EP0450883B1 - Electroplated Blank for Coins, Medallions, Tokens or Tags - Google Patents

Electroplated Blank for Coins, Medallions, Tokens or Tags Download PDF

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Publication number
EP0450883B1
EP0450883B1 EP91302796A EP91302796A EP0450883B1 EP 0450883 B1 EP0450883 B1 EP 0450883B1 EP 91302796 A EP91302796 A EP 91302796A EP 91302796 A EP91302796 A EP 91302796A EP 0450883 B1 EP0450883 B1 EP 0450883B1
Authority
EP
European Patent Office
Prior art keywords
copper
blank
core
tin
electroplated
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.)
Expired - Lifetime
Application number
EP91302796A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0450883A3 (en
EP0450883A2 (en
Inventor
Mitshuhiro Yasuda
Michael John Harvey Ruscoe
Allan H. Lee
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.)
Viridian Inc Canada
Original Assignee
Sherritt Inc
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 Sherritt Inc filed Critical Sherritt Inc
Publication of EP0450883A2 publication Critical patent/EP0450883A2/en
Publication of EP0450883A3 publication Critical patent/EP0450883A3/en
Application granted granted Critical
Publication of EP0450883B1 publication Critical patent/EP0450883B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/005—Jewels; Clockworks; Coins

Definitions

  • This invention relates to metal alloy coins, medallions, tokens or tags and to blanks therefor, having improved wear resistance compared to copper coins while maintaining a cupric lustre and appearance.
  • the integrity of the coins is frequently judged by the general public by their appearance which is expected to be of a lustre of gold, silver or copper, depending on their face value. It is important that the coins do not change colour with age or otherwise corrode.
  • aureate coin and coin blanks having an electroplated coating on a metal core, the coating containing about 8 to 16%, preferably about 11 to 14%, by weight tin, the balance copper.
  • the coating thickness on the core faces is about 10 to 150 ⁇ m, preferably about 30 to 50 ⁇ m.
  • the coins and blanks have a golden appearance and are suitable for replacement of gold coins.
  • a coin, coin blank, medallion, medallion blank, token, token blank, tag or tag blank comprising: a core of mintable metallic material having a first surface bearing, or capable of bearing, a minted impression; and an electroplated coating of a copper-tin alloy completely encasing the core, the coating having a thickness, at least on the first surface, in the range of 5 ⁇ m to 50 ⁇ m; characterised in that the electroplated coating has a cupric lustre and appearance and the copper-tin alloy contains from 0.5% to 2.12% by weight tin with the balance, apart from incidental impurities, being copper.
  • tin-copper (bronze) alloy used in the present invention is believed to provide better protection to the core than pure copper due to a weaker galvanic corrosion couple between the metals and due to a more dense electrodeposit.
  • the copper-tin alloy contains 2% by weight tin with the balance, apart from incidental impurities, being copper.
  • the metallic material of the core is exemplified in the following examples as low carbon steel, it will be understood that the metallic core material may for example comprise iron, low carbon steel, stainless steel, nickel, nickel-plated steel, zinc, or alloys of zinc, copper or various alloys of copper containing zinc and/or nickel and/or tin, and aluminium or aluminium alloys suitably pretreated.
  • the core may be advantageously annealed before or after plating, to give the blank with electroplated coating a satisfactory low hardness for minting.
  • Annealing after electroplating is also advantageous in that it can be used to create a metallurgical bond by interdiffusion between the electroplated low-tin copper coating and the core material.
  • the electroplated blank is preferably annealed prior to minting by heating in a reducing atmosphere, e.g. in an atmosphere of hydrogen gas for up to 15 minutes at about 700°C.
  • a batch of rimmed coinage blanks made of low carbon steel and weighing 949 grams was loaded into a perforated, rotatable, horizontal plating barrel having a length of 15 cm and a diameter of 10 cm.
  • the barrel was first passed through a cleaning cycle consisting of sequential washes in a 10% detergent solution, cold water, 10% hydrochloric acid, and a second cold water wash.
  • the blanks were then immersed in an alkaline cyanide bronze plating bath containing copper, tin, potassium hydroxide and potassium cyanide.
  • a current of 15 amps was applied to the bath for approximately 1.8 hours while the temperature of the bath was maintained between about 55°C and 60°C.
  • the coinage blanks were annealed in a reducing atmosphere at 700°C for 15 minutes in the presence of hydrogen.
  • the coinage blanks were found to have an electrodeposit thickness of bronze on their faces of approximately 21 ⁇ m, and around their rims of approximately 30 ⁇ m.
  • Such coatings were found to be metallurgically bonded to the steel blanks and had a finer grain deposit and provided improved corrosion and wear resistance compared to pure copper similarly bonded.
  • B-B-S Bronze bonded steel
  • C-B-S copper bonded steel
  • C-B-S Canadian one cent coin blanks for corrosion resistance and wear resistance.
  • the coin blanks were immersed in a 2% NaCl bath for the corrosion test and tumbled in a rotating drum for the wear test.
  • Black rust spots were found only on the copper bonded steel samples. All rust spots were smaller than 1 mm in size.
  • the steel core blanks were sufficiently soft to take a clear impression from a mint die without causing undue wear on such dies.
  • the electrodeposited alloy coating exhibited sufficient surface hardness that the insignia minted thereon was not worn away after prolonged wear testing.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Adornments (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Freezers Or Refrigerated Showcases (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Electrotherapy Devices (AREA)
  • Paints Or Removers (AREA)
EP91302796A 1990-04-02 1991-03-28 Electroplated Blank for Coins, Medallions, Tokens or Tags Expired - Lifetime EP0450883B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2013639 1990-04-02
CA002013639A CA2013639C (en) 1990-04-02 1990-04-02 Electroplated blank for coins, medallions and tokens

