Classifications

• • 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
  • C25D5/08—Electroplating with moving electrolyte e.g. jet electroplating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
  • B22D11/059—Mould materials or platings
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D21/00—Processes for servicing or operating cells for electrolytic coating
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D21/00—Processes for servicing or operating cells for electrolytic coating
  • C25D21/10—Agitating of electrolytes; Moving of racks
• • 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
  • C25D5/04—Electroplating with moving electrodes
• • 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
  • C25D7/04—Tubes; Rings; Hollow bodies
• • 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

Definitions

• the invention relates to a method for the galvanic coating of a continuous casting mold according to the preamble of claim 1.
• Continuous casting molds are subject to constant abrasive wear during the casting operation, so that the mold cavity and thus also the cross-sectional dimension of the cast strands becomes ever larger. After a certain number of work cycles, the respective continuous casting mold must therefore be replaced by a new one or reworked.
• Post-processing can be done, for example, by exploding the mold on a mandrel.
• This method is not only relatively complicated, expensive and polluting, but also means a deformation of the outer mold shape, which in turn enlarges a water gap on the mold circumference and thus has a negative impact on the mold cooling.
• the last-mentioned disadvantage also has other known pressing methods for reshaping the molds, in which the mold is first compressed from the outside and then the mold cavity is brought to the original internal dimensions by internal grinding or internal milling.
• EP-A-0 282 759 discloses the mold cavity
• the mold which serves as the cathode, is immersed in an electrolyte bath (Cu sulfate bath) together with a perforated anode basket filled with soluble copper pieces (cubes, spheres, disks) arranged in the mold cavity.
• an electrolyte bath Cu sulfate bath
• a perforated anode basket filled with soluble copper pieces (cubes, spheres, disks) arranged in the mold cavity.
• the copper is deposited from the electrolyte bath and deposited on the mold surfaces, the copper separated from the electrolyte bath being replaced by the dissolved anode copper.
• a relatively low current density for example of about 15 A / dm 2 .
• the present invention is based on the object of proposing a method of the type mentioned at the outset with which the desired cavity dimension can be achieved or attained again as easily as possible, even in the case of continuous casting molds with a cavity having a polygonal cross section, without problem zones occurring in the corner regions of the cavity. Furthermore, the aim is to ensure that the continuous casting molds to be coated remain as unchanged as possible in their external dimensions.
• both a thin layer of the wear-resistant material can be dimensionally accurate without the need for post-processing. is maneuverable, as well as applying a thick layer (with minimal reworking if necessary), since the layer build-up takes place evenly, without corner weaknesses.
• a major advantage of the method according to the invention is that only the inner surfaces of the mold cavity come into contact with the electrolyte during the galvanic coating and therefore the outer surfaces of the continuous casting mold do not have to be covered.
• an intermittent pole reversal anode / cathode is also possible, with which a pulsating deposition of the coating material can be achieved and the coating can be influenced.
• the mechanical properties such as the hardness, and in particular also the structural structure of the coating, can be kept largely uniform over the entire area.
• the coating can be achieved faster than with the conventional methods. Cartilage formation on the coated surfaces can also be largely prevented.
• Fig. 1 shows a schematic diagram of the inventive method.
• a device 1 is shown purely schematically, which is provided for the galvanic coating of inner surfaces 4 delimiting a mold cavity 3 of a continuous casting installation 2 with a wear-resistant coating material for the purpose of reaching or reaching a desired mold cavity dimension.
• the mold cavity 3 can, for example, have a rectangular or square cross section and can therefore be delimited by four inner surfaces 4. However, it could also be a mold with a different mold cavity cross-section (e.g. round, polygonal, elongated) or a so-called dogbone mold.
• the end of the continuous casting mold 2 is assigned a head piece and a base piece 5, 6, which are connected to one another via an anode 7 which projects through the mold cavity 3 are connected. Sealing elements 8, 9 on the end faces of the continuous casting mold 2 seal the mold cavity 3.
• the anode 7 is also inserted sealingly in the head and bottom pieces 5, 6, cf. Seals 13, 14. Both the bottom piece 6 and the head piece 5 are each provided with at least one, preferably with a number of openings 11 and 12 (in FIG. 1, one opening 1, 12 is indicated), the entrance and Form outlet openings for the introduction or outlet of an electrolyte 25 provided for galvanic coating into or out of the otherwise tightly closed mold cavity 3 forming a reactor space.
• This is pumped from a storage tank 15 with the help of a pump 16 from below through the bottom piece 6 in a hydrodynamically controllable manner into the reactor space and is led back to the storage tank 15 or the pump 16 with an overflow (without pressure) on the head piece 5.
• the coating material is added to the electrolyte 25 as an oxide from a container 18.
• the continuous casting mold 2 can be connected as a cathode and the anode 7 with indicated wings 7 'to a direct current source 20 and thereby form a direct current circuit.
• Either the sealing elements 8, 9 or the seals 13, 14 have an electrically insulating effect at the same time.
• the cross-sectional shape of the anode is adapted to the cross-sectional shape of the mold cavity 3.
• Appropriate prismatic anodes are used for polygonal mold cavities.
• the anode consists in particular of a platinum or mixed ceramic coated titanium material or of lead. It can also be designed as a multiple anode. In principle, however, the coating material, such as copper, nickel or chromium, can also be contained in the anode, whereby it would be provided in solid or piece form.
• the method according to the invention is suitable for applying, for example, copper, nickel or chrome layers.
• the coating material is supplied by the electrolyte 25 alone.
• the anode itself is insoluble.
• it can be platinum-coated anodes made of titanium, anodes made of Pb sheet metal, coated mixed ceramics and other materials.
• Methane sulfonic acid, cyanide or sulfuric acid electrolyte types can be used for the electrolytes. With these high-speed electrolytes, a current density of 20 to 40 A / dm 2 can be achieved during intensive electrolyte movement the.
• both a thin layer of the wear-resistant material can be applied with dimensional accuracy, without the need for reworking, and a thick layer (which requires minimal reworking), since the layer structure is uniform and without corner weaknesses he follows.
• the method according to the invention has significant advantages, in particular in the case of chrome plating, since corner problems in particular occur particularly severely with chromium in the case of conventional galvanic plating (layer 5 to 10 times smaller than on the surfaces), and the chromium can only be reworked with grinding.
• a major advantage of the method according to the invention is that only the inner surfaces of the mold cavity come into contact with the electrolyte 25 during the galvanic coating and therefore the outer surfaces of the continuous casting mold do not have to be covered.
• the anode and / or the continuous casting mold could be made rotatable about its longitudinal axis, so that rotation during the coating and thus an improved coating could be made possible.
• the continuous casting mold 2 is cleaned before the coating by a rinsing process, in particular a cascade rinsing, which is not explained in more detail.
• a rinsing process in particular a cascade rinsing, which is not explained in more detail.
• a rinsing process in particular a cascade rinsing, which is not explained in more detail.
• the coating and preferably for this rinsing, it is integrated in a closed system.
• the continuous casting mold consists of a metallic material or material composite, such as copper, aluminum, nickel, a plastic or composite plastic or a ceramic material or other materials.
• a rectifier device can also be provided, by means of which the current direction can be reversed in order to achieve a uniform layer application.
• the continuous casting mold 2 can alternatively only be reinforced in certain areas or in these areas, i.e. coated with a greater layer thickness, in which a relatively higher wear occurs during operation, for example in the area of the bath surface, in which additional wear occurs in particular due to the covering material. This achieves an efficient coating.
• a partial coating can be achieved by partially covering the anode or by inserting non-conductive screens or by similar measures.
• electromagnetic fields can be generated by magnets (not shown in more detail), through which the particles of the coating material are guided or guided in such a way that in certain areas, preferably in the edge areas of the continuous casting mold, a layer of the same thickness is deposited as in the other areas.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• Electroplating Methods And Accessories (AREA)
• Continuous Casting (AREA)
• Electrolytic Production Of Metals (AREA)
• Mold Materials And Core Materials (AREA)

