Corrosion is non-uniform if the time average of the
corrosion current through a unit area depends on its position on the surface. Non-
uniform corrosion can be due to inhomogeneities of structure or of composition of the corroding material,
or to inhomogeneities of the environment. Special cases of non-
uniform corrosion such as pitting or intergranular corrision are sometimes called localized
corrosion.
Source:
PAC, 1989, 61, 19
(Electrochemical corrosion nomenclature (Recommendations 1988))
on page 21