EP0053676A1 - Dispositif pour le dépôt électrolytique de l'aluminium - Google Patents

Dispositif pour le dépôt électrolytique de l'aluminium Download PDF

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Publication number
EP0053676A1
EP0053676A1 EP81108371A EP81108371A EP0053676A1 EP 0053676 A1 EP0053676 A1 EP 0053676A1 EP 81108371 A EP81108371 A EP 81108371A EP 81108371 A EP81108371 A EP 81108371A EP 0053676 A1 EP0053676 A1 EP 0053676A1
Authority
EP
European Patent Office
Prior art keywords
lock
trough
goods
electroplating
contacting
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
EP81108371A
Other languages
German (de)
English (en)
Other versions
EP0053676B1 (fr
Inventor
Siegfried Dr. Rer.Nat. Dipl.-Chem. Birkle
Johann Gehring
Klaus Chem.-Ing. grad. Stöger
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to AT81108371T priority Critical patent/ATE12265T1/de
Publication of EP0053676A1 publication Critical patent/EP0053676A1/fr
Application granted granted Critical
Publication of EP0053676B1 publication Critical patent/EP0053676B1/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
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/06—Suspending or supporting devices for articles to be coated
    • 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
    • C25D17/004—Sealing devices
    • 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
    • C25D21/08—Rinsing
    • 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
    • C25D21/16—Regeneration of process solutions
    • C25D21/20—Regeneration of process solutions of rinse-solutions

