EP1722012A1 - Dispositif de traitement d'un métal dans un bain électrolytique et procédé de réduction de dégagements d'aérosols - Google Patents

Dispositif de traitement d'un métal dans un bain électrolytique et procédé de réduction de dégagements d'aérosols Download PDF

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Publication number
EP1722012A1
EP1722012A1 EP06009037A EP06009037A EP1722012A1 EP 1722012 A1 EP1722012 A1 EP 1722012A1 EP 06009037 A EP06009037 A EP 06009037A EP 06009037 A EP06009037 A EP 06009037A EP 1722012 A1 EP1722012 A1 EP 1722012A1
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EP
European Patent Office
Prior art keywords
cathode
gas bubbles
hydrogen
electrolyte
acid
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.)
Withdrawn
Application number
EP06009037A
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German (de)
English (en)
Inventor
Christoph Thönes
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.)
Over-Rose Christine A
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Over-Rose Christine A
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Filing date
Publication date
Application filed by Over-Rose Christine A filed Critical Over-Rose Christine A
Publication of EP1722012A1 publication Critical patent/EP1722012A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • C25D21/04—Removal of gases or vapours ; Gas or pressure control
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/005—Apparatus specially adapted for electrolytic conversion coating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • 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
    • C25D5/003—Electroplating using gases, e.g. pressure influence

