CA2013639C - Electroplated blank for coins, medallions and tokens - Google Patents
Electroplated blank for coins, medallions and tokensInfo
- Publication number
- CA2013639C CA2013639C CA002013639A CA2013639A CA2013639C CA 2013639 C CA2013639 C CA 2013639C CA 002013639 A CA002013639 A CA 002013639A CA 2013639 A CA2013639 A CA 2013639A CA 2013639 C CA2013639 C CA 2013639C
- Authority
- CA
- Canada
- Prior art keywords
- copper
- coin
- metallic material
- blank
- face
- 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
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
- C25D7/00—Electroplating characterised by the article coated
- C25D7/005—Jewels; Clockworks; Coins
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)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Paints Or Removers (AREA)
- Electrotherapy Devices (AREA)
Abstract
An electroplated blank capable of having insignia minted on at least one face to form coins, medallions or tokens, the blank having opposed faces and a peripheral side edge and an electroplated coating comprising 0.5 to 4% by weight tin, the balance copper, completely enveloping said blank. The coating forms a thickness of from about 5 µm to about 50 µm on at least said face to be minted.
Description
~013639 RA~ Ouhv OF TNE ~ ON
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 alloy or copper plated or clad coins while maintaining a cupric luster and appearance.
In recent years, the rising cost of coinage metals has encouraged many countries to strike relatively ~n~Yr~ncive alloy coins in an effort to obtain reduced production costs. Various alloys of copper and zinc as well as nickel, aluminum and other metals have been used with varying success.
The integrity of the coins is frequently judged by the general public by their appearance which is expected to be of a luiter or colour of gold, silver or copper, depen~in~ on their face value. It is desirable that the coins do not change colour with age or otherwise corrode.
In addition to avoiding these undesirable features, any new coin should also be of an acceptable weight and may require certain electrical and magnetic properties to permit them to be acceptable for use in vending machines.
~3639 Other materials requirements for coins are that ~hey must not be easy to counterfeit, should provide specific properties for coin selection devices, must be capable of taking a good minting impression while having a sufficient surface hardness after minting to avoid undue wear, and should be inexpensive.
Canadian Patent No. 1,219,708 issued March 31, 1987 and U.S. Patent No. 4,579,761 issued April 1, 1986 disclose a process for producing an aureate coin and coin blank having an electroplated coating cont~i ni ng 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.
Because of the high cost of the refined copper, coinaqe bronze, defined as an alloy group containing greater than 95% copper, with 1 to 4% zinc and 0 to 1 tin and having a characteristic copper red colour, or other copper alloy coins currently in use, are expensive.
The seigniorage, which is the difference between the face value of the coin and its production cost, accordingly becomes small or of deficit value. The use of pure copper plating on steel or zinc cores has been found to produce coins subject to corrosion or wear problems. This was believed to be due to the coarse grain size, deposit porosity and the inherent poor wear resistance of such copp~r.
It is therefore an object of this invention to provide a coin with satisfactory corrosion and wear resistance which is relatively inexpensive to produce and has a copper lustre and appearance suitable for replacement of coins of coinage bronze alloy which are relatively expensive.
It is an object of another aspect of the invention to provide a copper alloy coin having suitable characteristics for use in coin operated vending machines.
SU~MA~Y OF T~E lNvk..~lON
In accordance with the present invention, a low tin bronze alloy, bonded to a core blank, has a finer grained den~er deposit than copper coatings and thus provides better corrosion resistance. The tin-copper alloy provided is believed to provide better protection than pure copper to a core such as a ~teel substrate due to a weaker galvanic corrosion couple between the metals, and due to a more dense electrodeposit.
The addition of tin in the range of 0.5 to 8%
greatly increases the resistance of the alloy coating to wear when used as a circulating coin.
The foregoing and other objects of the invention are obtained by means of an electroplated blank capable of having an insignia minted on at least one face, comprising: a core blank o~ a first metallic 20~3639 material, said core blank having opposed faces and a peripheral side edge, at least one of said faces being impressionable by a mint die, and an electroplated coating of a second metallic material completely 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 from about 0.5% up to a~out 8.0%
by weight, preferably about 2~ to 8%, with the balance being copper and incidental impurities.