Definitions

  • the invention relates to a device for the electrodeposition of aluminum from aprotic, oxygen-free and water-free, organoaluminum electrolytes, with an electroplating trough which is sealed off from the outside and can be acted upon with a protective gas, with an annularly closed electroplating trough, one arranged inside the electroplating trough, around a vertical one Contact and holding device rotatable about the axis of rotation with supporting arms for goods carriers rotating in a horizontal plane and a charging and decharging lock arranged on the electroplating trough and consisting of antechamber and main chamber, in which goods transfer devices which are operable from the outside are arranged.
  • a device of this type has become known from DE-PS 27 16 805.
  • the charging sluice and the decharging sluice are arranged above the electroplating trough and divided into an antechamber and main chamber which are connected to one another via a sliding door.
  • a workpiece transfer device which can be moved between the front and main chamber when the sliding door is open is provided for introducing the goods carriers. Due to the annular design of the electrolyte trough, the goods carriers can be moved in a circular orbit through the electrolyte via the contacting and holding device and coated with aluminum at higher current densities.
  • the ring-shaped design of the electrolyte trough ensures the spatial separation of loading and unloading of the goods Carrier possible by means of charging lock and decharging lock.
  • the contacting and holding device preferably has a plurality of support arms, the arrangement of the charging lock and the decharging lock being matched to the division of the support arms.
  • the various support arms can be supplied with power separately, so that different deposition conditions can be set for different workpieces.
  • the individual support arms can be loaded or emptied simultaneously and in cycles without major interruptions.
  • the main chamber is designed as a condensation space and is equipped with a spray device for spraying a solvent which is compatible with the electrolyte. Using these spray the finished galvanized products can p thunt the Dechargierschleuse of adhering electrolyte residues to be freed in the Hau.
  • a container for receiving a pretreatment bath is arranged in the prechamber of the charging lock and a container for receiving a post-treatment bath is arranged in the prechamber of the decharging lock.
  • a disadvantage of this known electroplating device is not only the complicated structure of the system, in particular the workpiece transfer device, which very much hinders commercial evaluation on a large scale, but above all the lock design used, which is not suitable for keeping air and moisture completely away from the electrolyte and thus to rule out the slow destruction of the same.
  • aluminizing cell in which a lock system with a liquid lock is used to insert and remove the goods to be electroplated.
  • This liquid lock is preceded by a prechamber which has a loading opening and is floodable with inert gas.
  • a prechamber which has a loading opening and is floodable with inert gas.
  • diffusion of oxygen and air humidity can be prevented with a high degree of probability.
  • the goods to be galvanized are introduced on goods racks with the help of an endless conveyor belt from the pre-chamber, which can be flooded with inert gas, through the liquid lock into the electroplating trough and, after the electroplating, are removed again in the opposite direction using the same conveyor belt.
  • a disadvantage of this known device is that the electrolyte is carried over considerably from the electrolyte trough into the liquid lock. Due to the continuous contamination of the lock fluid with the electrolyte and the unavoidable reaction with traces of air and moisture in the prechamber flooded with inert gas, it cannot be prevented that the reaction products on the previously cleaned goods to be aluminized, liquid and discharge sluice is transported to the electroplating room, settle in unfavorable places. These parts can therefore no longer be coated with technically usable aluminum coatings.
  • Such an aluminizing cell is not economical enough for bulk goods, since only one product rack, which is not uncoupled from the conveyor belt even during aluminizing, can be coated.
  • the invention has for its object to develop a device of the type mentioned in such a way that it is simpler in construction, so it especially for aluminizing of bulk goods can be used economically, ie to ensure the simultaneous coating of several goods racks by successively transferring the goods racks transported into the electroplating room to appealing cathode devices. Furthermore, it is to be prevented with relatively simple means that the electrolyte is not damaged by the diffusion of air and moisture or that the electrolyte is dragged out when the goods are removed. Ultimately, with regard to a technically flawless aluminizing process, it must also be ensured that the carefully pretreated goods are not contaminated in the liquid lock prior to aluminizing.
  • the antechamber and main chamber of the charging and decharging locks are connected to each other via a U-shaped liquid lock filled with an aprotic solvent, so that the goods to be treated are carried by the goods carrier of a first endless chain conveyor from the antechamber via the liquid lock and main chamber of the charging lock into the galvanizing trough where they are automatically delivered to the support arms of the contacting and holding device and that the goods carriers are automatically removed from the support arms after treatment of the goods with the aid of a second endless chain conveyor the contacting and holding device are removed, lifted out of the electroplating trough and conveyed out via the liquid lock and antechamber of the decharging lock.
  • the device according to the invention differs in that the antechamber and main chamber of the charging and decharging lock are not connected to one another via a sliding door, but via a liquid lock, which allows a complete separation of the antechamber from the main chamber, which makes diffusion of air and moisture practically impossible.
  • This principle can also be clarified in such a way that the main chamber, which is arranged above the electrolyte level and is preferably designed as a solvent condensation chamber, is sealed off or communicated against the adjacent pre-lock, which can be flooded with inert gas, by means of a common vertical partition wall which is immersed in a trough with inert liquid .
  • the goods carriers carrying the goods are then introduced into the electroplating trough from the pre-sluice flooded with inert gas via the U-shaped liquid sluice and the main chamber filled with inert gas, where they are automatically released to the support arms of the contacting and holding device .
  • the inert liquid of the liquid lock of the charging lock is not contaminated. Above all, no solids are allowed to form in this liquid, because otherwise they can later deteriorate on the surface of the goods during electrodeposition, and can cause pore formation.
  • the precipitation of solid Al compounds (hydroxides) in the inert liquid for example due to the introduction of Al electrolyte from the electrolyte bath during the application process, and due to residual oxygen or air humidity from the pre-lock, must be due to the. starting chemical reaction must therefore be avoided.
  • the automatic transfer or removal of the goods carriers to the support arms of the contacting and holding device can be accomplished in an advantageous manner in that the goods carriers are provided with a transport rod, engage the hook-shaped drivers of the chain conveyor and the ends of which are designed as support and contacting pins which cooperate with correspondingly pan-shaped ends of the fork-shaped support arms of the contacting and holding device.
