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EP2188415B1 - Process for the surface treatment of aluminium and a layerwise construction of an aluminium component having an electric contact - Google Patents

Process for the surface treatment of aluminium and a layerwise construction of an aluminium component having an electric contact Download PDF

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Publication number
EP2188415B1
EP2188415B1 EP08773923.1A EP08773923A EP2188415B1 EP 2188415 B1 EP2188415 B1 EP 2188415B1 EP 08773923 A EP08773923 A EP 08773923A EP 2188415 B1 EP2188415 B1 EP 2188415B1
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EP
European Patent Office
Prior art keywords
component
component part
aluminium
contact
electrical
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.)
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EP08773923.1A
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German (de)
French (fr)
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EP2188415A1 (en
Inventor
Hans-Wilhelm Wehling
Stefan Robert MÜLLER
Dietmar Gruedl
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Valeo Schalter und Sensoren GmbH
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Valeo Schalter und Sensoren GmbH
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/78—Pretreatment of the material to be coated
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
    • G10K9/22—Mountings; Casings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49204—Contact or terminal manufacturing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49204—Contact or terminal manufacturing
    • Y10T29/49208—Contact or terminal manufacturing by assembling plural parts
    • Y10T29/4921—Contact or terminal manufacturing by assembling plural parts with bonding
    • Y10T29/49211—Contact or terminal manufacturing by assembling plural parts with bonding of fused material
    • Y10T29/49213—Metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49204—Contact or terminal manufacturing
    • Y10T29/49208—Contact or terminal manufacturing by assembling plural parts
    • Y10T29/49222—Contact or terminal manufacturing by assembling plural parts forming array of contacts or terminals