Definitions

  • the invention relates firstly to a device for treating a metal in an electrolyte bath, such as the anodizing of aluminum, with a cathode and with an anode.
  • the invention relates to a method for reducing aerosol discharge during electrolysis of metal from an electrolyte bath into the environment in which a metal is poled as a cathode.
  • wetting agents for reducing the surface tension or the interfacial tension are added to a sulfuric acid-containing electrolyte.
  • Sulfuric acid is used as the electrolyte in particular in anodizing processes to form an aluminum oxide layer on aluminum by electrolysis.
  • the aluminum component to be anodized is an anode and, for example, further aluminum plates which are distributed in the electrolyte bath, for example, at the edge, are connected as a cathode.
  • a different amount of hydrogen gas is generated at the cathode, which bubbles rise up as bubbles during the electrolysis in the electrolyte bath and with the Sulfuric acid wetted bubble surfaces take sulfuric acid into the environment. These hydrogen gas bubbles burst in the air, releasing the sulfuric acid in the environment.
  • Aerosols are usually unstable colloidal systems, since dispersant and colloidal portion have significant density differences and the Brownian molecular motion is thereby very strong. Frequent collisions of the colloids in the only weakly viscous dispersant can lead to coagulation. The higher the aerosol concentration and the larger the aerosol particles are, the faster they settle on the ground.
  • the wetting agents mentioned in the introduction are suitable for producing a foam layer on the electrolyte, by means of which it is prevented within limits that aerosols escape from an electrolyte bath and enter the environment.
  • a number of conditions must be met.
  • the dosage of the wetting agent must be carefully selected and carried out.
  • a re-dosing is often required and made to ensure a sufficient foam layer permanently.
  • the object of the invention is firstly achieved by a device for treating a metal in an electrolyte bath, such as the anodization of aluminum, with a cathode and with an anode, which is characterized by means for agglomerating formed during the electrolysis of primary gas bubbles.
  • an agglomeration of the cathode at the primary hydrogen gas bubbles to secondary hydrogen gas bubbles, which are distinguished from the primary gas bubbles by a larger volume and thus make the total volume forth a smaller surface for receiving sulfuric acid ready, is advantageous because this is achieved effectively that at the same amount of hydrogen significantly less sulfuric acid of the electrolyte bath is released into the environment.
  • legally required contamination limits below which occupational safety is particularly improved are particularly improved.
  • the term "means for agglomerating" comprises any means which are suitable, in particular, for combining primary gas bubbles, such as hydrogen gas bubbles, together or with other gas bubbles.
  • the aim of the present agglomeration means is to reduce the total surface area of the gas bubbles by connecting individual gas bubbles.
  • primary gas bubbles describes in the context of the application, in particular hydrogen gas bubbles, which are formed during the electrolysis at the cathode.
  • secondary gas bubbles which, in the sense of the invention, detect gas bubbles which are essentially agglomerated from primary gas bubbles.
  • the secondary gas bubbles are distinguished from the primary gas bubbles by their larger volume.
  • the invention is also solved by a method for reducing an aerosol discharge during an electrolysis of metal from an electrolyte bath into the environment in which a metal is poled as a cathode and in particular during the electrolysis resulting primary gas bubbles are agglomerated into other gas bubbles or gas bubbles.
  • the agglomerate reduces the useful surface area for wetting with sulfuric acid with an identical volume of space, so that less sulfuric acid adheres to the secondary gas bubble resulting from a plurality of primary gas bubbles, which can enter the environment with hydrogen, for example.
  • the object of the invention is achieved by a device for the electrolytic treatment of a metal in an electrolyte bath, such as the anodization of aluminum, with a cathode and with an anode, wherein the device by means for separating during the electrolysis at the cathode distinguished hydrogen and an acid of the electrolyte bath.
  • an electrolyte bath such as the anodization of aluminum
  • the means for separating hydrogen and an acid allow essentially only pure hydrogen to be released into the environment, wherein the previously separated acid is preferably recycled to the electrolyte bath. As a result, contamination of the environment with acid is ideally completely prevented.
  • agents which provide a surface which is suitable for being wetted by acid are particularly suitable as agents for separating.
  • the acid bound to the hydrogen adheres to the surface of the release agent as soon as the acid comes into contact with this surface. In this case, the acid adhering to the hydrogen is separated from this hydrogen.
  • the object of the invention is also achieved by a method for reducing an aerosol discharge during an electrolysis of metal from an electrolyte bath into the environment, in which a metal is poled as a cathode, in which one of the primary gas bubbles, on the other gas bubbles and / or acid adhering to the gas bubbles is supplied to surfaces provided therefor and the surfaces are wetted, so that the acid is separated from the primary gas bubbles, from the further gas bubbles and / or from the gas bubbles.