Publications (3)

Publication Number Publication Date
EP0450883A2 EP0450883A2 (en) 1991-10-09
EP0450883A3 EP0450883A3 (en) 1992-12-30
EP0450883B1 true EP0450883B1 (en) 1996-05-22

Family

ID=4144644

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91302796A Expired - Lifetime EP0450883B1 (en) 1990-04-02 1991-03-28 Electroplated Blank for Coins, Medallions, Tokens or Tags

Country Status (12)

Country Link
EP (1) EP0450883B1 (ja)
JP (1) JP2826201B2 (ja)
KR (1) KR0139222B1 (ja)
AT (1) ATE138426T1 (ja)
AU (1) AU651338B2 (ja)
CA (1) CA2013639C (ja)
CZ (1) CZ281782B6 (ja)
DE (1) DE69119641T2 (ja)
FI (1) FI911535A (ja)
PL (2) PL167438B1 (ja)
RU (1) RU2091236C1 (ja)
ZA (1) ZA912174B (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2009202339B2 (en) * 2008-06-13 2011-09-29 Monnaie Royale Canadienne/ Royal Canadian Mint Control of electromagnetic signals of coins by multi-ply plating technology
WO2012075572A1 (en) * 2010-12-10 2012-06-14 Royal Canadian Mint Method to produce golden bronze by diffusion of tin into copper under controlled conditions