Such objects are produced by ~eans of a process comprising: providing a core blank of a first metallic material and of a prescribed size, with opposed face and a peripheral side edge, at least one of said faces being impressionable by a mint die, and electroplating said core blank with a second metallic material to completely encase said blank and thereby provide a surface thickness of from about 5 ~m to about 50 ~m on at least said impressionable face, said second metallic material having a tin content of from about 0.5% up to about 8.0% by weight, preferably about 2% to 8%, with the balance being copper and incidental impurities.
BRIEF D~SCRIPTION OF THE DRAWING
The process of the invention and the products produced thereby will now be described with reference to the following examples and the accompanying drawings, in which:
Figure 1 is a cross-section showing the microstructure of annealed copper bonded steel (C-B-S) and of bronze bonded steel (B-B-S) produced according to the process of the invention; and Figure 2 is a graph showing thickness loss as a result of wear over time.
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 alloy or copper plated or clad coins while maintaining a cupric luster and appearance.
In recent years, the rising cost of coinage metals has encouraged many countries to strike relatively ~n~Yr~ncive alloy coins in an effort to obtain reduced production costs. Various alloys of copper and zinc as well as nickel, aluminum and other metals have been used with varying success.
The integrity of the coins is frequently judged by the general public by their appearance which is expected to be of a luiter or colour of gold, silver or copper, depen~in~ on their face value. It is desirable that the coins do not change colour with age or otherwise corrode.
In addition to avoiding these undesirable features, any new coin should also be of an acceptable weight and may require certain electrical and magnetic properties to permit them to be acceptable for use in vending machines.
~3639 Other materials requirements for coins are that ~hey must not be easy to counterfeit, should provide specific properties for coin selection devices, must be capable of taking a good minting impression while having a sufficient surface hardness after minting to avoid undue wear, and should be inexpensive.
Canadian Patent No. 1,219,708 issued March 31, 1987 and U.S. Patent No. 4,579,761 issued April 1, 1986 disclose a process for producing an aureate coin and coin blank having an electroplated coating cont~i ni ng 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.
Because of the high cost of the refined copper, coinaqe bronze, defined as an alloy group containing greater than 95% copper, with 1 to 4% zinc and 0 to 1 tin and having a characteristic copper red colour, or other copper alloy coins currently in use, are expensive.
The seigniorage, which is the difference between the face value of the coin and its production cost, accordingly becomes small or of deficit value. The use of pure copper plating on steel or zinc cores has been found to produce coins subject to corrosion or wear problems. This was believed to be due to the coarse grain size, deposit porosity and the inherent poor wear resistance of such copp~r.
It is therefore an object of this invention to provide a coin with satisfactory corrosion and wear resistance which is relatively inexpensive to produce and has a copper lustre and appearance suitable for replacement of coins of coinage bronze alloy which are relatively expensive.
It is an object of another aspect of the invention to provide a copper alloy coin having suitable characteristics for use in coin operated vending machines.
SU~MA~Y OF T~E lNvk..~lON
In accordance with the present invention, a low tin bronze alloy, bonded to a core blank, has a finer grained den~er deposit than copper coatings and thus provides better corrosion resistance. The tin-copper alloy provided is believed to provide better protection than pure copper to a core such as a ~teel substrate due to a weaker galvanic corrosion couple between the metals, and due to a more dense electrodeposit.
The addition of tin in the range of 0.5 to 8%
greatly increases the resistance of the alloy coating to wear when used as a circulating coin.
The foregoing and other objects of the invention are obtained by means of an electroplated blank capable of having an insignia minted on at least one face, comprising: a core blank o~ a first metallic 20~3639 material, said core blank having opposed faces and a peripheral side edge, at least one of said faces being impressionable by a mint die, and an electroplated coating of a second metallic material completely 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 from about 0.5% up to a~out 8.0%
by weight, preferably about 2~ to 8%, with the balance being copper and incidental impurities.
Such objects are produced by ~eans of a process comprising: providing a core blank of a first metallic material and of a prescribed size, with opposed face and a peripheral side edge, at least one of said faces being impressionable by a mint die, and electroplating said core blank with a second metallic material to completely encase said blank and thereby provide a surface thickness of from about 5 ~m to about 50 ~m on at least said impressionable face, said second metallic material having a tin content of from about 0.5% up to about 8.0% by weight, preferably about 2% to 8%, with the balance being copper and incidental impurities.
