EP0998596B1 - Electric dip coating - Google Patents

Electric dip coating Download PDF

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Publication number
EP0998596B1
EP0998596B1 EP98941352A EP98941352A EP0998596B1 EP 0998596 B1 EP0998596 B1 EP 0998596B1 EP 98941352 A EP98941352 A EP 98941352A EP 98941352 A EP98941352 A EP 98941352A EP 0998596 B1 EP0998596 B1 EP 0998596B1
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EP
European Patent Office
Prior art keywords
coating
coated
dip
paint
elements
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98941352A
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German (de)
French (fr)
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EP0998596A2 (en
Inventor
Johannes Dahms
Eberhard Heinemann
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ITC Holding GmbH
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ITC Holding GmbH
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Publication date
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Publication of EP0998596A2 publication Critical patent/EP0998596A2/en
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Publication of EP0998596B1 publication Critical patent/EP0998596B1/en
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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
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/10—Electrodes, e.g. composition, counter electrode
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/22—Servicing or operating apparatus or multistep processes

Definitions

  • the invention is directed to a method for electro-dip coating of electrically conductive elements, such as for example screws, nuts, washers or others Small parts, the elements to be coated in, on or on a support element in one with at least one Anode and cathode provided coating bath positioned are.
  • electrically conductive elements such as for example screws, nuts, washers or others Small parts
  • the electro-dip coating or painting is in different Procedures known, one being common clean the metal support elements after treatment must be an electrically conductive, active metallic Surface is exposed again. This is a series of disadvantages, especially large quantities of electro-dip lacquer to be considered as a valuable substance wasted.
  • the one usually to be carried out with solvent Cleaning is especially when it is opposite encapsulated in the environment, comparatively complex and expensive and moreover time-consuming.
  • the object of the invention is therefore to create a solution, with an electro dip coating with anodes and cathodes or support elements can be carried out after a first shot of electro-dip varnish can be used without previous cleaning and without renewed absorption of electro-dip coating after the following, repeated use.
  • the advantage of the present invention is that Anode and cathode are activated with dip coating in such a way that they are nevertheless conductive for equal and There are alternating currents of different voltages.
  • dip or coating varnishes those with electrically conductive components, e.g. graphite or Metal proportions can be used as the invention also provides.
  • Corrosion protection can also be provided according to the invention be, with such a method in development characterized in that the anodes or cathodes before the Painting or the electro-dip coating and the following Activation of the coating in advance with a corrosion protection, for example a zinc dust paint become.
  • the invention makes it possible to use the anodes or cathodes depending on the type of procedure free in the coating pool to operate, i.e. outside a dialysis cell, nevertheless, the invention alternatively sees its use of such a cell.
  • the Coating at 20-500 V DC and activation with current surges of up to 1,000 V.
  • a drum or a basket can be used for bulk goods be or a frame for hanging with the articles to be coated.
  • a coating tape can also be used, which according to painted and activated the procedure of the invention has been.
  • the support elements for the activation with a very dense pack of electrically conductive objects be provided as this in a further embodiment Invention also provides.
  • FIGS. 1 and 2 in a greatly simplified Representation of a cathodic dip coating device and shows an anodic dip coating device, wherein after the description some paint parameters of the Dip lacquer are reproduced.
  • Fig. 1 is an electrically conductive as a cathode Immersion basket 1 with the one to be coated, shown as balls Well represented 6, with the walls of the pelvis are equipped with anodes 3.
  • a direct current of 20 V over a longer period of time via a control device 5 can have high current surges, of the order of magnitude of 1,000 V, the basket 1 are fed to the Dip coat of paint deposited on the basket surface activate such that they are in subsequent treatment stages remains permanently electrically conductive, i.e. as Can act cathode.
  • an epoxy resin-amine-melamine resin combination is given, which is pigmented and water-dilutable.
  • Some of the ingredients are 1-methoxy-2-propanol, 2-butoxy-ethanol and 2-dimethylamino ethanol. This is a liquid black paint.

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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)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Glass Compositions (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Organic Insulating Materials (AREA)

Abstract

A method for the electro-dipcoating of electrically conductive elements, such as screws, nuts, shims or other hardware includes positioning of the elements, which are to be coated, in, on, or at a supporting element on a coating bath, which is provided with at least one anode and one cathode where on the case of a cathodic electrophoretic enameling, the anode and, in the case of an anodic electrophoretic enameling, the cathode is coated with an enamel, which was baked after the coating process and subsequently activated and/or coated with an electrically conductive enamel, which was subsequently cured at room temperature.

