What type of corrosion is most commonly found on aluminum?

Pitting is the correct answer because it is a localized form of corrosion that occurs on aluminum and results in the formation of small cavities or pits on the surface. This type of corrosion is particularly significant because it can lead to material failure even if the overall material appears sound. Aluminum naturally forms a protective oxide layer when exposed to air, but in certain environments, this layer can be compromised or uneven, allowing pits to develop.

In contrast, oxidation is a broader term that describes the chemical reaction where aluminum reacts with oxygen but does not necessarily lead to localized damage like pitting does. Crevice corrosion typically occurs in poorly drained areas where moisture can become trapped; while this can affect aluminum, pitting remains more prevalent. Uniform corrosion refers to an even distribution of corrosion across the metal surface, which is less characteristic of aluminum; it tends to resist such uniform degradation due to its oxide layer. Thus, pitting is recognized as the type of corrosion most commonly found on aluminum due to its specific electrochemical behavior and environmental interactions.