BRIEF D~SCRIPTION OF THE DRAWING
The process of the invention and the products produced thereby will now be described with reference to the following examples and the accompanying drawings, in which:
Figure 1 is a cross-section showing the microstructure of annealed copper bonded steel (C-B-S) and of bronze bonded steel (B-B-S) produced according to the process of the invention; and Figure 2 is a graph showing thickness loss as a result of wear over time.
2~:~ 3:~39 DESCRIPTION OF ln~ ~h~r~KK~ EMBODINENT
Although the prece~i ng description and the following examples make reference to coin blanks, it will be understood that the term "coin" u~ed herein in the specification and claims is intended to include coins, medallions and tokens and blanks therefor. Also, although the metallic material of ~he core blank is exemplified in the following examples as low carbon steel, it will be understood that the ~etallic 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, magnesium and magnesium alloys, and aluminum or aluminum alloys suitably pretreated.
The core blank must be soft enough to be deformed by coin dies dùring minting and the core may be advantageously annealed before or after plating to give the blank with the 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 c~re material. If the core material is already soft enough for minting, as with zinc, annealing may be omitted.
The said core may be burnished before or after annealing, to give the blan~ with the electroplated coating a satisfactory luster.
~ 3~39 E:Xa~LE 1 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 passe~ 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 contained in the plating barrel 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 maintai~e~ between about 55~C
and 60~C.
When removed from the bath, the total mass of coinage blanks was found to have increased by 58.7 gramS, equivalent to 5.83% of the total charge weight of the blanks. A wet analysis of the blanks showed the blanks to have a deposit containing 2.12% tin by weight.
After plating, 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.
2~3~3~
Such coatings were found to be metallurgically bonded to the steel blanks, and had a finer grain deposit than pure copper similarly bonded and annealed, as shown by the microstructures in Figure 1 for bronze bonded steel (B-B-S) and copper bonded steel (C-B-S) respectively.
Bronze bonded steel coinage blanks prepared according to the process of the present invention were evaluated with copper bonded steel blanks and Canadian one cent coin blanks for corrosion resistance and for wear resistance.
2~)~363~
.
The parameters of the coinage test sample8 are shown ~n Table 1.
. Table 1 D2posit Diameter Thic~necs W~ight Thk Wt Co~p'n Sample (mm) (mm)(g) ~m % %
C-B-S 18.S6 0.982.22 Face:21 5.78~00 Cu Edge:30 B-B-S 18.57 0.982.22 Face:21 5.832.1 Sn Edge:31 97.9 Cu Cdn. 1~ 19.05 1.382.50 N/A N/A1 5 Zn 98.0 ~u.
In the corrosion test, coins or blanks were immersed in a 2% NaCl solution for 4 hours. The results o~ a co~,osion test co~lcted on 10 samples of each blank type are shown in Table 2.
Table 2 Sample On Faces on Edqe C-B-S 11 rust spots/l~ blanks 7 rust spots/10 blan~s B-8-S 0/10 blanks 0~10 blanks 0/10 coins 0/10 coins Canadian l¢
~36~9 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. In this test, 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 lo~d; n~ hole on one side. At the start, 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.
In general, the bronze bonded steel blanks were superior to the copper bonded steel blanks in both corrosion and wear tests.
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.
201~639 While this invention is particularly suitable for producing coins to be used as legal tender, it will be understood that it is beneficial in the production of medallions, tokens and metallic tags as well. Other embodiments of the invention will be readily apparent to a person skilled in the art, the scope of the invention being defined by the appended claims.
Although the prece~i ng description and the following examples make reference to coin blanks, it will be understood that the term "coin" u~ed herein in the specification and claims is intended to include coins, medallions and tokens and blanks therefor. Also, although the metallic material of ~he core blank is exemplified in the following examples as low carbon steel, it will be understood that the ~etallic 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, magnesium and magnesium alloys, and aluminum or aluminum alloys suitably pretreated.
The core blank must be soft enough to be deformed by coin dies dùring minting and the core may be advantageously annealed before or after plating to give the blank with the 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 c~re material. If the core material is already soft enough for minting, as with zinc, annealing may be omitted.
The said core may be burnished before or after annealing, to give the blan~ with the electroplated coating a satisfactory luster.
~ 3~39 E:Xa~LE 1 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 passe~ 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 contained in the plating barrel 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 maintai~e~ between about 55~C
and 60~C.
