What causes corrosion?
by 
randomness - is now a Maestro
ANSWERS: 5
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Oxygen in many cases. I think it can be a large gambit of things.
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Corrosion is caused when a metal comes in contact with substances that oxidise it.Mostly oxygen and moisture.
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Usually what causes corrosion, at least what we can see in our daily life, is what is called "wet" corrosion. "Wet" corrosion means that there is a water phase, humidity, rain, seawater..., in contact with the metal surface. So what causes corrosion is the interaction of the water, or better the oxygen dissolved in the water, through a series of electrochemical reactions, with the metal. http://www.corrosionist.com/how_does_rust_form.htm
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corrosives.
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Metal plus oxygen = corrosion. Happens faster in water (due to the abundance of oxygen in water and the reactive nature of water).
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