EP0193706B1 - Process and hand-operated instrument for the semi-mechanical zinc plating of sheet surfaces - Google Patents

Process and hand-operated instrument for the semi-mechanical zinc plating of sheet surfaces Download PDF

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Publication number
EP0193706B1
EP0193706B1 EP86100333A EP86100333A EP0193706B1 EP 0193706 B1 EP0193706 B1 EP 0193706B1 EP 86100333 A EP86100333 A EP 86100333A EP 86100333 A EP86100333 A EP 86100333A EP 0193706 B1 EP0193706 B1 EP 0193706B1
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EP
European Patent Office
Prior art keywords
electrolyte
metal
treatment member
tampon
treatment
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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
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EP86100333A
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German (de)
French (fr)
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EP0193706A1 (en
Inventor
Wolfgang Dipl.-Ing. Fh Heck
Karl-Heinz Schaich
Jan Dr. Dipl.-Ing. Adamek
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Dr Ing HCF Porsche AG
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Dr Ing HCF Porsche AG
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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
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/04—Electroplating with moving electrodes
    • C25D5/06—Brush or pad plating
    • 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
    • C25D17/14—Electrodes, e.g. composition, counter electrode for pad-plating

Definitions

  • the invention relates to a device for the semi-mechanical galvanizing of sheet metal surfaces according to the preamble of claim 1.
  • the object of the invention is to provide a hand-held device for post-galvanizing which should be easy to handle and compact in order to be able to carry out post-galvanizing in a simple and quick manner even on shaped metal sheets in a strip production of motor vehicles.
  • the advantages achieved by the invention are essentially to be seen in the fact that the post-galvanizing process can be carried out with an easy-to-use implement, with which the oscillating element works quickly due to its own movement. In addition to the own movement, a free movement of the handheld device is possible.
  • the device must also be used to clean the surface before galvanizing. For this purpose, only the processing element for galvanizing is exchanged for a processing element for cleaning, or two devices with the corresponding processing elements are used.
  • the longitudinal and transverse grooves arranged in the working surface of the processing element preferably extend over the entire surface, so that a uniform delivery of zinc electrolyte to the coating is ensured.
  • a peristaltic pump provided in the feed line enables the zinc electrolyte to be optimally metered into the coating, so that the amount of liquid required for galvanizing is always available.
  • a metering valve that interacts with the pump would also be possible.
  • the procedure is coordinated in such a way that the post-galvanizing layer is flush with the existing zinc layer and is constructed in such a way that further treatment of the sheets is possible by means of stove enamelling. without bubbles or other unevenness on the painted sheet surface.
  • Fig. 1 the structure of the method for galvanizing with a handheld device 1 is shown schematically. It becomes an absorbent cover 2, a so-called tampon, which is held on a processing element 3. Zinc electrolyte supplied and absorbed by the tampon.
  • the processing element 3 can consist of graphite or platinized titanium and forms an anode, the material 5 to be galvanized being designed as a cathode. By touching the anode with the workpiece 5, the circuit 6 is closed and the electrolytic metal deposition is initiated.
  • the process is carried out at a voltage of 11 to 13 V and with a current of 10 to 15 A.
  • the sheet surface is cleaned using an aqueous alkaline solution with a pH of around 13.
  • the zinc electrolyte is based on an alkaline base and has a pH of around 8.
  • a zinc layer with a thickness of 8 to 12 pm is achieved in about 2 to 3 minutes.
  • the average layer thickness produced in this way can be assessed by an ampere-hour counter during application and a corresponding signal is generated after the desired layer thickness has been reached.
  • the hand-held device 1 for carrying out the method essentially consists of the lower processing element 3 and an upper, manageable tool 7, which is detachably connected thereto and into which an oscillating part is integrated.
  • the oscillating part sets the hand-held device in an automatically reciprocating movement on the workpiece 5.
  • the handheld device 1 can also be freely moved in any direction.
  • the zinc electrolyte is supplied to the absorbent coating 2 via bores 8 which open into longitudinal and transverse grooves 9, 10 which are open towards the coating 2.
  • the working surface 11 of the machining element 3 is adapted to the shape of the sheet 5, so that the area of the weld seam 12 with the element 3 is easily accessible.
  • the shape curve shown is only an example; any other shape curve is also conceivable, for which purpose the machining element 3 must then be adapted accordingly.
  • the galvanizing plant essentially comprises a line 13 for the zinc electrolyte, a peristaltic pump 14 and an upstream filter regeneration element 4.
  • the method for galvanizing is carried out in such a way that the ground surfaces around the weld seam 12 are electrically cleaned, the hand-held device 1 likewise having a tampon to which a cleaning solution is fed.
  • the galvanizing is then carried out by moving the hand tool 1 over the ground surfaces with a slight pressure while supplying zinc electrolyte.
  • the coating 2 stampon
  • the pump 14 is switched on via a relay 17 and the electrolyte circuit 13 is started up to the hand-held device 1.
  • the line circuits are shown only schematically. After a deposition process, the ground surface is galvanized and flush with the rest of the zinc layer. This is followed by painting the sheet surface without post-treatment of the zinc layer.