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2019568C (en) * 1990-06-21 1998-11-24 Hieu C. Truong Coins coated with nickel, copper and nickel and process for making such coins
DE4217778A1 (de) * 1992-05-29 1993-12-02 Deutsche Nickel Ag Verwendung einer Kupferbasislegierung als Münzwerkstoff
JP3290354B2 (ja) * 1996-07-05 2002-06-10 株式会社東芝 洗濯機及び洗濯機の駆動方法
US6656606B1 (en) 2000-08-17 2003-12-02 The Westaim Corporation Electroplated aluminum parts and process of production
US7296370B2 (en) * 2004-09-24 2007-11-20 Jarden Zinc Products, Inc. Electroplated metals with silvery-white appearance and method of making
KR100807847B1 (ko) * 2006-11-23 2008-02-27 한국조폐공사 주화용 적층 클래드판 및 그 제조방법
JP2014530293A (ja) * 2011-09-13 2014-11-17 モネ ロワイヤル カナディエンヌ／ロイヤル カナディアン ミントＭｏｎｎａｉｅ Ｒｏｙａｌｅ Ｃａｎａｄｉｅｎｎｅ／Ｒｏｙａｌ Ｃａｎａｄｉａｎ Ｍｉｎｔ アルミニウムのジンケート処理
WO2013109870A1 (en) * 2012-01-20 2013-07-25 Jarden Zinc Products, LLC Silvery- white material for use in coinage and token applications
CA2866193A1 (en) * 2012-02-27 2013-09-06 Saxonia Eurocoin Gmbh Coin blank and method for the production thereof
BR112015010511B1 (pt) * 2012-11-08 2020-12-15 Monnaie Royale Canadienne / Royal Canadian Mint Método de produção de um artigo tendo uma aparência de bronze dourado, substrato de múltiplas camadas e uso dos referidos método e substrato
RU2537689C1 (ru) * 2013-12-12 2015-01-10 Юлия Алексеевна Щепочкина Сплав для изготовления монет
KR101877483B1 (ko) * 2016-11-04 2018-07-12 서울시립대학교 산학협력단 금속 박막을 이용한 이종 귀금속의 접합 방법
WO2019113219A1 (en) * 2017-12-05 2019-06-13 Esco Group Llc Wear part and method of making the same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR743797A (ja) * 1931-10-19 1933-04-06
DE3116125C2 (de) * 1981-04-23 1983-02-10 Metallgesellschaft Ag, 6000 Frankfurt Verwendung einer Kupferlegierung als Werkstoff für goldfarbene Münzen
GB8305610D0 (en) * 1983-03-01 1983-03-30 Imi Kynoch Ltd Alloy
CA1219708A (en) * 1984-05-01 1987-03-31 Michael J.H. Ruscoe Aureate coins, medallions and tokens

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2009202339B2 (en) * 2008-06-13 2011-09-29 Monnaie Royale Canadienne/ Royal Canadian Mint Control of electromagnetic signals of coins by multi-ply plating technology
AU2009202339B8 (en) * 2008-06-13 2011-11-24 Monnaie Royale Canadienne/ Royal Canadian Mint Control of electromagnetic signals of coins by multi-ply plating technology
AU2009202339C1 (en) * 2008-06-13 2012-03-22 Monnaie Royale Canadienne/ Royal Canadian Mint Control of electromagnetic signals of coins by multi-ply plating technology
US9447515B2 (en) 2008-06-13 2016-09-20 Royal Canadian Mint Control of electromagnetic signals of coins through multi-ply plating technology
WO2012075572A1 (en) * 2010-12-10 2012-06-14 Royal Canadian Mint Method to produce golden bronze by diffusion of tin into copper under controlled conditions

Also Published As

Publication number Publication date
PL289677A1 (en) 1991-12-02
EP0450883A3 (en) 1992-12-30
DE69119641T2 (de) 1996-09-26
RU2091236C1 (ru) 1997-09-27
KR0139222B1 (ko) 1998-05-15
KR910017986A (ko) 1991-11-30
CS9100802A2 (en) 1991-11-12
PL166521B1 (pl) 1995-05-31
JP2826201B2 (ja) 1998-11-18
CA2013639C (en) 1998-06-23
PL167438B1 (pl) 1995-09-30
CZ281782B6 (cs) 1997-01-15
JPH0688289A (ja) 1994-03-29
ZA912174B (en) 1991-12-24
CA2013639A1 (en) 1991-10-02
ATE138426T1 (de) 1996-06-15
EP0450883A2 (en) 1991-10-09
DE69119641D1 (de) 1996-06-27
AU7394991A (en) 1991-10-03
AU651338B2 (en) 1994-07-21
FI911535A (fi) 1991-10-03
FI911535A0 (fi) 1991-03-28

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