Description

Die Erfindung richtet sich auf ein Verfahren zur Elektro-Tauchbeschichtung von elektrisch leitenden Elementen, wie beispielsweise Schrauben, Muttern, Beilegscheiben oder anderen Kleinteilen, wobei die zu beschichtenden Elemente in, auf oder an einem Tragelement in einem mit wenigstens einer Anode und Kathode versehenen Beschichtungsbad positioniert sind.The invention is directed to a method for electro-dip coating of electrically conductive elements, such as for example screws, nuts, washers or others Small parts, the elements to be coated in, on or on a support element in one with at least one Anode and cathode provided coating bath positioned are.

Die Elektro-Tauchbeschichtung bzw. -lackierung ist in unterschiedlichen Verfahrensweisen bekannt, wobei man häufig die metallischen Tragelemente nach der Behandlung so reinigen muß, daß eine elektrisch leitende, aktive metallische Oberfläche wieder freigelegt wird. Hiermit sind eine Reihe von Nachteilen verbunden, insbesondere werden große Mengen von an sich als Wertstoff zu betrachtendem Elektro-Tauchlack vergeudet. Die in der Regel mit Lösungsmittel durchzuführende Reinigung ist insbesondere dann, wenn sie gegenüber der Umwelt gekapselt durchgeführt wird, vergleichsweise aufwendig und teuer und darüber hinaus zeitaufwendig.The electro-dip coating or painting is in different Procedures known, one being common clean the metal support elements after treatment must be an electrically conductive, active metallic Surface is exposed again. This is a series of disadvantages, especially large quantities of electro-dip lacquer to be considered as a valuable substance wasted. The one usually to be carried out with solvent Cleaning is especially when it is opposite encapsulated in the environment, comparatively complex and expensive and moreover time-consuming.

Aufgabe der Erfindung ist daher die Schaffung einer Lösung, mit der eine Elektro-Tauchbeschichtung mit Anoden und Kathoden bzw. Tragelementen durchgeführt werden kann, die nach einer ersten Aufnahme von Elektro-Tauchlack weiter eingesetzt werden können ohne vorangegangene Reinigung und ohne erneute Aufnahme von Elektro-Tauchlack nach der nachfolgenden, wiederholten Benutzung.The object of the invention is therefore to create a solution, with an electro dip coating with anodes and cathodes or support elements can be carried out after a first shot of electro-dip varnish can be used without previous cleaning and without renewed absorption of electro-dip coating after the following, repeated use.

Mit einem Verfahren der eingangs bezeichneten Art wird diese Aufgabe gemäß der Erfindung dadurch gelöst, daß die Anode bei einer kathodischen Elektro-Tauchlackierung bzw. die Kathode bei einer anodischen Tauchlackierung mit einem Lack beschichtet werden, der nach der Beschichtung eingebrannt und anschließend aktiviert wurde und/oder mit einem elektrisch leitenden Lack beschichtet wurde, der anschließend bei Raumtemperatur aushärtet.This is done with a method of the type described at the beginning Object achieved according to the invention in that the anode with a cathodic electro dip painting or the Cathode for anodic dip painting with a varnish be coated, which is baked after coating and then activated and / or with an electric conductive paint was coated, which then cures at room temperature.

Der Vorteil der vorliegenden Erfindung besteht darin, daß Anode und Kathode mit Tauchlack derart aktiviert werden, daß sie nachfolgend gleichwohl leitfähig für Gleich- und Wechselströme unterschiedlicher Spannungen sind.The advantage of the present invention is that Anode and cathode are activated with dip coating in such a way that they are nevertheless conductive for equal and There are alternating currents of different voltages.

