EP2819539A1 - Coin blank and method for the production thereof - Google Patents

Coin blank and method for the production thereof

Info

Publication number
EP2819539A1
EP2819539A1 EP12706201.6A EP12706201A EP2819539A1 EP 2819539 A1 EP2819539 A1 EP 2819539A1 EP 12706201 A EP12706201 A EP 12706201A EP 2819539 A1 EP2819539 A1 EP 2819539A1
Authority
EP
European Patent Office
Prior art keywords
copper
nickel
nickel layer
doping
coin
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.)
Granted
Application number
EP12706201.6A
Other languages
German (de)
French (fr)
Other versions
EP2819539B1 (en
Inventor
Thomas Bilas
Stephan Siegel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saxonia Eurocoin GmbH
Original Assignee
Saxonia Eurocoin GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Saxonia Eurocoin GmbH filed Critical Saxonia Eurocoin GmbH
Publication of EP2819539A1 publication Critical patent/EP2819539A1/en
Application granted granted Critical
Publication of EP2819539B1 publication Critical patent/EP2819539B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C21/00—Coins; Emergency money; Beer or gambling coins or tokens, or the like
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C25D5/50—After-treatment of electroplated surfaces by heat-treatment
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C25D5/50—After-treatment of electroplated surfaces by heat-treatment
    • C25D5/505—After-treatment of electroplated surfaces by heat-treatment of electroplated tin coatings, e.g. by melting
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/627—Electroplating characterised by the visual appearance of the layers, e.g. colour, brightness or mat appearance
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/005—Jewels; Clockworks; Coins

