EP0142615B1 - Bath and process for the galvanic deposition of noble metal or noble metal-containing dispersion coatings - Google Patents

Bath and process for the galvanic deposition of noble metal or noble metal-containing dispersion coatings Download PDF

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Publication number
EP0142615B1
EP0142615B1 EP84108686A EP84108686A EP0142615B1 EP 0142615 B1 EP0142615 B1 EP 0142615B1 EP 84108686 A EP84108686 A EP 84108686A EP 84108686 A EP84108686 A EP 84108686A EP 0142615 B1 EP0142615 B1 EP 0142615B1
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Prior art keywords
noble metal
bath
graphite
dispersion coatings
coatings
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German (de)
French (fr)
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EP0142615A1 (en
Inventor
Georg Behringer
Hans Dr. Laub
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Siemens AG
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Siemens 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
    • C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
    • C25D15/02—Combined electrolytic and electrophoretic processes with charged materials
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/46—Electroplating: Baths therefor from solutions of silver

Definitions

  • the invention relates to a bath for the electrodeposition of noble metal and noble metal-containing dispersion coatings from solid lubricants, in particular baths containing graphite, wetting agent and gloss additive, and a method for the electrodeposition of such coatings, which is carried out using such a bath.
  • the surfaces of workpieces coated with precious metals and alloys containing precious metals, especially contacts, should have a high wear resistance, since malfunctions can be triggered if the precious metal layer is rubbed through.
  • the galvanic gold baths the potassium gold cyanide, potassium cyanide, disodium phosphate and, as a gloss additive, potassium silver cyanide (cyanidically alkaline baths) or potassium gold cyanide, Potassium citrate, citric acid and, as a gloss additive, cobalt sulfate ((acidic gold baths) can contain a fine-grained solid lubricant, especially graphite, and an isoalkyl sulfate that is soluble in acidic and alkaline aqueous gold baths.
  • a cyanide alkaline silver electrolyte with a content of 10 to 100 g / l of graphite with a grain size of 1 to 10 pm, 0.02 to 5 g / l of a gloss additive and 0.05 to 2 g / l of a wetting agent for the production of silver graphite dispersion coatings is known from the DE-OS 25 43 082 known.
  • the hardness of the silver-graphite dispersion coatings (HV 0.05) is in the range from 700 to 1000 N / mm 2 .
  • the wear of such dispersion layers is 1/10 or even less than that of pure silver under the same conditions.
  • the object of the invention is therefore to provide a bath for the galvanic deposition of precious metal and precious metal-containing coatings containing gloss additives, with the aid of which it is possible, in particular, to produce precious metal and precious metal-containing coatings in a simple and economical manner, which have improved wear resistance.
  • the dispersion coatings produced using a bath according to the invention have increased hardness and an extraordinary improvement in wear resistance. There is also a certain self-lubricating effect. It was surprising that the abrasion resistance of precious metal / graphite coatings increased extremely with their hardness. The effect is particularly great with layers of gloss baths. A combination effect results from the addition of graphite and hardener. The wear resistance is increased by 2 to 3 orders of magnitude compared to normal silver coatings. This was demonstrated by abrasion tests on samples made of copper sheet, which were coated with silver or silver / graphite coatings.
  • Additives suitable for the practice of the invention are potassium antimony (III) oxide tartrate, nickel (11-acetate, cobalt (11) citrate.
  • the invention further relates to a method for the electrodeposition of noble metal and noble metal-containing dispersion coatings using a bath of the above composition which is characterized in that the bath at a temperature of 18 to 30 ° C with a current density of 0.2 to 5 A / dm 2 is operated.
  • the layers obtainable from a bath according to the invention can be deposited directly or using intermediate layers on steel, copper and copper alloys, aluminum and aluminum alloys and nickel.
  • the known noble metal and noble metal-containing electrolytes are suitable for the present invention. Particularly suitable contain potassium cyanide and the noble metal in the form of, for example, potassium silver cyanide. Furthermore, the electrolyte contains fine-grained solid lubricants such as. B. graphite and wetting agents such. B. Turkish red oils, sulfonated oleate esters, fatty alcohol sulfonates e.g. B. sodium lauryl sulfate, alkylarylsulfonates. The electrolyte may also contain a brightener, such as. B. Turkish red oil, carbon disulfide, sodium xanthate, dithiocarbamate, sodium tiosulfate, sodium selenite.
  • a brightener such as. B. Turkish red oil, carbon disulfide, sodium xanthate, dithiocarbamate, sodium tiosulfate, sodium selenite.
  • the surface lubricant-containing, primarily graphite-containing surface layers obtained according to the invention are widely used. They can be used, for example, for connectors and on contact pieces on signaling and auxiliary switches.
  • Silver / graphite layers were deposited on a copper sheet from a bath (shiny silver bath) of the following composition.
  • a contact rivet silver rivet
  • a specific load 100 cN
  • a double stroke 2 cm, length of the friction track 1 cm, frequency: 1 double stroke / s.
  • the friction path to the friction was> 6000 m.
  • the friction path was only 11.9 m for silver layers made of a glossy bath without graphite and without hardener additive.
  • Metal objects e.g. B. electrical contacts, the surface of which is to be subjected to wear, were coated with a gold / graphite dispersion coating after a pretreatment customary in electroplating and the application of a nickel intermediate layer in an electrolyte of the following composition.
  • a gold / graphite dispersion coating after a pretreatment customary in electroplating and the application of a nickel intermediate layer in an electrolyte of the following composition.
  • the increase in wear resistance was about 2 orders of magnitude.
  • a sliding contact is shown schematically, which can be used as a knife contact in rotary switches for low voltage, in particular in signaling and signaling technology.
  • the two contacts 1, 2 of the sliding contact which can be separated from one another are intended to interact with the least possible friction.
  • the friction should be reduced and on the other hand the closing or switching angle tolerance should be reliably ensured.
  • the two spherically shaped contact springs 1, 2 are provided in pairs, the contacts 1, 2 being pressed against one another in the direction of the arrow 3, 4 under the force of a spring or by self-suspension with a specific contact force. These two adjacent contacts 1, 2 are pressed apart by a contact knife 5, the contact surfaces of the contacts 1, 2 receiving the knife 5 between them while maintaining the contact force.
  • the run-up areas 1a, 2a and the run-off areas 1b and 2b are loaded by the start-up and run-off flanks 5a, 5b of the contact blade 5 during the switch-on and switch-off movement.

