EP3828317A1 - Frame for galvanizing and method for protecting frames for galvanizing and use of such a frame - Google Patents

Frame for galvanizing and method for protecting frames for galvanizing and use of such a frame Download PDF

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Publication number
EP3828317A1
EP3828317A1 EP20000270.7A EP20000270A EP3828317A1 EP 3828317 A1 EP3828317 A1 EP 3828317A1 EP 20000270 A EP20000270 A EP 20000270A EP 3828317 A1 EP3828317 A1 EP 3828317A1
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EP
European Patent Office
Prior art keywords
protective layer
frame
layer
pvc
marker
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Granted
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EP20000270.7A
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German (de)
French (fr)
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EP3828317B1 (en
EP3828317C0 (en
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Salvatore Bongiorno
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    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/06Suspending or supporting devices for articles to be coated
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B05D5/083Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50Multilayers
    • B05D7/52Two layers
    • B05D7/54No clear coat specified
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/06Suspending or supporting devices for articles to be coated
    • C25D17/08Supporting racks, i.e. not for suspending
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00Processes for applying liquids or other fluent materials
    • B05D1/18Processes for applying liquids or other fluent materials performed by dipping
    • B05D1/22Processes for applying liquids or other fluent materials performed by dipping using fluidised-bed technique
    • B05D1/24Applying particulate materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2451/00Type of carrier, type of coating (Multilayers)
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254After-treatment