  • the object of the invention is further solved by a device for electrolytic treatment of a metal in an electrolyte bath, such as the anodizing of aluminum, with a cathode and with an anode, the device being defined by a collection chamber for an aerosol, in particular for at Cathode resulting hydrogen, excels.
  • the hydrogen produced at the cathode does not pass directly unhindered and not contaminated with acid into the environment, but the hydrogen produced at the cathode is previously collected in the collecting chamber and temporarily stored there and separated from the acid. Only then does the hydrogen produced at the cathode, ideally completely separated from acid, pass from the collection chamber into the environment. As a rule, the hydrogen evaporates very quickly from the collection chamber into the environment.
  • the collection chamber may also be referred to as a separation chamber.
  • hydrogen produced at the cathode means hydrogen gas bubbles with an electrolyte adhering thereto, in particular with an adhering acid of an electrolyte bath.
  • the hydrogen produced at the cathode is essentially present within the electrolyte as primary gas bubbles or hydrogen gas bubbles. It can not be ruled out, however, that a small proportion of primary gas bubbles already agglomerate in the electrolyte itself to the other secondary gas bubbles. However, this is the exception and brings no appreciable reduction in the release of aerosol in the environment, so that this vanishingly small proportion is presently negligible.
  • the hydrogen gas bubbles emerge from the electrolyte that is, are located above the surface of the electrolyte, the present case is primarily of aerosol or hydrogen, to which the electrolyte or an acid adheres. In the collection chamber above the electrolyte surface so substantially aerosol is collected. Pure hydrogen in the sense of the patent application is present when the hydrogen already separated from the acid and further into the environment.
  • An embodiment variant provides that the collecting chamber surrounds the cathode at least partially, preferably completely.
  • the cathode is completely surrounded by the collection chamber, so that with proper operation, the danger can be almost completely excluded that primary gas bubbles do not get out of the collection chamber of the cathode into the environment.
  • the collection chamber is located above the surface of the electrolyte bath. Since the primary gas bubbles produced in the cathode naturally strive or rise in the electrolyte only to the surface of the electrolyte bath and then enter the environment, it is usually sufficient if the collecting chamber is arranged only above the surface of the electrolyte bath. Thus, primary gas bubbles projecting out of the electrolyte are captured as an aerosol directly on the surface of the electrolyte bath.
  • the collection chamber is arranged between the cathode and a cathode connection device.
  • the collecting chamber is provided in particular in this area.
  • cathode connection device is understood as meaning any device which is suitable for keeping a cathode sufficiently stable and stationary in an electrolyte bath and in this case supplying it with current.
  • agglomerating primary gas bubbles are arranged in the collection chamber.
  • the agglomeration agents are suitable for reducing the total gas bubble surface area.
  • means for enlarging a wettable surface are arranged in the collecting chamber.
  • the means for increasing the wettable surface increase the surface area of the walls of the collection chamber. If the surface to be wetted by an acid within the collecting chamber is increased, it is possible to retain more acid than would be possible without such a means for enlarging the wettable surface.
  • the means for enlarging a wettable surface comprise hollow bodies.
  • the hollow body may have a variety of geometric shapes.
  • hollow bodies are particularly well, since hollow bodies can always be produced with a lower mass than comparable solid bodies.
  • An enlargement of the wettable surface also succeeds when structures made of a fabric-like material are arranged in the collecting chamber. Also by means of the fabric-like material, an enlargement of the wettable surface is realized.
  • glass wool and / or rock wool can be arranged in the collecting chamber. It is also possible by means of glass wool and / or rock wool to realize a surface enlargement within the collecting chamber.
  • a particularly preferred embodiment provides that the collection chamber has a permeable barrier which separates the collection chamber from the environment.
  • permeable barrier is understood to mean a separating device which allows hydrogen which has formed at the cathode, for example in the form of primary gas bubbles, to be released into the environment only in a delayed manner Hydrogen-bonding acid is separated from this hydrogen. Thus, enough time remains to deposit an acid adhering to the primary gas bubbles, so that the acid does not enter the environment.
  • a particularly preferred embodiment provides that the barrier is made of a pressure forces and / or tensile forces conductive material.
  • the present barrier is made of a strong and stable material, the terms “solid” and “stable” being not to be confused with rigid. Rather, the material chosen for the barrier may also be flexible, as is the case, for example, with a woven material.
  • the barrier has more than one component and / or more than one component group. This makes it possible to optimally design the barrier so that, for example, different Materials are used on differently stressed areas of the barrier.
  • At least part of the collecting chamber or at least part of a collecting chamber barrier are arranged below the surface of the electrolyte bath.
  • the cathode has a shell.