Abstract

1. A bath for the electrolytic deposition of dispersion coatings of or containing a noble metal, which bath contains a noble metal compound, a solid lubricant, in particular but not exclusively graphite, a cross-linking agent and a gloss additive, characterized by a content of 1 to 10 g/l of a cobalt, nickel, or antimony salt of tartaric, citric or acetic acid.

Description

Die Erfindung betrifft ein Bad zum galvanischen Abscheiden von Edelmetall- und edelmetallhaltigen Dispersionsüberzügen aus Feststoffschmiermittel, insbesondere Graphit, Netzmittel und Glanzzusatz enthaltenden Bädern, sowie ein Verfahren zum galvanischen Abscheiden solcher Überzüge, das unter Verwendung eines solchen Bades durchgeführt wird.The invention relates to a bath for the electrodeposition of noble metal and noble metal-containing dispersion coatings from solid lubricants, in particular baths containing graphite, wetting agent and gloss additive, and a method for the electrodeposition of such coatings, which is carried out using such a bath.

Die Oberflächen von mit Edelmetallen und mit edelmetallhaltigen Legierungen beschichteten Werkstücken vor allem Kontakten sollen eine hohe Verschleißfestigkeit aufweisen, da bei einem eventuellen Durchrieb der Edelmetallschicht Funktionsstörungen ausgelöst werden können.The surfaces of workpieces coated with precious metals and alloys containing precious metals, especially contacts, should have a high wear resistance, since malfunctions can be triggered if the precious metal layer is rubbed through.