Definitions

  • the invention relates to a rack for electroplating and a method for protecting racks for electroplating and a use of such a rack.
  • the invention relates to a frame for electroplating with a base body which is surrounded by a PVC layer.
  • racks are used for the electroplating of plastics and metals and consist of a frame head for attaching the frame made of brass or other materials.
  • a blind frame is provided in the edge area to protect the high current density area and in the bottom area there is insulation, which is usually made of PVC in various colors to protect the metal from acid attack during electroplating.
  • the invention is based on the object of further developing such a frame, to present a method for protecting frames and a use of such frames.
  • the invention is achieved with a frame for electroplating with a base body which is surrounded by a PVC layer, in which a protective layer is applied to the PVC layer.
  • the protective layer prevents the frame from being metallized and thus favors the galvanization of the treated products.
  • the protective layer closes microcracks and pores on the PVC-coated frames that can arise during the manufacture of the frames.
  • the racks according to the invention are particularly suitable for chromium-free pretreatment using alternative oxidizing agents such as.
  • B. Manganese compounds and strong acids In particular, it prevents palladium and other metals such as iridium from the platinum group, which have a catalytic character, from the pretreatment in a still cracked and porous frame insulation made of PVC, which is favored by the aggressive pickling processes during the galvanization of plastics, and in the PVC Insulation is absorbed.
  • the base body is made essentially from metal.
  • the main focus here is the frame, which can be made of aluminum, brass, iron or other metals.
  • the protective layer has a fluorocarbon. Since in fluoropolymers the fluorine atoms with their larger volume are much larger than the hydrogen atoms, they form a dense and protective shell around the carbon chain and thus provide highly effective protection against chemical attack. The very stable bond between the carbon atoms and the fluorine atoms also results in high thermal and chemical stability both at particularly high and at particularly low temperatures.
  • the protective layer have polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) or a modified PTFE (TFM ⁇ ) from Dyneon.
  • PVDF polyvinylidene fluoride
  • PTFE polytetrafluoroethylene
  • TFM ⁇ modified PTFE
  • the chain length of PTFE is shortened by adding a small amount of oxygen, and cross-linking of the molecular chains is also increased. This increases the resilience to compressive and tensile loads.
  • the protective layer can also have perfluoroalkoxy (PFA), which has approximately the same properties as PTFE. The shorter chain length, which is due to the incorporated oxygen atom, results in a lower melt viscosity. Perfluoroalkoxy can therefore be sprayed.
  • PCTFE polytrifluoretylene
  • PFA polyvinylidene fluoride
  • ECTFE Ethylene-chlorotrifluoretylene copolymer
  • a copolymer of ethylene and tetrafluoroethylene (ETFE) enables molded parts to be manufactured using injection molding. Good results have also been achieved with polyether ketones (PEEK) and / or polyoxymethylene (POM).
  • the materials described can be used alternatively or cumulatively, depending on the coating technology.
  • the protective layer is usually transparent. This results in the frame being the color of the PVC layer.
  • the protective layer can, however, also be opaque.
  • a marker be applied to the PVC layer under the protective layer, which should function as an early warning system. As long as this marker can be seen, it is protected by the protective layer. However, if the protective layer has been removed, then first the marker in between and then the PVC layer underneath is attacked during the pickling process. The material of the marker is chosen so that the marker is attacked by the stain used before or when the PVC layer is attacked. If the marker can no longer be seen, then the person skilled in the art knows that the PVC layer is already being attacked or at least is no longer adequately protected by the protective layer, which in turn promotes cracks and porosity in the PVC, with which the frame is used as insulation is coated. It is then time to replace or recoat the frame.
  • the marker is not always visible. It is therefore suggested that the marker be invisible to light in the range between 750 nm and 400 nm. So you can't see the marker in natural light.
  • a special light source such as UV light or IR light with a certain wavelength range
  • a person skilled in the art can tell whether the marker is still visible, has already been removed from the stain or has only been attacked. From this, the person skilled in the art can determine whether the PVC layer has already been attacked or whether the protective layer is still completely intact.
  • the object on which the invention is based is achieved with a method for protecting frames for electroplating, in which a PVC layer is applied to the base body of the frame and a protective layer is applied to the PVC layer.
  • the aforementioned materials are particularly suitable as a protective layer.
  • the protective layer is applied to the PVC layer, which is still soft. This creates a particularly intimate connection between the PVC layer and the protective layer.
  • the protective layer can be applied as a powder.
  • a powder swirling process is particularly suitable here.
  • the protective layer can also be applied in liquid form.
  • the protective layer is burned in.
  • a baking process at temperatures of, for example, 100 ° C to 300 ° C or for PVDF of around 200 ° C is suitable.
  • a marker can be applied between the PVC layer and the protective layer, which is only visible with light in a certain defined wavelength range outside of visible light. This means that the specialist can make the marker visible with a lamp with a special lamp that is matched to the marker, provided that it has not yet been washed off by the stain because the protective layer no longer fulfills its function.
  • Such racks are particularly suitable for electroplating plastics, but they can also be used for standard electroplating in order to increase the service life.
  • the frame 1 shown has a base body 2, which is also referred to as a frame frame and is made of aluminum, brass, iron or other materials.
  • the rack head 3 is located above it, and contacts 4 made of stainless steel are provided on the rack frame for the power transmission of the components for coating.
  • a blind frame 5 is used to protect the area with a high current density and the insulation 6 is usually made of PVC in various colors to protect the metal from acid attack during electroplating.
  • the Figure 1 shows a cross section through the base body 2, which is surrounded by a PVC layer 7.
  • a protective layer 8 made of PVDF is applied around the PVC layer 7.
  • a marker 9 is applied to the PVC layer 7 at least at some points or at a certain point. In the exemplary embodiment, this marker 9 is only visible when a UV light 10 from a UV lamp 11 reaches the marker 9 through the protective layer 8.
  • the chemical agents of the stain can remove the protective layer 8.
  • the PVC layer 7 can then be attacked.
  • the marker 9 applied to the PVC layer 7 can also be attacked.
  • the marker is attacked first when the protective layer 8 no longer fulfills its protective function. As a result, a lack of the marker or an attacked marker indicates that the PVC layer 7 is at least in danger of being attacked and roughened by the pickling process.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)

Abstract

Ein Gestell für die Galvanisierung mit einem Grundkörper, der mit einer PVC-Schicht umgeben ist, weist eine Schutzschicht auf, die auf die PVC-Schicht aufgebracht ist. Dadurch wird die PVC-Schicht geschützt. Vorteilhaft ist es, wenn die Schutzschicht einen Fluorkohlenstoff aufweist und eingebrannt ist.A frame for electroplating with a base body that is surrounded by a PVC layer has a protective layer that is applied to the PVC layer. This will protect the PVC layer. It is advantageous if the protective layer has a fluorocarbon and is burned in.

Description

Die Erfindung betrifft ein Gestell für die Galvanisierung und ein Verfahren zum Schützen von Gestellen für die Galvanisierung sowie eine Verwendung eines derartigen Gestells.The invention relates to a rack for electroplating and a method for protecting racks for electroplating and a use of such a rack.

