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Corrosion is a natural process of destruction like
earthquakes, tornados, floods, volcanic eruptions, etc. with one major
difference.
Whereas we can be only a silent spectator to the above processes of
destruction, corrosion can be prevented or at least controlled.
Several definitions of corrosion have been given, some of them are
reproduced below:
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Corrosion is the surface wastage that
occurs when metals are exposed to reactive environments
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Corrosion is the result of interaction
between a metal and environments which results in its gradual
destruction
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Corrosion is an aspect of the decay of
materials by chemical or biological agents
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Corrosion is extractive metallurgy in
reverse. For instance, iron is made from hematite by heating.
Iron corrodes and reverts to rust after completing its life cycle.
The hematite and rust have the same composition
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Corrosion is the deterioration of materials
as a result of reaction with its environment (M.G. Fontana)
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Corrosion is destructive attack of a metal
by chemical or electrochemical reaction with the environment (H.H.
Uhlig)
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