  • the cathode is surrounded by an envelope, the risk is reduced that, in particular, hydrogen gas bubbles which are produced as electrolysis directly at the cathode as small gas bubbles (primary gas bubbles) transport sulfuric acid as an aerosol from the electrolyte bath into the environment.
  • the shell thus prevents many small hydrogen gas bubbles in the area of the cathode from reaching the electrolyte bath surface and unhindered into the environment, where they then burst open and release sulfuric acid into the ambient air.
  • the small hydrogen gas bubbles within the envelope agglomerate into larger hydrogen gas bubbles, which have a much smaller surface area and thus can bind much less sulfuric acid. As a result, passes, if any, a much smaller amount of sulfuric acid outside the electrolyte bath and into the environment.
  • the primary gas bubbles are subjected to a surface reduction.
  • the shell is permeable. At least the shell should be constructed to be permeable to hydrogen.
  • the shell comprises means for agglomerating primary gas bubbles.
  • the shell comprises means for separating hydrogen and acid.
  • the shell comprises a barrier for a collection chamber.
  • the shell is formed in such a way that it forms the collecting chamber already described above.
  • the shell surrounds a part of the cathode which projects into the electrolyte bath.
  • the object of the invention is also achieved by a method for reducing an aerosol delivery, in particular during an electrolysis of metal from an electrolyte bath into the environment, in which a metal is poled as a cathode, and the cathode is at least partially surrounded by a shell.
  • small hydrogen gas bubbles may still be formed on a cathode provided with a shell in this way. These are but first prevented from rising above the Elektrolytbadober Assembly directly into the environment and burst there with the disadvantages described above. Rather, the small primary hydrogen gas bubbles under the envelope - that is, on the side of the envelope facing the cathode - agglomerate into further hydrogen gas bubbles of increased volume, rising to the surface of the electrolyte within the envelope or between the envelope and the cathode , In particular, the primary hydrogen gas bubbles agglomerate within the collection chamber described above.
  • a preferred variant of the method provides that the shell is formed on the cathode, in particular between the cathode and a cathode connection device, to form a collection chamber for aerosol and / or for hydrogen with adhering acid.
  • the shell advantageously provides a region at the cathode in which the hydrogen formed at the cathode collects essentially as an aerosol and the hydrogen separates from the electrolyte.
  • the cathode can be structurally particularly easily surrounded with a shell, when the sheath is wound around the cathode. It has been found that a considerable reduction in aerosol release to the environment is also achieved on a cathode wrapped with a sheath.
  • the sheath In order for the sheath to be as close as possible to the cathode when required, it is advantageous if the sheath is wound around the cathode under tensile stress.
  • the envelope comprises a fleece.
  • a nonwoven advantageously has small pores, so that a nonwoven influences the actual processing process, if at all, only negligibly.
  • the primary hydrogen gas bubbles it is scarcely possible for the primary hydrogen gas bubbles to penetrate laterally through a fleece used as a barrier since the primary hydrogen bubbles can not exert enough pressure on the fleece on a substantially vertically running fleece.
  • the electrolysis per se is not influenced at all or only negligibly, since the fleece ideally hardly affects the current flow between the cathode and the anode since, owing to its structure, it offers only a low resistance.
  • the envelope is a fleece made of a polypropylene.
  • Polypropylene was particularly suitable as a fleece because it is acid-resistant.
  • a fleece made of a polypropylene has a low expansion coefficient and is particularly easy to work.
  • the sheath to completely surround the cathode.
  • the cathode is preferably completely surrounded by the polypropylene non-woven up to the junction of a power supply.
  • the sheath In order for the sheath to receive additional support at the cathode, it is advantageous if the sheath is additionally fastened to the cathode by means of fastening means.
  • the fastening means have a distance of less than 50 cm, preferably a distance of 20 cm.
  • the fastening means preferably extend along the longitudinal axis of the cathode, so that the sheath is additionally fastened thereto well along the length of the cathode.
  • screws are used as fastening means, which are screwed into the cathode, whereby the shell is additionally fixed to the cathode.
  • the cathode 5 is slightly more than half immersed in the electrolyte 2.
  • the aluminum bar 6, ie the cathode 5, is surrounded by a fleece 9 such that the fleece 9 extends to the holder 7 and completely surrounds the aluminum bar 6.
  • the particles 4 migrate to an aluminum component 14 which is connected as an anode 13.
  • the aluminum component 14 is connected positively by means of a further wiring 15.
  • the cathode 107 shown in FIG. 2 is fastened with its upper end 120 to a cathode holding bar 121.
  • the cathode 107 is immersed vertically down into an electrolyte bath 101.
  • the cathode 107 is surrounded in this embodiment by about 2/3 of a shell 109.
  • the sheath 109 extends in particular from a lower end 122 of the cathode 107, which is immersed in the electrolyte bath 101, into a region 123 below the cathode holding bar 121.
  • the sheath 109 is in the region 123 by means of a first closing rail 124 and a second closing rail 125 firmly pressed to the cathode 107.