Insbesondere betrifft die Erfindung ein Gestell für die Galvanisierung mit einem Grundkörper, der mit einer PVC-Schicht umgeben ist. Derartige Gestelle werden für die Galvanisierung von Kunststoffen und Metallen verwendet und bestehen aus einem Gestellkopf zum Anhängen des Gestells aus Messing oder anderen Materialien. Darunter befindet sich ein Gestellrahmen aus Aluminium, Messing, Eisen oder anderen Materialien. Am Gestellrahmen befinden sich Kontakte aus Edelstahl für die Stromübertragung der Bauteile zur Beschichtung. Im Randbereich ist ein Abblendrahmen zum Schutz des hohen Stromdichtebereichs vorgesehen und im Bodenbereich befindet sich eine Isolierung, die meist aus PVC in diversen Farben zum Schutz des Metalls vor Säureangriff beim Galvanisieren hergestellt ist.In particular, the invention relates to a frame for electroplating with a base body which is surrounded by a PVC layer. Such racks are used for the electroplating of plastics and metals and consist of a frame head for attaching the frame made of brass or other materials. Underneath there is a frame made of aluminum, brass, iron or other materials. On the frame there are contacts made of stainless steel for the power transmission of the components for coating. A blind frame is provided in the edge area to protect the high current density area and in the bottom area there is insulation, which is usually made of PVC in various colors to protect the metal from acid attack during electroplating.

Je nach Verwendung unterschiedlicher Beizen oder unterschiedlicher Vorbehandlungsprozesse besteht die Gefahr, dass die Beizen oder katalytisch wirkenden Substanzen in die PVC-Gestellisolierung eindringen. Eine Absorption von Stoffen aus dem Vorbehandlungsprozess im PVC-Überzug des Gestells bindet einerseits notwendige Bestandteile der Beizen am Gestell und kann andererseits die Schutzfunktion des PVC-Überzugs beeinträchtigen.Depending on the use of different stains or different pretreatment processes, there is a risk that the stains or catalytically active substances will penetrate the PVC frame insulation. An absorption of substances from the pretreatment process in the PVC coating of the frame binds the necessary components of the stain to the frame and can impair the protective function of the PVC coating.

Die US 3 592 744 A hat bereits im Jahre 1971 ein derartiges Gestell mit einem PVC-Überzug beschrieben. Parallel dazu gab es im Jahre 1971 den Vorschlag, fluorhaltige thermoplastische Polyolefine als Isolierung zu verwenden. Dies wurde in der DE 19 45 699 A beschrieben.The U.S. 3,592,744 A already described such a frame with a PVC coating in 1971. At the same time, in 1971 there was a proposal to use fluorine-containing thermoplastic polyolefins as insulation. This was done in the DE 19 45 699 A described.

Der Erfindung liegt die Aufgabe zu Grunde, ein derartiges Gestell weiter zu entwickeln, ein Verfahren zum Schützen von Gestellen und eine Verwendung derartiger Gestelle vorzustellen.The invention is based on the object of further developing such a frame, to present a method for protecting frames and a use of such frames.

Vorrichtungsmäßig wird die Erfindung mit einem Gestell für die Galvanisierung mit einem Grundkörper, der mit einer PVC-Schicht umgeben ist, gelöst, bei dem auf die PVC-Schicht eine Schutzschicht aufgebracht ist.In terms of device, the invention is achieved with a frame for electroplating with a base body which is surrounded by a PVC layer, in which a protective layer is applied to the PVC layer.

Dadurch entsteht eine Multilayerisolierung mit einem besonders hydrophoben Charakter. Durch das Verschließen von Mikro-und Makrorissen in der PVC-Schicht wird eine Absorptionssperre für katalytisch wirkende Medien erreicht. Eine Inhibition dient der Vermeidung des Angriffs auf die PVC-Schicht. Dadurch wird vor allem die Beeinträchtigung des Gestells durch neuartige chromfreie Beizen reduziert und eine Metallisierung dieses Gestelles verhindert.This creates a multilayer insulation with a particularly hydrophobic character. By closing micro and macro cracks in the PVC layer, an absorption barrier for catalytically active media is achieved. An inhibition serves to avoid attack on the PVC layer. Above all, this reduces the impairment of the frame caused by new chromium-free stains and prevents the frame from being metallized.

Die Schutzschicht verhindert eine Metallisierung des Gestells und begünstigt somit die Galvanisierung der behandelten Produkte.The protective layer prevents the frame from being metallized and thus favors the galvanization of the treated products.

