The various types of corrosion are listed in the following table:
Uniform corrosion
The reaction starts at the surface and proceeds uniformly. |
Localized corrosion (pitting corrosion)
The basis metal is eaten away and perforated in places in the manner of holes, the rest of the surface being affected only slightly or not at all. |
Wide pitting corrosion
The corrosion causes localized scarring. |
Intergranular corrosion
Imperceptible or barely perceptible from outside, since the corrosion proceeds at the grain boundaries. |
Transgranular or intragranular corrosion
The grain boundary material is retained, since the corrosion proceeds preferentially within the grain. |
Galvanic corrosion
Increased corrosion in crevices or cracks or at contact surfaces between two metal articles. |
Selective corrosion
Corrosive attack on structural constituents |
Exfoliation corrosion
Occurs in deformed articles. Corrosion follows "fiber orientation". |
Interfacial corrosion
Frequently observed at water-air interfaces. |
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