There are many types of corrosion. I will talk
about the main one and take the metal as an
example. Generally the corrosion of metal means
the formation of the more chemically stable state
of the metal, such as oxide, hydroxide,
etc...As metal generally have free electrons.
When in contact with acid, there will be some
chemical reactions. Electrons will be donated
to the ions in the acid, leaving the metal in
the ionic state, which is essential for the metal
to form the final stable state such as those
mentioned above. That's why a lot of acids are
corrosive when compared to the natural corrosion
in air or water. Generally speaking, the acid
will speed up the process, the rate of corrosion,
as a result of the chemical reaction.
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