Die Schutzschicht verschließt Mikrorisse und Poren an den PVC-ummantelten Gestellen, die bei der Fertigung der Gestelle entstehen können. Dadurch eignen sich die erfindungsgemäßen Gestelle vor allem für eine chromfreie Vorbehandlung unter Verwendung von alternativen Oxidationsmitteln wie z. B. Manganverbindungen und starken Säuren. Insbesondere wird verhindert, dass bei der Galvanisierung von Kunststoffen durch die aggressiven Beizprozesse begünstigt Palladium und andere Metalle wie beispielsweise Iridium aus der Platingruppe, die einen katalytischen Charakter aufweisen, von der Vorbehandlung in eine noch rissige und porige Gestellisolierung aus PVC diffundiert und in der PVC-Isolierung absorbiert wird.The protective layer closes microcracks and pores on the PVC-coated frames that can arise during the manufacture of the frames. As a result, the racks according to the invention are particularly suitable for chromium-free pretreatment using alternative oxidizing agents such as. B. Manganese compounds and strong acids. In particular, it prevents palladium and other metals such as iridium from the platinum group, which have a catalytic character, from the pretreatment in a still cracked and porous frame insulation made of PVC, which is favored by the aggressive pickling processes during the galvanization of plastics, and in the PVC Insulation is absorbed.

Vorteilhaft ist es, wenn der Grundkörper im Wesentlichen aus Metall hergestellt ist. Hierbei geht es vor allem um den Gestellrahmen, der aus Aluminium, Messing, Eisen oder anderen Metallen hergestellt werden kann.It is advantageous if the base body is made essentially from metal. The main focus here is the frame, which can be made of aluminum, brass, iron or other metals.

Besonders vorteilhaft ist es, wenn die Schutzschicht einen Fluorkohlenstoff aufweist. Da bei Fluorpolymeren die Fluoratome mit ihrem größeren Volumen gegenüber den Wasserstoffatomen wesentlich größer sind, bilden diese um die Kohlenstoffkette eine dichte und schützende Hülle und bewirken dadurch einen höchst wirksamen Schutz gegen chemische Angriffe. Die sehr stabile Bindung der Kohlenstoffatome mit den Fluoratomen bewirkt zudem eine hohe thermische und chemische Festigkeit sowohl bei besonders hohen als auch bei besonders tiefen Temperaturen.It is particularly advantageous if the protective layer has a fluorocarbon. Since in fluoropolymers the fluorine atoms with their larger volume are much larger than the hydrogen atoms, they form a dense and protective shell around the carbon chain and thus provide highly effective protection against chemical attack. The very stable bond between the carbon atoms and the fluorine atoms also results in high thermal and chemical stability both at particularly high and at particularly low temperatures.

Daher wird vorgeschlagen, dass die Schutzschicht Polyvinylidenfluorid (PVDF), Polytetrafluorethylen (PTFE) oder ein modifiziertes PTFE (TFM©) von Dyneon aufweist. Bei modifiziertem PTFE wird durch eine geringfügige Zuführung von Sauerstoff die Kettenlänge von PTFE verkürzt und auch eine Quervernetzung der Molekülketten vermehrt. Dadurch erhöht sich die Belastbarkeit auf Druck- und Zugbeanspruchungen. Die Schutzschicht kann jedoch auch Perfluor-Alkoxy (PFA) aufweisen, das annähernd die gleichen Eigenschaften wie PTFE aufweist. Durch die kürzere Kettenlänge, die durch das eingelagerte Sauerstoffatom bedingt ist, wird eine niedrigere Schmelzviskosität erzielt. Perfluor-Alkoxy ist daher spritzfähig.It is therefore proposed that the protective layer have polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) or a modified PTFE (TFM © ) from Dyneon. In the case of modified PTFE, the chain length of PTFE is shortened by adding a small amount of oxygen, and cross-linking of the molecular chains is also increased. This increases the resilience to compressive and tensile loads. However, the protective layer can also have perfluoroalkoxy (PFA), which has approximately the same properties as PTFE. The shorter chain length, which is due to the incorporated oxygen atom, results in a lower melt viscosity. Perfluoroalkoxy can therefore be sprayed.