Definitions

  • the invention relates to a blank for a coin (coin blank) with a core material made of a ferrous material, which is covered with an outer nickel layer.
  • Blanks for coins made of a nickel-plated or in particular electroplated with nickel-coated iron material are common practice internationally. Coined coins appeal to consumers as a means of payment because of their permanently bright metallic luster. Nickel also excellently fulfills the purpose of corrosion protection and abrasion resistance for a long use of the circulation coins.
  • Circulating coins generally have multiple personal contact and are therefore also potential carriers of bacteria and other pathogenic germs. This is why coins used to be massively embossed from the metals silver and copper and their alloys, and the strong antimicrobial effect of silver and copper was also detectable. Silver used to be widely used as coin metal with monetary value and also because of its beautiful luster. However, due to the high price of silver, the stake is currently largely limited to special coins only.
  • Coins made of copper or copper-plated coins with a steel core form in circulation after a relatively short time, oxide, matte, dark layers, making such coins for the user quickly visually unattractive, as is currently the case with the euro coins of nominal 1, 2 and 5 cents is.
  • internationally common coins made of a nickel alloy or nickel-coated coins with steel core have permanently one beautiful bright luster, but have no antimicrobial properties.
  • the consumer has been found to enjoy preferably circulation coins with a bright luster, so that coins with nickel gloss in front of coins with a matte copper surface are generally preferred.
  • the object is to provide a coin blank with a core of a ferrous material, which has a durable shiny nickel layer and which is embossable into a coin having antimicrobial properties.
  • a coin blank comprises a core of an iron material and a nickel layer into which a very finely divided doping of the antimicrobially active metals copper, silver, zinc, tin is introduced on the surface and near the surface.
  • the doping has a penetration depth in the nickel layer of 0.5 to 10 ⁇ .
  • the nickel layer contains less than 100% by mass of the doped metal, for example 18 to 65% by mass of copper, the remainder being nickel. At a concentration higher than 65 mass% outweighs the unwanted color change, for example, from silver to reddish color with copper doping. At a concentration of less than 18% by mass, the antimicrobial effect and the reproducibility diminish.
  • the exact limits of the optimum concentration of the doped metal may depend on the doped metal. In general, a range of 10 to 80% by mass, in particular 18 to 65% by mass, of the doped metal is considered to be advantageous.
  • a copper layer of 0.5 ⁇ to ⁇ galvanically applied to the iron core with a nickel layer of conventional thickness is annealed for 0.5-2h at a temperature of 400 to 1200 ° C, whereby the doping of the surface of the nickel layer according to the invention with copper is achieved.
  • the originally closed copper layer is dissolved and penetrates as doping completely into the nickel layer. Copper is no longer present as a separate layer, but it is detectable as a doping of 2 - 20 mass% Cu in the nickel layer.
  • the concentration of doping in the nickel layer decreases continuously from the surface of the coin blank to the core.
  • the nickel gloss is retained and at the same time the antimicrobial properties of the copper are effective.
  • doping of the nickel layer with another metal from the series of known antimicrobial metals, such as silver, zinc, tin, in addition to or instead of copper is possible.
  • the advantages of such coins, which are embossed from a coin blank according to the invention consist in the fact that, firstly, the aesthetic gloss of the nickel layer is permanently retained even in the long-term circulation of the coins, and discoloration due to oxidation of copper or tarnishing of silver does not occur ,
  • a coin is provided with a nickel layer having the antimicrobial properties of copper, silver, zinc, tin in the form of a low doping in the surface region of the nickel layer. It has surprisingly been found that a low doping according to the invention of the near-surface zone of the nickel layer has a high efficiency with respect to the antimicrobial effect of the circulating coins ultimately embossed from the coin blank according to the invention.
  • the coin blank according to the invention enables coinage of a new quality, namely coins with a core made of a ferrous material, which show a bright shine through a nickel coating and at the same time the antimicrobial properties of copper or silver u.a. have.
  • inventive solution does not exclude blanks for memorial embossing, medals and similar applications.
  • articles having a nickel or copper-free nickel alloy surface are, according to the invention, dopable with copper, silver, zinc or tin, e.g. Handles, doorknobs, fittings u.a.
  • the invention thus furthermore relates to an article having a surface made of a nickel-containing material, characterized in that the nickel-containing material has on the surface a doping of at least one metal from the series of the metals copper, silver, zinc, tin.
  • the nickel-containing material may be nickel or a nickel alloy.
  • nickel alloy can be formed with metals other than copper, silver, zinc, tin.
  • Fig. 1 shows the cross section through a coin blank according to the invention (coin blank).
  • the coin blank comprises a core / of a customary for Münzoniagungen low-alloy steel, which is coated with a plated nickel layer 2 of 30 ⁇ strength, in which a copper doping 3 is introduced with atomic distribution superficial and surface.
  • the copper doping 3 has a penetration depth of 5 ⁇ in the nickel layer 2 and has a degressive concentration gradient within the nickel layer 2.
  • Fig. 2a shows a cross section through a conventional, nickel-coated coin blank as prior art
  • 2b shows the cross section through a coin blank according to the invention with the concentration profile of the copper doping 3 in the nickel layer 2.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Adornments (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

Coins consisting of a steel core and a nickel surface layer are internationally known, as are coins with a copper surface layer. In circulating coins, nickel remains shiny, while copper becomes dull and dark, whereby the coin loses aesthetic appeal. In contrast to nickel, however, copper has antimicrobial properties. The objective is to provide a coin blank from which a coin can be stamped that permanently retains its shine and also has antimicrobial properties. The coin blank according to the invention consists of a core made of an iron material (1) with a surface layer (2) made of nickel which has ultra-finely dispersed doping (3), preferably consisting of copper, on and near the surface.

