Why are clad aluminum alloys used in aircraft construction?

Clad aluminum alloys are primarily utilized in aircraft construction because they possess enhanced resistance to corrosion compared to uncoated aluminum alloys. The cladding process involves coating a core of aluminum alloy with a thin layer of pure aluminum, which acts as a protective barrier against environmental factors that can cause corrosion, such as moisture and salt. This makes clad aluminum alloys particularly valuable in aviation, where lightweight materials must also withstand harsh atmospheric conditions over time.

The other options do not accurately reflect the primary benefits of clad aluminum alloys. While they might have advantages related to cost or weight, the main appeal in the context of aircraft construction is their superior corrosion resistance, which directly impacts the longevity and safety of airframe structures.