Corrosion of a single phase having more than one component, when the ratio of the
corrosion rates of the components differs from the ratio of bulk
mole fractions. Selective
corrosion changes the composition of the material in the
interfacial region.
Source:
PAC, 1989, 61, 19
(Electrochemical corrosion nomenclature (Recommendations 1988))
on page 21