EP0146702A1 - Procédé pour le dépôt électrolytique continu de métaux - Google Patents

Procédé pour le dépôt électrolytique continu de métaux Download PDF

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Publication number
EP0146702A1
EP0146702A1 EP84111757A EP84111757A EP0146702A1 EP 0146702 A1 EP0146702 A1 EP 0146702A1 EP 84111757 A EP84111757 A EP 84111757A EP 84111757 A EP84111757 A EP 84111757A EP 0146702 A1 EP0146702 A1 EP 0146702A1
Authority
EP
European Patent Office
Prior art keywords
anode
cathode
strip
metal
electrolyte
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84111757A
Other languages
German (de)
English (en)
Other versions
EP0146702B1 (fr
Inventor
Werner Bechem
Hubertus Peters
Jürgen Solms
Dietrich Dr. Wolfhard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoesch AG
Original Assignee
Hoesch AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hoesch AG filed Critical Hoesch AG
Priority to AT84111757T priority Critical patent/ATE36015T1/de
Publication of EP0146702A1 publication Critical patent/EP0146702A1/fr
Application granted granted Critical
Publication of EP0146702B1 publication Critical patent/EP0146702B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils
    • 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
    • C25D5/007—Electroplating using magnetic fields, e.g. magnets
    • 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
    • C25D5/011—Electroplating using electromagnetic wave irradiation

Definitions

  • the invention relates to a method for the continuous electrolytic deposition of metals from aqueous solutions of the metal salts on metal strip using a high flow rate of the electrolyte between anode and cathode to achieve high current densities at low voltages, in particular for the electrolytic coating of steel strip with non-ferrous metals, preferably with zinc. and an apparatus for performing the method.
  • anodes are usually adjustable and, insofar as they are soluble anodes, are displaceable and exchangeable.
  • the anodes are not movable with respect to the tape running direction.
  • the known disadvantages of such systems include due to the minimum distances to be maintained between the cathodically connected strip to be refined and the anodes. These distances are necessary to prevent the strip from touching the anodes. Due to the fact that when rolling the strip occurring tension differences often lead to a certain ripple of the strip edge and / or the strip center, which makes strip-anode spacings of at least approx. lo - 50 mm necessary in horizontal and vertical finishing systems.
  • the economics of electrolytic strip finishing lines depends, among other things. on the possibility of achieving high current densities in the galvanic process at acceptable voltages.
  • the maximum current density that can be achieved depends on the thickness of the Nernst and Prandl boundary layers that determine the galvanic reaction kinetics.
  • high flow velocities of the electrolyte are used to reduce these boundary layer thicknesses. Given the distances mentioned between the anode and the strip to be coated, large amounts of the electrolyte have to be pumped around for this purpose, which necessitates the installation of corresponding pump units with high energy consumption.
  • the invention has for its object to provide a method of the type mentioned, by means of which the disadvantages of the known methods are avoided and by means of which a very small distance between the anode and cathode can be adjusted and regulated, in particular in the case of a one-sided coil coating, low voltage losses in the electrolyte and accordingly a lower heat development is achieved, a very quick exchange of the electrolyte in the gap between the anode and the cathode is brought about and a high current density is achieved and finally the technological values of the strip are not impaired by a very low tensile stress of the strip to be coated.
  • this object is achieved in such a way that the metal strip is guided as a cathode past a moving anode and fresh electrolyte solution is constantly introduced into the gap formed between the anode and cathode. In this way, a hydrodynamically bearing flow state of the system is achieved.
  • the device for carrying out the method is preferably constructed in such a way that a metal cylinder connected and driven as an anode is arranged in an electrolyte bath, around which the metal strip to be finished, which is connected as the cathode, is guided.
  • a metal cylinder connected and driven as an anode is arranged in an electrolyte bath, around which the metal strip to be finished, which is connected as the cathode, is guided.
  • the steel strip 2 After a customary pretreatment of the cold-rolled metal strip, in particular the steel strip 2, namely cleaning by pre-degreasing and pickling, the steel strip 2 is guided around a metal cylinder 1, which is arranged in an electrolytic bath and is driven by a motor, not shown.
  • the steel strip 2, which is connected as a cathode, is driven by means of driven roller sets, which are not shown, with a strip tension of 2-5o N / mm 2 , which is customary for strip finishing plants, via wrapping rollers 3 with a wrapping angle of 0 (approx. 9 0 ° around a metal cylinder designed as an insoluble anode 1 led.
  • electrolyte is pumped or introduced into the gap between the metal cylinder 1 and the steel band 2, so that the steel band 2 is carried by the electrolyte below the circumferential surface of the metal cylinder 1 without using additional pump units have to.
  • high current densities with the lowest deposition voltages of 0.5 to 10 volts are achieved with an adapted supply of metal ions by means of a precisely metered amount of electrolyte; this in turn is achieved by means of the adjustable speed of the metal cylinder 1.
  • Another option for regulating the distance between the anode and cathode is provided by changing the strip tension.
  • devices are provided for generating electrical or magnetic fields, by means of which the metal ions in the area of the boundary layers are accelerated in a targeted manner.
  • the steel strip 2 After the steel strip 2 has been coated by means of the device described above, depending on the required layer thickness of the metal to be applied, further treatment is possible in other devices constructed in the same way. After the metal layer has been applied to the steel strip 2, it is aftertreated in the usual manner, i.e. as far as it is required phosphated, chromated, dried etc. and finally coiled up.
  • a rotating metal cylinder 1 with a wrapped metal band 2, which wraps around the angle ⁇ around the anode, is shown as a movable anode in FIG. 1.
  • Electrolyte is pumped into the gap between the metal cylinder 1 and the metal strip 2 by means of the rotating metal cylinder 1 and, due to the surface roughness and peripheral speed of the metal cylinder, a certain amount of electrolyte is conveyed.
  • the guidance of the metal strip 2 takes over two deflection rollers 3, which are arranged laterally below the metal cylinder 1 and are preferably rubberized and driven.
  • the current is transferred to the metal strip 2 by line-contacting current rollers 4, between which the metal strip 2 runs.
  • the distance between the rotating metal cylinder 1 and the running metal strip 2 is individually determined by the Um-. catch speed of the metal cylinder 1 adjustable.
  • FIG. 2 shows a similar application of the method according to the invention as shown in FIG. 1; 1, the transmission of the current to the metal strip 1 by partially wrapped current rollers 4 is provided here.
  • the possibility of finishing on both sides is given with a device according to FIG. 3.
  • the device is in turn formed by the rotating metal cylinder 1 as an anode, past which the metal strip 2 is guided by the deflection rollers 3; the current transfer to the metal strip 2 takes place through the current-contacting current rollers 4.
  • the gap between the metal strip 2 and the metal cylinder 1 is in turn set by means of the peripheral speed of the rotating metal cylinder 1.
  • an insoluble anode 5 is preferably used.
  • this anode 5 can also be replaced by a soluble anode.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Electrolytic Production Of Metals (AREA)
EP84111757A 1983-12-06 1984-10-02 Procédé pour le dépôt électrolytique continu de métaux Expired EP0146702B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84111757T ATE36015T1 (de) 1983-12-06 1984-10-02 Verfahren zum kontinuierlichen elektrolytischen abscheiden von metallen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3343978 1983-12-06
DE19833343978 DE3343978A1 (de) 1983-12-06 1983-12-06 Verfahren zum kontinuierlichen elektrolytischen abscheiden von metallen

