EP0146702B1 - Verfahren zum kontinuierlichen elektrolytischen Abscheiden von Metallen - Google Patents

Verfahren zum kontinuierlichen elektrolytischen Abscheiden von Metallen Download PDF

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Publication number
EP0146702B1
EP0146702B1 EP84111757A EP84111757A EP0146702B1 EP 0146702 B1 EP0146702 B1 EP 0146702B1 EP 84111757 A EP84111757 A EP 84111757A EP 84111757 A EP84111757 A EP 84111757A EP 0146702 B1 EP0146702 B1 EP 0146702B1
Authority
EP
European Patent Office
Prior art keywords
anode
cathode
strip
electrolyte
metal
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.)
Expired
Application number
EP84111757A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0146702A1 (de
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/de
Application granted granted Critical
Publication of EP0146702B1 publication Critical patent/EP0146702B1/de
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 process for the continuous electrolytic deposition of metals from aqueous solutions of the metal salts on metal strip under high current densities and very low electrolyte voltages at high electrolyte flow rates, the metal strip being guided past a rotating anode and constantly fresh in the gap formed between the anode and cathode Electrolyte solution is introduced, and an apparatus for performing the method.
  • the cost-effectiveness of electrolytic strip finishing systems e.g. B. of plants for galvanizing steel strip depends u. a. 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.
  • a moving, rotating anode for the electrolytic finishing of metal strip is known from GB-A-1 265 921.
  • a metal strip to be selectively strip-shaped electrolytically refined is guided in a straight line by means of a plastic guide at a certain, not too great distance, over a rotating, cylindrical anode, which is immersed in an electrolyte below the axis of rotation.
  • the metal strip is connected to the negative pole of a power source by means of metal springs or metal rollers acting from above and pulled through the guide at a mechanically adjustable distance from the anode.
  • the rotating anode scoop roller conveys the circumference of the electrolyte into the gap between the cathode (band) and the anode, keeps it filled and causes the electrolyte exchange in the anode-cathode space.
  • a disadvantage of this process is that the practically usable electrolysis section on the strip to be finished is very short.
  • the use of the described method is further limited by the fact that the electrolyte is spun off above a certain anode rotation speed.
  • the invention is therefore based on the object of specifying an electrolysis process of the type mentioned at the outset and an apparatus for carrying out the process in which the disadvantages of the aforementioned process are avoided and, in contrast thereto, a larger amount of coating metal per unit of time with a high current density , can be deposited and a longer distance between the anode and the cathode can be set over a longer electrolysis path in order to achieve a lower voltage loss in the electrolyte and accordingly a lower heat development and lower process costs.
  • the object is achieved in such a way that the metal strip is guided around the rotating anode with a wrap angle at the bottom and is separated from it by the hydrodynamic load-bearing action of the electrolyte flow caused by the rotary movement of the anode and the strip movement in the space between the anode and the strip is generated, wherein the device for performing the method is specified in claim 5.
  • the relative movement between the metal strip and the anode and the strip tension determine the anode-cathode distance.
  • the electrolyte flow which produces the load-bearing effect, causes fresh electrolyte solution to be fed continuously into the anode-cathode space and thus no local overheating of the depletion on the metal ions to be deposited.
  • only low tensile stresses have to be applied to the metal strip to be finished, so that its technological values are not impaired.
  • FIGS. 1 to 3 of the drawing using exemplary embodiments.
  • the steel strip 2 After a customary pretreatment of the metal strip, in particular a cold-rolled steel strip 2, namely cleaning by 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), by means of two deflection rollers arranged on the side .
  • the steel strip 2 connected as the cathode is driven by means of driven roller sets, which are not shown, with a strip tension of 2-50 N / mm 2 customary for strip finishing systems, via deflection rollers 3 below and around a metal cylinder 1 designed as an insoluble anode with a wrap angle of approx. 90 ° out.
  • the distance between the anode (metal cylinder 1) and cathode (steel strip 2) is set to z. B. selectively adjustable from less than 2 mm; this prevents contact between the anode and the cathode.
  • high current densities with the lowest separation 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.
  • a change in the relative speed can e.g. B. can be carried out as follows:
  • a gap of 0.936 mm is established at a speed of 5,000 rpm with an electrolyte delivery rate of 573.4 m 3 / h. If the number of revolutions is set to 2,500 rpm, there is a gap of 0.493 mm with a delivery rate of 115 m 3 / h.
  • devices can be 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.
  • FIG. 1 a rotating metal cylinder 1 and a metal band 2 wrapping around it on a part of the circumference is shown in FIG. 1 as a movable anode, the wrapping angle being designated by a.
  • 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 on the side of 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.
  • the distance between the rotating metal cylinder 1 and the running metal strip 2 can be set individually depending on the peripheral speed of the metal cylinder 1 and the strip tension used.
  • 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, below and around which the metal strip 2 is guided by the deflection rollers 3; the current is transferred to the metal strip 2 by 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 and the strip tension used.
  • 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 Verfahren zum kontinuierlichen elektrolytischen Abscheiden von Metallen Expired EP0146702B1 (de)

