Asked by Lucy
Why are alloys used to make coins rather than the pure metal?
Answers
Answered by
drwls
Pure metals tend to be softer and wear faster. Actually, the penny is (since 1982) 97.5% zinc, but with a thin coating of copper to make it look like the original 95% copper pennies. Other US coins (except the seldom-used dollar)are a copper-nickel alloy, which is stronger and more "silver-like" in appearance than pure nickel or copper.
The dollar coin consists of four metals in a bronze sandwich structure, with maganese added to copper, zinc and nickel in the surface layers
The dollar coin consists of four metals in a bronze sandwich structure, with maganese added to copper, zinc and nickel in the surface layers
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