EP0450883A2 - Elektroplattierter Rohling für Münzen, Medaillons, Wertmarken oder Plaketten - Google Patents

Elektroplattierter Rohling für Münzen, Medaillons, Wertmarken oder Plaketten Download PDF

Info

Publication number
EP0450883A2
EP0450883A2 EP91302796A EP91302796A EP0450883A2 EP 0450883 A2 EP0450883 A2 EP 0450883A2 EP 91302796 A EP91302796 A EP 91302796A EP 91302796 A EP91302796 A EP 91302796A EP 0450883 A2 EP0450883 A2 EP 0450883A2
Authority
EP
European Patent Office
Prior art keywords
core
blank
copper
electroplated
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
EP91302796A
Other languages
English (en)
French (fr)
Other versions
EP0450883A3 (en
EP0450883B1 (de
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 Gordon Mines Ltd
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 Gordon Mines Ltd, Sherritt Inc filed Critical Sherritt Gordon Mines Ltd
Publication of EP0450883A2 publication Critical patent/EP0450883A2/de
Publication of EP0450883A3 publication Critical patent/EP0450883A3/en
Application granted granted Critical
Publication of EP0450883B1 publication Critical patent/EP0450883B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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 or tokens and to blanks used for the production of coins, medallions or tokens. More particularly, this invention relates to said coins, blanks and medallions and to blanks for the production thereof having improved wear resistance compared to copper coins while maintaining a cupric lustre and appearance.
  • 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 15 ⁇ m, preferably about 30 to 50 ⁇ m.
  • the coins and blanks have a golden appearance and are suitable for replacement of gold coins.
  • coin and coin blanks comprising a low tin bronze alloy bonded to a metallic core, the bronze alloy having a fine grain structure which provides good corrosion and wear resistance.
  • the tin-copper (bronze) alloy used 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.
  • an electroplated coin blank capable of having an insignia minted on at least one face, comprising: a core blank of a first metallic material, preferably steel, said core blank having at least one face impressionable by a mint die, and an electroplated coating of a second metallic material encasing said core blank and providing a surface thickness on at least said impressionable face of from about 5 ⁇ m to about 50 ⁇ m, said second metallic material having a tin content of at least about 0.5% but less than 8.0% by weight, preferably in the range 2% up to but not including 8%, and most preferably about 2.0% with the balance being copper and incidental impurities.
  • the term "coin” used herein in the specification and claims is intended to include coins, medallions and tokens and blanks therefor.
  • the metallic material of the core blank 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 suitable 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.
  • the annealing before plating can be omitted.
  • the core may be burnished before or after annealing, in order to give the electroplated block a satisfactory lustre.
  • a bath of tinned 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 0.021 ⁇ m, and around their rims of approximately 0.030 ⁇ 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.
  • a rotating drum wear test was carried out on 16 samples of each blank type.
  • samples were tumbled in a rotating cylinder having a cloth lining backed by rubber, a hump on the circumference to tumble the pieces each revolution, and a loading hole on one side.
  • pieces were weighed, dipped in synthetic sweat solution, sealed into the cylinder and rotated, with the test cycle being repeated at 100 hour intervals.
  • the cumulative average surface thickness loss for the samples as a function of test duration up to 300 hours is shown in Figure 2.
  • the bronze bonded steel samples showed better wear resistance than the copper bonded steel blanks and Canadian one cent samples, while the latter two sample types had similar wear resistance over the 300 hour test period.
  • 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.

Landscapes

  • 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)
  • Paints Or Removers (AREA)
  • Electrotherapy Devices (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
EP91302796A 1990-04-02 1991-03-28 Elektroplattierter Rohling für Münzen, Medaillons, Wertmarken oder Plaketten Expired - Lifetime EP0450883B1 (de)

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

Family

ID=4144644

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91302796A Expired - Lifetime EP0450883B1 (de) 1990-04-02 1991-03-28 Elektroplattierter Rohling für Münzen, Medaillons, Wertmarken oder Plaketten

Country Status (12)

Country Link
EP (1) EP0450883B1 (de)
JP (1) JP2826201B2 (de)
KR (1) KR0139222B1 (de)
AT (1) ATE138426T1 (de)
AU (1) AU651338B2 (de)
CA (1) CA2013639C (de)
CZ (1) CZ281782B6 (de)
DE (1) DE69119641T2 (de)
FI (1) FI911535A7 (de)
PL (2) PL166521B1 (de)
RU (1) RU2091236C1 (de)
ZA (1) ZA912174B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4217778A1 (de) * 1992-05-29 1993-12-02 Deutsche Nickel Ag Verwendung einer Kupferbasislegierung als Münzwerkstoff
GB2245283B (en) * 1990-06-21 1994-12-14 Canadian Mint Coins coated with nickel, copper and nickel and process for making such coins
US6041625A (en) * 1996-07-05 2000-03-28 Kabushiki Kaisha Toshiba Washing machine with direct drive mechanism for rotatable tub and agitator
US7296370B2 (en) * 2004-09-24 2007-11-20 Jarden Zinc Products, Inc. Electroplated metals with silvery-white appearance and method of making
WO2013127405A1 (de) * 2012-02-27 2013-09-06 Saxonia Eurocoin Gmbh Münzrohling (coin blank) und verfahren zu seiner herstellung
US9540735B2 (en) 2011-09-13 2017-01-10 Royal Canadian Mint Zincating aluminum
WO2019113219A1 (en) * 2017-12-05 2019-06-13 Esco Group Llc Wear part and method of making the same

