In a normal atmosphere, a coin has a very thin layer of a metal oxide covering it, which prevents any sort of degradation by external forces, as this layer is very chemically inert. This layer is formed by the process known as passivation.
What happens in salt water, is that when the metal ions come off of the coin, they are isolated from each other by the salt ions surrounding them, which inhibits their interaction. This results in the protective oxide layer not being able to form, and the coin is therefore more susceptible to corrosion.
Salt water will cause corrosion faster because salt is acting as a catalyst - speeding up the change and eroding the material of the penny away.
Coins show more corrosion when they are in tap water.
Any ways the ANSWER is salt water
it takes about 5 years
tap water
salt water
salt water
Salt water is corrosive. And there is more moisture in the air.
Metals that corrode in salt water easily include iron and tin.
Think this through. What is the difference between sea water and freshwater? Salt. What does salt do? Rust or create buildups on metal. What types of metal? Several types including iron and steel.
Some coins contain metals toxic to salt water invertebrates, for example copper pennies. Putting the coin in the water can kill those animals.
salt water
Salt water will
Salt water is corrosive. And there is more moisture in the air.
Salt is abrasive and we find salt in abundance in ocean so the salty water is carried towards the ,etals and thus they corrode more easily.
Salt water is corrosive. And there is more moisture in the air.
they will corrode
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Yes
Metals that corrode in salt water easily include iron and tin.
The noble metals such as gold, silver, or platinum (etc.) do not readily corrode in salt water
All metals will corrode faster in salt water than in tap water. Corrosion involves the movement of ions and electrons. Having extra ions in the water (salty water has sodium and chlorine ions) speeds this up.
BECAUSE THE GRAINS IN THE SALT MAKE THE COIN TURN BLACK