Corrosion is the deterioration of
the essential properties in materials due to reactions with its environment. The loss of an electron in metals is how metal
corrodes when it reacts with water or oxygen. Weakening of iron because of oxidation of the iron atoms is a widely known example
of electrochemcali corrosion. Also known as rust, this particular type of deterioration usually affects metallic materials
and usually produces oxides of the original metallic substance. Corrosion can also include the dissolution of ceramic materials
and can refer to discoloration, due to the weakening of polymers be the UV light of the sun.
structural alloys corrode simply from being exposed to airborne moisture, but the deterioration process can be significantly
affected by exposure to particular substances. Corrosion can be concentrated in a certain area to form a pit or crack, or
it can extend across a wide area to result in overall deterioration. Some attempts to reduce corrosion merely redirect the
damage into less visible, less controlled or predictable forms. Controlled corrosion treatments, including passivation and
chromate-conversion can increase a materials corrosion resistance.