Definitions

  • the invention relates to a method for surface treatment of aluminum and a layer structure of a component made of aluminum, for example for contacting a ultrasonic transducer, according to the generic features of the independent claims 1, 6 and 10.
  • ultrasonic transducers with milled or deep-drawn aluminum geometries, in which an electrical contact, in particular a ground contact, the aluminum geometries to the electrical components, such as ultrasonic transducer, must be made, for example, to achieve a reduction in EMC sensitivity .
  • an electrical contact in particular a ground contact
  • the aluminum geometries to the electrical components, such as ultrasonic transducer must be made, for example, to achieve a reduction in EMC sensitivity
  • EMC sensitivity electrostatic pressure
  • the automotive technology utraschallbasierende for example from the DE 102 37 721 A1 known environment detection systems with at least one ultrasonic sensor applied, each ultrasonic sensor emits an ultrasonic signal, which is reflected by a possible obstacle and can be received by the same ultrasonic sensor and or by other ultrasonic sensors.
  • the ultrasonic signal is generated by means of a glued on the inside of the aluminum geometry piezoceramic as an electrical component.
  • the piezokoramik is usually glued to the non teltende Aluminiumoxyd Anlagen the aluminum geometry by means of a non-conductive adhesive, with a Oxide layer on the surface of the aluminum in the short term after a surface cleaning process, for example, etching or mechanical machining, repeatedly forms.
  • solders for the necessary production of electrical connections on aluminum, but they have to be soldered with a lot of corrosive flux, which in turn has to be removed by washing. The then necessary cleaning and drying is difficult to handle in an automated production line.
  • the aluminum solder is only available as a solder wire and would possibly produce too much solder and thus too much inert mass.
  • From the DE 43 17 217 A1 is a method for the pretreatment of aluminum parts known to be welded or glued or provided with a conversion layer and a paint.
  • the oxide layer on the aluminum part is first removed with an acidic or alkaline solution.
  • the surface is treated with a Ti or Zr-containing solution to form a conversion layer.
  • this conversion layer keeps the surface electrical resistance low.
  • the invention is based on a method for producing an electrical contacting in which according to the invention advantageously in a first step, an oxide layer on the aluminum surface is removed and in a second step before a new formation of an oxide layer, the surface is sealed with a conversion layer with built-in metal ions ,
  • the removal of the oxide layer can be easily accomplished by etching and sealing the surface by a wet chemical route with zirconium or titanium metal ions.
  • a lacquer or a comparable insulation or corrosion protection medium can also be applied in a further coating step on the sealed surface.
  • the layer structure produced by the method described above on the surface of the aluminum can thus be used in a simple manner for an electrical contacting of a component.
  • the component is a piezoceramic component whose ground contact is then electrically contacted with the surface of the component made of aluminum.
  • the component has a hollow cylindrical, for example, milled or deep-drawn internal geometry with a membrane as a conclusion, on the inside of an ultrasonic transducer as an electrical component to produce an electrical ground contact can be mechanically fixed to the membrane.
  • a component may for example be a component of an ultrasonic sensor for an environment detection system mentioned in the introduction to the description in a parking assistance system in a motor vehicle.
  • the production of an electrically conductive coating with simultaneous removal of the oxide layer on aluminum is inexpensive and easily reproducible.
  • the surface thus produced allows permanent bonding with an adhesive, conductive adhesive or simple soldering.
  • the coating according to the invention can be applied inside and outside, for example, on the membrane. Inside as an electrically conductive surface, as well as corrosion protection and surface for mechanically strong bonding and on the outside as corrosion protection as well as a substrate for painting.
  • FIG. 1 Fig. 12 is a sectional view of an aluminum member for forming a diaphragm 1 for an ultrasonic transducer provided with a conversion layer 2 having the inner surface 2a and the outer surface 2b, which conducts conductivity on the inside and at the same time provides anticorrosive and adhesive property improvement preventing formation of new oxidation layers and externally providing corrosion protection with an improvement in the adhesion of a paint layer.
  • the conversion layer 2, or 2a, 2b is formed here in that in a first step, an oxide layer on the aluminum surface of the membrane 1 is removed and in a second step before a new formation of an oxide layer, the surface of the membrane 1 with the conversion layer 2, or 2a, 2b, is sealed with incorporated metal ions of zirconium or titanium.
  • the removal of the oxide layer in the first step can be done easily by etching and the sealing of the surface can be carried out in a wet-chemical way with the metal ions.
  • FIG. 2 It is shown how in the interior of the membrane 1, a piezoceramic component as an ultrasonic transducer 3 by means of a conductive adhesive 4 as a ground contact on the membrane 1 is electrically conductively joined.
  • the outer contacting of the ultrasonic transducer 3 is carried out with a contact 5 for the ground connection and a contact 6 for the other potential.
  • the ground connection takes place via a conductive surface 7 drawn around via the ultrasound transducer 3, for example with the conductive adhesive 4.
  • FIG. 3 shows an alternative of the ground connection of the ultrasonic transducer 3 to the membrane 1 via a Leitkleberraupe 8, which is guided laterally from the conductive surface of the membrane 1 to the ground contact 5 via a conductive ground surface 9 on the ultrasonic transducer 3.
  • FIG. 4 For this purpose, a cross section can be seen, which is provided with the same reference numerals.
  • FIG. 5 is still shown an alternative electrical connection of the electrically contacted on the membrane 1 ultrasonic transducer 3, in which a Lötstütztician 10 is disposed on the inner surface of the membrane 1, which contacted the ground potential of the on the inner surface of the membrane 1 electrically via the conductive adhesive 4 Ultrasonic transducer 3 is connected and then a contact with the contact 5 can be achieved.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Verfahren zur Oberflächenbehandlung von Aluminium und ein Schichtaufbau eines Bauteils aus Aluminium, beispielsweise für eine Kontaktierung eines Ultraschallwandlers, nach den gattungsgemäßen Merkmalen der nebengeordneten Ansprüche 1, 6 und 10.The invention relates to a method for surface treatment of aluminum and a layer structure of a component made of aluminum, for example for contacting a ultrasonic transducer, according to the generic features of the independent claims 1, 6 and 10.