Bei bekannten Verfahren und Bädern (DE-OS 30 32 469 entsprechend zu EP-A-0 046 912) zur galvanischen Abscheidung von Golddispersionsüberzügen werden die galvanischen Goldbäder, die Kaliumgoldcyanid, Kaliumcyanid, Dinatriumphosphat und als Glanzzusatz Kaliumsilbercyanid (cyanidisch alkalische Bäder) oder Kaliumgoldcyanid, Kaliumcitrat, Citronensäure und als Glanzzusatz Kobaltsulfat ((saure Goldbäder) enthalten können mit einem feinkörnigen Feststoffschmiermittel, insbesondere Graphit und einem in sauren und alkalischen wässrigen Goldbädern löslichen Isoalkylsulfat versetzt.In known processes and baths (DE-OS 30 32 469 corresponding to EP-A-0 046 912) for the electrodeposition of gold dispersion coatings, the galvanic gold baths, the potassium gold cyanide, potassium cyanide, disodium phosphate and, as a gloss additive, potassium silver cyanide (cyanidically alkaline baths) or potassium gold cyanide, Potassium citrate, citric acid and, as a gloss additive, cobalt sulfate ((acidic gold baths) can contain a fine-grained solid lubricant, especially graphite, and an isoalkyl sulfate that is soluble in acidic and alkaline aqueous gold baths.

Ein cyanidischer alkalischer Silberelektrolyt mit einem Gehalt von 10 bis 100 g/I Graphit der Korngröße 1 bis 10 pm, 0,02 bis 5 g/I eines Glanzzusatzes und 0,05 bis 2 g/I eines Netzmittels zur Herstellung von Silbergraphitdispersionsüberzügen ist aus der DE-OS 25 43 082 bekannt. Die Härte der Silber-Graphit-Dispersionsüberzüge (HV 0,05) liegt im Bereich von 700 bis 1000 N/mm2. Der Verschleiß derartiger Dispersionsschichten ist 1/10 oder sogar weniger als der von reinem Silber unter den selben Bedingungen.A cyanide alkaline silver electrolyte with a content of 10 to 100 g / l of graphite with a grain size of 1 to 10 pm, 0.02 to 5 g / l of a gloss additive and 0.05 to 2 g / l of a wetting agent for the production of silver graphite dispersion coatings is known from the DE-OS 25 43 082 known. The hardness of the silver-graphite dispersion coatings (HV 0.05) is in the range from 700 to 1000 N / mm 2 . The wear of such dispersion layers is 1/10 or even less than that of pure silver under the same conditions.

Für viele Anwendungszwecke sind aber diese Eigenschaften insbesondere im Hinblick auf die Verschleißfestigkeit immer noch nicht ausreichen.For many applications, however, these properties are still not sufficient, particularly with regard to wear resistance.

Aufgabe der Erfindung ist es daher ein Bad zum galvanischen Abscheiden von glanzzusatzhaltigen Edelmetall- und edelmetallhaltigen Überzügen anzugeben mit dessen Hilfe es insbesondere möglich ist, auf einfache und wirtschaftliche Weise Edelmetall und edelmetallhaltige Überzüge zu erzeugen, die eine verbesserte Verschleißfestigkeit aufweisen.The object of the invention is therefore to provide a bath for the galvanic deposition of precious metal and precious metal-containing coatings containing gloss additives, with the aid of which it is possible, in particular, to produce precious metal and precious metal-containing coatings in a simple and economical manner, which have improved wear resistance.

