Although aluminum is a moderately reactive metal, it can be regarded as unreactive in everyday use because a layer of aluminum oxide coats the surface and prevents further oxidation. This is an example of

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Anodic inhibition occurs when a protective layer forms on the surface of a metal, preventing further oxidation or corrosion. In the case of aluminum, the aluminum oxide layer acts as a barrier, protecting the underlying metal from reacting with the environment. This is why aluminum, despite being moderately reactive, appears unreactive in everyday use.

Although Aluminum Is a Moderately Reactive Metal, It Can Be