In Ausgestaltung ist vorgesehen, daß die Anode bzw. Kathode und/oder das Tragelement mit einem kathodischen oder anodischen Tauchlack mit einer Spannung so lange beschichtet werden, bis kein Strom mehr fließt, anschließend der Lack eingebrannt oder bei Raumtemperatur ausgehärtet wird und nachfolgend die Beschichtung der Objekte durch Anlegen einer Gleich- oder Wechselspannung aktiviert wird, wobei in weiterer Ausgestaltung vorgesehen sein kann, daß das Tragelement nach der Tauchlackbeschichtung mit zu beschichtenden Objekten bestückt, in den Tauchlack eingebracht und während der Beschichtung der Objekte einigen hohen Stromstößen, insbesondere Gleichstromstößen, zur Aktivierung ausgesetzt wird.In an embodiment it is provided that the anode or cathode and / or the support element with a cathodic or anodic Dip coating coated with a voltage for so long until no more current flows, then the paint is baked or cured at room temperature and subsequently coating the objects by creating a DC or AC voltage is activated, whereby in A further embodiment can be provided that the support element after the dip coating with to be coated Objects, placed in the dip coating and some high current surges during the coating of the objects, in particular DC surges, for activation is exposed.

Vorteilhaft ist es, wenn als Tauch- bzw. Beschichtungslacke solche mit elektrisch leitenden Anteilen, wie z.B. Graphitoder Metall-Anteilen, eingesetzt werden, wie dies die Erfindung ebenfalls vorsieht.It is advantageous if as dip or coating varnishes those with electrically conductive components, e.g. graphite or Metal proportions can be used as the invention also provides.

Ein Korrosionsschutz kann erfindungsgemäß auch vorgesehen sein, wobei sich ein derartiges Verfahren in Ausgestaltung dadurch auszeichnet, daß die Anoden bzw. Kathoden vor der Lackierung bzw. der Elektro-Tauchbeschichtung und der nachfolgenden Aktivierung der Beschichtung vorab mit einem Korrosionsschutz, beispielsweise einer Zink-Staubfarbe, beschichtet werden.Corrosion protection can also be provided according to the invention be, with such a method in development characterized in that the anodes or cathodes before the Painting or the electro-dip coating and the following Activation of the coating in advance with a corrosion protection, for example a zinc dust paint become.

Durch die Erfindung ist es möglich, die Anoden bzw. Kathoden je nach Art der Verfahrensweise frei im Beschichtungsbecken zu betreiben, d.h. außerhalb einer Dialysezelle, gleichwohl sieht die Erfindung alternativ auch den Einsatz einer solchen Zelle vor. The invention makes it possible to use the anodes or cathodes depending on the type of procedure free in the coating pool to operate, i.e. outside a dialysis cell, nevertheless, the invention alternatively sees its use of such a cell.

Neben herkömmlichen bekannten metallischen Anoden bzw. Kathoden und auch metallischen Tragelementen können diese Elemente erfindungsgemäß auch als vor der Elektro-Tauchbeschichtung mit Metallüberzügen versehene Kunststoffelemente ausgebildet sein, die dann im erfindungsgemäßen Verfahren eingesetzt werden.In addition to conventional known metallic anodes or cathodes and metallic support elements can do this Elements according to the invention as before electro-dip coating plastic elements with metal coatings be formed, then in the inventive method be used.

Als besonders zweckmäßig hat es sich herausgestellt, die Beschichtung bei 20-500 V Gleichstrom und die Aktivierung mit Stromstößen von bis zu 1.000 V durchzuführen. Als Tragelemente für Schüttgut kann eine Trommel oder ein Korb eingesetzt werden oder auch ein Gestell zur Behängung mit den zu beschichtenden Artikeln.It turned out to be particularly useful, the Coating at 20-500 V DC and activation with current surges of up to 1,000 V. As supporting elements a drum or a basket can be used for bulk goods be or a frame for hanging with the articles to be coated.

Um eine kontinuierliche Bearbeitung zu ermöglichen, kann auch ein Beschichtungsband eingesetzt werden, welches nach der erfindungsgemäßen Verfahrensweise lackiert und aktiviert wurde.To enable continuous processing, a coating tape can also be used, which according to painted and activated the procedure of the invention has been.