Weiterhin wird Polytrifluoretylen (PCTFE) vorgeschlagen, das ebenfalls spritzfähig ist und eine größere Härte als PTFE und PFA aufweist. Gute Ergebnisse wurden auch mit Polyvinylidenfluorid (PVDF) erzielt. Dieser Teilfluorierter Kohlenstoff besitzt eine sehr gute chemische Beständigkeit. Ethylen-Chlortrifluoretylen-Copolymer (ECTFE) sorgt für eine besonders porendichte und korrosionsbeständige Pulverbeschichtung. Ein Copolymerisat aus Ethylen und Tetrafluoräthylen (ETFE) ermöglicht die Herstellung von Formteilen im Spritzgussverfahren. Gute Ergebnisse wurden auch mit Polyetherketonen (Peek) und/oder Polyoxymethylen (POM) erzielt.Furthermore, polytrifluoretylene (PCTFE) is proposed, which can also be injected and has a greater hardness than PTFE and PFA. Good results have also been achieved with polyvinylidene fluoride (PVDF). This partially fluorinated carbon has very good chemical resistance. Ethylene-chlorotrifluoretylene copolymer (ECTFE) ensures a particularly pore-tight and corrosion-resistant powder coating. A copolymer of ethylene and tetrafluoroethylene (ETFE) enables molded parts to be manufactured using injection molding. Good results have also been achieved with polyether ketones (PEEK) and / or polyoxymethylene (POM).

Die beschriebenen Materialien können je nach Beschichtungstechnik alternativ oder kumulativ eingesetzt werden.The materials described can be used alternatively or cumulatively, depending on the coating technology.

Dabei ist die Schutzschicht in der Regel durchsichtig. Dies führt dazu, dass das Gestell die Farbe der PVC-Schicht hat. Die Schutzschicht kann aber auch undurchsichtig sein.The protective layer is usually transparent. This results in the frame being the color of the PVC layer. The protective layer can, however, also be opaque.

Um zu erkennen, ob die Schutzschicht noch dick genug ist oder bereits verbraucht ist, wird vorgeschlagen, dass auf die PVC-Schicht unter der Schutzschicht ein Marker aufgebracht ist, welcher als Frühwarnsystem funktionieren soll. Solange dieser Marker zu sehen ist, wird er von der Schutzschicht geschützt. Wenn die Schutzschicht aber abgetragen ist, dann wird beim Beizen zunächst der dazwischenliegende Marker und danach die darunter liegende PVC-Schicht angegriffen. Das Material des Markers ist so gewählt, dass der Marker durch die verwendete Beize angegriffen wird, bevor oder wenn die PVC-Schicht angegriffen wird. Wenn nun der Marker nicht mehr zu sehen ist, dann weiß der Fachmann, dass auch bereits die PVC-Schicht angegriffen wird oder zumindest durch die Schutzschicht nicht mehr ausreichend geschützt ist, was wiederum Rissigkeiten und Porosität vom PVC begünstigt, mit dem das Gestell als Isolierung beschichtet ist. Es ist dann an der Zeit, das Gestell auszutauschen oder neu zu beschichten.In order to recognize whether the protective layer is still thick enough or has already been used up, it is proposed that a marker be applied to the PVC layer under the protective layer, which should function as an early warning system. As long as this marker can be seen, it is protected by the protective layer. However, if the protective layer has been removed, then first the marker in between and then the PVC layer underneath is attacked during the pickling process. The material of the marker is chosen so that the marker is attacked by the stain used before or when the PVC layer is attacked. If the marker can no longer be seen, then the person skilled in the art knows that the PVC layer is already being attacked or at least is no longer adequately protected by the protective layer, which in turn promotes cracks and porosity in the PVC, with which the frame is used as insulation is coated. It is then time to replace or recoat the frame.

Vorteilhaft ist es, wenn der Marker nicht immer sichtbar ist. Daher wird vorgeschlagen, dass der Marker bei Licht im Bereich zwischen 750 nm und 400 nm unsichtbar ist. Somit sieht man den Marker bei natürlichem Licht nicht. Wenn das Gestell aber mit einer speziellen Lichtquelle, wie beispielsweise UV-Licht oder IR-Licht mit einem bestimmten Wellenlängenbereich, angestrahlt wird, dann erkennt der Fachmann, ob der Marker noch sichtbar ist, bereits von der Beize entfernt wurde oder nur angegriffen ist. Daraus kann der Fachmann ermitteln, ob die PVC-Schicht bereits angegriffen ist oder die Schutzschicht noch vollständig intakt ist.It is advantageous if the marker is not always visible. It is therefore suggested that the marker be invisible to light in the range between 750 nm and 400 nm. So you can't see the marker in natural light. However, if the frame is illuminated with a special light source, such as UV light or IR light with a certain wavelength range, then a person skilled in the art can tell whether the marker is still visible, has already been removed from the stain or has only been attacked. From this, the person skilled in the art can determine whether the PVC layer has already been attacked or whether the protective layer is still completely intact.