Diese Aufgabe wird gelöst mit in der Galvanotechnik üblichen graphithaltigen Edelmetall- und edelmetallhaltigen Bädern die erfindungsgemäß pro Liter einen Zusatz von 1 bis 10 g/1 eines Kobalt-, Nickel-oder Antimonsalzes der Wein-, Citronen- oder Essigsäure enthalten. Die erfindungsgemäß eingesetzten Salze der organischen Säuren wirken härtesteigernd.This object is achieved with graphite-containing noble metal and noble metal-containing baths which are customary in electroplating and which, according to the invention, contain an addition of 1 to 10 g / l of a cobalt, nickel or antimony salt of tartaric, citric or acetic acid. The organic acid salts used according to the invention have a hardness-increasing effect.

Die unter Verwendung eines erfindungsgemäßen Bades erzeugten Dispersionsüberzüge insbesondere Silber/Graphit-, Gold/Graphit-, Palladium/Graphit-, Palladium/Nickel/ Graphit-Überzüge weisen erhöhte Härte und eine außerordentliche Verbesserung der Verschleißfestigkeit auf. Außerdem entsteht ein gewisser Selbstschmiereffekt. Es war überraschend, daß die Abriebfestigkeit von Edelmetall/Graphit-Überzüge mit deren Härte außerordentlich stark ansteigt. Bei Schichten aus Glanzbädern ist der Effekt besonders groß. Durch den Graphit- und Härterzusatz resultiert ein Kombinationseffekt. Die Verschleißbeständigkeit wird um 2 bis 3 Größenordnungen gegenüber normalen Silberüberzügen erhöht. Abriebversuche an Proben aus Kupferblech, die mit Silber- bzw. Silber/Graphit-Überzügen beschichtet wurden, bewiesen dies.The dispersion coatings produced using a bath according to the invention, in particular silver / graphite, gold / graphite, palladium / graphite, palladium / nickel / graphite coatings, have increased hardness and an extraordinary improvement in wear resistance. There is also a certain self-lubricating effect. It was surprising that the abrasion resistance of precious metal / graphite coatings increased extremely with their hardness. The effect is particularly great with layers of gloss baths. A combination effect results from the addition of graphite and hardener. The wear resistance is increased by 2 to 3 orders of magnitude compared to normal silver coatings. This was demonstrated by abrasion tests on samples made of copper sheet, which were coated with silver or silver / graphite coatings.

Für die Durchführung der Erfindung geeignete Zusätze sind Kaliumantimon(III)-oxidtartrat, Nickel(11-acetat, Kobalt(11)-citrat.Additives suitable for the practice of the invention are potassium antimony (III) oxide tartrate, nickel (11-acetate, cobalt (11) citrate.

Gegenstand der Erfindung ist ferner noch ein Verfahren zum galvanischen Abscheiden von Edelmetall- und edelmetallhaltigen Dispersionsüberzügen unter Verwendung eines Bades der vorstehend angegebenen Zusammensetzung das dadurch gekennzeichnet ist, daß das Bad bei einer Temperatur von 18 bis 30° C mit einer Stromdichte von 0,2 bis 5 A/dm2 betrieben wird.The invention further relates to a method for the electrodeposition of noble metal and noble metal-containing dispersion coatings using a bath of the above composition which is characterized in that the bath at a temperature of 18 to 30 ° C with a current density of 0.2 to 5 A / dm 2 is operated.

Die aus einem Bad gemäß der Erfindung erzielbaren Schichten können direkt oder unter Verwendung von Zwischenschichten - auf Stahl, Kupfer und Kupferlegierungen, Aluminium und Aluminiumlegierungen und Nickel niedergeschlagen werden.The layers obtainable from a bath according to the invention can be deposited directly or using intermediate layers on steel, copper and copper alloys, aluminum and aluminum alloys and nickel.