Description

Münzrohling (coin blank) und Verfahren zu seiner Herstellung  Coin blank and process for its production
Die Erfindung betrifft einen Rohling für eine Münze (coin blank) mit einem Kernmaterial aus einem Eisenwerkstoff, der mit einer äußeren Nickelschicht bedeckt ist. The invention relates to a blank for a coin (coin blank) with a core material made of a ferrous material, which is covered with an outer nickel layer.
Rohlinge für Münzen aus einem mit Nickel plattiertem oder insbesondere galvanisch mit Nickel beschichtetem Eisenwerkstoff sind international allgemein üblich. Daraus geprägte Münzen gefallen den Verbrauchern als Zahlungsmittel wegen ihres dauerhaft hellen Metallglanzes. Nickel erfüllt dabei auch hervorragend den Zweck des Korrosionsschutzes und der Abriebfestigkeit für einen langen Gebrauch der Umlaufmünzen. Blanks for coins made of a nickel-plated or in particular electroplated with nickel-coated iron material are common practice internationally. Coined coins appeal to consumers as a means of payment because of their permanently bright metallic luster. Nickel also excellently fulfills the purpose of corrosion protection and abrasion resistance for a long use of the circulation coins.
Wegen seiner allergenen Eigenschaften wird Nickel als Deckschicht aber teilweise gemieden oder durch eine zweite Schicht aus Kupfer überdeckt. DE 41 20 291 beschreibt einen Münzrohling mit einem Kern aus einem Eisenwerkstoff, der mit einer ersten Schicht aus Nickel und einer zweiten Schicht aus Kupfer und vorzugsweise mit einer dritten Schicht aus Nickel bedeckt ist. Eine Zweifachbeschichtung Nickel-Kupfer zeigt ebenfalls den bekannten optischen Nachteil, dass eine Kupferdeckschicht im Langzeit-Gebrauch matt wird. Andererseits ist die Dreifachbeschichtung Nickel-Kupfer-Nickel aufwendig und bringt aber nicht den Vorteil einer antimikrobiellen Wirkung, wie sie eine Deckschicht aus Kupfer besitzt. Diese antimikrobielle Wirkung von Kupfer und insbesondere von Silber ist allgemein bekannt. Because of its allergenic properties, however, nickel is partially avoided as a topcoat or covered by a second layer of copper. DE 41 20 291 describes a coin blank having a core of a ferrous material which is covered with a first layer of nickel and a second layer of copper and preferably with a third layer of nickel. A double coating of nickel-copper also shows the known optical disadvantage that a copper capping becomes dull in long-term use. On the other hand, the triple coating nickel-copper-nickel is complex and does not bring the advantage of an antimicrobial effect, as it has a cover layer of copper. This antimicrobial effect of copper and especially of silver is well known.
Umlaufmünzen haben generell einen vielfachen Personenkontakt und sind deshalb auch potentielle Überträger von Bakterien und anderen pathogenen Keimen. Deshalb wurden früher auch deshalb Münzen massiv aus den Metallen Silber und Kupfer und aus deren Legierungen geprägt, wobei auch die starke antimikrobielle Wirkung von Silber und Kupfer nachweisbar wurde. Silber wurde früher als Münzmetall mit Geldwert und auch wegen seines schönen Glanzes umfangreich verwendet. Der Einsatz bleibt aber wegen des hohen Silberpreises aktuell weitgehend nur noch auf Sondermünzen beschränkt. Circulating coins generally have multiple personal contact and are therefore also potential carriers of bacteria and other pathogenic germs. This is why coins used to be massively embossed from the metals silver and copper and their alloys, and the strong antimicrobial effect of silver and copper was also detectable. Silver used to be widely used as coin metal with monetary value and also because of its beautiful luster. However, due to the high price of silver, the stake is currently largely limited to special coins only.