When removed from the bath, the total mass of coinage blanks was found to have increased by 58.7 gramS, equivalent to 5.83% of the total charge weight of the blanks. A wet analysis of the blanks showed the blanks to have a deposit containing 2.12% tin by weight.
After plating, 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.
2~3~3~
Such coatings were found to be metallurgically bonded to the steel blanks, and had a finer grain deposit than pure copper similarly bonded and annealed, as shown by the microstructures in Figure 1 for bronze bonded steel (B-B-S) and copper bonded steel (C-B-S) respectively.
Bronze bonded steel coinage blanks prepared according to the process of the present invention were evaluated with copper bonded steel blanks and Canadian one cent coin blanks for corrosion resistance and for wear resistance.
2~)~363~
.
The parameters of the coinage test sample8 are shown ~n Table 1.
. Table 1 D2posit Diameter Thic~necs W~ight Thk Wt Co~p'n Sample (mm) (mm)(g) ~m % %
C-B-S 18.S6 0.982.22 Face:21 5.78~00 Cu Edge:30 B-B-S 18.57 0.982.22 Face:21 5.832.1 Sn Edge:31 97.9 Cu Cdn. 1~ 19.05 1.382.50 N/A N/A1 5 Zn 98.0 ~u.
In the corrosion test, coins or blanks were immersed in a 2% NaCl solution for 4 hours. The results o~ a co~,osion test co~lcted on 10 samples of each blank type are shown in Table 2.
Table 2 Sample On Faces on Edqe C-B-S 11 rust spots/l~ blanks 7 rust spots/10 blan~s B-8-S 0/10 blanks 0~10 blanks 0/10 coins 0/10 coins Canadian l¢
~36~9 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. In this test, 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 lo~d; n~ hole on one side. At the start, 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.
In general, the bronze bonded steel blanks were superior to the copper bonded steel blanks in both corrosion and wear tests.
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.
201~639 While this invention is particularly suitable for producing coins to be used as legal tender, it will be understood that it is beneficial in the production of medallions, tokens and metallic tags as well. Other embodiments of the invention will be readily apparent to a person skilled in the art, the scope of the invention being defined by the appended claims.
Claims (27)
1. A corrosion and wear resistant electroplated blank having a copper lustre and appearance capable of having insignia minted on at least one face, comprising:
a core blank of a first metallic material, said core blank having opposed faces and a peripheral side edge, at least one of said faces being impressionable by a mint die, and an electroplated coating of a second metallic material completely 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 from about 0.5% to about 4.0%, by weight, with the balance being copper.
a core blank of a first metallic material, said core blank having opposed faces and a peripheral side edge, at least one of said faces being impressionable by a mint die, and an electroplated coating of a second metallic material completely 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 from about 0.5% to about 4.0%, by weight, with the balance being copper.
2. A blank as claimed in claim 1, in which said first metallic material is at least one selected from the group consisting of iron, low carbon steel, stainless steel, nickel, nickel-plated steel, zinc and zinc alloys, copper and copper alloys, magnesium and magnesium alloys, and pretreated aluminum and aluminum alloys.
3. A blank as claimed in claim 2, in which said second metallic material has a tin content of about 2% by weight, the balance being copper.
4. A corrosion and wear resistant electroplated coin having a copper lustre and appearance and insignia minted on at least one face, comprising:
a coin core blank having opposed faces and a peripheral side edge of a first metallic material which is soft enough to be deformed by coin dies during minting, and an electroplated coating of a second metallic material completely encasing said blank, which contains from about 0.5 to about 4% tin by weight, with the balance copper, and having a face thickness of from about 5~m to about 50~m, said insignia being formed by minting after the coating is electroplated.
a coin core blank having opposed faces and a peripheral side edge of a first metallic material which is soft enough to be deformed by coin dies during minting, and an electroplated coating of a second metallic material completely encasing said blank, which contains from about 0.5 to about 4% tin by weight, with the balance copper, and having a face thickness of from about 5~m to about 50~m, said insignia being formed by minting after the coating is electroplated.
5. A coin as claimed in claim 4, in which the first and the second metallic materials are metallurgically bonded by interdiffusion due to heat treatment.
6. A coin as claimed in claim 5, in which the first metallic material is at least one selected from the group consisting of iron, low carbon steel, stainless steel, nickel, nickel-plated steel, zinc and zinc alloys, copper and copper alloys, magnesium and magnesium alloys, and pretreated aluminum and aluminum alloys.
