How does rust form?
(simplified)
Corrosion (rust) is an
electrochemical process. This means that chemical reactions take place
through the exchange of electrons and
cause rust.
Under normal conditions, the steel of your car or
truck contains a mass of Iron Atoms, Impurity Atoms and Free
Electrons. By nature, the Iron Atoms have a positive charge (+) of
about +1 volt compared to the Impurity Atoms. Thus, the Impurity Atoms
have a negative charge (-) compared to the Iron Atoms.

Because the Iron Atoms have a higher voltage, there
is an attraction of the free electrons from the Impurity Atoms
(positive attracts negative).

As soon as there is water (moisture) on your car or
truck, the water becomes the path for the free electrons to travel
from the Impurity Atoms (-) and attack the Iron Atoms (+) in the
steel; this reaction is called oxidization (rust).

Along coastal and surrounding areas, there is a
high salt content in the air due to the sea. When the salt mixes with
water (moisture), the water becomes more conductive. This allows the
free electrons to travel through the water more easily, intensifying
the rusting process. The same situation occurs in areas where salt is
used to melt icy roads.
To simplify the equation, there needs to be
water and free electrons present for rust formation
to occur.
By eliminating any one of these agents rust will
not be able to form.
See Also
Rust Prevention
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