Institute of Science and Technology, Armaments, Bureau, Ministry of National Defense | Multi-Stationed Continuous Electro-Polishing System |
| DE102013022030B4 (en) * | 2013-12-19 | 2017-10-05 | Schlenk Metallfolien Gmbh & Co. Kg | Process for the electrolytic surface modification of flat metal workpieces in sulfatometallhaltigen copper sulfate treatment liquids, flat metal workpiece and its use |
| JP6233334B2 (en) | 2015-03-04 | 2017-11-22 | Ｊｆｅスチール株式会社 | Continuous electrolytic etching method for directional electrical steel strip and continuous electrolytic etching apparatus for directional electrical steel strip |
| IT201700097032A1 (en) * | 2017-08-29 | 2019-03-01 | Qualital Servizi Srl | PLANT AND PROCEDURE FOR THE ELECTROCHEMICAL TREATMENT OF METALLIC MATERIAL TAPES |
| CN109750307B (en) * | 2019-03-11 | 2021-04-13 | 中冶东方工程技术有限公司 | Pickling system and method for stainless steel plate |
| CN111621840A (en) * | 2020-05-26 | 2020-09-04 | 大连理工大学 | Bipolar electrochemical removal method for iron pollution on surface of titanium alloy |
| CN111676493B (en) * | 2020-06-12 | 2021-02-19 | 广东嘉元科技股份有限公司 | Multifunctional device for stripping electrolytic copper foil and surface treatment |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US821622A (en) * | 1904-06-29 | 1906-05-29 | Thomas A Edison | Process of cleaning metallic surfaces. |
| US3420760A (en) * | 1965-04-30 | 1969-01-07 | Gen Dynamics Corp | Process for descaling steel strip in an aqueous organic chelating bath using alternating current |
| US3557336A (en) * | 1967-01-13 | 1971-01-19 | British Iron Steel Research | Electrochemical heat treatment |
| US3779877A (en) * | 1972-02-22 | 1973-12-18 | Sprague Electric Co | Electrolytic etching of aluminum foil |
| US3970537A (en) * | 1973-07-11 | 1976-07-20 | Inland Steel Company | Electrolytic treating apparatus |
| US4118302A (en) * | 1977-08-10 | 1978-10-03 | National Steel Corporation | Cathode structure for use in electrolytic process |
| US4363709A (en) * | 1981-02-27 | 1982-12-14 | Allegheny Ludlum Steel Corporation | High current density, acid-free electrolytic descaling process |
| US4526688A (en) * | 1981-10-05 | 1985-07-02 | Industrial Filter & Pump Mfg. Co. | Pressure filter with vibratory impactor |
| US4434040A (en) * | 1982-09-28 | 1984-02-28 | United States Steel Corporation | Vertical-pass electrotreating cell |
| IT1173713B (en) * | 1983-05-16 | 1987-06-24 | Centro Speriment Metallurg | DEVICE FOR ELECTROLYTIC TREATMENT OF METAL TAPES |
| IT1214758B (en) * | 1986-12-18 | 1990-01-18 | Centro Speriment Metallurg | PROCESS FOR THE CONTINUOUS ELECTROLYTIC TREATMENT OF METALS AND DEVICE TO IMPLEMENT IT |
| AT399167B (en) * | 1991-06-10 | 1995-03-27 | Andritz Patentverwaltung | METHOD AND DEVICE FOR ELECTROLYTICALLY STICKING CONTINUOUSLY CONTINUOUS ELECTRICALLY CONDUCTIVE GOODS |
| US5236566A (en) * | 1991-09-24 | 1993-08-17 | Nippon Steel Corporation | Vertical type stream plating apparatus |
-
1996
- 1996-10-25 AT AT0187296A patent/AT406385B/en not_active IP Right Cessation
-
1997
- 1997-10-03 MY MYPI97004649A patent/MY123861A/en unknown
- 1997-10-04 TW TW086114511A patent/TW531570B/en not_active IP Right Cessation
- 1997-10-14 EP EP97117775A patent/EP0838542B1/en not_active Expired - Lifetime
- 1997-10-14 DE DE59703769T patent/DE59703769D1/en not_active Expired - Lifetime
- 1997-10-14 ID IDP973433A patent/ID18748A/en unknown
- 1997-10-14 ES ES97117775T patent/ES2159076T3/en not_active Expired - Lifetime
- 1997-10-20 CA CA002218765A patent/CA2218765A1/en not_active Abandoned
- 1997-10-24 RU RU97117468/02A patent/RU2205254C2/en not_active IP Right Cessation
- 1997-10-24 BR BR9705144A patent/BR9705144A/en active Search and Examination
- 1997-10-24 KR KR1019970054807A patent/KR100487646B1/en not_active IP Right Cessation
- 1997-10-24 US US08/957,155 patent/US6120671A/en not_active Expired - Lifetime
- 1997-10-24 MX MX9708212A patent/MX9708212A/en unknown
- 1997-10-27 CN CNB97121574XA patent/CN1195905C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| MY123861A (en) | 2006-06-30 |
| ES2159076T3 (en) | 2001-09-16 |
| KR100487646B1 (en) | 2005-09-02 |
| ID18748A (en) | 1998-05-07 |
| ATA187296A (en) | 1999-09-15 |
| US6120671A (en) | 2000-09-19 |
| CN1192488A (en) | 1998-09-09 |
| BR9705144A (en) | 1999-02-23 |
| KR19980033150A (en) | 1998-07-25 |
| RU2205254C2 (en) | 2003-05-27 |
| TW531570B (en) | 2003-05-11 |
| CA2218765A1 (en) | 1998-04-25 |
| MX9708212A (en) | 1998-04-30 |
| CN1195905C (en) | 2005-04-06 |
| EP0838542A1 (en) | 1998-04-29 |
| DE59703769D1 (en) | 2001-07-19 |
| AT406385B (en) | 2000-04-25 |
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