Corrosion is a natural process
that converts a refined metal into a more chemically-stable form such as oxide,
hydroxide, or sulfide. It is the gradual destruction of materials (usually
metals) by chemical and/or electrochemical reaction with their environment.
Corrosion engineering is the field dedicated to controlling and stopping corrosion.
In the most common use of the
word, this means electrochemical oxidation of metal in reaction with an oxidant
such as oxygen or sulfates. Rusting, the formation of iron oxides, is a
well-known example of electrochemical corrosion. This type of damage typically
produces oxide(s) or salt(s) of the original metal and results in a distinctive
orange colouration. Corrosion can also occur in materials other than metals,
such as ceramics or polymers, although in this context, the term
"degradation" is more common. Corrosion degrades the useful
properties of materials and structures including strength, appearance and
permeability to liquids and gases.
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