Für die vorliegende Erfindung sind die bekannten Edelmetall- und edelmetallhaltigen Elektrolyte geeignet. Besonders geeignete enthalten Kaliumcyanid und das Edelmetall in Form von beispielsweise Kaliumsilbercyanid. Ferner enthält der Elektrolyt feinkörnige Feststoffschmiermittel wie z. B. Graphit und Netzmittel wie z. B. Türkischrotöle, sulfonierte Oleatester, Fettalkoholsulfonate z. B. Natriumlaurylsulfat, Alkylarylsulfonate. Der Elektrolyt kann auch einen Glanzzusatz enthalten, wie z. B. Türkischrotöl, Schwefelkohlenstoff, Natriumxanthogenat, Dithiocarbamat, Natriumtiosulfat, Natriumselenit.The known noble metal and noble metal-containing electrolytes are suitable for the present invention. Particularly suitable contain potassium cyanide and the noble metal in the form of, for example, potassium silver cyanide. Furthermore, the electrolyte contains fine-grained solid lubricants such as. B. graphite and wetting agents such. B. Turkish red oils, sulfonated oleate esters, fatty alcohol sulfonates e.g. B. sodium lauryl sulfate, alkylarylsulfonates. The electrolyte may also contain a brightener, such as. B. Turkish red oil, carbon disulfide, sodium xanthate, dithiocarbamate, sodium tiosulfate, sodium selenite.

Die gemäß der Erfindung erhaltenen feststoffschmiermittelhaltigen vornehmlich graphithaltigen Oberflächenschichten finden vielfach Verwendung. Sie können beispielsweise für Steckverbinder und auf Kontaktstücken von Melde- und Hilfsschaltern eingesetzt werden.The surface lubricant-containing, primarily graphite-containing surface layers obtained according to the invention are widely used. They can be used, for example, for connectors and on contact pieces on signaling and auxiliary switches.

Die Erfindung wird durch die folgenden Beispiele und die Zeichnung näher erläutert.The invention is illustrated by the following examples and the drawing.

Beispiel 1example 1

Aus einem Bad (Glanzsilberbad) folgender Zusammensetzung wurden Silber/Graphitschichten auf einem Kupferblech abgeschieden.

Figure imgb0001
Zur Prüfung auf Abriebfestigkeit wurde eine Apparatur benutzt, bei der ein Kontaktniet (Silberniet) unter bestimmter Belastung (100 cN) auf dem beschichteten Grundkörper (Kupferplättchen mit Silber bzw. Silbergraphitschicht) hin- und herbewegt wird (ein Doppelhub = 2 cm, Länge der Reibspur 1 cm, Frequenz: 1 Doppelhub/s). Der Reibweg bis zum Durchrieb war, wie bereits oben angegeben, > 6000 m. Bei Silberschichten aus einem Glanzbad ohne Graphit und ohne Härterzusatz betrug der Reibweg demgegenüber nur 11,9 m.Silver / graphite layers were deposited on a copper sheet from a bath (shiny silver bath) of the following composition.
Figure imgb0001
 To test for abrasion resistance, an apparatus was used in which a contact rivet (silver rivet) is moved back and forth on the coated base body (copper plate with silver or silver graphite layer) under a specific load (100 cN) (a double stroke = 2 cm, length of the friction track 1 cm, frequency: 1 double stroke / s). As already mentioned above, the friction path to the friction was> 6000 m. In contrast, the friction path was only 11.9 m for silver layers made of a glossy bath without graphite and without hardener additive.

Beispiel 2Example 2

Gegenstände aus Metall, z. B. elektrische Kontakte, deren Oberfläche einer Verschleißbeanspruchung unterworfen werden soll, wurden nach einer in der Galvanotechnik üblichen Vorbehandlung und dem Aufbringen einer Nickelzwischenschicht in einem Elektrolyten folgender Zusammensetzung mit einem Gold/Graphit-Dispersionsüberzug beschichtet.