7. A coin as claimed in claim 5, in which the first metallic material comprises iron, low carbon steel or stainless steel.
8. A coin as claimed in claim 5, in which the first metallic material comprises nickel or nickel-plated steel.
9. A coin as claimed in claim 5, in which the first metallic material comprises zinc or zinc alloy.
10. A coin as claimed in claim 5, in which the first metallic material comprises copper or copper alloy.
11. A coin as claimed in claim 5, in which the first metallic material comprises magnesium or magnesium alloy.
12. A coin as claimed in claim 5, in which the first metallic material comprises aluminum or aluminum alloy.
13. A coin as claimed in claim 5, in which the first metallic material is low carbon steel and the second metallic material comprises about 2% tin by weight, the balance copper.
14. A corrosion and wear resistant electroplated coin having a copper lustre and appearance, capable of having an insignia minted on at least one face, comprising:
providing a core blank of a first metallic material and of a prescribed size, with opposed faces and a peripheral side edge, at least one of said faces being impressionable by a mint die, and an electroplated coating of a copper alloy completely encasing said core blank to provide a surface thickness on at least said impressionable face of from about 5~m to about 50~m, said copper alloy having a tin content of from about 0.5% to about 4% by weight, with the balance being copper, said insignia being minted on at least said impressionable face.
providing a core blank of a first metallic material and of a prescribed size, with opposed faces and a peripheral side edge, at least one of said faces being impressionable by a mint die, and an electroplated coating of a copper alloy completely encasing said core blank to provide a surface thickness on at least said impressionable face of from about 5~m to about 50~m, said copper alloy having a tin content of from about 0.5% to about 4% by weight, with the balance being copper, said insignia being minted on at least said impressionable face.
15. A coin as claimed in claim 14, in which said copper alloy coating and said core blank material are metallurgically bonded by interdiffusion due to heat treatment.
16. A process for producing a corrosion and wear resistant blank having a copper lustre and appearance capable of having an insignia minted on at least one face, comprising:
providing a core blank of a first metallic material and of a prescribed size, with opposed faces and a peripheral side edge, at least one of said faces being immpressionable by a mint die, and electroplating said core blank with a second metallic material to completely encase said core, blank to provide a surface thickness of from about 5~m to about 50~m on at least said impressionable face, said second metallic material having a tin content of from about 0.5%
to 4.0% by weight, with the balance being copper and incidental impurities.
providing a core blank of a first metallic material and of a prescribed size, with opposed faces and a peripheral side edge, at least one of said faces being immpressionable by a mint die, and electroplating said core blank with a second metallic material to completely encase said core, blank to provide a surface thickness of from about 5~m to about 50~m on at least said impressionable face, said second metallic material having a tin content of from about 0.5%
to 4.0% by weight, with the balance being copper and incidental impurities.
17. A process as claimed in claim 16, in which said core blank is subjected to a dilute acid rinse prior to electroplating.
18. A process as claimed in claim 16, in which the core blank is annealed prior to electroplating.
19. A process as claimed in claim 16, in which said core blank is annealed after electroplating to provide a metallurgical bond between the electrodeposited coating and the core material.
20. A process as claimed in claim 19 wherein said annealing is carried out in a reducing atmosphere for up to about 15 minutes at about 700°C.
21. A process for producing a corrosion and wear resistant electroplated coin having a copper lustre and appearance and a mint deformed insignia on at least one face, comprising:
providing a coin core blank of the desired size and shape having opposed faces and a peripheral side edge of a first metallic material which is soft enough to be readily deformed by coin dies during minting;
electroplating said coin blank with a coating of a second metallic material to completely encase said coin core blank with a coating having a face thickness of about m to about 50 m, said second metallic material comprising about 0.5 to about 4% tin by weight, with the balance copper, and forming insignia on said at least one face of the plated blank by at least one coin die deforming the surface thereof.
providing a coin core blank of the desired size and shape having opposed faces and a peripheral side edge of a first metallic material which is soft enough to be readily deformed by coin dies during minting;
electroplating said coin blank with a coating of a second metallic material to completely encase said coin core blank with a coating having a face thickness of about m to about 50 m, said second metallic material comprising about 0.5 to about 4% tin by weight, with the balance copper, and forming insignia on said at least one face of the plated blank by at least one coin die deforming the surface thereof.