Münzen aus Kupfer oder verkupferte Münzen mit einem Stahlkern bilden im Umlauf nach relativ kurzer Zeit oxidische, matte, dunkle Deckschichten, wodurch solche Münzen für den Nutzer schnell optisch unattraktiv werden, wie das bei den Euromünzen der Nominale 1 , 2 und 5 Cent aktuell der Fall ist. International übliche Münzen aus einer Nickellegierung oder mit einer Nickelschicht versehene Münzen mit Stahlkern besitzen zwar dauerhaft einen schönen hellen Glanz, verfügen aber über keine antimikrobiellen Eigenschaften. Dem Verbraucher gefallen aber erwiesenermaßen bevorzugt Umlaufmünzen mit einem hellen Glanz, so dass allgemein Münzen mit Nickelglanz vor Münzen mit einer matten Kupferoberfläche bevorzugt werden. Coins made of copper or copper-plated coins with a steel core form in circulation after a relatively short time, oxide, matte, dark layers, making such coins for the user quickly visually unattractive, as is currently the case with the euro coins of nominal 1, 2 and 5 cents is. Although internationally common coins made of a nickel alloy or nickel-coated coins with steel core have permanently one beautiful bright luster, but have no antimicrobial properties. However, the consumer has been found to enjoy preferably circulation coins with a bright luster, so that coins with nickel gloss in front of coins with a matte copper surface are generally preferred.
Aufgabe ist es, einen Münzrohling (coin blank) mit einem Kern aus einem Eisenwerkstoff bereitzustellen, der eine dauerhafte glänzende Nickelschicht aufweist und der zu einer Münze prägbar ist, die antimikrobielle Eigenschaften aufweist. The object is to provide a coin blank with a core of a ferrous material, which has a durable shiny nickel layer and which is embossable into a coin having antimicrobial properties.
Erfindungsgemäß umfasst ein Münzrohling einen Kern aus einem Eisen Werkstoff und eine Nickelschicht, in die eine feinstdisperse Dotierung aus den antimikrobiell wirksamen Metallen Kupfer, Silber, Zink, Zinn oberflächlich und oberflächennah eingebracht ist. Die Dotierung besitzt eine Eindringtiefe in die Nickelschicht von 0,5 bis 10 μιη. An der Oberfläche enthält die Nickelschicht weniger als 100 Massen-% des dotierten Metalls, beispielsweise 18 bis 65 Massen-% Kupfer, Rest Nickel. Bei einer Konzentration höher als 65 Massen-% überwiegt die ungewünschte Farbänderung, beispielsweise von silberner zu rötlicher Farbe bei Kupfer-Dotierung. Bei einer Konzentration kleiner als 18 Massen-% lässt die antimikrobielle Wirkung sowie die Reproduzierbarkeit nach. Allerdings können die genauen Grenzen der optimalen Konzentration des dotierten Metalls von dem dotierten Metall abhängen. Generell wird ein Bereich von 10 bis 80 Massen-%, insbesondere 18 bis 65 Massen-% des dotierten Metalls als vorteilhaft angesehen. According to the invention, a coin blank comprises a core of an iron material and a nickel layer into which a very finely divided doping of the antimicrobially active metals copper, silver, zinc, tin is introduced on the surface and near the surface. The doping has a penetration depth in the nickel layer of 0.5 to 10 μιη. On the surface, the nickel layer contains less than 100% by mass of the doped metal, for example 18 to 65% by mass of copper, the remainder being nickel. At a concentration higher than 65 mass% outweighs the unwanted color change, for example, from silver to reddish color with copper doping. At a concentration of less than 18% by mass, the antimicrobial effect and the reproducibility diminish. However, the exact limits of the optimum concentration of the doped metal may depend on the doped metal. In general, a range of 10 to 80% by mass, in particular 18 to 65% by mass, of the doped metal is considered to be advantageous.
