pitting, localized form of corrosion by which cavities, or “holes,” are produced in the material; intergranular,
localized attack along the grain boundaries; exfoliation, often initiated at end grains, edges or holes and whose
corrosion products are formed and they force metal away from surface materials; filiform, occurs under some
coatings in the form of randomly distributed threadlike filaments; and staining, bright surfaces can be stained in
certain aqueous solutions