Aviation Structural Mechanic Second Class (AM2) Advancement Practice Exam

Exfoliation corrosion in a rolled or extruded aluminum member is best described as what?

Intergranular attack that lifts or flakes surface layers apart A uniform oxide film that protects the alloy A crack produced only by overload A surface stain caused by hydraulic fluid

Correct Answer:

Intergranular attack that lifts or flakes surface layers apart

Explanation:

Exfoliation is an advanced form of intergranular corrosion. Corrosion products expand along elongated grain boundaries and force surface layers upward, producing a lifted or leaf-like appearance.

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