  • the sheath 109 thus forms a barrier with which, in particular above the electrolyte bath surface 126, a collecting chamber 127 is formed, in which hydrogen 110 formed at the cathode 107 collects as an aerosol and the hydrogen 110 is separated from the electrolyte 102 there.
  • the small hydrogen bubbles 110 which are formed as small primary gas bubbles at the cathode 107 and rise in the electrolyte bath 101, take on leaving the electrolyte bath 101 amounts of electrolyte 102, in particular of acid, with the electrolyte bath surface 126 beyond.
  • these primary gas bubbles 110 with the acid adhered thereto do not enter the environment 112 as an aerosol, but are retained in the collection chamber 127.
  • the primary gas bubbles 110 agglomerate there to larger hydrogen gas bubbles 110A. Even if such agglomeration of the primary gas bubbles 110 in the collection chamber 127 fails or not all the primary gas bubbles 110 connect to larger hydrogen gas bubbles 110A, the envelope 109 prevents the acid adhering to the hydrogen gas bubbles 110A from blocking the acid from the collection chamber 127 in the environment 112 passes. Thus, although the hydrogen can penetrate the shell 109 and escape from the collection chamber 127.
  • the sheath 109 is made in this embodiment as a fabric bag made of polypropylene.
  • the fabric material has a specific gravity of 110 g / m 2 .
  • any fabric which is electroconductive and acid resistant may be employed so long as it has some hydrogen permeability but retains an acid which adheres to hydrogen gas bubbles and is thus impermeable to that acid.
  • the cathode 207 shown in FIG. 3 is fastened with its upper end 220 to a cathode holding bar 221.
  • the lower end 222 of the cathode 207 is surrounded by a shell 209.
  • the sheath 209 forms a barrier which at least partially surrounds the cathode 207. By means of this barrier is prevented that one Aerosol of hydrogen and acid unhindered in the environment 212 passes.
  • the shell 209 forms at least above the electrolyte bath surface 226 a collecting chamber 227, in which hydrogen bubbles 210 ascending from the electrolyte 202 collect in the form of aerosol and the electrolyte 202 is separated from the hydrogen.
  • the collection chamber 227 is filled in this embodiment with hollow bodies 230 which float on the electrolyte 202 and thus remain substantially above the electrolyte bath surface 226.
  • the hollow bodies 230 constitute, on the one hand, means for enlarging a wettable surface within the collecting chamber 227.
  • the hollow bodies 230 form means for separating hydrogen and acid within the collecting chamber 227.
  • primary gas bubbles 210 merge to form further gas bubbles or gas bubbles, which form a smaller overall surface at approximately identical volume, at which the electrolyte 202, in particular the acid present in the electrolyte 202, can adhere.
  • the barrier of hollow bodies 230 provides a very large surface area at which this acid of the further gas bubbles or gas bubbles can deposit.
  • the "cleaned” hydrogen 228 now passes the barrier of hollow bodies 230 and in this case passes from the collecting area 227 into the environment 212.
  • the acid previously adhering to the hydrogen remains completely in the collecting chamber 227 and is returned to the electrolyte bath 201.
  • FIG. 4 shows a further arrangement comprising a cathode 307, a cathode holding bar 321 and a casing 309, which encloses at least the lower end 322 of the cathode 307, that is to say the cathode 307 facing the electrolyte bath 301.
  • a collecting chamber 327 for aerosol is formed from hydrogen gas bubbles 310 formed at the cathode 307 and an electrolyte 302 of the electrolyte bath 301.
  • the collection chamber 327 is filled with glass wool 335 in this embodiment.
  • glass wool 335 can within the collection chamber 327, an increase of the wettable surface can be achieved, at which hydrogen gas bubbles 310 or hydrogen gas bubbles 310A adhering acid (electrolyte 302) can be deposited.
  • electrophilyte 302 hydrogen gas bubbles 310 or hydrogen gas bubbles 310A adhering acid
  • the alternative arrangement of a cathode 407 on a cathode support bar 421 shown in FIG. 5 comprises a shell 409.
  • the shell 409 forms a barrier around the cathode 407 and has above the electrolyte bath surface 426 a collection chamber 427 for an aerosol of hydrogen and electrolyte 402 adhering thereto.
  • the shell 409 is barrier-free at its end 440 facing away from the collection chamber 427.
  • carrier-free means that hydrogen gas bubbles 410 formed at the cathode 407 during electrolysis could pass through the envelope 409 unhindered.
  • this barrier-free area is located below the cathode 407 and the primary hydrogen gas bubbles 410 are toward the electrolyte bath surface 426, the barrier-free zone is not critical at that location, which is deeply immersed in the electrolyte bath 401.
  • a multiplicity of hollow bodies 430 are arranged in the collection chamber 427, on the surface of which the acid bound in the hydrogen (electrolyte 402 ) deposits. Thus, only "cleaned” hydrogen 428 passes through the barrier of hollow bodies 430.
  • the arrangement of a cathode 507 and a cathode support bar 521 shown in FIG. 6 comprises a shell 509 which forms a collection chamber 527 above an electrolyte bath surface 526 and is conical beneath the electrolyte bath surface 526.
  • the conically shaped region of the shell 509 forms a funnel 550 that tapers toward the collection chamber 527, which covers large areas of the primary hydrogen bubbles 510 formed by the cathode 507 and conducts them into the collection region 527 of the shell 509.
  • the working conditions in the field of electroplating, in particular in connection with the anodizing aluminum significantly reducing the health risk to personnel working there.