Beispielsweise werden solche Bauteile mit Membranen für Ultraschallwandler mit gefrästen oder tiefgezogenenen Aluminiumgeometrien verbaut, bei denen ein elektrischer Kontakt, insbesondere ein Massekontakt, der Aluminiumgeometrien zu den elektrischen Bauelementen, wie z.B. Ultraschallwandler, hergestellt werden muss, beispielsweise um eine Reduzierung der EMV-Empfindlichkeit zu erreichen. Es werden in der Kraftfahrzeugtechnik utraschallbasierende, zum Beispiel aus der DE 102 37 721 A1 bekannte Umfelderkennungssysteme mit mindestens einem Ultraschallsensor angewendet, wobei jeder Ultraschallsensor ein Ultraschallsignal aussendet, welches von einem möglichen Hindernis reflektiert wird und von dem gleichen Ultraschallsensor und oder von weiteren Ultraschallsensoren empfangen werden kann.For example, such components are fitted with membranes for ultrasonic transducers with milled or deep-drawn aluminum geometries, in which an electrical contact, in particular a ground contact, the aluminum geometries to the electrical components, such as ultrasonic transducer, must be made, for example, to achieve a reduction in EMC sensitivity , There are in the automotive technology utraschallbasierende, for example from the DE 102 37 721 A1 known environment detection systems with at least one ultrasonic sensor applied, each ultrasonic sensor emits an ultrasonic signal, which is reflected by a possible obstacle and can be received by the same ultrasonic sensor and or by other ultrasonic sensors.

Hierbei wird das Ultraschallsignal mittels einer auf der Innenseite der Aluminiumgeometrie aufgeklebten Piezokeramik als elektrisches Bauelement erzeugt. Die Piezokoramik wird dabei in der Regel auf die nichtteltende Aluminiumoxydschicht der Aluminiumgeometrie mittels eines nichtleitenden Klebers aufgeklebt, wobei sich eine Oxidschicht auf der Oberfläche des Aluminiums kurzfristig nach einem Oberflächenreinigungsverfahren, zum Beispiel ätzen oder mechanisch bearbeiten, immer wieder bildet.Here, the ultrasonic signal is generated by means of a glued on the inside of the aluminum geometry piezoceramic as an electrical component. The piezokoramik is usually glued to the non teltende Aluminiumoxydschicht the aluminum geometry by means of a non-conductive adhesive, with a Oxide layer on the surface of the aluminum in the short term after a surface cleaning process, for example, etching or mechanical machining, repeatedly forms.

Es gibt für die notwendige Herstellung elektrischer Verbindungen auf Aluminium spezielle Lote, die aber mit viel ätzendem Flussmittel gelötet werden müssen, welches wiederum durch Waschen entfernt werden muss. Das dann notwendige Reinigen und Trocknen ist aber in einer automatisierten Fertigungsstraße schlecht zu handhaben. Außerdem stellt die Lötstelle auf dem schwingungstechnisch sensiblen Membranboden des Ultraschallwandlers, auf dem nur kleine Lotmengen zulässig sind, eine kritische Größe dar, um die Funktion des Ultraschallwandlers nicht zu beeinträchtigen. Das Aluminiumlot gibt es nur als Lotdraht und würde eventuell eine zu große Lotmenge und damit eine zu große träge Masse erzeugen.There are special solders for the necessary production of electrical connections on aluminum, but they have to be soldered with a lot of corrosive flux, which in turn has to be removed by washing. The then necessary cleaning and drying is difficult to handle in an automated production line. In addition, the solder joint on the vibration sensitive sensitive membrane bottom of the ultrasonic transducer, on which only small amounts of solder are allowed, a critical size, so as not to affect the function of the ultrasonic transducer. The aluminum solder is only available as a solder wire and would possibly produce too much solder and thus too much inert mass.

Die bisher üblichen Verfahren zur Masseanbindung solcher Bauelemente weisen eine Reihe von Nachteilen auf. Zum Beispiel durch hohe Lotmengen oder auch durch Temperaturen beim Anlöten einer Litze mit Aluminiumlot an der Membran bzw. beim Widerstandsschweißen oder durch mechanische Beeinträchtigungen beim Verstemmen einer Litze an der Membran, beim Einpressen eines Stiftes in die Membran oder beim Bonden einer Litze an der Membran.The usual methods for ground connection of such components have a number of disadvantages. For example, by high Lotmengen or by temperatures when soldering a strand with aluminum solder on the membrane or resistance welding or by mechanical impairments when caulking a stranded wire to the membrane, when pressing a pin in the membrane or when bonding a strand to the membrane.