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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 With Molten Metal (AREA)
  • Electrolytic Production Of Metals (AREA)

Description

Die Erfindung bezieht sich auf ein Gerät zum halbmechanischen Verzinken von Blechoberflächen nach dem Oberbegriff des Anspruchs 1.The invention relates to a device for the semi-mechanical galvanizing of sheet metal surfaces according to the preamble of claim 1.

Bei der Herstellung von Kfz-Karosserien ist es erforderlich, während des Fertigungsvorgangs verzinkte Blechformteile durch Schweissen miteinander zu verbinden. Beim Schweissen wird die Zinkschicht abgebaut und die Schweissstellen müssen anschliessend geschliffen werden, wobei die Zinkschicht an den zur Schweissstelle angrenzenden Zonen gleichfalls mit entfernt wird.In the manufacture of motor vehicle bodies, it is necessary to connect galvanized sheet metal parts to one another by welding during the manufacturing process. When welding, the zinc layer is broken down and the welding points must then be ground, the zinc layer on the zones adjacent to the welding point also being removed.

Zum manuellen Verzinken sind aus der DE- PS 934 620 Handgeräte bekannt, mit denen aufgrund der Ausbildung ein Verzinkungsvorgang durch Handbetrieb nur mühsam und relativ langsam durchzuführen ist und ein Einsatz z.B. bei einer Bandfertigung für Kraftfahrzeuge nicht kostengünstig ist.For manual galvanizing are known from DE-PS 934 620 handheld devices with which, due to the design, a galvanizing process by manual operation can only be carried out with difficulty and relatively slowly and can be used e.g. is not inexpensive in a belt production for motor vehicles.

Aus der Entgegenhaltung Metals Handbook 9th Edition: Vol. 5. Surface Cleaning, Finishing, Coating, pp. 292 - 298 (Selective Plating), pp. 246-247 (Zinc Plating), p. 28 (Electrocleaning) ist ein Gerät zum Verzinken von Metalloberflächen bekannt, bei dem entweder die Anode (Tampon) oder das Werkstück einer Relativbewegung unterzogen wird. Dieses Gerät für plane Flächen wird alleinig durch Radkraft hin- und herbewegt, wodurch sich bei einer Umkehr der Bewegungsrichtung Verdickungen der Zinkschicht ergeben. Rotierende Geräte zum Verzinken sind für plane und gewölbte Oberflächen nur ungenügend geeignet.From the Metals Handbook 9th Edition: Vol. 5. Surface Cleaning, Finishing, Coating, pp. 292-298 (Selective Plating), pp. 246-247 (Zinc Plating), p. 28 (electrocleaning), a device for galvanizing metal surfaces is known, in which either the anode (tampon) or the workpiece is subjected to a relative movement. This device for flat surfaces is moved back and forth solely by wheel force, which results in thickening of the zinc layer when the direction of movement is reversed. Rotating devices for galvanizing are only insufficiently suitable for flat and curved surfaces.

Aufgabe der Erfindung ist es, en Handgerät zum Nachverzinken zu schaffen, das einfach handhabbar und kompakt ausgeführt sein soll, um auch auf geformten Blechen bei einer Bandfertigung von Kraftfahrzeugen ein Nachverzinken in einfacher Weise und schnell vornehmen zu können. Ausserdem soll die Verzinkung so aufbringbar sein, dass ein nachfolgendes Einbrennlackieren ohne Vorbehandlung der Oberfläche möglich ist.The object of the invention is to provide a hand-held device for post-galvanizing which should be easy to handle and compact in order to be able to carry out post-galvanizing in a simple and quick manner even on shaped metal sheets in a strip production of motor vehicles. In addition, it should be possible to apply the galvanizing in such a way that subsequent stove enamelling is possible without pretreating the surface.