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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)
  • Electrolytic Production Of Metals (AREA)
EP06009037A 2005-05-11 2006-05-02 Dispositif de traitement d'un métal dans un bain électrolytique et procédé de réduction de dégagements d'aérosols Withdrawn EP1722012A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005022500 2005-05-11
DE102005038970A DE102005038970A1 (de) 2005-05-11 2005-08-16 Vorrichtung zum Behandeln eines Metalls in einem Elektrolytbad und Verfahren zum Verringern einer Aerosolabgabe

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EP1722012A1 true EP1722012A1 (fr) 2006-11-15

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EP06009037A Withdrawn EP1722012A1 (fr) 2005-05-11 2006-05-02 Dispositif de traitement d'un métal dans un bain électrolytique et procédé de réduction de dégagements d'aérosols

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DE (1) DE102005038970A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009124410A1 (fr) * 2008-04-10 2009-10-15 Topocrom Systems Ag Procédé de galvanisation
WO2014060333A1 (fr) * 2012-10-15 2014-04-24 Noatzke Verwaltungs GmbH Dispositif d'anodisation et procédé d'anodisation de corps tubulaires

Citations (5)

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Publication number Priority date Publication date Assignee Title
FR973536A (fr) * 1941-09-12 1951-02-12 Procédé de traitement électrolytique de l'aluminium en vue de sa protection, et de sa décoration ou coloration
FR1022112A (fr) * 1949-07-21 1953-02-27 Ciba Geigy Procédé pour la production de revêtements d'oxydes, év??ucllement teints, sur del'aluminium, ou sur ses alliages, par oxydation anodique, et produits conformes à ceux obtenus par ce procédé ou procédé similaires
JPS5741397A (en) * 1980-08-26 1982-03-08 Ebara Yuujiraito Kk Preventing method for mist generation in anodic oxidation treatment of aluminum product
US4668353A (en) * 1984-10-10 1987-05-26 Desom Engineered Systems Limited Method and apparatus for acid mist reduction
US6120658A (en) * 1999-04-23 2000-09-19 Hatch Africa (Pty) Limited Electrode cover for preventing the generation of electrolyte mist

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NL135673C (fr) * 1966-05-16
US3486992A (en) * 1967-02-15 1969-12-30 Cincinnati Milling Machine Co Process for electrolytic oxidation of thallium or cerium salts
US3897320A (en) * 1973-11-01 1975-07-29 Hooker Chemicals Plastics Corp Electrolytic manufacture of chlorates, using a plurality of electrolytic cells
DE2422577C3 (de) * 1974-05-09 1979-10-11 Deutsche Automobilgesellschaft Mbh, 3000 Hannover Wiederaufladbare galvanische Zelle und Verfahren zum Betrieb dieser Zelle
JPH05287586A (ja) * 1992-04-15 1993-11-02 Matsushita Electric Ind Co Ltd 陽極酸化装置
AR007667A1 (es) * 1996-06-28 1999-11-10 Aon Int Inc Metodo para reducir el acido o la sal metalicos que se desarrollan en los banos electroliticos alojados en los depositos electroliticos durante lasoperaciones electroliticas.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR973536A (fr) * 1941-09-12 1951-02-12 Procédé de traitement électrolytique de l'aluminium en vue de sa protection, et de sa décoration ou coloration
FR1022112A (fr) * 1949-07-21 1953-02-27 Ciba Geigy Procédé pour la production de revêtements d'oxydes, év??ucllement teints, sur del'aluminium, ou sur ses alliages, par oxydation anodique, et produits conformes à ceux obtenus par ce procédé ou procédé similaires
JPS5741397A (en) * 1980-08-26 1982-03-08 Ebara Yuujiraito Kk Preventing method for mist generation in anodic oxidation treatment of aluminum product
US4668353A (en) * 1984-10-10 1987-05-26 Desom Engineered Systems Limited Method and apparatus for acid mist reduction
US6120658A (en) * 1999-04-23 2000-09-19 Hatch Africa (Pty) Limited Electrode cover for preventing the generation of electrolyte mist

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 114 (C - 110) 25 June 1982 (1982-06-25) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009124410A1 (fr) * 2008-04-10 2009-10-15 Topocrom Systems Ag Procédé de galvanisation
WO2014060333A1 (fr) * 2012-10-15 2014-04-24 Noatzke Verwaltungs GmbH Dispositif d'anodisation et procédé d'anodisation de corps tubulaires

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