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Are there different kindsof rust?
Yes, there are different kinds of rust. Rust is the common name for
iron oxide, and there are at least two oxides of iron I know of that
are chemically different. There's FeO and there's Fe2O3. The second
one, Fe2O3 has two different crystal structures: trigonal (hematite)
and cubic (magnetite). Add some water to the Fe2O3 molecules, and the
result is rust. Depending on how many water molecules are attached to
each Fe2O3 molecule, you can get different kinds of rust.
Other metals also oxidize, although instead of using the word
"rust", we usually call it "corrosion" or just plain "oxidation".
(republished on 07/13/06)
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