EP2684986B1 - Procédé d'oxydation électrolytique de surfaces sur des corps creux métalliques - Google Patents

Procédé d'oxydation électrolytique de surfaces sur des corps creux métalliques Download PDF

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Publication number
EP2684986B1
EP2684986B1 EP12176185.2A EP12176185A EP2684986B1 EP 2684986 B1 EP2684986 B1 EP 2684986B1 EP 12176185 A EP12176185 A EP 12176185A EP 2684986 B1 EP2684986 B1 EP 2684986B1
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EP
European Patent Office
Prior art keywords
bath
treatment
work piece
treatment bath
rail
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.)
Not-in-force
Application number
EP12176185.2A
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German (de)
English (en)
Other versions
EP2684986A1 (fr
Inventor
Josep Valls Balaguè
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.)
Thomas GmbH
Original Assignee
Thomas GmbH
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 Thomas GmbH filed Critical Thomas GmbH
Priority to EP12176185.2A priority Critical patent/EP2684986B1/fr
Priority to ES12176185.2T priority patent/ES2612687T3/es
Priority to MX2013007968A priority patent/MX346085B/es
Priority to US13/938,328 priority patent/US9382637B2/en
Priority to CN201310291948.2A priority patent/CN103540986B/zh
Priority to ARP130102489 priority patent/AR091754A1/es
Publication of EP2684986A1 publication Critical patent/EP2684986A1/fr
Application granted granted Critical
Publication of EP2684986B1 publication Critical patent/EP2684986B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • 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