22. The process of claim 21, including the step of softening the coin blank by annealing prior to electroplating.
23. The process of claim 22, including the step of softening the coin blank by annealing after plating and prior to forming the insignia thereon.
24. The process of claims 19, 20 or 23 in which the coin blank is annealed in the presence of hydrogen gas.
25. A process according to claims 16, 17, 18, 19, 20, 21, 22 or 23 in which said first metallic material is at least one selected from the group consisting of iron, low carbon steel, stainless steel, nickel, nickel-plated steel, zinc and zinc alloys, copper and copper alloys, magnesium and magnesium alloys, and pretreated aluminum and aluminum alloys.
26. A process as claimed in claim 25, in which said second metallic material has a tin content of about 2% by weight, the balance copper.
27. A process according to claim 16, 17, 18, 19 or 20 including minting an insignia on said coated impressionable face.
Priority Applications (13)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002013639A CA2013639C (en) | 1990-04-02 | 1990-04-02 | Electroplated blank for coins, medallions and tokens |
| ZA912174A ZA912174B (en) | 1990-04-02 | 1991-03-22 | Electroplated blank for coins,medallions and tokens |
| CS91802A CZ281782B6 (en) | 1990-04-02 | 1991-03-26 | Coin, and process for producing thereof |
| DE69119641T DE69119641T2 (en) | 1990-04-02 | 1991-03-28 | Electroplated blank for coins, medallions, tokens or badges |
| FI911535A FI911535A (en) | 1990-04-02 | 1991-03-28 | GALVANISERADE AEMNEN FOER MYNT, MEDALJER OCH POLLETTER. |
| AT91302796T ATE138426T1 (en) | 1990-04-02 | 1991-03-28 | ELECTROPLATED BLANK FOR COINS, MEDALLIONS, TOKENS OR PLAQUES |
| EP91302796A EP0450883B1 (en) | 1990-04-02 | 1991-03-28 | Electroplated Blank for Coins, Medallions, Tokens or Tags |
| PL91302291A PL167438B1 (en) | 1990-04-02 | 1991-03-29 | Coin and method of making same |
| PL91289677A PL166521B1 (en) | 1990-04-02 | 1991-03-29 | Method of making coin blanks, coin blank as well as method of making coins and coin made thereby |
| SU4895147/02A RU2091236C1 (en) | 1990-04-02 | 1991-04-01 | Corrosion and wear resistant stock and corrosion and wear resistant coins and methods of manufacturing thereof |
| JP3096391A JP2826201B2 (en) | 1990-04-02 | 1991-04-01 | Money, money blank, medallion, medallion blank, token, token blank, tag or tag blank having luster and appearance of copper and method of manufacturing the same |
| AU73949/91A AU651338B2 (en) | 1990-04-02 | 1991-04-02 | Electroplated blank for coins, medallions and tokens |
| KR1019910005298A KR0139222B1 (en) | 1990-04-02 | 1991-04-02 | Electroplated blank for coins, medallions and tokens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002013639A CA2013639C (en) | 1990-04-02 | 1990-04-02 | Electroplated blank for coins, medallions and tokens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2013639A1 CA2013639A1 (en) | 1991-10-02 |
| CA2013639C true CA2013639C (en) | 1998-06-23 |
Family
ID=4144644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002013639A Expired - Lifetime CA2013639C (en) | 1990-04-02 | 1990-04-02 | Electroplated blank for coins, medallions and tokens |
Country Status (12)
| Country | Link |
|---|---|
| EP (1) | EP0450883B1 (en) |
| JP (1) | JP2826201B2 (en) |
| KR (1) | KR0139222B1 (en) |
| AT (1) | ATE138426T1 (en) |
| AU (1) | AU651338B2 (en) |
| CA (1) | CA2013639C (en) |
| CZ (1) | CZ281782B6 (en) |
| DE (1) | DE69119641T2 (en) |
| FI (1) | FI911535A (en) |
| PL (2) | PL167438B1 (en) |
| RU (1) | RU2091236C1 (en) |
| ZA (1) | ZA912174B (en) |
Families Citing this family (15)
