Most coins don't rust. In common terminology rust is a form of iron oxide and occurs only when a ferrous metal such as iron or steel is exposed to air and moisture. Many coins issued around the world are instead made of metals that aren't subject to rusting; e.g. nickel, copper, aluminium, etc. These metals can still oxidize but the damage is almost always far less than what would happen to unprotected steel.
Some countries, though, make coins from ferrous metals because they're less expensive than non-rusting alternatives. In these cases the steel is plated or bonded with some kind of non-ferrous metal (usually nickel or copper) to prevent direct air contact.
There were cases of steel-based coins rusting before modern plating techniques were developed. Among others:
Yes If u put them in water
With one exception, U.S. coins have not been made of ferrous (i.e. iron or steel-based) metals, so they cannot rust in the standard sense of the word. However older silver coins tarnished and modern copper-nickel or brass coins can oxidize. They can also corrode if exposed to water containing various corrosive chemicals.
The only major exception occurred in 1943 when the Mint struck cents out of zinc-coated steel because copper was needed to make ammunition. The zinc coating tended to wear off and the underlying steel then rusted.
no, but they do corrode
A penny will rust faster because it made entirely of zinc with a thin outer coating of copper, and zinc is made to rust unlike nickel which is used to make nickels, dimes, etc...
pennies don't rust!
US dimes can't rust, but some Canadian dimes can. Rust affects ferrous metals like iron and steel. US dimes are made of copper and nickel, but recent Canadian dimes have been made of plated steel. If the plating is damaged the underlying steel can rust.
Tarnish.
Pennies do not rust because they are made of copper
In recent years pennies have been made of steel plated in copper, and steel is prone to rust. Older pennies were made of pure copper, or copper and zinc, which did not rust.
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Pennies don't rust. Rust technically speaking is iron oxide and pennies have little to no iron. They do however oxidize, tuning them green from the copper which makes up most of the metal they are made from.
Pennies don't rust; they're copper. They corrode. The phosphoric acid, carbonation and salt in soda will corrode a penny faster than the other liquids.
Copper and zinc-plated pennies do not rust, because they're not made of iron. The only American pennies that could rust were the steel cents struck in 1943. You might believe that a penny is rusting but instead it is corroding! Yes, it does not rust it just corrodes.
the acid eats away the rust
NO!!! Because they are made of copper NOT iron.