What are some common signs of corrosion on aircraft structures?

Blistering, discoloration, pitting, and rust formation are indeed some of the most recognizable signs of corrosion on aircraft structures. Each of these manifestations indicates a degradation of the material, often due to exposure to moisture, chemicals, or inadequate protective measures.

Blistering refers to the formation of small bubbles on the surface of the metal, which occurs when moisture gets trapped under a protective coating, leading to delamination and corrosion of the underlying substrate. Discoloration is a visual indicator that changes the appearance of the metal, which can suggest that chemical reactions are occurring that may compromise the integrity of the material. Pitting is a localized form of corrosion that creates small holes or pits in the metal surface, which can significantly weaken structural components over time. Rust formation is indicative of corrosion in ferrous metals and occurs when iron reacts with oxygen and moisture, producing iron oxide.

These signs are critical for aviation structural mechanics to identify early, as they can impact aircraft safety and performance if not addressed promptly. Identifying and mitigating corrosion helps ensure the longevity and reliability of aircraft structures.