Aus der DE 43 17 217 A1 ist ein Verfahren zur Vorbehandlung von Aluminiumteilen bekannt, die verschweißt verklebt oder mit einer Konversionsschicht sowie einem Lack versehen werden sollen. Die Oxidschicht auf dem Aluminiumteil wird zuerst mit einer sauren oder alkalischen Lösung entfernt. Unmittelbar danach wird die Oberfläche mit einer Ti- oder Zr-haltigen Lösung behandelt, um eine Konversionsschicht zu erzeugen. Diese Konversionsschicht hält unter anderem den elektrischen Oberflächenwiderstand niedrig.From the DE 43 17 217 A1 is a method for the pretreatment of aluminum parts known to be welded or glued or provided with a conversion layer and a paint. The oxide layer on the aluminum part is first removed with an acidic or alkaline solution. Immediately thereafter, the surface is treated with a Ti or Zr-containing solution to form a conversion layer. Among other things, this conversion layer keeps the surface electrical resistance low.

Aus der JP 2007-60340 A ist bereits ein Verfahren zur Herstellung einer Kontaktierung eines piezokeramischen Bauelements auf einem Ultraschallwandler bekannt, bei dem das piezokeramische Baueelement auf die Aluminiumoberfläche des Ultraschallwandlers aufgeklebt wird. Dabei wird die Aluminiumoberfläche durch Ätzen und Laserreinigung auf den Klebeschritt vorbereitetFrom the JP 2007-60340 A A method for producing a contacting of a piezoceramic component on an ultrasound transducer is already known, in which the piezoceramic component is adhered to the aluminum surface of the ultrasound transducer. The aluminum surface is prepared by etching and laser cleaning on the bonding step

Darstellung der ErfindungPresentation of the invention

Die Erfindung geht von einem Verfahren zur Herstellung einer elektrischen Kontaktierung aus, bei dem erfindungsgemäß in vorteilhafter Weise in einem ersten Schritt eine Oxydschicht auf der Aluminiumoberfläche entfernt wird und in einem zweiten Schritt vor einer Neubildung einer Oxydschicht die Oberfläche mit einer Konversionsschicht mit eingebauten Metallionen versiegelt wird. Die Entfernung der Oxydschicht kann auf einfache Weise durch Ätzen und die Versiegelung der Oberfläche auf nasschemischen Weg mit Metallionen aus Zirkonium oder Titan erfolgen.The invention is based on a method for producing an electrical contacting in which according to the invention advantageously in a first step, an oxide layer on the aluminum surface is removed and in a second step before a new formation of an oxide layer, the surface is sealed with a conversion layer with built-in metal ions , The removal of the oxide layer can be easily accomplished by etching and sealing the surface by a wet chemical route with zirconium or titanium metal ions.

Ergänzend zu den heutigen üblichen Oberflächenvorbereitungsverfahren zum Entfetten, Ätzen oder Dekapieren, beispielsweise um das Lackieren der Aluminiumberfläche vorzubereiten, wird erfindungsgemäß mittels der in Flüssigkeit gelösten Metallionen, wie Titan oder Zirkonium, eine leitende Metallschicht auf dem gereinigten Aluminium angereichert, die zugleich auch mit Sauerstoff schlecht reagiert und das erneute Ausbilden einer Oxydschicht verhindert.In addition to today's conventional surface preparation processes for degreasing, etching or pickling, for example, to prepare the painting of the aluminum surface is enriched according to the invention by means of dissolved in liquid metal ions, such as titanium or zirconium, a conductive metal layer on the cleaned aluminum, which at the same time bad with oxygen reacts and prevents the reformation of an oxide layer.

Auf der versiegelten und leitfähigen Oberfläche sind dann in an sich bekannter Weise mittels eines Leitklebers elektrische Bauelemente kontaktierbar. Andererseits kann aber auch auf der versiegelten Oberfläche ein Lack oder ein vergleichbares Isolations- oder Korrosionsschutzmedium in einem weiteren Beschichtungsschritt aufgebracht werden.On the sealed and conductive surface electrical components can then be contacted in a conventional manner by means of a conductive adhesive. On the other hand, however, a lacquer or a comparable insulation or corrosion protection medium can also be applied in a further coating step on the sealed surface.

Bei einem erfindungsgemäßen Bauteil aus Aluminium kann der mit dem vorhergehend beschriebenen Verfahren hergestellte Schichtaufbau auf der Oberfläche des Aluminiums somit auf einfache Weise zu einer elektrischen Kontaktierung eines Bauelements verwendet werden.In the case of an aluminum component according to the invention, the layer structure produced by the method described above on the surface of the aluminum can thus be used in a simple manner for an electrical contacting of a component.