Definitions

  • the invention relates to a method for anodizing surfaces on metallic hollow bodies, in which the hollow bodies are fixed in a clamping manner on projecting fingers of electrically conductive workpiece carriers and the workpiece carriers are guided stepwise through a series of treatment baths in a predetermined working cycle, wherein the treatment baths comprise at least one Eloxalbad, in which anodic oxidation takes place on the surfaces of the hollow body through a closed circuit between the workpiece carrier and a cathode arranged in the treatment bath.
  • the hollow bodies are also referred to below as workpieces.
  • Anodizing is also called anodic oxidation and is an electrochemical process that converts the metal surface of a workpiece into metal oxide.
  • the resulting oxide layer is firmly connected to the metallic base material.
  • the layer thickness can be set defined by the choice of process parameters.
  • Anodizing is primarily used for surface finishing of aluminum or aluminum alloy workpieces.
  • the anodized coating permanently protects the aluminum against environmental influences, makes it easy to clean and, thanks to the structure of the oxide layer, allows decorative color entries.
  • the method is used in practice to provide sleeves, caps and similar workpieces with a high quality decorative surface.
  • the treatment baths comprise, in addition to an eloxal bath, further baths in which the workpieces are degreased, chemically treated, rinsed and sealed. Between the treatment baths further rinsing baths are provided.
  • the color effect and gloss effect can be influenced by different immersion times in the different process liquids.
  • workpiece carriers which have been previously loaded with the workpieces to be treated, suspended from a conveyor, transported with vertical alignment and immersed vertically in the process liquids of the treatment baths.
  • the arranged at the lower end of the workpiece carrier workpieces are exposed in this process, the process liquid longer than the fixed at the upper end of the workpiece carrier workpieces.
  • the different dwell time in the anodizing bath and in a downstream dye bath has an adverse effect on the quality of the workpiece surfaces.
  • the anodized and colored surfaces of the workpieces differ, for example, in terms of color intensity, which is highly dependent on the residence time of the workpieces in the dye bath.
  • the workpieces are fixed on an endless belt, which consists of a titanium sheet or a Zirkonblech, which is guided to form belt loops through a plurality of series-arranged treatment baths.
  • the residence time of the workpieces can be varied. Also in this method, a large carryover of the process liquid from treatment bath to treatment bath is unavoidable.
  • the invention has for its object to provide a method for anodizing surfaces of metallic hollow bodies, which is characterized by a low carryover of the process liquids from treatment bath to treatment bath and with which it is possible to workpieces finished with an anodized and in particular colored To produce a surface of high quality.
  • all fixed on a workpiece carrier workpieces should be identical in terms of color intensity and gloss surface and should in particular quality differences between the top and bottom of the anodized hollow body can be avoided.
  • the workpiece carriers are turned in a transfer station of the treatment baths by a rotational movement and lowered by means of this rotational movement or after turning by means of a vertical movement from a first position I above the bath liquid to a second position II within the bath liquid, wherein the workpiece carrier in the second position II are aligned horizontally.
  • the workpiece carriers are supplied within the treatment bath in this horizontal orientation in one or more predetermined by the power stroke steps of a removal station of the treatment bath.
  • the workpiece carriers are raised in the removal station and turned by 180 ° so that liquid drips from the hollow bodies into the treatment bath.
  • the workpiece carriers are moved on a metallic rail, which is connected to the anode of the circuit.
  • the workpiece carriers in the process fluid of the treatment baths are always aligned horizontally.
  • Workpieces that are dyed after anodizing in the dipping process obtain a uniform color intensity, with no differences between the inside and the outside of the hollow body.
  • the workpiece carriers are moved horizontally on a rail system through the treatment baths, with the movement occurring in steps dictated by the working cycle of the process.
  • the required dive time in the process fluids is determined by the number of steps and the stride length.
  • the workpiece carriers are raised and turned by 180 °. Due to the overhead position of the workpiece carriers, process liquid can drip almost completely from the interior of the hollow bodies as well as from the outer surfaces of the workpieces into the treatment bath.
  • a vertical alignment of the workpieces on the workpiece carriers in conjunction with a 180 ° rotation of the workpiece carrier as it is removed from the treatment bath causes a low carryover of the process liquids from treatment bath to treatment bath. This reduces the consumption of chemicals and energy requirements z. B. for pumps and for heating the process fluids. Furthermore, the cost of a sanitation can be reduced.
  • a plurality of workpiece carriers moved in a row are simultaneously guided through a treatment bath, wherein a workpiece carrier is lowered into the treatment bath in the transfer station of the treatment bath, at the same time a workpiece carrier in the Removal station is removed from the treatment bath and at least one other workpiece carrier is moved through the treatment.
  • the workpiece carriers are turned in the transfer station at least one treatment bath by a rotary motion.
  • the workpiece carriers are turned in accordance with an embodiment of the invention in the transfer station at least one treatment bath by a rotary motion and thereby lowered from a first position above the bath liquid of the treatment bath in a second position within the liquid.
  • the turning device is designed and arranged so that only by the rotational movement of the workpiece carrier, both the required stroke movement and the essential for the inventive method turning movement is performed by 180 °.
  • the removal station of the treatment bath can be equipped with a structurally identical turning device, which lifts the workpiece carrier out of the treatment bath by means of a rotary movement through 180 °.
  • a further alternative embodiment of the method according to the invention provides that the workpiece carriers are turned in the transfer station of at least one treatment bath by a rotational movement and lowered after turning from a position above the treatment bath by means of a vertical movement in the bath liquid.
  • the workpiece carriers carry out both a translational movement and a rotational movement.
  • the embodiment has the advantage that all of the workpiece fixed to the workpiece carrier reach the liquid level of the treatment bath at the same time and submerge in the process liquid of the treatment bath.
