is an electrochemical process which occurs when dissimilar
metals are in contact with each other in the presence of an
electrolyte, most commonly being moisture and oxygen. For
example rain water and salt water make especially good
electrolytes. An electrolyte could be any non-metal matter that
will conduct an electric current and are predominantly liquids
or moisture. Every metal has been rated for nobility and then
placed on galvanic scales according to nobility. Basically
nobility is a measurement of the resistance to corrosion,
especially of one metal contacting another metal. Metals that
are the least noble means they are very anodic, electropositive
or high potential and will corrode most easily. Whereas metals
that are the most noble, means they are highly cathodic,
electronegative or low potential and will be the most resistant
to corrosion. The most corrosive effects will occur between
metals from the opposite ends of the galvanic scale or ranking
of nobility. This difference in electrical potential