Verfahrensgemäß wird auf den Eisenkern mit einer Nickelschicht üblicher Dicke eine Kupferschicht von 0,5μπι bis ΙΟμπι galvanisch aufgebracht. Anschließend wird der Münzrohling 0,5-2h bei Temperatur von 400 bis 1200°C geglüht, wodurch die erfindungsgemäße Dotierung der Oberfläche der Nickelschicht mit Kupfer erzielt wird. Überraschenderweise wird die ursprünglich geschlossene Kupferschicht aufgelöst und dringt als Dotierung vollständig in die Nickelschicht ein. Kupfer ist nicht mehr als getrennte Schicht vorhanden, sondern es ist als Dotierung von 2 - 20 Massen-% Cu in der Nickelschicht nachweisbar. Die Konzentration der Dotierung in der Nickelschicht nimmt von der Oberfläche des Münzrohlings zum Kern hin kontinuierlich ab. Der Nickelglanz bleibt erhalten und gleichzeitig sind die antimikrobiellen Eigenschaften des Kupfers wirksam. Erfindungsgemäß ist eine Dotierung der Nickelschicht mit einem anderen Metall aus der Reihe der bekanntermaßen antimikrobiell wirksamen Metalle, wie Silber, Zink, Zinn, zusätzlich zu oder anstelle von Kupfer möglich. Die Vorteile solcher Münzen, die aus einem erfindungsgemäßen Münzrohling (coin blank) geprägt sind, bestehen darin, dass erstens der ästhetische Glanz der Nickelschicht auch im Langzeitumlauf der Münzen dauerhaft erhalten bleibt und dass eine Verfärbung durch Oxidation von Kupfer oder durch Anlaufen von Silber nicht eintritt. Es wird eine Münze mit einer Nickelschicht bereitgestellt, die die antimikrobiellen Eigenschaften von Kupfer, Silber, Zink, Zinn in Form einer geringen Dotierung im Oberflächenbereich der Nickelschicht besitzt. Es hat sich überraschenderweise gezeigt, dass eine erfindungsgemäß geringe Dotierung der oberflächennahen Zone der Nickelschicht eine hohe Effizienz besitzt bezüglich der antimikrobiellen Wirkung der letztendlich aus dem erfindungsgemäßen Münzrohling geprägten Umlaufmünzen. According to the method, a copper layer of 0.5μπι to ΙΟμπι galvanically applied to the iron core with a nickel layer of conventional thickness. Subsequently, the coin blank is annealed for 0.5-2h at a temperature of 400 to 1200 ° C, whereby the doping of the surface of the nickel layer according to the invention with copper is achieved. Surprisingly, the originally closed copper layer is dissolved and penetrates as doping completely into the nickel layer. Copper is no longer present as a separate layer, but it is detectable as a doping of 2 - 20 mass% Cu in the nickel layer. The concentration of doping in the nickel layer decreases continuously from the surface of the coin blank to the core. The nickel gloss is retained and at the same time the antimicrobial properties of the copper are effective. According to the invention doping of the nickel layer with another metal from the series of known antimicrobial metals, such as silver, zinc, tin, in addition to or instead of copper is possible. The advantages of such coins, which are embossed from a coin blank according to the invention, consist in the fact that, firstly, the aesthetic gloss of the nickel layer is permanently retained even in the long-term circulation of the coins, and discoloration due to oxidation of copper or tarnishing of silver does not occur , A coin is provided with a nickel layer having the antimicrobial properties of copper, silver, zinc, tin in the form of a low doping in the surface region of the nickel layer. It has surprisingly been found that a low doping according to the invention of the near-surface zone of the nickel layer has a high efficiency with respect to the antimicrobial effect of the circulating coins ultimately embossed from the coin blank according to the invention.