  • the described embodiment is particularly suitable for treatment baths into consideration, in which the residence time must be set very accurately and it is necessary that all on the Workpiece carrier fixed hollow body have the same residence time in the bathroom.
  • the described embodiment of the transfer station is preferably used for dye baths in which the workpieces with tight tolerances require a defined residence time, for example between 15 and 30 seconds and deviations from the award value affect the color intensity.
  • the workpiece carriers are located within the treatment baths on a rail and are preferably moved by translational movements of a slider.
  • the anode of the electric circuit associated with the eloxal bath is connected to the rail, which bridges a distance between the transfer station and the removal station of the treatment bath.
  • the rail is thus connected to the positive terminal of a DC voltage source, wherein the contact point between the anode and the rail is within the bath liquid. This ensures a good electrical transmission.
  • the electrical contact within the process fluid is more effective and störunan administrater than a contact outside the bath.
  • the cathode for the anodizing process is expediently arranged below the rail electrically connected to the anode.
  • the cathode is disposed on the bottom of the anodizing bath.
  • workpiece carriers which have a base frame and attached to the base frame strips with a plurality of paired elastically deformable fingers for fixing the hollow body.
  • the base frame of the workpiece carriers can be guided on opposite sides in C-shaped rail elements.
  • the C-shaped rail elements can be made of wire elements, so that they can be well bathed by the process liquid and forms no accumulation of liquid in the rail system when replacing the bath liquid.
  • FIG. 1 The system diagram presented shows the process steps of a process for anodizing surfaces on metallic hollow bodies of aluminum or aluminum alloys.
  • Hollow-body-shaped workpieces are fixed in a clamping manner on projecting fingers of electrically conductive workpiece carriers 1 and the workpiece carriers 1 are guided in a predetermined operating step stepwise through a series of treatment baths.
  • the treatment baths comprise in particular an acid bath 2, a bath 3 for neutralizing the workpieces, an eloxal bath 4, a bath 5 for dyeing and a bath 6 for sealing the treated workpiece surface.
  • the workpieces are rinsed, whereby the rinses in the dipping process in treatment baths 7 can be carried out.
  • One of the treatment baths for example the anodizing bath 4, is in Fig. 2 shown schematically.
  • the workpiece carriers 1 are lowered into the treatment bath in a transfer station 8 of the treatment bath and supplied to a removal station 10 of the treatment bath within the process liquid 9 of the treatment bath with a horizontal orientation in one or more steps predetermined by the work cycle.
  • the workpiece carrier 1 'positioned in the removal station 10 is raised and turned by 180 ° so that the liquid drips out of the hollow body-shaped workpieces 11 into the treatment bath.
  • the workpiece carriers 1 are turned in the transfer station 8 of the treatment bath by a rotational movement and thereby lowered from a first position I above the bath liquid of the treatment bath in a second position II within the bath liquid.
  • the projecting fingers 12 of the workpiece carrier 1 are aligned vertically downwards, so that the fingers 11 clamped fixed to the hollow body 11 are open at its upper end and the process liquid can flow into the interior of the hollow body 11 without being affected by gas bubbles , Outside the treatment bath, the projecting fingers 12 of the workpiece carrier 1 are oriented upward, so that the hollow bodies 11 are fixed over the head to the fingers and any liquid from the interior of the hollow body 11 can drain freely.
  • the removal station 10 of the treatment bath has a structurally identical turning device 13.
  • the workpiece carrier 1 ' is both raised to a level above the liquid level of the treatment bath and simultaneously turned by 180 °.
  • the inventive method is characterized by a low carryover of the process liquid from treatment bath to treatment bath. Furthermore, the dwell time of the workpiece 11 fixed to a workpiece carrier is uniform within the process fluid. This results in a very uniform treatment result.
  • the treatment baths for the in Fig. 1 System diagrams shown preferably have the structure described and differ only by their length.
  • the required immersion times in the process liquids are achieved by the working cycle and the length of the treatment bath.
  • an anodic oxidation takes place on the surfaces of the hollow bodies 11 by a closed circuit between workpiece carrier 1 "and a cathode 14 arranged in the treatment bath.
  • the metallic surfaces of the workpieces 11 consisting of aluminum or an aluminum alloy are converted into aluminum oxide 1 ', 1 "are preferably made of titanium and are not attacked by the anodic oxidation.
  • the workpiece carriers 1, 1 ', 1 rest on a rail 15 and are moved by translatory movements of a slide 16.
  • the anode of the electric circuit associated with the anodizing bath 4 is connected to the rail 15, which measures the distance between the transfer station 8 and the extraction station 10.
  • the contact point between the anode and the rail 15 lies within the bath liquid 14.
  • the cathode 14 is arranged below the rail 15 electrically connected to the anode, preferably on the floor of the treatment bath.
  • the workpiece carriers 1, 1 ', 1 a flat base frame 17 and fixed to the base frame 17 strips 18 having a plurality of paired elastically deformable fingers 12 for fixing the hollow body 11.
  • the base frame 17 of the workpiece carrier 1 is on led opposite sides in C-shaped rail elements 20 and also held by C-shaped rail members 20 in overhead movements in the transfer station 8 and the removal station 10 of the treatment bath.
  • the rail elements 20 are made of metal wires and do not form cavities for the process fluid.
  • the Fig. 4 shows a variant of the transfer station.
  • the workpiece carriers are turned with a rotational movement and lowered after turning from a position above the treatment bath by means of a vertical movement in the bath liquid.
  • the movement is composed of a rotational movement through 180 ° and a translatory movement a.
  • the Fig. 4 illustrated transfer station 8 ' has the advantage that all fixed to the workpiece carrier hollow body 11 at the same time reach the process liquid by a translational lowering movement.
  • the Fig. 4 illustrated transfer station 8 ' is preferably used for treatment baths in which all fixed to a workpiece carrier 1 workpieces 11 while maintaining close tolerances require the same residence time.
  • Transfer station shown is therefore used in particular for dye baths in which the previously anodized workpieces 11 are dyed in the dipping process.
  • the dwell time in the dye bath is short and must be set exactly to produce consistent color intensities.