Die Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Weitere vorteilhafte Merkmale beinhalten die Unteransprüche.The object is achieved by the characterizing features of claim 1. The dependent claims contain further advantageous features.

Die durch die Erfindung erreichten Vorteile sind im wesentlichen darin zu sehen, dass das Nachverzinkungsverfahren mit einem einfach handhabbaren Arbeitsgerät durchzuführen ist, mit dem aufgrund seiner Eigenbewegung durch das Schwingelement schnell gearbeitet wird. Zusätzlich zur Eigenbewegung ist eine freie Bewegung des Handgerätes möglich. Auch ist das Gerät zum Reinigen der Oberfläche vor dem Verzinken zu verwenden. Hierzu wird nur das Bearbeitungselement zum Verzinken gegen ein Bearbeitungselement zum Reinigen ausgewechselt oder es werden zwei Geräte mit den entsprechenden Bearbeitungselementen verwendet.The advantages achieved by the invention are essentially to be seen in the fact that the post-galvanizing process can be carried out with an easy-to-use implement, with which the oscillating element works quickly due to its own movement. In addition to the own movement, a free movement of the handheld device is possible. The device must also be used to clean the surface before galvanizing. For this purpose, only the processing element for galvanizing is exchanged for a processing element for cleaning, or two devices with the corresponding processing elements are used.

Die in der Arbeitsfläche des Bearbeitungselements angeordneten Längs- und Quernuten erstrecken sich vorzugsweise über die gesamte Fläche, so dass eine gleichmässige Abgabe von Zinkelektrolyt an den Überzug gewährleistet ist.The longitudinal and transverse grooves arranged in the working surface of the processing element preferably extend over the entire surface, so that a uniform delivery of zinc electrolyte to the coating is ensured.

Eine in der Zuführungsleitung vorgesehene Peristaltic-Pumpe ermöglicht eine optimal dosierte Abgabe des Zink-Elektrolyts in den Überzug, so dass immer die zum Verzinken erforderliche Flussigkeitsmenge zur Verfügung steht. Möglich wäre auch ein Dosierventil, das mit der Pumpe zusammenwirkt.A peristaltic pump provided in the feed line enables the zinc electrolyte to be optimally metered into the coating, so that the amount of liquid required for galvanizing is always available. A metering valve that interacts with the pump would also be possible.

Die Verfahrensweise ist so abgestimmt, dass sich die Nachverzinkungsschicht an die vorhandene Zinkschicht bündig anschiesst und so aufgebaut ist, dass eine weitere Behandlung der Bleche durch eine Einbrennlackierung möglich ist. ohne dass Blasen oder sonstige Unebenheiten auf der lackierten Blechoberfläche auftreten.The procedure is coordinated in such a way that the post-galvanizing layer is flush with the existing zinc layer and is constructed in such a way that further treatment of the sheets is possible by means of stove enamelling. without bubbles or other unevenness on the painted sheet surface.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and will be described in more detail below.

Es zeigt

  • Fig. 1 eine schematische Darstellung des Verfahrens zum Nachverzinken,
  • Fig. 2 ein Bearbeitungselement des Handgeräts,
  • Fig. 3 eine Ansicht auf die Arbeitsfläche des Bearbeitungselements in Pfeilrichtung, und
  • Fig. 4 einen Schnitt durch ein geschweisstes Karosserieblech im Bereich des Kotflügels mit aufgesetztem Handgerät zum Verzinken.
It shows
  • 1 is a schematic representation of the method for galvanizing,
  • 2 shows a processing element of the hand-held device,
  • Fig. 3 is a view of the working surface of the processing element in the direction of the arrow, and
  • Fig. 4 shows a section through a welded body panel in the area of the fender with a hand-held device for galvanizing.