Publications (2)

Publication Number Publication Date
EP0146702A1 true EP0146702A1 (fr) 1985-07-03
EP0146702B1 EP0146702B1 (fr) 1988-07-27

Family

ID=6216116

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111757A Expired EP0146702B1 (fr) 1983-12-06 1984-10-02 Procédé pour le dépôt électrolytique continu de métaux

Country Status (7)

Country Link
US (1) US4576684A (fr)
EP (1) EP0146702B1 (fr)
JP (1) JPS60125392A (fr)
KR (1) KR850005012A (fr)
AT (1) ATE36015T1 (fr)
DE (2) DE3343978A1 (fr)
ES (1) ES8601339A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0240671A1 (fr) * 1986-02-13 1987-10-14 Metal Coatings International Inc. Application d'une plaque électrolytique à un métal mouvant

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9157160B2 (en) 2013-08-22 2015-10-13 Ashworth Bros., Inc. System and method for electropolishing or electroplating conveyor belts

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1262429A (en) * 1969-02-27 1972-02-02 Usui Kokusai Sangyo Kk Method of and apparatus for continuously electroplating one side only of a plateable metal strip
GB1265921A (fr) * 1970-06-12 1972-03-08
FR2189264A1 (fr) * 1972-05-27 1974-01-25 Philips Nv
DE2303128A1 (de) * 1973-01-23 1974-08-01 Platmanufaktur Ab Aus mehreren schichten aufeinander gestapelter verpackungsgegenstaende bestehendes kolli, sowie verfahren und maschine zur herstellung desselben
DE2447091A1 (de) * 1973-10-04 1975-04-10 Galentan Ag Verfahren und vorrichtung zum kontinuierlichen auftragen von streifen-, band- oder fleckenfoermiger bedeckungsschichten auf ein metallband
DE2225391B2 (de) * 1971-05-25 1976-04-22 Galentan AG, Zug (Schweiz) Vorrichtung zum kontinuierlichen galvanisieren von linien oder einzelflaechen auf metallstreifen
GB1458922A (en) * 1973-05-17 1976-12-15 Duerrwaechter E Dr Doduco Apparatus for electroplating foil strip
AT336365B (de) * 1974-06-07 1977-05-10 Philips Nv Verfahren und vorrichtung zum ortlichen galvanisieren von bandmaterial
DE2737843A1 (de) * 1976-08-23 1978-03-09 Philips Nv Vorrichtung zum anbringen von metallschichtmustern auf einem band in einem kontinuierlichen prozess
AU526702B2 (en) * 1978-12-29 1983-01-27 Pet Incorporated Heat conserver for bell-type ovens
GB2117404A (en) * 1982-03-29 1983-10-12 Galentan Ag Device for applying blot-shaped coverings by electro-plating