Der erfindungsgemäße Münzrohling ermöglicht das Prägen von Umlaufmünzen einer neuen Qualität, nämlich von Münzen mit einem Kern aus einem Eisenwerkstoff, die einen hellen Glanz durch eine Nickelbeschichtung zeigen und die gleichzeitig die antimikrobiellen Eigenschaften von Kupfer oder Silber u.a. besitzen. The coin blank according to the invention enables coinage of a new quality, namely coins with a core made of a ferrous material, which show a bright shine through a nickel coating and at the same time the antimicrobial properties of copper or silver u.a. have.
Die erfinderische Lösung schließt Rohlinge für Gedenkprägungen, Medaillen und ähnliche Anwendungsfälle nicht aus. Ebenso sind Gegenstände, die eine Oberfläche aus Nickel oder aus einer kupferfreien Nickellegierung besitzen, erfindungsgemäß mit Kupfer, Silber, Zink oder Zinn dotierbar, wie z.B. Griffe, Türklinken, Beschläge u.a. The inventive solution does not exclude blanks for memorial embossing, medals and similar applications. Likewise, articles having a nickel or copper-free nickel alloy surface are, according to the invention, dopable with copper, silver, zinc or tin, e.g. Handles, doorknobs, fittings u.a.
Die Erfindung betrifft somit weiterhin einen Gegenstand mit einer Oberfläche aus einem nickelhaltigen Material, dadurch gekennzeichnet, dass das nickelhaltige Material an der Oberfläche eine Dotierung mindestens eines Metalls aus der Reihe der Metalle Kupfer, Silber, Zink, Zinn aufweist. Dabei kann das nickelhaltige Material Nickel oder eine Nickellegierung sein. Nickellegierung kann beispielsweise mit anderen Metallen außer Kupfer, Silber, Zink, Zinn gebildet werden. The invention thus furthermore relates to an article having a surface made of a nickel-containing material, characterized in that the nickel-containing material has on the surface a doping of at least one metal from the series of the metals copper, silver, zinc, tin. In this case, the nickel-containing material may be nickel or a nickel alloy. For example, nickel alloy can be formed with metals other than copper, silver, zinc, tin.
Die Erfindung wird nachstehend an einem Ausführungsbeispiel näher erläutert: The invention is explained in more detail below using an exemplary embodiment:
Fig. 1 zeigt den Querschnitt durch einen erfindungsgemäßen Münzrohling (coin blank). Fig. 1 shows the cross section through a coin blank according to the invention (coin blank).
1 - Stahlkern  1 - steel core
2 - galvanische Nickelschicht  2 - galvanic nickel layer
3 - Kupferdotierung in der Nickelschicht Der Münzrohling umfasst einen Kern / aus einem für Münzprägungen üblichen, niedriglegierten Stahl, der mit einer galvanisch aufgebrachten Nickelschicht 2 von 30μπι Stärke beschichtet ist, in die eine Kupferdotierung 3 mit atomarer Verteilung oberflächlich und oberflächenah eingebracht ist. Die Kupferdotierung 3 besitzt eine Eindringtiefe von 5 πι in die Nickelschicht 2 und weist ein degressives Konzentrationsgefälle innerhalb der Nickel Schicht 2 auf. 3 - Copper doping in the nickel layer The coin blank comprises a core / of a customary for Münzprägungen low-alloy steel, which is coated with a plated nickel layer 2 of 30μπι strength, in which a copper doping 3 is introduced with atomic distribution superficial and surface. The copper doping 3 has a penetration depth of 5 πι in the nickel layer 2 and has a degressive concentration gradient within the nickel layer 2.
Fig. 2a zeigt einen Querschnitt durch einen üblichen, mit Nickel beschichteten Münzrohling als Stand der Technik Fig. 2a shows a cross section through a conventional, nickel-coated coin blank as prior art
Fig. 2b zeigt den Querschnitt durch einen erfindungsgemäßen Münzrohling mit dem Konzentrationsverlauf der Kupferdotierung 3 in der Nickelschicht 2.  2b shows the cross section through a coin blank according to the invention with the concentration profile of the copper doping 3 in the nickel layer 2.
Es folgen 2 Blatt Zeichnungen This is followed by 2 sheets of drawings