  • the cross section of the support and contacting pins and the pan-shaped ends of the support arms preferably have a square profile, which results in a good current transfer.
  • a rinsing zone is also provided in the device according to the invention "between the electroplating trough and the liquid lock of the decharging lock, wherein the discharge opening in the electroplating trough for the goods rack is advantageously provided with a shaft-shaped condensation space , which is in communication with the main chamber of the decharging lock to prevent solvents with alkyl vapors from getting into the inert liquid of the liquid lock.
  • the shaft-shaped condensation space preferably contains spray nozzles for spraying one with the electrolyte compatible solvent.
  • the electroplating trough of the device shown consists of an annular and rotationally symmetrical electrolyte trough 1, an upper end cover 2, an upper end hood 3 and a lower end hood 4.
  • the electrolyte trough is suspended in a likewise circular and rotationally symmetrical heating trough 5, which accommodates a heating bath 6 , for example an oil bath.
  • the heating of the heating bath 6 can, as in the case shown, be carried out via heating cartridges 7 or also by connecting to a circulating heating.
  • the electrolyte trough 1 and the heating trough 5 are hung together in a frame 8, which gives the entire device the required static strength.
  • the substantially circular top cover 2 is flanged, which in turn is connected to the upper cover 3.
  • the upper end cover 2 has two inner lock openings 9 and 10 offset by 90 °, as shown in FIG. 3. In Figure 1, only the lock opening 9 in the end cover 2 can be seen.
  • FIG. 3 shows, openings distributed around the circumference of the upper end cover 2 are closed by removable cover segments 11.
  • the lower end cap 4 is flanged to the cylindrical inner wall of the electrolyte trough 1, which has a small height relative to the outer wall. Due to the different heights of the outer wall and inner wall of the electrolyte trough 1, a free space is created in the electroplating trough between the upper end cover 2 and the upper end cover 3 on the one hand and the lower end cover 4 on the other hand. This free space is provided for the accommodation of a contacting and holding device, denoted overall by 12.
  • the contacting and holding device 12 consists of a rotor 121, which has a total of 12 equally spaced support arms 122 with sensors 123 at the fork-shaped ends.
  • the shaft 124 of the rotor 121 which is centrally aligned with respect to the electrolyte trough 1, is rotatably supported by means of two gas-tight flange bearings 125 and is supported at the bottom on an axial bearing 126 connected to the frame 8.
  • the rotor 121 is driven above the upper end cover 3 via bevel gears 127 and 128 by a geared motor 129, which is of explosion-proof design.
  • Each of the 12 support arms 122 has a separate cathode connection 130, only the cathode connection for the support arms 122 lying in the sectional plane of FIG. 1 being shown in the drawing represents is.
  • the connection of the cathode connections 130 to the associated transducers 123 can take place via carbon brushes and slip rings, but this is not shown in the drawing.
  • the free ends of the support arms 122 are fork-shaped and carry the ends 123 of the receptacles, which for the purpose of good contact have a triangular profile in which the correspondingly formed ends of a transport rod 141 provided with a goods carrier 14 are suspended can be.
  • the current transfer is favored by the square profile of the contacting pins 142 and the correspondingly designed transducers 123.
  • the goods carrier 14 can, for example, consist of a type of frame in which the workpieces to be aluminized are fastened, for example with the aid of electrically conductive holding wires.
  • outer anode segments 16 are arranged in an outer ring and inner anode segments 17 are arranged in an inner ring.
  • the outer anode segments 16 are fastened to the outer wall of the electrolyte trough 1 via insulating spacers, while the inner anode segments are fastened to the inner wall of the electrolyte trough 1 via insulating spacers.
  • the already mentioned removable lid segments 11 of the Upper cover 2 allow a quick replacement of the anode segments 16 and 17 and a change in the anode distance.
  • the electroplating trough is charged with a dry protective gas, which is supplied, for example, through a connector 18 attached in the upper cover 3 and metered in such a way that it is always under a slight excess pressure.
  • a dry protective gas supplied, for example, through a connector 18 attached in the upper cover 3 and metered in such a way that it is always under a slight excess pressure.
  • the electroplating trough forms a space which is sealed off from the outside and is exposed to protective gas and which only allows the product carriers to penetrate or be removed through the two inner lock openings 9 and 10 mentioned earlier. So that no ambient air can enter the electroplating trough at these points either, a shaft-shaped condensation chamber 19 is provided above the inner lock opening 9, to which a charging lock 20 is connected.
  • the inner lock opening 10 is also provided with a corresponding condensation space and a decharging lock, which practically corresponds to the charging lock 20.
  • the charging lock 20 consists of a container 201 which is rectangular in plan and in which there is an aprotic solvent 21.
  • the container 201 is divided into a prechamber 203 and a main chamber 204 by a partition 202 immersed in the solvent 21, the latter passing into the condensation chamber 19.
  • the solvent 21 and the partition 202 immersed in it thus form a liquid lock 205 which prevents air and moisture from penetrating into the main chamber 204 and thus into the electrolyte even after the prechamber 203 has been flooded with inert gas 15 makes impossible.
  • the antechamber 203 has an inlet opening 206 for the goods carriers 14 which can be closed in a vacuum-tight manner and which can then be introduced with the aid of an endless transport chain 22 from the antechamber 203 via the liquid lock 205 into the main chamber 204 and from there via the condensation space 19 into the electroplating trough.
  • rollers 221 arranged in the side walls of the container 201 provide two transport chains 22 arranged parallel to one another, which can be driven by a geared motor 222 and a countershaft gear 223 together via a shaft 224.
  • Cross carriers 225 are arranged between the transport chains 22, which automatically take the transport rods 141 of the goods carriers 14 with catch hooks 226 and are able to deposit them in the receptacles 123 of the support arms 122.
  • the input opening of the prechamber 202 which has preferably been previously flooded with inert gas, is opened, a product carrier 14 with the product to be electroplated is hung on the catch hooks 226 and the input opening 206 is closed again.
  • the transport device is then started, the goods carrier 14 being guided through the liquid lock 205 and being delivered via the main chamber 204 to the receptacles 123 of the support arms 122, the catch hooks 226 automatically detaching from the transport rod 141.
  • the removal of the goods carrier 14 is carried out in the same way, except that the transport chains move in the opposite direction.
  • the catch hooks 226 'then automatically grip the transport rod 141 of the goods carrier 14.
  • the inner lock openings 9 and 10 can from the outside still be closed with the help of an externally operable cover 23 if necessary. This may be necessary, for example, if the main chamber 204 needs to be ventilated for some reason.
  • the condensation chamber 19 in a decharging lock is equipped with spray nozzles 191 for spraying the galvanized goods and the goods carriers with a solvent which is compatible with the electrolyte. If necessary, the lid 23 can also be closed for spraying the goods and the solvent used for spraying can be fed to a separate circuit.