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6656606B1 (en) 2000-08-17 2003-12-02 The Westaim Corporation Electroplated aluminum parts and process of production
GB0419609D0 (en) * 2004-09-03 2004-10-06 Diffusion Alloys Ltd Process for the production of coin blanks
KR100807847B1 (ko) * 2006-11-23 2008-02-27 한국조폐공사 주화용 적층 클래드판 및 그 제조방법
SG158033A1 (en) * 2008-06-13 2010-01-29 Canadian Mint Control of electromagnetic signals of coins through multi-ply plating technology
CA2820745A1 (en) * 2010-12-10 2012-06-14 Royal Canadian Mint Method to produce golden bronze by diffusion of tin into copper under controlled conditions
WO2013109870A1 (en) * 2012-01-20 2013-07-25 Jarden Zinc Products, LLC Silvery- white material for use in coinage and token applications
MX387586B (es) * 2012-11-08 2025-03-18 Monnaie Royale Canadienne / Royal Canadian Mint Tecnicas mejoradas para la produccion de bronce dorado por interdifusion de estaño y cobre en condiciones controladas.
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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR743797A (de) * 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 (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2245283B (en) * 1990-06-21 1994-12-14 Canadian Mint 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
US6041625A (en) * 1996-07-05 2000-03-28 Kabushiki Kaisha Toshiba Washing machine with direct drive mechanism for rotatable tub and agitator
US7296370B2 (en) * 2004-09-24 2007-11-20 Jarden Zinc Products, Inc. Electroplated metals with silvery-white appearance and method of making
US9540735B2 (en) 2011-09-13 2017-01-10 Royal Canadian Mint Zincating aluminum
WO2013127405A1 (de) * 2012-02-27 2013-09-06 Saxonia Eurocoin Gmbh Münzrohling (coin blank) und verfahren zu seiner herstellung
WO2019113219A1 (en) * 2017-12-05 2019-06-13 Esco Group Llc Wear part and method of making the same

Also Published As

Publication number Publication date
RU2091236C1 (ru) 1997-09-27
EP0450883A3 (en) 1992-12-30
DE69119641T2 (de) 1996-09-26
CS9100802A2 (en) 1991-11-12
AU7394991A (en) 1991-10-03
CZ281782B6 (cs) 1997-01-15
JPH0688289A (ja) 1994-03-29
FI911535L (fi) 1991-10-03
CA2013639C (en) 1998-06-23
PL166521B1 (pl) 1995-05-31
KR910017986A (ko) 1991-11-30
KR0139222B1 (ko) 1998-05-15
CA2013639A1 (en) 1991-10-02
ATE138426T1 (de) 1996-06-15
PL289677A1 (en) 1991-12-02
FI911535A0 (fi) 1991-03-28
ZA912174B (en) 1991-12-24
AU651338B2 (en) 1994-07-21
DE69119641D1 (de) 1996-06-27
EP0450883B1 (de) 1996-05-22
FI911535A7 (fi) 1991-10-03
PL167438B1 (pl) 1995-09-30
JP2826201B2 (ja) 1998-11-18

Similar Documents

Publication Publication Date Title
EP0163419B1 (de) Goldene Münzen, Medaillons und Spielmarken und Verfahren zu ihrer Herstellung
EP0450883B1 (de) Elektroplattierter Rohling für Münzen, Medaillons, Wertmarken oder Plaketten
US4279968A (en) Coins and similarly disc-shaped articles
US4247374A (en) Method of forming blanks for coins
US4176014A (en) Process for the production of coin blanks
JPH01111895A (ja) 電解により設けられた、拡散深さの大きいニッケル被覆を持つ冷間圧延帯及びこの冷間圧延帯の製造方法
US4551184A (en) Process for obtaining a composite material and composite material obtained by said process
US7296370B2 (en) Electroplated metals with silvery-white appearance and method of making
US4505060A (en) Process for obtaining a composite material and composite material obtained by said process
CN85105261A (zh) 镀金硬币，徽章和代用币
CA1198073A (en) Process for producing coin blanks
EP0129391B1 (de) Verbundwerkstoff und seine Herstellung
CA1105210A (en) Coins and similarly disc-shaped articles
WO2006138033A2 (en) Substrate with alloy finish and method of making
CN1065426A (zh) 用于硬币、奖章及纪念章的电镀的坯料
GB1558803A (en) Coins and similarly discshaped articles
CA2580791C (en) Electroplated metals with silvery-white appearance and method of making
JPH06316773A (ja) 貴金属めっきの製造方法
GB2102708A (en) Process for producing coin blanks
CA1203723A (en) Process for obtaining a composite material and composite material obtained by said process
NO791197L (no) Mynter og lignende artikler.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19930630

17Q First examination report despatched

Effective date: 19940527

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SHERRITT INC.

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Effective date: 19960522

Ref country code: DK

Effective date: 19960522

Ref country code: BE

Effective date: 19960522

Ref country code: LI

Effective date: 19960522

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19960522

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19960522

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19960522

REF Corresponds to:

Ref document number: 138426

Country of ref document: AT

Date of ref document: 19960615

Kind code of ref document: T

ITF It: translation for a ep patent filed
REF Corresponds to:

Ref document number: 69119641

Country of ref document: DE

Date of ref document: 19960627

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19960822

ET Fr: translation filed
NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970331

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

Ref country code: FR

Ref legal event code: TP

Ref country code: FR

Ref legal event code: CA

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20030331

Year of fee payment: 13

Ref country code: FR

Payment date: 20030331

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20030627

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040328

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041001

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041130

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050328

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20090317

Year of fee payment: 19

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20100328

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100328