Figure imgb0002
Gegenüber einem Glanzgoldbad ohne Graphit und ohne dem Härterzusatz Nickel(II)-acetat betrug die Erhöhung der Verschleißfestigkeit etwa 2 Größenordnungen.Metal objects, e.g. B. electrical contacts, the surface of which is to be subjected to wear, were coated with a gold / graphite dispersion coating after a pretreatment customary in electroplating and the application of a nickel intermediate layer in an electrolyte of the following composition.
Figure imgb0002
 Compared to a bright gold bath without graphite and without the hardener additive nickel (II) acetate, the increase in wear resistance was about 2 orders of magnitude.

In der Figur ist ein Gleitkontakt schematisch dargestellt, der als Messerkontakt bei Drehschaltern für Niederspannung insbesondere in der Signal- und Meldetechnik Verwendung finden kann.In the figure, a sliding contact is shown schematically, which can be used as a knife contact in rotary switches for low voltage, in particular in signaling and signaling technology.

Die beiden voneinander trennbaren Kontakte 1, 2 des Gleitkontaktes sollen hierfür mit einer möglichst geringen Reibung zusammenwirken. Insbesondere soll, bedingt durch Fertigungstoleranzen, bei einer Abweichung von der vorbestimmten Betätigungsrichtung des beweglichen Kontaktes einerseits die Reibung vermindert werden und andererseits die Schließ- bzw. Schaltwinkeltoleranz sicher gewährleistet bleiben.For this purpose, the two contacts 1, 2 of the sliding contact which can be separated from one another are intended to interact with the least possible friction. In particular, due to manufacturing tolerances, if there is a deviation from the predetermined direction of actuation of the movable contact, on the one hand the friction should be reduced and on the other hand the closing or switching angle tolerance should be reliably ensured.

Bei dem in der Figur dargestellten Ausführungsbeispiel sind die beiden ballig geformten Kontaktfedern 1, 2 paarweise vorgesehen, wobei die Kontakte 1, 2 unter der Kraft einer Feder oder durch Eigenfederung mit einer bestimmten Kontaktkraft in Pfeilrichtung 3, 4 gegeneinander gedrückt werden. Diese beiden anliegenden Kontakte 1, 2 werden von einem Kontaktmesser 5 auseinandergedrückt, wobei die Kontaktflächen der Kontakte 1, 2 das Messer 5 zwischen sich unter Beibehaltung der Kontaktkraft aufnehmen. Die Anlaufbereiche 1a, 2a und die Ablaufbereiche 1 b und 2b sind während der Ein- und Ausschaltbewegung durch die An- bzw. Ablaufflanken 5a, 5b des Kontaktmessers 5 belastet. An den Anlauf- und Ablaufstellen findet ein erhöhter Abrieb statt, der durch Beschichtung der Kontaktflächen unter Anwendung des erfindungsgemäßen Bades einerseits durch die erzielte Schmierwirkung und andererseits durch die mögliche härtere Ausführung des galvanischen Überzugs verringert wird. Es ist vorteilhaft, die Kontaktflächen unter Anwendung des erfindungsgemäßen Bades zu beschichten, so daß bei dem Messerkontakt selbst bei einem geringfügigen Mittenversatz in Bezug auf die beiden Kontakte 1, 2 und damit bedingt, durch die Veränderung der Verschleißstelle, dennoch eine hohe Lebensdauer erzielbar sind.In the embodiment shown in the figure, the two spherically shaped contact springs 1, 2 are provided in pairs, the contacts 1, 2 being pressed against one another in the direction of the arrow 3, 4 under the force of a spring or by self-suspension with a specific contact force. These two adjacent contacts 1, 2 are pressed apart by a contact knife 5, the contact surfaces of the contacts 1, 2 receiving the knife 5 between them while maintaining the contact force. The run-up areas 1a, 2a and the run-off areas 1b and 2b are loaded by the start-up and run-off flanks 5a, 5b of the contact blade 5 during the switch-on and switch-off movement. There is increased abrasion at the contact and discharge points, which is reduced by coating the contact surfaces using the bath according to the invention on the one hand due to the lubricating effect achieved and on the other hand due to the possible harder design of the galvanic coating. It is advantageous to close the contact areas using the bath according to the invention coat so that a long service life can still be achieved with the knife contact even with a slight center misalignment with respect to the two contacts 1, 2 and thus due to the change in the wear point.