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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)
  • Electroplating Methods And Accessories (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Coating With Molten Metal (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
EP81108371A 1980-11-28 1981-10-15 Dispositif pour le dépôt électrolytique de l'aluminium Expired EP0053676B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81108371T ATE12265T1 (de) 1980-11-28 1981-10-15 Vorrichtung zum galvanischen abscheiden von aluminium.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3044975A DE3044975C2 (de) 1980-11-28 1980-11-28 Vorrichtung zum galvanischen Abscheiden von Aluminium
DE3044975 1980-11-28

Publications (2)

Publication Number Publication Date
EP0053676A1 true EP0053676A1 (fr) 1982-06-16
EP0053676B1 EP0053676B1 (fr) 1985-03-20

Family

ID=6117868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81108371A Expired EP0053676B1 (fr) 1980-11-28 1981-10-15 Dispositif pour le dépôt électrolytique de l'aluminium

Country Status (4)

Country Link
US (1) US4363712A (fr)
EP (1) EP0053676B1 (fr)
AT (1) ATE12265T1 (fr)
DE (2) DE3044975C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4759831A (en) * 1986-07-04 1988-07-26 Siemens Aktiengesellschaft Electroplating apparatus particularly for electro-deposition of aluminum
US5779231A (en) * 1993-04-28 1998-07-14 Honda Giken Kogyo Kabushiki Kaisha Vibration-isolating mount device

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3102021C2 (de) * 1981-01-22 1984-02-23 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zum galvanischen Abscheiden von Aluminium
DE3133232A1 (de) 1981-08-21 1983-03-10 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zum galvanischen abscheiden von aluminium
DE3133162C2 (de) * 1981-08-21 1984-08-02 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zum galvanischen Abscheiden von Aluminium
DE3231855A1 (de) * 1982-08-26 1984-03-01 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zum galvanischen abscheiden von aluminium
DE3609077A1 (de) * 1986-03-18 1987-09-24 Karl Trometer Verfahren und vorrichtung zum aufbringen galvanischer ueberzuege
EP1510600A1 (fr) * 2003-08-26 2005-03-02 Aluminal Oberflächtentechnik GmbH & Co. KG Procédé et dispositif pour le revêtement de métal et alliages de métaux à partir d'électrolytes organométalliques
DE102004032659B4 (de) 2004-07-01 2008-10-30 Atotech Deutschland Gmbh Vorrichtung und Verfahren zum chemischen oder elektrolytischen Behandeln von Behandlungsgut sowie die Verwendung der Vorrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2716805A1 (de) * 1977-04-15 1978-10-26 Siemens Ag Vorrichtung zum galvanischen abscheiden von aluminium
DE2901586A1 (de) * 1979-01-17 1980-07-31 Montblanc Simplo Gmbh Aluminierzelle

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2719680A1 (de) * 1977-05-03 1978-11-09 Montblanc Simplo Gmbh Anlage zum aluminieren

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2716805A1 (de) * 1977-04-15 1978-10-26 Siemens Ag Vorrichtung zum galvanischen abscheiden von aluminium
DE2901586A1 (de) * 1979-01-17 1980-07-31 Montblanc Simplo Gmbh Aluminierzelle
EP0013874A2 (fr) * 1979-01-17 1980-08-06 Montblanc-Simplo GmbH Installation pour le dépôt électrolytique de l'aluminium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4759831A (en) * 1986-07-04 1988-07-26 Siemens Aktiengesellschaft Electroplating apparatus particularly for electro-deposition of aluminum
US5779231A (en) * 1993-04-28 1998-07-14 Honda Giken Kogyo Kabushiki Kaisha Vibration-isolating mount device

Also Published As

Publication number Publication date
DE3169426D1 (en) 1985-04-25
EP0053676B1 (fr) 1985-03-20
DE3044975A1 (de) 1982-06-03
DE3044975C2 (de) 1985-10-31
US4363712A (en) 1982-12-14
ATE12265T1 (de) 1985-04-15

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