Verfahrensmäßig wird die der Erfindung zugrunde liegende Aufgabe mit einem Verfahren zum Schützen von Gestellen für die Galvanisierung gelöst, bei dem auf den Grundkörper des Gestells eine PVC-Schicht aufgebracht wird und auf die PVC-Schicht eine Schutzschicht aufgebracht wird.In terms of method, the object on which the invention is based is achieved with a method for protecting frames for electroplating, in which a PVC layer is applied to the base body of the frame and a protective layer is applied to the PVC layer.

Als Schutzschicht eignen sich vor allem die zuvor genannten Materialien.The aforementioned materials are particularly suitable as a protective layer.

Besonders vorteilhaft ist es, wenn die Schutzschicht auf die noch weiche PVC-Schicht aufgebracht wird. Dadurch wird eine besonders innige Verbindung zwischen PVC-Schicht und Schutzschicht erreicht.It is particularly advantageous if the protective layer is applied to the PVC layer, which is still soft. This creates a particularly intimate connection between the PVC layer and the protective layer.

Die Schutzschicht kann als Pulver aufgebracht werden. Hierbei eignet sich besonders ein Pulververwirbelungsverfahren. Die Schutzschicht kann jedoch auch flüssig aufgebracht werden.The protective layer can be applied as a powder. A powder swirling process is particularly suitable here. However, the protective layer can also be applied in liquid form.

Besonders vorteilhaft ist es, wenn die Schutzschicht eingebrannt wird. Je nach verwendetem Material eignet sich ein Einbrennvorgang bei Temperaturen von beispielsweise 100 °C bis 300 °C oder bei PVDF von etwa 200 °C.It is particularly advantageous if the protective layer is burned in. Depending on the material used, a baking process at temperatures of, for example, 100 ° C to 300 ° C or for PVDF of around 200 ° C is suitable.

Zur Bestimmung der Qualität der Schutzschicht kann zwischen die PVC-Schicht und die Schutzschicht ein Marker aufgebracht werden, der nur bei einem Licht in einem bestimmten definierten Wellenlängenbereich außerhalb des sichtbaren Lichts sichtbar ist. Dies führt dazu, dass der Fachmann mit einer Lampe mit einer speziellen Leuchte, die auf den Marker abgestimmt ist, den Marker sichtbar machen kann, sofern er noch nicht durch die Beize abgewaschen wurde, weil die Schutzschicht ihre Funktion nicht mehr erfüllt.To determine the quality of the protective layer, a marker can be applied between the PVC layer and the protective layer, which is only visible with light in a certain defined wavelength range outside of visible light. This means that the specialist can make the marker visible with a lamp with a special lamp that is matched to the marker, provided that it has not yet been washed off by the stain because the protective layer no longer fulfills its function.

Derartige Gestelle eignen sich vor allem für die Galvanisierung von Kunststoffen, Sie können aber auch bei der Standardgalvanisierung eingesetzt werden, um die Lebensdauer zu erhöhen.Such racks are particularly suitable for electroplating plastics, but they can also be used for standard electroplating in order to increase the service life.

Ein vorteilhaftes Ausführungsbeispiel ist in der Zeichnung dargestellt und wird im Folgenden näher beschrieben.An advantageous embodiment is shown in the drawing and is described in more detail below.

Es zeigt

Figur 1
einen Querschnitt durch einen Teil eines Gestells und
Figur 2
ein Gestell für die Galvanisierung.
It shows
Figure 1
a cross section through part of a frame and
Figure 2
a rack for electroplating.

Das in Figur 2 gezeigte Gestell 1 hat einen Grundkörper 2, der auch als Gestellrahmen bezeichnet wird und aus Aluminium, Messing, Eisen oder anderen Materialien hergestellt ist. Darüber befindet sich der Gestellkopf 3 und am Gestellrahmen sind Kontakte 4 aus Edelstahl für die Stromübertragung der Bauteile zur Beschichtung vorgesehen. Ein Abblendrahmen 5 dient dem Schutz des Bereichs mit einer hohen Stromdichte und die Isolierung 6 wird meist in diversen Farben aus PVC zum Schutz des Metalls vor Säureangriff beim Galvanisieren hergestellt.This in Figure 2 The frame 1 shown has a base body 2, which is also referred to as a frame frame and is made of aluminum, brass, iron or other materials. The rack head 3 is located above it, and contacts 4 made of stainless steel are provided on the rack frame for the power transmission of the components for coating. A blind frame 5 is used to protect the area with a high current density and the insulation 6 is usually made of PVC in various colors to protect the metal from acid attack during electroplating.

