How does aluminum naturally resist corrosion?

Aluminum naturally resists corrosion due to its ability to form a thin, transparent oxide layer on its surface when exposed to oxygen in the air. This oxide layer, primarily composed of aluminum oxide, acts as a protective barrier, preventing further reaction with moisture and oxygen. The layer is self-renewing, as any damage or disruption to the oxide coating prompts immediate reformation. This inherent corrosion resistance is a result of aluminum’s passivation, a process that stabilizes the metal’s surface and contributes to its durability. However, in aggressive environments or when exposed to certain chemicals, additional protective measures such as anodizing may be employed.