What advantage does using aluminum over steel provide in aircraft construction?

Using aluminum in aircraft construction offers significant advantages, particularly concerning corrosion resistance. Aluminum naturally forms a protective oxide layer when exposed to air, which can prevent further oxidation and deterioration. This characteristic makes it highly suitable for use in environments where moisture and other corrosive agents are prevalent, such as in aviation.

The lightweight nature of aluminum also contributes to its appeal in aircraft design, allowing for improved fuel efficiency and payload capacity. Additionally, while aluminum does possess good fatigue resistance, it is the corrosion resistance that is most distinguishing compared to steel, which typically requires coatings or treatments to maintain its integrity in similar environments. As a result, aircraft manufacturers often choose aluminum to enhance both the longevity and reliability of their structures in demanding operational conditions.