Zweckmäßig können die Tragelemente für die Aktivierung mit einer sehr dichten Packung elektrisch leitender Objekte versehen werden, wie dies in weiterer Ausgestaltung die Erfindung ebenfalls vorsieht.Appropriately, the support elements for the activation with a very dense pack of electrically conductive objects be provided as this in a further embodiment Invention also provides.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aufgrund der nachfolgenden Beschreibung sowie anhand der Zeichnung, die in den Fig. 1 und 2 in stark vereinfachter Darstellung eine kathodische Tauchlack-Einrichtung und eine anodische Tauchlack-Einrichtung zeigt, wobei im Anschluß der Beschreibung einige Lackparameter des Tauchlackes wiedergegeben sind.Further features, details and advantages of the invention result from the following description as well based on the drawing, which is shown in FIGS. 1 and 2 in a greatly simplified Representation of a cathodic dip coating device and shows an anodic dip coating device, wherein after the description some paint parameters of the Dip lacquer are reproduced.

In Fig. 1 ist ein als Kathode geschalteter elektrisch leitender Tauchkorb 1 mit dem als Kugeln dargestellten, zu beschichtenden Gut 6 dargestellt, wobei die Wände des Beckens mit Anoden 3 ausgerüstet sind. Über eine nur angedeutete Gleichstromquelle 4 ist es möglich, z.B. einen Gleichstrom von 20 V über eine längere Zeit anzulegen, über eine Regeleinrichtung 5 können hohe Stromstöße, etwa in der Größenordnung von 1.000 V, dem Korb 1 zugeführt werden, um die auf der Korboberfläche abgeschiedene Tauchlackschicht zu aktivieren, derart, daß sie in nachfolgenden Behandlungsstufen permanent elektrisch leitend verbleibt, d.h. als Kathode fungieren kann. In gleicher Weise können die Anoden 3 beschichtet und die Oberflächen entsprechend aktiviert werden.In Fig. 1 is an electrically conductive as a cathode Immersion basket 1 with the one to be coated, shown as balls Well represented 6, with the walls of the pelvis are equipped with anodes 3. About an implied one DC source 4 it is possible e.g. a direct current of 20 V over a longer period of time, via a control device 5 can have high current surges, of the order of magnitude of 1,000 V, the basket 1 are fed to the Dip coat of paint deposited on the basket surface activate such that they are in subsequent treatment stages remains permanently electrically conductive, i.e. as Can act cathode. In the same way, the anodes 3 coated and the surfaces activated accordingly become.

In Fig. 2 sind bei gleichen sonstigen Gegebenheiten lediglich Anode und Kathode vertauscht, hier soll eine mit "ATL" abgekürzte anodische Tauchlackierung angedeutet sein.2 are only given the same other conditions Anode and cathode interchanged, here one with "ATL" abbreviated anodic dip painting may be indicated.

Als Beispiel für einen hier zur Anwendung kommenden Lack sei eine Epoxidharz-Amin-Melaminharz-Kombination angegeben, die pigmentiert ist und wasserverdünnbar. Einige der Inhaltsstoffe sind dabei 1-Methoxy-2-Propanol, 2-Butoxy-Ethanol und 2-Dimethylamino-Ethanol. Hierbei handelt es sich um einen flüssigen schwarzen Lack.As an example of a lacquer used here an epoxy resin-amine-melamine resin combination is given, which is pigmented and water-dilutable. Some of the ingredients are 1-methoxy-2-propanol, 2-butoxy-ethanol and 2-dimethylamino ethanol. This is a liquid black paint.

Claims (12)

