Why are clad aluminum alloys used in aircraft construction?

Clad aluminum alloys are utilized in aircraft construction primarily to inhibit corrosion. The outer layer of cladding, typically composed of pure aluminum, provides a protective barrier against oxidizing agents and atmospheric conditions that could lead to corrosion of the underlying alloy. This is especially important in aircraft, where exposure to moisture, salt, and other environmental factors can significantly accelerate corrosion processes.

The use of cladding ensures that the more susceptible aluminum alloys are safeguarded while still benefiting from the strength and durability of the alloy used for structural components. As a result, clad aluminum alloys help maintain the integrity and longevity of the aircraft, which is vital for safety and performance. The selection of materials in aircraft construction is crucial, and using clad aluminum alloys helps manufacturers meet the stringent requirements for durability and resistance to destructive environmental factors, thereby extending the lifespan of the aircraft structures.