Die Figur 1 zeigt einen Querschnitt durch den Grundkörper 2, der mit einer PVC-Schicht 7 umgeben ist. Um die PVC-Schicht 7 ist eine Schutzschicht 8 aus PVDF aufgebracht. Bevor die Schutzschicht 8 auf die PVC-Schicht 7 aufgebracht wird, wird zumindest an einigen Stellen oder an einer bestimmten Stelle auf die PVC-Schicht 7 ein Marker 9 aufgebracht. Dieser Marker 9 ist im Ausführungsbeispiel nur dann sichtbar, wenn durch die Schutzschicht 8 ein UV-Licht 10 einer UV-Lampe 11 auf den Marker 9 gelangt.The Figure 1 shows a cross section through the base body 2, which is surrounded by a PVC layer 7. A protective layer 8 made of PVDF is applied around the PVC layer 7. Before the protective layer 8 is applied to the PVC layer 7, a marker 9 is applied to the PVC layer 7 at least at some points or at a certain point. In the exemplary embodiment, this marker 9 is only visible when a UV light 10 from a UV lamp 11 reaches the marker 9 through the protective layer 8.

Bei einem längeren Einsatz des Gestells 1 kann durch die chemischen Mittel der Beize die Schutzschicht 8 abgetragen werden. Dann ist die PVC-Schicht 7 angreifbar. In diesem Fall ist aber auch der auf der PVC-Schicht 7 aufgebrachte Marker 9 angreifbar. In der Praxis wird zuerst der Marker angegriffen, wenn die Schutzschicht 8 ihre Schutzfunktion nicht mehr erfüllt. Dadurch verweist ein Fehlen des Markers oder ein angegriffener Marker darauf, dass die PVC-Schicht 7 zumindest in Gefahr ist angegriffen und durch den Beizprozess aufgeraut zu werden.If the frame 1 is used for a longer period of time, the chemical agents of the stain can remove the protective layer 8. The PVC layer 7 can then be attacked. In this case, however, the marker 9 applied to the PVC layer 7 can also be attacked. In practice, the marker is attacked first when the protective layer 8 no longer fulfills its protective function. As a result, a lack of the marker or an attacked marker indicates that the PVC layer 7 is at least in danger of being attacked and roughened by the pickling process.

Claims (15)