| 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 (en) * | 1992-05-29 | 1993-12-02 | Deutsche Nickel Ag | Use of a copper-based alloy as a coin material |
| JP3290354B2 (en) * | 1996-07-05 | 2002-06-10 | 株式会社東芝 | Washing machine and driving method of washing machine |
| 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 (en) * | 2006-11-23 | 2008-02-27 | 한국조폐공사 | A clad plate for coin and manufacturing method thereof |
| MY150042A (en) | 2008-06-13 | 2013-11-29 | 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 |
| CA2848347C (en) * | 2011-09-13 | 2019-07-02 | Monnaie Royale Canadienne/Royal Canadian Mint | Zincating aluminum |
| WO2013109870A1 (en) * | 2012-01-20 | 2013-07-25 | Jarden Zinc Products, LLC | Silvery- white material for use in coinage and token applications |
| WO2013127405A1 (en) * | 2012-02-27 | 2013-09-06 | Saxonia Eurocoin Gmbh | Coin blank and method for the production thereof |
| RU2658775C2 (en) * | 2012-11-08 | 2018-06-22 | Монэ Руаяль Канадиен / Ройал Канадиан Минт | Enhanced technique for production of golden bronze by inter-diffusion of tin and copper under controlled conditions |
| RU2537689C1 (en) * | 2013-12-12 | 2015-01-10 | Юлия Алексеевна Щепочкина | Coin making alloy |
| KR101877483B1 (en) * | 2016-11-04 | 2018-07-12 | 서울시립대학교 산학협력단 | Method of uniting different kind of jewelries using metal thin-film |
| US20190169822A1 (en) * | 2017-12-05 | 2019-06-06 | Esco Group Llc | Wear part and method of making the same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR743797A (en) * | 1931-10-19 | 1933-04-06 | ||
| DE3116125C2 (en) * | 1981-04-23 | 1983-02-10 | Metallgesellschaft Ag, 6000 Frankfurt | Use of a copper alloy as a material for gold-colored coins |
| 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 |
-
1990
- 1990-04-02 CA CA002013639A patent/CA2013639C/en not_active Expired - Lifetime
-
1991
- 1991-03-22 ZA ZA912174A patent/ZA912174B/en unknown
- 1991-03-26 CZ CS91802A patent/CZ281782B6/en not_active IP Right Cessation
- 1991-03-28 EP EP91302796A patent/EP0450883B1/en not_active Expired - Lifetime
- 1991-03-28 AT AT91302796T patent/ATE138426T1/en not_active IP Right Cessation
- 1991-03-28 FI FI911535A patent/FI911535A/en not_active Application Discontinuation
- 1991-03-28 DE DE69119641T patent/DE69119641T2/en not_active Expired - Fee Related
- 1991-03-29 PL PL91302291A patent/PL167438B1/en not_active IP Right Cessation
- 1991-03-29 PL PL91289677A patent/PL166521B1/en not_active IP Right Cessation
- 1991-04-01 RU SU4895147/02A patent/RU2091236C1/en not_active IP Right Cessation
- 1991-04-01 JP JP3096391A patent/JP2826201B2/en not_active Expired - Fee Related
- 1991-04-02 AU AU73949/91A patent/AU651338B2/en not_active Ceased
- 1991-04-02 KR KR1019910005298A patent/KR0139222B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| JP2826201B2 (en) | 1998-11-18 |
| JPH0688289A (en) | 1994-03-29 |
| ATE138426T1 (en) | 1996-06-15 |
| CA2013639A1 (en) | 1991-10-02 |
| ZA912174B (en) | 1991-12-24 |
| PL166521B1 (en) | 1995-05-31 |
| FI911535A (en) | 1991-10-03 |
| KR910017986A (en) | 1991-11-30 |
| AU7394991A (en) | 1991-10-03 |
| KR0139222B1 (en) | 1998-05-15 |
| RU2091236C1 (en) | 1997-09-27 |
| PL167438B1 (en) | 1995-09-30 |
| CS9100802A2 (en) | 1991-11-12 |
| FI911535A0 (en) | 1991-03-28 |
| DE69119641D1 (en) | 1996-06-27 |
| EP0450883A2 (en) | 1991-10-09 |
| EP0450883B1 (en) | 1996-05-22 |
| DE69119641T2 (en) | 1996-09-26 |
| EP0450883A3 (en) | 1992-12-30 |
| AU651338B2 (en) | 1994-07-21 |
| CZ281782B6 (en) | 1997-01-15 |
| PL289677A1 (en) | 1991-12-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed | ||
| MKEC | Expiry (correction) |
Effective date: 20121202 |