In Fig. 1 ist der Aufbau des Verfahrens zum Nachverzinken mit einem Handgerät 1 schematisch darstellt. Es wird einem saugfähigen Überzug 2, einem sogenannten Tampon, der auf einem Bearbeitungselement 3 gehalten ist. Zink- Elektrolyt zugeführt und von dem Tampon aufgesogen. Das Bearbeitungselement 3 kann aus Graphit oder platiniertem Titan bestehen und bildet eine Anode, wobei der zu verzinkende Werkstoff 5 als Kathode ausgeführt ist. Durch Berührung der Anode mit dem Werkstück 5 ist der Stromkreis 6 geschlossen und die elektrolytische Metallabscheidung wird eingeleitet.In Fig. 1, the structure of the method for galvanizing with a handheld device 1 is shown schematically. It becomes an absorbent cover 2, a so-called tampon, which is held on a processing element 3. Zinc electrolyte supplied and absorbed by the tampon. The processing element 3 can consist of graphite or platinized titanium and forms an anode, the material 5 to be galvanized being designed as a cathode. By touching the anode with the workpiece 5, the circuit 6 is closed and the electrolytic metal deposition is initiated.

Das Verfahren wird bei einer Spannung von 11 bis 13 V und mit einer Stromstärke von 10 bis 15 A durchgeführt. Vor dem verzinken wird die Blechoberfläche gereinigt, wozu eine wässerige alkalische Lösung mit einem ph-Wert von etwa 13 verwendet wird. Das Zink-Elektrolyt basiert auf alkalischer Basis und hat einen ph-Wert von etwa 8. Die Erzielung einer Zinkschicht in einer Dicke von 8 bis 12 pm erfolgt in ca. 2 bis 3 Minuten. Die so erzeugte durchschnittliche Schichtdicke ist während des Auftragens durch einen Amperestundenzähler beurteilbar und nach Erreichen der gewünschten Schichtdicke wird ein entsprechendes Signal erzeugt.The process is carried out at a voltage of 11 to 13 V and with a current of 10 to 15 A. Before galvanizing, the sheet surface is cleaned using an aqueous alkaline solution with a pH of around 13. The zinc electrolyte is based on an alkaline base and has a pH of around 8. A zinc layer with a thickness of 8 to 12 pm is achieved in about 2 to 3 minutes. The average layer thickness produced in this way can be assessed by an ampere-hour counter during application and a corresponding signal is generated after the desired layer thickness has been reached.

Das Handgerät 1 zur Durchführung des Verfahrens besteht im wesentlichen aus dem unteren Bearbeitungselement 3 und einem mit diesem lösbar verbundenen oberen handhabbaren Werkzeug 7, in das ein Schwingteil intergriert ist. Das Schwingteil versetzt das Handgerät in eine selbsttätig hin- und hergehende Bewegung auf dem Werkstück 5. Zusätzlich zu dieser Schwingbewegung kann das Handgerät 1 auch noch in beliebiger Richtung frei verschoben werden.The hand-held device 1 for carrying out the method essentially consists of the lower processing element 3 and an upper, manageable tool 7, which is detachably connected thereto and into which an oscillating part is integrated. The oscillating part sets the hand-held device in an automatically reciprocating movement on the workpiece 5. In addition to this oscillating movement supply, the handheld device 1 can also be freely moved in any direction.

Die Zuführung des Zink-Elektrolyts zum saugfähigen Überzug 2 erfolgt über Bohrungen 8, die in Längs- und Quernuten 9, 10 einmünden, welche zum Überzug 2 hin offen sind.The zinc electrolyte is supplied to the absorbent coating 2 via bores 8 which open into longitudinal and transverse grooves 9, 10 which are open towards the coating 2.

Wie Fig. 4 näher zeigt, ist die Arbeitsfläche 11 des Bearbeitungselements 3 dem Formverlauf des Bleches 5 angepasst, so dass der Bereich der Schweissnaht 12 mit dem Element 3 gut zugänglich ist. Der dargestellte Formverlauf ist nur beispielshaft, auch jeder andere Formverlauf ist denkbar, wozu das Bearbeitungselement 3 dann entsprechend angepasst sein muss.As FIG. 4 shows in more detail, the working surface 11 of the machining element 3 is adapted to the shape of the sheet 5, so that the area of the weld seam 12 with the element 3 is easily accessible. The shape curve shown is only an example; any other shape curve is also conceivable, for which purpose the machining element 3 must then be adapted accordingly.

Die Anlage zum Verzinken umfasst im wesentlichen eine Leitung 13 für das Zink-Elektrolyt, eine Peristaltic-Pumpe 14 und ein vorgeschaltetes Filter- Regenerations- Element 4.The galvanizing plant essentially comprises a line 13 for the zinc electrolyte, a peristaltic pump 14 and an upstream filter regeneration element 4.

