Exfoliation corrosion
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In metallurgy, exfoliation corrosion is a form of intergranular corrosion that manifests itself by lifting up the surface grains of a metal by the force of expanding corrosion products occurring at the grain boundaries just below the surface. It is visible evidence of intergranular corrosion. It is most often seen on extruded sections where grain thickness is less than in rolled forms.
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