Coins coated with nickel, copper and nickel
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United States of America Patent
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Aug 18, 1992
Issued Date -
N/A
app pub date -
Jun 28, 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. 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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