Das Verfahren zum Verzinken wird in der Weise durchgeführt, dass die geschliffenen Flächen um die Schweissnaht 12 herum elektrisch gereinigt werden, wobei das Handgerät 1 ebenfalls einen Tampon aufweist, dem eine Reinigungslösung zugeführt wird. Danach erfolgt das Nachverzinken, indem das Handgerät 1 unter Zuführung von Zink-Elektrolyt mit leichtem Druck über die geschliffenen Flächen geführt wird. Wenn der Überzug 2 (Tampon) in Berührung mit dem zu verzinkenden Werkstück 5 steht, wird die Pumpe 14 über ein Relais 17 eingeschaltet und der Elektrolyt- Kreislauf 13 bis zum Handgerät 1 in Gang gesetzt. In der Zeichnung sind, da es sich um eine an sich bekannte Relais-Schaltung handelt, die Leitungskreise nur schematisch dargestellt. Nach einem Abscheidungsprozess ist die geschliffene Fläche verzinkt und bündig mit der übrigen Zinkschicht. Hiernach erfolgt ohne Nachbehandlung der Zinkschicht eine Lackierung der Blechoberfläche.The method for galvanizing is carried out in such a way that the ground surfaces around the weld seam 12 are electrically cleaned, the hand-held device 1 likewise having a tampon to which a cleaning solution is fed. The galvanizing is then carried out by moving the hand tool 1 over the ground surfaces with a slight pressure while supplying zinc electrolyte. When the coating 2 (tampon) is in contact with the workpiece 5 to be galvanized, the pump 14 is switched on via a relay 17 and the electrolyte circuit 13 is started up to the hand-held device 1. In the drawing, since it is a known relay circuit, the line circuits are shown only schematically. After a deposition process, the ground surface is galvanized and flush with the rest of the zinc layer. This is followed by painting the sheet surface without post-treatment of the zinc layer.

Claims (4)

1. A device for the semi-automatic galvanisation of sheet metal surfaces by the tampon galvanising method, in particular for the re-galvanisation of bodywork sheet metal in a region where the zinc layer has been damaged by treatment, in which the surface of the metal in cleaned in the region of the damage with an aqueous alkaline solution by a tampon, and a zinc electrolyte on an alkaline base is applied by the movement to a metal surface by means of a tampon whose shape is adapted to the treatment area of the device and a zinc layer is produced, characterised in that a treatment member (3) forming an anode is connected with an oscillating element (7) which incites the treatment member to make its own movement on the metal surface and which is provided, on its underside facing the workpiece surface, with lengthwise and crosswise grooves (9, 10) distributed so as to open into the absorbent coating (2) of the underside (11) and being connected with a feed line for electrolyte or for a cleaning solution, the underside being adapted to the shape of the surface of the metal sheet (5) to be galvanised, and the oscillating element (7) being locally freely displaceable on the metal surface (5), as a unit (1) with the treatment member (3), by means of a handle.
2. A device according to Claim 1, characterised in that the treatment member (3) forms a handling unit together with the tool (7), the pump (14), the relay (17) and the collecting tank (16).
3. A device according to one or more of the preceding claims, characterised in that, in a feed line (13) for the electrolyte, a dosing pump (14) is provided which is wired together with a relay (17) which controls the switching on and off of the pump (14) depending on the beginning and end of the galvanising procedure.
4. A device according to Claim 3, characterised in that a collecting tank (16), a filter regeneration element (4), a peristaltic dosing pump (14) and a handset (1) with an oscillating grinding anode (treatment member 3) are arranged in the electrolyte circuit (line 15).
EP86100333A 1985-03-06 1986-01-13 Process and hand-operated instrument for the semi-mechanical zinc plating of sheet surfaces Expired EP0193706B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3507927 1985-03-06
DE19853507927 DE3507927A1 (en) 1985-03-06 1985-03-06 METHOD AND HAND DEVICE FOR SEMI-MECHANICAL GALVANIZING OF SHEET SURFACES

Publications (2)

Publication Number Publication Date
EP0193706A1 EP0193706A1 (en) 1986-09-10
EP0193706B1 true EP0193706B1 (en) 1989-06-14

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EP (1) EP0193706B1 (en)
DE (2) DE3507927A1 (en)

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DE3507927C2 (en) 1989-08-31
EP0193706A1 (en) 1986-09-10
DE3507927A1 (en) 1986-09-11
US4879015A (en) 1989-11-07
DE3663959D1 (en) 1989-07-20

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