Coins coated with nickel, copper and nickel and process for making such coins
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United States of America Patent
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Sep 29, 1992
Issued Date -
N/A
app pub date -
Dec 4, 1991
filing date -
Jun 21, 1990
priority date (Note) -
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Abstract
This invention overcomes problems such as pinholes and blisters in making plated coin blanks and similar articles. A ferrous metal blank is electroplated with a strike of nickel, following which a coating of copper is applied at an initial low current density followed by full current density to minimize bridging. The low current density may be about 1/6 to 1/4 of the full current density. Preferably an outer layer of nickel is applied, also at an initial low current density, followed by full current density. Annealing before or after application of the final layer of nickel is advisable. This invention also relates to the resulting coin blank and coins.
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