  1. Method for the electrophoretic dip coating of electrically conductive elements, such as bolts, nuts, washers or other small parts, the elements to be coated being positioned in, on or at a supporting element in a processing bath provided with at least one anode and cathode,
    characterised in that
    in the case of cathodic dip painting the anode, or in the case of anodic dip painting the cathode, is coated with a paint which was stoved and then activated following the coating process and/or coated with an electrically conductive paint which is subsequently cured at room temperature.
  2. Method according to claim 1.
    characterised in that
    the anode or cathode and/or the supporting element is/are coated with a cathodic or anodic dip paint with a voltage until the flow of current ceases, following which the paint is stoved or cured at room temperature, the coating of the objects being subsequently activated by the application of a dc or ac voltage.
  3. Method according to claim 1 or 2
    characterised in that
    the supporting element, following the dip coating process, is fitted with objects to be coated, placed in the dip paint and exposed to several high current surges, in particular dc surges, for activation during the coating of the objects.
  4. Method according to any of the preceding claims,
    characterised in that
    paints with electrically conductive components, such as graphite or metal components, are used as dip or coating paints.
  5. Method according to any of the preceding claims,
    characterised in that
    the anodes or cathodes are coated with a corrosion prevention agent, for instance a zinc dust primer, prior to the painting or electrophoretic dip coating process and the subsequent activation of the coating.
  6. Method according to any of the preceding claims,
    characterised in that
    the anodes or cathodes are operated within a dialysis cell or free in the coating tub.
  7. Method according to any of the preceding claims,
    characterised in that
    plastic elements provided with a metal coating are used as anodes or cathodes and/or supporting elements.
  8. Method according to any of the preceding claims,
    characterised in that
    the coating process is performed at 20 - 500 V dc, while the activation is achieved with surges up to 1000 V.
  9. Method according to any of the preceding claims,
    characterised in that
    that a drum or basket is used as supporting elements for loose objects, or a stand is used for hanging up articles to be coated.
  10. Method according to any of the preceding claims,
    characterised in that
    a coating belt subjected to self-coating with paint, stoving and subsequent activation by means of high dc voltage surges is used for continuous processing.
  11. Method according to any of the preceding claims,
    characterised in that
    the supporting elements are densely packed with electrically conductive objects in the dip bath for activation.
  12. Apparatus for the electrophoretic dip coating of electrically conductive elements, such as bolts, nuts, washers or other small parts, the elements to be coated being positioned in, on or at a supporting element in a processing bath provided with at least one anode and cathode, in particular for use in a method according to the preceding claims
    characterised in that
    in the case of cathodic dip painting the anode, or in the case of anodic dip painting the cathode, has been coated with a paint which was stoved and then activated following the coating process, and/or coated with an electrically conductive paint which has subsequently been cured at room temperature.
EP98941352A 1997-07-19 1998-07-16 Electric dip coating Expired - Lifetime EP0998596B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19731101 1997-07-19
DE19731101A DE19731101C1 (en) 1997-07-19 1997-07-19 Electro-dip coating method
PCT/EP1998/004454 WO1999004064A2 (en) 1997-07-19 1998-07-16 Electrophoretic coating

Publications (2)

Publication Number Publication Date
EP0998596A2 EP0998596A2 (en) 2000-05-10
EP0998596B1 true EP0998596B1 (en) 2003-01-15

Family

ID=7836285

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98941352A Expired - Lifetime EP0998596B1 (en) 1997-07-19 1998-07-16 Electric dip coating

Country Status (7)

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US (1) US6554988B1 (en)
EP (1) EP0998596B1 (en)
AT (1) ATE231196T1 (en)
AU (1) AU8976498A (en)
DE (2) DE19731101C1 (en)
ES (1) ES2186209T3 (en)
WO (1) WO1999004064A2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10250471B3 (en) * 2002-10-30 2004-04-01 Lindal Ventil Gmbh Valve plate used for aerosol containers comprises a metal sheet provided with an anticorrosion layer
US20060032730A1 (en) * 2004-08-13 2006-02-16 Kaufman Paul J Belt conveyor apparatus
US20060051511A1 (en) * 2004-08-13 2006-03-09 Orosz Gary R Apparatus and systems for coating objects
US7947160B2 (en) 2004-08-13 2011-05-24 Ppg Industries Ohio, Inc. System for coating objects
US7943028B2 (en) * 2004-08-13 2011-05-17 Ppg Industries Ohio, Inc. Method for coating objects
TWI412629B (en) * 2011-05-23 2013-10-21 Univ Tatung Method and apparatus of electrophoretic deposition

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3879277A (en) * 1973-04-27 1975-04-22 Armco Steel Corp Method and apparatus for electropainting small articles
US4668358A (en) * 1986-05-14 1987-05-26 Motor Wheel Corporation Method and apparatus for use in surface treatment of conveyor supported workholders

Also Published As

Publication number Publication date
AU8976498A (en) 1999-02-10
ES2186209T3 (en) 2003-05-01
US6554988B1 (en) 2003-04-29
WO1999004064A2 (en) 1999-01-28
EP0998596A2 (en) 2000-05-10
DE19731101C1 (en) 1998-08-06
ATE231196T1 (en) 2003-02-15
WO1999004064A3 (en) 1999-05-27
DE59806949D1 (en) 2003-02-20

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