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT119031B (de) * 1929-03-05 1930-09-25 Oesterr Alpine Montan Einrichtung zur elektrolytischen Herstellung von Blech, Band-, Profileisen od. dgl.
US2461556A (en) * 1943-04-01 1949-02-15 Carnegie Illinois Steel Corp Method and apparatus for the electrolytic coating of metal strip
US3483098A (en) * 1966-02-11 1969-12-09 United States Steel Corp Method and apparatus for electroplating a metallic strip
US3483113A (en) * 1966-02-11 1969-12-09 United States Steel Corp Apparatus for continuously electroplating a metallic strip
DE2917630A1 (de) * 1979-05-02 1980-11-13 Nippon Steel Corp Anordnung zur elektrolytischen verzinkung von walzband

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1262429A (en) * 1969-02-27 1972-02-02 Usui Kokusai Sangyo Kk Method of and apparatus for continuously electroplating one side only of a plateable metal strip
GB1265921A (fr) * 1970-06-12 1972-03-08
DE2225391B2 (de) * 1971-05-25 1976-04-22 Galentan AG, Zug (Schweiz) Vorrichtung zum kontinuierlichen galvanisieren von linien oder einzelflaechen auf metallstreifen
DE2265041B2 (de) * 1971-05-25 1977-04-21 Ausscheidung aus: 22 25 391 Galentan AG, Zug (Schweiz) Vorrichtung zum kontinuierichen galvanisieren von linien oder einzelflaechen auf metallstreifen
FR2189264A1 (fr) * 1972-05-27 1974-01-25 Philips Nv
DE2303128A1 (de) * 1973-01-23 1974-08-01 Platmanufaktur Ab Aus mehreren schichten aufeinander gestapelter verpackungsgegenstaende bestehendes kolli, sowie verfahren und maschine zur herstellung desselben
GB1458922A (en) * 1973-05-17 1976-12-15 Duerrwaechter E Dr Doduco Apparatus for electroplating foil strip
DE2447091A1 (de) * 1973-10-04 1975-04-10 Galentan Ag Verfahren und vorrichtung zum kontinuierlichen auftragen von streifen-, band- oder fleckenfoermiger bedeckungsschichten auf ein metallband
AT336365B (de) * 1974-06-07 1977-05-10 Philips Nv Verfahren und vorrichtung zum ortlichen galvanisieren von bandmaterial
DE2737843A1 (de) * 1976-08-23 1978-03-09 Philips Nv Vorrichtung zum anbringen von metallschichtmustern auf einem band in einem kontinuierlichen prozess
AU526702B2 (en) * 1978-12-29 1983-01-27 Pet Incorporated Heat conserver for bell-type ovens
GB2117404A (en) * 1982-03-29 1983-10-12 Galentan Ag Device for applying blot-shaped coverings by electro-plating

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, unexamined applications, C Field, Vol. 6, No. 186, 22. September 1982 THE PATENT OFFICE JAPANESE GOVERNMENT Seite 155 C 126 *
PATENT ABSTRACTS OF JAPAN, unexamined applications, C Field, Vol. 7, No. 219, 29. September 1983 THE PATENT OFFICE JAPANESE GOVERNMENT Seite 20 C 188 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0240671A1 (fr) * 1986-02-13 1987-10-14 Metal Coatings International Inc. Application d'une plaque électrolytique à un métal mouvant

Also Published As

Publication number Publication date
ES536597A0 (es) 1985-10-16
DE3343978C2 (fr) 1987-12-17
DE3343978A1 (de) 1985-06-20
ES8601339A1 (es) 1985-10-16
US4576684A (en) 1986-03-18
EP0146702B1 (fr) 1988-07-27
JPS60125392A (ja) 1985-07-04
ATE36015T1 (de) 1988-08-15
KR850005012A (ko) 1985-08-19
DE3472983D1 (en) 1988-09-01

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