Gestell (1) für die Galvanisierung mit einem Grundkörper (2), der mit einer PVC-Schicht (7) umgeben ist, dadurch gekennzeichnet, dass auf die PVC-Schicht (7) eine Schutzschicht (8) aufgebracht ist.Frame (1) for electroplating with a base body (2) which is surrounded by a PVC layer (7), characterized in that a protective layer (8) is applied to the PVC layer (7). Gestell nach Anspruch 1, dadurch gekennzeichnet, dass der Grundkörper (2) im Wesentlichen aus Metall hergestellt ist.Frame according to Claim 1, characterized in that the base body (2) is essentially made of metal. Gestell nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schutzschicht (8) einen Fluorkunststoff aufweist.Frame according to one of the preceding claims, characterized in that the protective layer (8) has a fluoroplastic. Gestell nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schutzschicht (8) Polytetrafluorethylen (PTFE), modifiziertes PTFE (TFM), Perfluor-Alkoxy (PFA), Polytrifluoretylen (PCTFE), Polyvinylidenfluorid (PVDF), Ethylen-Chlortrifluoretylen-Copolymer (ECTFE), ein Copolymerisat aus Ethylen und Tetrafluoräthylen (ETFE), Polyetherketon (Peek) und/oder Polyoxymethylen (POM) aufweist.Frame according to one of the preceding claims, characterized in that the protective layer (8) is polytetrafluoroethylene (PTFE), modified PTFE (TFM), perfluoro-alkoxy (PFA), polytrifluoretylene (PCTFE), polyvinylidene fluoride (PVDF), ethylene-chlorotrifluoretylene copolymer ( ECTFE), a copolymer of ethylene and tetrafluoroethylene (ETFE), polyether ketone (PEEK) and / or polyoxymethylene (POM). Gestell nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Schutzschicht (8) durchsichtig ist.Frame according to one of the preceding claims, characterized in that the protective layer (8) is transparent. Gestell nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass auf die PVC-Schicht (7) unter der Schutzschicht (8) ein Marker (9) aufgebracht ist.Frame according to one of the preceding claims, characterized in that a marker (9) is applied to the PVC layer (7) under the protective layer (8). Gestell nach Anspruch 6, dadurch gekennzeichnet, dass der Marker (9) bei Licht im Bereich zwischen 750 nm und 400 nm unsichtbar ist.Frame according to claim 6, characterized in that the marker (9) is invisible in light in the range between 750 nm and 400 nm. Verfahren zum Schützen von Gestellen für die Galvanisierung, bei dem auf den Grundkörper des Gestells eine PVC-Schicht (7) aufgebracht wird, dadurch gekennzeichnet, dass auf die PVC-Schicht (7) eine Schutzschicht (8) aufgebracht wird.Method for protecting frames for electroplating, in which a PVC layer (7) is applied to the base body of the frame, characterized in that: that a protective layer (8) is applied to the PVC layer (7). Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die Schutzschicht (8) auf die noch weiche PVC-Schicht (7) aufgebracht wird.Method according to Claim 8, characterized in that the protective layer (8) is applied to the PVC layer (7), which is still soft. Verfahren nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass die Schutzschicht (8) als Pulver aufgebracht wird.Method according to Claim 8 or 9, characterized in that the protective layer (8) is applied as a powder. Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass die Schutzschicht (8) in einem Pulververwirbelungsverfahren aufgebracht wird.Method according to claim 10, characterized in that the protective layer (8) is applied in a powder swirling process. Verfahren nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass die Schutzschicht (8) flüssig aufgebracht wird.Method according to Claim 8 or 9, characterized in that the protective layer (8) is applied in liquid form. Verfahren nach einem der Ansprüche 8 bis 12, dadurch gekennzeichnet, dass die Schutzschicht (8) eingebrannt wird.Method according to one of Claims 8 to 12, characterized in that the protective layer (8) is burned in. Verfahren nach einem der Ansprüche 8 bis 13, dadurch gekennzeichnet, dass zwischen die PVC-Schicht (7) und die Schutzschicht (8) ein Marker (9) aufgebracht wird, der nur bei einem Licht in einem bestimmten definierten Wellenlängenbereich außerhalb des sichtbaren Lichts sichtbar ist.Method according to one of Claims 8 to 13, characterized in that a marker (9) is applied between the PVC layer (7) and the protective layer (8) which is only visible with light in a certain defined wavelength range outside of visible light is. Verwendung des Gestells (1) nach einem der Ansprüche 1 bis 7 zur Galvanisierung von Kunststoffen.Use of the frame (1) according to one of Claims 1 to 7 for electroplating plastics.
EP20000270.7A 2019-11-26 2020-07-31 Use of a rack for electrodeposition on plastics Active EP3828317B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019008181.1A DE102019008181A1 (en) 2019-11-26 2019-11-26 Rack for electroplating and method for protecting racks for electroplating and use of such a rack

Publications (3)

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EP3828317A1 true EP3828317A1 (en) 2021-06-02
EP3828317B1 EP3828317B1 (en) 2023-12-06
EP3828317C0 EP3828317C0 (en) 2023-12-06

Family

ID=71994275

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DE (1) DE102019008181A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1945699A1 (en) 1969-09-10 1971-04-08 Bayer Ag Use of fluorine-containing thermoplastic polyolefins as insulation in chemical metal deposition
US3592744A (en) 1968-12-02 1971-07-13 Macdermid Inc Method of preventing rack plating in continuous plating cycle for nonconductive articles
JPH0610197A (en) * 1992-04-30 1994-01-18 Rohm Co Ltd Plating jig
EP3009528A1 (en) * 2014-10-13 2016-04-20 Rohm and Haas Electronic Materials LLC Metallization inhibitors for plastisol coated plating tools

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6187899A (en) * 1984-10-05 1986-05-06 Daikin Ind Ltd Plating jig

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3592744A (en) 1968-12-02 1971-07-13 Macdermid Inc Method of preventing rack plating in continuous plating cycle for nonconductive articles
DE1945699A1 (en) 1969-09-10 1971-04-08 Bayer Ag Use of fluorine-containing thermoplastic polyolefins as insulation in chemical metal deposition
JPH0610197A (en) * 1992-04-30 1994-01-18 Rohm Co Ltd Plating jig
EP3009528A1 (en) * 2014-10-13 2016-04-20 Rohm and Haas Electronic Materials LLC Metallization inhibitors for plastisol coated plating tools

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EP3828317B1 (en) 2023-12-06
DE102019008181A1 (en) 2021-05-27
EP3828317C0 (en) 2023-12-06

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