Iron in fresh water will actually rust
faster than in salt water. After a short
time, I would expect the iron in the fresh water
has a thin film after initial rust forms and
protects it from any further rusting. In the
salt water, an electrochemical corrosion reaction
is taking place, (the salt water lets electrons
flow much easier) and does not create the same
type of film as in the fresh water case. This
reaction takes longer than in the fresh water.
It may take longer than 2 weeks for the salt water
to rush more than the fresh water due to the
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