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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)
  • Coating Apparatus (AREA)
  • Chemical Treatment Of Metals (AREA)

Claims (6)

  1. Procédé pour l'anodisation de surfaces sur des corps creux métalliques, dans lequel les corps creux (11) sont fixés par serrage sur des doigts en saillie (19, 19') de supports de pièces (1, 1', 1") électriquement conducteurs, et les supports de pièces (1, 1', 1") sont guidés progressivement selon une cadence prédéfinie à travers une série de bains de traitement, les bains de traitement comprenant au moins un bain d'anodisation (4), dans lequel est réalisée une oxydation anodique sur les surfaces du corps creux (11) à l'aide d'un circuit électrique fermé entre les supports de pièces (1") et une cathode (14) disposée dans le bain de traitement, caractérisé en ce que les supports de pièces (1) sont tournés par un mouvement de rotation dans une station de transfert (8, 8') des bains de traitement, et abaissés à partir d'une première position (I) au-dessus du liquide de bain vers une deuxième position (II) dans le liquide de bain, au moyen de ce mouvement de rotation ou après la rotation au moyen d'un mouvement vertical, les supports de pièces (1) étant orientés horizontalement dans la deuxième position (II), en ce que les supports de pièces (1, 1', 1") situés dans le bain de traitement sont amenés vers une station de retrait (10) du bain de traitement dans cette orientation horizontale, en une ou plusieurs étapes prédéfinies par la cadence, puis relevés et tournés de 180° dans la station de retrait au cours d'une cadence suivante, de sorte que du liquide s'égoutte dans le bain de traitement à partir des corps creux (11), et en ce que les supports de pièces (1, 1', 1") sont déplacés sur un rail métallique dans le bain d'anodisation (4), ledit rail étant relié à l'anode du circuit électrique.
  2. Procédé selon la revendication 1, caractérisé en ce qu'une pluralité de supports de pièces (1, 1', 1") déplacés dans une rangée sont simultanément guidés à travers un bain de traitement, un support de pièce (1) étant abaissé dans le bain de traitement dans la station de transfert (8) du bain de traitement, un support de pièce (1') étant simultanément retiré du bain de traitement dans la station de retrait (10), et au moins un autre support de pièce (1") étant déplacé à travers le bain de traitement.
  3. Procédé selon la revendication 2, caractérisé en ce que les supports de pièces (11) reposent sur un rail (15) dans les bains de traitement et sont déplacés par des mouvements de translation d'un coulisseau (16).
  4. Procédé selon la revendication 3, caractérisé en ce que l'anode du circuit électrique attribué au bain d'anodisation (4) est raccordée à un rail métallique (15) chevauchant un écart entre la station de transfert (8, 8') et la station de retrait (10), le point de contact entre l'anode et le rail (15) étant situé dans le liquide de bain.
  5. Procédé selon la revendication 4, caractérisé en ce que la cathode (14) est disposée dans le bain d'anodisation (4) en dessous du rail (15) électriquement relié à l'anode, de préférence au fond du bain de traitement.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que les supports de pièces (1, 1', 1") utilisés présentent un cadre de base (17) et des baguettes (18) fixées au cadre de base (17), avec une pluralité de doigts (12) élastiquement déformables et disposés par paires pour la fixation du corps creux (11), le cadre de base (17) des supports de pièces étant guidé sur des côtés opposés dans des éléments de rail en forme de C (20).
EP12176185.2A 2012-07-12 2012-07-12 Procédé d'oxydation électrolytique de surfaces sur des corps creux métalliques Not-in-force EP2684986B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP12176185.2A EP2684986B1 (fr) 2012-07-12 2012-07-12 Procédé d'oxydation électrolytique de surfaces sur des corps creux métalliques
ES12176185.2T ES2612687T3 (es) 2012-07-12 2012-07-12 Procedimiento para la anodización de superficies en cuerpos huecos metálicos
MX2013007968A MX346085B (es) 2012-07-12 2013-07-08 Procedimiento para la anolizacion de superficies en cuerpos huecos metalicos.
US13/938,328 US9382637B2 (en) 2012-07-12 2013-07-10 Method of anodizing hollow metallic bodies
CN201310291948.2A CN103540986B (zh) 2012-07-12 2013-07-12 用于对金属空心体上的表面进行阳极化处理的方法
ARP130102489 AR091754A1 (es) 2012-07-12 2013-07-12 Procedimiento para el anodizado de superficies de cuerpos huecos metalicos