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
DE19833343978 DE3343978A1 (de) 1983-12-06 1983-12-06 Verfahren zum kontinuierlichen elektrolytischen abscheiden von metallen
DE3343978 1983-12-06

Publications (2)

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

Family

ID=6216116

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111757A Expired EP0146702B1 (de) 1983-12-06 1984-10-02 Verfahren zum kontinuierlichen elektrolytischen Abscheiden von Metallen

Country Status (7)

Country Link
US (1) US4576684A (ja)
EP (1) EP0146702B1 (ja)
JP (1) JPS60125392A (ja)
KR (1) KR850005012A (ja)
AT (1) ATE36015T1 (ja)
DE (2) DE3343978A1 (ja)
ES (1) ES536597A0 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4661213A (en) * 1986-02-13 1987-04-28 Dorsett Terry E Electroplate to moving metal
US9157160B2 (en) 2013-08-22 2015-10-13 Ashworth Bros., Inc. System and method for electropolishing or electroplating conveyor belts

Family Cites Families (15)

* 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
CA940083A (en) * 1969-02-27 1974-01-15 Usui Kokusai Sangyo Kabushiki Kaisha Method of and apparatus for continuously electroplating one side of a steel strip
GB1265921A (ja) * 1970-06-12 1972-03-08
NL7207219A (ja) * 1972-05-27 1973-11-29
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
DE2324834C2 (de) * 1973-05-17 1978-09-07 Dr. Eugen Duerrwaechter Doduco, 7530 Pforzheim Vorrichtung zum kontinuierlichen selektiven Bandgalvanisieren
CH594067A5 (ja) * 1973-10-04 1977-12-30 Galentan Ag
NL7407632A (nl) * 1974-06-07 1975-12-09 Philips Nv Werkwijze en inrichting voor het plaatselijk galvanisch bedekken van bandmateriaal.
NL7609324A (nl) * 1976-08-23 1978-02-27 Philips Nv Inrichting voor het in een continu proces aan- brengen van metaallaagpatronen op een band.
AU526702B2 (en) * 1978-12-29 1983-01-27 Pet Incorporated Heat conserver for bell-type ovens
DE2917630A1 (de) * 1979-05-02 1980-11-13 Nippon Steel Corp Anordnung zur elektrolytischen verzinkung von walzband
GB2117404B (en) * 1982-03-29 1985-07-17 Galentan Ag Device for applying blot-shaped coverings by electro-plating

Also Published As

Publication number Publication date
ATE36015T1 (de) 1988-08-15
DE3472983D1 (en) 1988-09-01
DE3343978A1 (de) 1985-06-20
KR850005012A (ko) 1985-08-19
DE3343978C2 (ja) 1987-12-17
ES8601339A1 (es) 1985-10-16
JPS60125392A (ja) 1985-07-04
EP0146702A1 (de) 1985-07-03
US4576684A (en) 1986-03-18
ES536597A0 (es) 1985-10-16

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