What is the extreme form of intergranular corrosion along the grain boundaries called?

What is the extreme form of intergranular corrosion along the grain boundaries called?

• A. Exfoliation Corrosion
• B. Intergranular Corrosion
• C. Pitting Corrosion
• D. Crevice Corrosion

Answer: (A)

Exfoliation corrosion is the extreme form of corrosion that travels along grain boundaries and causes layers or sheets of metal to peel off from the surface. It’s a severe, laminar attack that progresses parallel to the surface, leveraging the weakened bonds at grain boundaries. Think of intergranular corrosion as the broader process of attack along grain boundaries; exfoliation is a particularly severe, peeling-type manifestation of that attack. In contrast, pitting corrosion creates isolated pits, crevice corrosion occurs in confined gaps, and intergranular corrosion in general doesn’t necessarily involve the peeling of layers.

Exfoliation corrosion is the extreme form of corrosion that travels along grain boundaries and causes layers or sheets of metal to peel off from the surface. It’s a severe, laminar attack that progresses parallel to the surface, leveraging the weakened bonds at grain boundaries.

Think of intergranular corrosion as the broader process of attack along grain boundaries; exfoliation is a particularly severe, peeling-type manifestation of that attack. In contrast, pitting corrosion creates isolated pits, crevice corrosion occurs in confined gaps, and intergranular corrosion in general doesn’t necessarily involve the peeling of layers.