Das Bauelement ist ein piezokeramisches Bauelement, dessen Massekontakt dann mit der Oberfläche des Bauteils aus Aluminium elektrisch kontaktiert ist. Vorzugsweise weist gemäß einer besonders vorteilhaften Ausführungsform das Bauteil eine hohlzylindrische, beispielsweise gefräste oder tiefgezogene Innengeometrie mit einer Membran als Abschluss auf, auf die innen ein Ultraschallwandler als elektrisches Bauelement unter Herstellung eines elektrischen Massekontaktes zur Membran mechanisch fest aufgebracht werden kann. Ein solches Bauteil kann zum Beispeil ein Bestandteil eines Ultraschallsensors für ein in der Beschreibungseinleitung erwähntes Umfelderkennungssystem bei einem Parkassistenzsystem in einem Kraftfahrzeug sein.The component is a piezoceramic component whose ground contact is then electrically contacted with the surface of the component made of aluminum. Preferably, according to a particularly advantageous embodiment, the component has a hollow cylindrical, for example, milled or deep-drawn internal geometry with a membrane as a conclusion, on the inside of an ultrasonic transducer as an electrical component to produce an electrical ground contact can be mechanically fixed to the membrane. Such a component may for example be a component of an ultrasonic sensor for an environment detection system mentioned in the introduction to the description in a parking assistance system in a motor vehicle.

Gemäß der Erfindung ist somit die Herstellung einer elektrisch leitenden Beschichtung mit gleichzeitigem Abtrag der Oxydschicht auf Aluminium kostengünstig und leicht reproduzierbar. Die so hergestellte Oberfläche ermöglicht eine dauerhafte Klebung mit einem Kleber, Leitkleber oder einfaches Löten. Es sind keine zusätzlichen Fertigungsschritte in der Endmontage notwendig, wobei die erfindungsgemäße Beschichtung innen wie außen beispielsweise auf der Membran aufgebracht werden kann. Innen als elektrisch leitende Fläche, sowie als Korrosionsschutz und Oberfläche zum mechanisch festen Verkleben und außen als Korrosionsschutz sowie als Untergrund für eine Lackierung.According to the invention, therefore, the production of an electrically conductive coating with simultaneous removal of the oxide layer on aluminum is inexpensive and easily reproducible. The surface thus produced allows permanent bonding with an adhesive, conductive adhesive or simple soldering. There are no additional manufacturing steps in the final assembly necessary, the coating according to the invention can be applied inside and outside, for example, on the membrane. Inside as an electrically conductive surface, as well as corrosion protection and surface for mechanically strong bonding and on the outside as corrosion protection as well as a substrate for painting.

Kurze Beschreibung der ZeichnungShort description of the drawing

Ausführungsbeispiel der Erfindung werden anhand der Figuren der Zeichnung erläutert. Es zeigen:

  • Figur 1 einen Schnitt durch ein Bauteil aus Aluminium zur Bildung einer Membran für einen Ultraschallwandler, das mit dem erfindungsgemäßen Verfahren behandelt worden ist,
  • Figur 2 einen Schnitt durch ein Bauteil nach der Figur 1 mit einem elektrisch kontaktierten piezokeramischen Bauelement, hier ein Ultraschallwandler,
  • Figur 3 einen Schnitt durch ein Bauteil nach der Figur 1 mit einem über eine Leitkleberraupe elektrisch kontaktierten piezokeramischen Ultraschallwandler,
  • Figur 4 einen Querschnitt durch das Bauteil nach der Figur 3 und
  • Figur 5 einen Schnitt durch ein Bauteil nach der Figur 1 mit einem über eine Verbindung auf der inneren Membranfläche elektrisch kontaktierten piezokeramischen Ultraschallwandler.
Embodiment of the invention will be explained with reference to the figures of the drawing. Show it:
  • FIG. 1 a section through an aluminum member to form a membrane for an ultrasonic transducer, which has been treated by the method according to the invention,
  • FIG. 2 a section through a component after the FIG. 1 with an electrically contacted piezoceramic component, here an ultrasonic transducer,
  • FIG. 3 a section through a component after the FIG. 1 with a piezoceramic ultrasonic transducer electrically contacted via a conductive adhesive bead,
  • FIG. 4 a cross section through the component after the FIG. 3 and
  • FIG. 5 a section through a component after the FIG. 1 with a piezoceramic ultrasonic transducer electrically contacted via a connection on the inner membrane surface.