Priority Applications (9)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

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Family Applications (1)

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Cited By (4)

Families Citing this family (5)

Citations (8)

Family Cites Families (10)

• 2003
  • 2003-05-19 PL PL371684A patent/PL206254B1/pl unknown
  • 2003-05-19 ES ES03735416.4T patent/ES2452727T3/es not_active Expired - Lifetime
  • 2003-05-19 AU AU2003236679A patent/AU2003236679B2/en not_active Ceased
  • 2003-05-19 RU RU2004138096/02A patent/RU2318631C2/ru not_active IP Right Cessation
  • 2003-05-19 KR KR1020047019176A patent/KR101082896B1/ko not_active IP Right Cessation
  • 2003-05-19 CN CNB038124483A patent/CN100335200C/zh not_active Expired - Fee Related
  • 2003-05-19 JP JP2004507003A patent/JP5008111B2/ja not_active Expired - Fee Related
  • 2003-05-19 EP EP03735416.4A patent/EP1507612B1/de not_active Expired - Lifetime
  • 2003-05-19 MX MXPA04011734A patent/MXPA04011734A/es active IP Right Grant
  • 2003-05-19 CA CA002504369A patent/CA2504369C/en not_active Expired - Fee Related
  • 2003-05-19 WO PCT/EP2003/005238 patent/WO2003099490A1/de active Application Filing
  • 2003-05-19 BR BRPI0311374-4A patent/BR0311374B1/pt not_active IP Right Cessation
• 2004
  • 2004-11-05 ZA ZA200408991A patent/ZA200408991B/xx unknown

Patent Citations (8)

Non-Patent Citations (4)

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