Claims

Patentansprüche claims
1. Münzrohling mit einem Kern aus einem Eisen Werkstoff, der mit einer Nickelschicht versehen ist, dadurch gekennzeichnet, dass die Nickelschicht (2) an der Oberfläche eine Dotierung (3) mindestens eines Metalls aus der Reihe der Metalle Kupfer, Silber, Zink, Zinn aufweist. 1. Coin blank having a core of an iron material, which is provided with a nickel layer, characterized in that the nickel layer (2) on the surface doping (3) of at least one metal from the series of metals copper, silver, zinc, tin having.
2. Münzrohling nach Anspruch 1, dadurch gekennzeichnet, dass die Dotierung (3) des Metalls in der Nickelschicht (2) eine Eindringtiefe von 0,5 bis 10 μηι aufweist. 2. Coin blank according to claim 1, characterized in that the doping (3) of the metal in the nickel layer (2) has a penetration depth of 0.5 to 10 μηι.
3. Münzrohling nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Dotierung (3) des Metalls in der Nickelschicht (2) mit zunehmendem Abstand von der Oberfläche der Nickelschicht (2) kontinuierlich abnimmt. 3. Coin blank according to claim 1 or 2, characterized in that the doping (3) of the metal in the nickel layer (2) with increasing distance from the surface of the nickel layer (2) decreases continuously.
4. Münzrohling nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Nickelschicht (2) mit Kupfer dotiert ist und die Kupferdotierung an der Oberfläche der Nickelschicht (2) eine Konzentration von 18 bis 65 Massen-% Kupfer besitzt. 4. Coin blank according to one of claims 1 to 3, characterized in that the nickel layer (2) is doped with copper and the copper doping on the surface of the nickel layer (2) has a concentration of 18 to 65% by mass of copper.
5. Verfahren zur Herstellung eines Münzrohlings mit einem Kern aus einem Eisenwerkstoff, auf dem eine Nickelschicht aufgebracht ist, dadurch gekennzeichnet, dass auf der Nickelschicht eine Metallschicht von 0,5μπι bis ΙΟμπι aus der Gruppe, die aus Kupfer, Silber, Zink und Zinn besteht, aufgebracht wird und die Metallschicht anschließend durch thermische Behandlung des Münzrohlings in eine Dotierung der oberflächennahen Bereiche der Nickelschicht umgesetzt wird. 5. A method for producing a coin blank with a core of a ferrous material, on which a nickel layer is applied, characterized in that on the nickel layer, a metal layer of 0,5μπι to ΙΟμπι from the group consisting of copper, silver, zinc and tin , Is applied and the metal layer is then reacted by thermal treatment of the coin blank in a doping of the near-surface regions of the nickel layer.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die thermische Behandlung bei 400 - 1200°C in einer Schutzatmosphäre erfolgt. 6. The method according to claim 5, characterized in that the thermal treatment is carried out at 400 - 1200 ° C in a protective atmosphere.
7. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Dauer der thermischen Behandlung 0,5 - 2 h beträgt. 7. The method according to claim 5 or 6, characterized in that the duration of the thermal treatment is 0.5 - 2 h.
EP12706201.6A 2012-02-27 2012-02-27 Coin blank and method for the production thereof Not-in-force EP2819539B1 (en)

Applications Claiming Priority (1)

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PCT/EP2012/000842 WO2013127405A1 (en) 2012-02-27 2012-02-27 Coin blank and method for the production thereof

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EP2819539A1 true EP2819539A1 (en) 2015-01-07
EP2819539B1 EP2819539B1 (en) 2016-04-27

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EP (1) EP2819539B1 (en)
CA (1) CA2866193A1 (en)
RU (1) RU2014134922A (en)
WO (1) WO2013127405A1 (en)
ZA (1) ZA201406070B (en)

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Publication number Priority date Publication date Assignee Title
CN107299369B (en) * 2016-04-15 2019-08-20 南京造币有限公司 A kind of surface cladding cupro-nickel coin class product and its manufacturing method
IT201700031070A1 (en) * 2017-03-21 2018-09-21 Aquasan S R L Silver ion release sterilization device, a process for making said device and filtering apparatus including said device

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Publication number Priority date Publication date Assignee Title
US4279968A (en) * 1979-04-20 1981-07-21 Sherritt Gordon Mines Limited Coins and similarly disc-shaped articles
CA2013639C (en) * 1990-04-02 1998-06-23 Mitsuhiro Yasuda Electroplated blank for coins, medallions and tokens
CA2019568C (en) 1990-06-21 1998-11-24 Hieu C. Truong Coins coated with nickel, copper and nickel and process for making such coins
US20060286400A1 (en) * 2005-06-17 2006-12-21 Jarden Zinc Products, Inc. Substrate with alloy finish and method of making
DE102010044741A1 (en) * 2010-09-08 2012-03-08 Saxonia Eurocoin Gmbh Coin blank for manufacturing coin, comprises core made of ferrous material, which has cover layer made of nickel provided close to surface of finely dispersed copper doping

Non-Patent Citations (1)

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Title
See references of WO2013127405A1 *

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ZA201406070B (en) 2016-01-27
CA2866193A1 (en) 2013-09-06
RU2014134922A (en) 2016-04-20
WO2013127405A1 (en) 2013-09-06
EP2819539B1 (en) 2016-04-27

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