Wege zur Ausführung der ErfindungWays to carry out the invention

Aus Figur 1 ist Schnitt durch ein Bauteil aus Aluminium zur Bildung einer Membran 1 für einen Ultraschallwandler gezeigt, das mit einer Konversionsschicht 2 mit der inneren Fläche 2a und der äußeren Fläche 2b versehen ist, die innen eine Leitfähigkeit herstellt und gleichzeitig einen Korrosionsschutz und eine Verbesserung der Klebeeigenschften sowie eine Verhinderung einer Neubildung von Oxydationsschichten und außen einen Korrosionsschutz mit einer Verbesserung der Haftung für eine Lackschicht ausbildet.Out FIG. 1 Fig. 12 is a sectional view of an aluminum member for forming a diaphragm 1 for an ultrasonic transducer provided with a conversion layer 2 having the inner surface 2a and the outer surface 2b, which conducts conductivity on the inside and at the same time provides anticorrosive and adhesive property improvement preventing formation of new oxidation layers and externally providing corrosion protection with an improvement in the adhesion of a paint layer.

Die Konversionsschicht 2, bzw. 2a, 2b, ist hier dadurch gebildet, dass in einem ersten Schritt eine Oxydschicht auf der Aluminiumoberfläche der Membran 1 entfernt wird und in einem zweiten Schritt vor einer Neubildung einer Oxydschicht die Oberfläche der Membran 1 mit der Konversionsschicht 2, bzw. 2a, 2b, mit eingebauten Metallionen aus Zirkonium oder Titan versiegelt wird. Die Entfernung der Oxydschicht im ersten Schritt kann auf einfache Weise durch Ätzen und die Versiegelung der Oberfläche kann auf nasschemischen Weg mit den Metallionen erfolgen.The conversion layer 2, or 2a, 2b, is formed here in that in a first step, an oxide layer on the aluminum surface of the membrane 1 is removed and in a second step before a new formation of an oxide layer, the surface of the membrane 1 with the conversion layer 2, or 2a, 2b, is sealed with incorporated metal ions of zirconium or titanium. The removal of the oxide layer in the first step can be done easily by etching and the sealing of the surface can be carried out in a wet-chemical way with the metal ions.

In Figur 2 ist gezeigt, wie im Inneren der Membran 1 ein piezokeramisches Bauelement als Ultraschallwandler 3 mittels eines Leitklebers 4 als Massekontakt auf die Membran 1 elektrisch leitend gefügt ist. Die äußere Kontaktierung des Ultraschallwandlers 3 erfolgt mit einem Kontakt 5 für die Masseanbindung und einem Kontakt 6 für das andere Potenzial. Die Masseanbindung erfolgt dabei über eine über den Ultraschallwandler 3 herumgezogene leitende Fläche 7, zum Beispiel mit dem Leitkleber 4.In FIG. 2 It is shown how in the interior of the membrane 1, a piezoceramic component as an ultrasonic transducer 3 by means of a conductive adhesive 4 as a ground contact on the membrane 1 is electrically conductively joined. The outer contacting of the ultrasonic transducer 3 is carried out with a contact 5 for the ground connection and a contact 6 for the other potential. The ground connection takes place via a conductive surface 7 drawn around via the ultrasound transducer 3, for example with the conductive adhesive 4.

Figur 3 zeigt eine Alternative der Masseanbindung des Ultraschallwandlers 3 an die Membran 1 über eine Leitkleberraupe 8, die seitlich von der leitenden Oberfläche der Membran 1 zu dem Massekontakt 5 über eine leitenden Massefläche 9 auf dem Ultraschallwandler 3 geführt ist. Aus Figur 4 ist hierzu ein Querschnitt zu entnehmen, der mit den gleichen Bezugszeichen versehen ist. FIG. 3 shows an alternative of the ground connection of the ultrasonic transducer 3 to the membrane 1 via a Leitkleberraupe 8, which is guided laterally from the conductive surface of the membrane 1 to the ground contact 5 via a conductive ground surface 9 on the ultrasonic transducer 3. Out FIG. 4 For this purpose, a cross section can be seen, which is provided with the same reference numerals.