Bei sogenannten Paketschaltern mit einer Vielzahl von in der Figur dargestellten Kontaktanordnungen bleibt die Antriebs- bzw. Betätigungskraft für den Schalter gering.In so-called packet switches with a large number of contact arrangements shown in the figure, the driving or actuating force for the switch remains low.

Claims (4)

1. A bath for the electrolytic deposition of dispersion coatings of or containing a noble metal, which bath contains a noble metal compound, a solid lubricant, in particular but not exclusively graphite, a cross-linking agent and a gloss additive, characterised by a content of 1 to 10 g/I of a cobalt, nickel, or antimony salt of tartaric, citric or acetic acid.
2. A bath as claimed in Claim 1, characterised by a content of 1 to 10 g/I of potassium antimony-(III)-oxide tartrate.
3. A method of producing dispersion coatings using a bath as claimed in Claim 1, characterised in that deposition is carried out at a temperature of 18 to 30° C with a current density of 0.2 to 5 A/dm2.
4. The use of a bath as claimed in Claim 1 for the electrolytic deposition of graphite dispersion coatings of or containing noble metal for the contacts of alarm and auxiliary switches.
EP84108686A 1983-08-03 1984-07-23 Bath and process for the galvanic deposition of noble metal or noble metal-containing dispersion coatings Expired EP0142615B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84108686T ATE28483T1 (en) 1983-08-03 1984-07-23 BATH AND PROCESS FOR THE ELECTROPLATING OF PRECIOUS METAL AND PRECIOUS METAL-CONTAINING DISPERSION COATINGS.

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Application Number Priority Date Filing Date Title
DE19833328067 DE3328067A1 (en) 1983-08-03 1983-08-03 BATH AND METHOD FOR GALVANICALLY DEPOSITING DISPERSIONS CONTAINING PRECIOUS METAL AND METAL
DE3328067 1983-08-03

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EP0142615A1 EP0142615A1 (en) 1985-05-29
EP0142615B1 true EP0142615B1 (en) 1987-07-22

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DE3912681A1 (en) * 1989-04-18 1990-10-25 Winter & Sohn Ernst METHOD FOR GALVANIC COATING OF SEGMENT SURFACES ARRANGED ON THE SURFACE OF A BASIC BODY AND PRODUCTS PRODUCED AFTER THAT
GB2251133B (en) * 1990-10-09 1995-03-15 Fuji Electric Co Ltd Sliding contactor for electric equipment
DE4142857A1 (en) * 1991-12-20 1993-06-24 Siemens Ag METHOD FOR PRODUCING AN ELECTRICAL CONTACT
DE102018005348A1 (en) * 2018-07-05 2020-01-09 Dr.-Ing. Max Schlötter GmbH & Co KG Silver electrolyte for the deposition of dispersion silver layers and contact surfaces with dispersion silver layers
DE102018005352A1 (en) * 2018-07-05 2020-01-09 Dr.-Ing. Max Schlötter GmbH & Co KG Silver electrolyte for the deposition of dispersion silver layers and contact surfaces with dispersion silver layers

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CH615464A5 (en) * 1976-06-01 1980-01-31 Systemes Traitements Surfaces Special compositions and particular additives for gold electrolysis baths and their use
DE3032469A1 (en) * 1980-08-28 1982-04-01 Siemens AG, 1000 Berlin und 8000 München CYANIDIC GOLD BATHS AND GALVANIC DEPOSITION OF SOLID LUBRICANT-CONTAINING GOLD DISPERSION SURFACES AND ITS APPLICATION

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ATE28483T1 (en) 1987-08-15
EP0142615A1 (en) 1985-05-29
DE3464936D1 (en) 1987-08-27

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