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12176185.2A EP2684986B1 (fr) 2012-07-12 2012-07-12 Procédé d'oxydation électrolytique de surfaces sur des corps creux métalliques

Publications (2)

Publication Number Publication Date
EP2684986A1 EP2684986A1 (fr) 2014-01-15
EP2684986B1 true EP2684986B1 (fr) 2016-11-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12176185.2A Not-in-force EP2684986B1 (fr) 2012-07-12 2012-07-12 Procédé d'oxydation électrolytique de surfaces sur des corps creux métalliques

Country Status (6)

Country Link
US (1) US9382637B2 (fr)
EP (1) EP2684986B1 (fr)
CN (1) CN103540986B (fr)
AR (1) AR091754A1 (fr)
ES (1) ES2612687T3 (fr)
MX (1) MX346085B (fr)

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
US10755801B2 (en) 2014-07-11 2020-08-25 Iogenetics, Llc Identifying peptides having T-cell-exposed motifs with known frequency of occurrence in a reference database
US10799582B2 (en) 2014-07-11 2020-10-13 Iogenetics, Llc Immunoglobulin polypeptide fractions from products of domestic animals
DE102014014137A1 (de) * 2014-09-30 2016-03-31 Dürr Systems GmbH Fördersystem für Werkstücke
EP4324478A3 (fr) 2016-03-10 2024-05-15 Iogenetics, LLC. Analogues d'epitopes
CN107523850B (zh) * 2017-09-01 2019-05-03 湖州德耀金属制品有限公司 一种金属制品的表面阳极处理装置
CN110965100A (zh) * 2019-11-29 2020-04-07 中国航发沈阳黎明航空发动机有限责任公司 一种锻造铝合金筒体微弧氧化和硬质阳极化工艺方法
CN110863235B (zh) * 2019-11-30 2021-08-13 安徽国泰铝业有限公司 一种铝合金汽车零部件的表面强化处理装置

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KR100892995B1 (ko) * 2008-10-20 2009-04-10 손치호 금속의 아노다이징 처리 방법 및 그 시스템
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Also Published As

Publication number Publication date
CN103540986B (zh) 2016-03-16
ES2612687T3 (es) 2017-05-18
AR091754A1 (es) 2015-02-25
US20140014523A1 (en) 2014-01-16
CN103540986A (zh) 2014-01-29
MX2013007968A (es) 2014-02-21
MX346085B (es) 2017-03-07
EP2684986A1 (fr) 2014-01-15
US9382637B2 (en) 2016-07-05

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