In Figur 5 ist noch eine alternative elektrische Verbindung des auf der Membran 1 elektrisch kontaktierten Ultraschallwandlers 3 gezeigt, bei der ein Lötstützpunkt 10 auf der inneren Fläche der Membran 1 angeordnet ist, die mit dem Massepotenzial des auf der inneren Fläche der Membran 1 elektrisch über den Leitkleber 4 kontaktierten Ultraschallwandlers 3 verbunden ist und über den dann eine Kontaktierung mit dem Kontakt 5 erreicht werden kann.In FIG. 5 is still shown an alternative electrical connection of the electrically contacted on the membrane 1 ultrasonic transducer 3, in which a Lötstützpunkt 10 is disposed on the inner surface of the membrane 1, which contacted the ground potential of the on the inner surface of the membrane 1 electrically via the conductive adhesive 4 Ultrasonic transducer 3 is connected and then a contact with the contact 5 can be achieved.

Claims (10)

  1. Process for producing an electrical contact between an aluminium component part and a piezoceramic component, in which the earth contact of the piezoceramic component makes electrical contact with the surface of the aluminium component part, an oxide layer on the aluminium surface being removed in a first step, characterized in that, in a second step, before an oxide layer is re-formed, the surface is sealed with a conversion layer having incorporated metal ions.
  2. Process according to Claim 1, characterized in that the oxide layer is removed by etching.
  3. Process according to Claim 1 or 2, characterized in that the surface is sealed wet-chemically with metal ions of zirconium or titanium.
  4. Process according to one of the preceding claims, characterized in that contact is made with the piezoceramic component on the sealed surface by means of a conductive adhesive (4).
  5. Process according to one of the preceding claims, characterized in that a lacquer or a comparable insulation medium or anti-corrosion medium is applied to the sealed surface in a further coating step.
  6. Aluminium component part having an electrical contact with a piezoceramic component of which the earth contact makes electrical contact with the surface of the aluminium component part, characterized in that the electrical contact is produced according to one of the preceding claims.
  7. Component part according to Claim 6, characterized in that the component part has a hollow-cylindrical internal geometry with a diaphragm (1), to the inside of which an ultrasonic transducer (3) is applied as an electrical component in a mechanically fixed manner to produce an electrical earth contact (5) with the diaphragm (1).
  8. Component part according to Claim 6 or 7, characterized in that the electrical earth contact (5) is routed via a bead (8) of conductive adhesive from the diaphragm (1) to the ultrasonic transducer (3).
  9. Component part according to Claim 6 or 7, characterized in that the electrical earth contact (5) is routed via a soldering terminal (10) on the diaphragm (1).
  10. Use of a component part according to one of Claims 6 to 9, characterized in that the component part is a constituent part of an ultrasonic sensor for a surrounding-area recording system in a parking assistance system of a motor vehicle.
EP08773923.1A 2007-09-12 2008-07-09 Process for the surface treatment of aluminium and a layerwise construction of an aluminium component having an electric contact Active EP2188415B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007043479A DE102007043479A1 (en) 2007-09-12 2007-09-12 Process for the surface treatment of aluminum and a layer structure of a component made of aluminum with an electrical contact
PCT/EP2008/005574 WO2009036826A1 (en) 2007-09-12 2008-07-09 Process for the surface treatment of aluminium and a layerwise construction of an aluminium component having an electric contact

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EP2188415A1 EP2188415A1 (en) 2010-05-26
EP2188415B1 true EP2188415B1 (en) 2015-09-30

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EP (1) EP2188415B1 (en)
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DE (1) DE102007043479A1 (en)
WO (1) WO2009036826A1 (en)

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US20100213793A1 (en) 2010-08-26
EP2188415A1 (en) 2010-05-26
CN101802266B (en) 2012-01-11
DE102007043479A1 (en) 2009-03-19
CN101802266A (en) 2010-08-11
WO2009036826A1 (en) 2009-03-26
US8549746B2 (en) 2013-10-08

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