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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.
Wiki User
∙ 14y ago
Wiki User
∙ 15y agoSalt water will cause corrosion faster because salt is acting as a catalyst - speeding up the change and eroding the material of the penny away.
Wiki User
∙ 15y agoCoins show more corrosion when they are in tap water.
Wiki User
∙ 14y agoAny ways the ANSWER is salt water
Wiki User
∙ 14y agoit takes about 5 years
Wiki User
∙ 11y agotap water
Wiki User
∙ 13y agosalt water
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Why do coins corrode more in tap water than in saltwater?
salt water
Why do metal corrode more quickly near the sea?
Salt water is corrosive. And there is more moisture in the air.
What metals are best resistant in salt water?
Metals that corrode in salt water easily include iron and tin.
What is the effect does water have on steel?
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.
What happens when you put coins in salt water?
Some coins contain metals toxic to salt water invertebrates, for example copper pennies. Putting the coin in the water can kill those animals.
Why do coins corrode more in tap water than in saltwater?
salt water
Do coins corroide more in salt water or in fresh water?
Salt water will
Why do metal corrode more quickly near the sea?
Salt water is corrosive. And there is more moisture in the air.
Iron and steel corrode more rapidly near the cost of an acean?
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.
Why do metals corrode quickly near the sea?
Salt water is corrosive. And there is more moisture in the air.
What happen when zinc and copper in salt water?
they will corrode
How long will it take for a penny to corrode salt water?
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Does saltwater corrode quicker than tap water?
Yes
What metals are best resistant in salt water?
Metals that corrode in salt water easily include iron and tin.
What metal corrodes the slowest in salt water?
The noble metals such as gold, silver, or platinum (etc.) do not readily corrode in salt water
Does a nickel corrode faster in salt water than in tap 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.
Why does water corrode metals?
BECAUSE THE GRAINS IN THE SALT MAKE THE COIN TURN BLACK
