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A reactive metal - say Aluminum, can be veiwed as corrosion resistant - but is actually not. What happens is that pure aluminum actually corrodes extremely quickly. A thin film of aluminum oxide forms on the surface - and it is that film that is extremely adherent but also very corrosion resistant.

Rust on the other hand does not stick (adherent) to iron/steel. It spalls off allowing the iron underneath to corrode further.

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Is most metals reactive.?

Most metals are reactive to some extent, but their reactivity varies. Some metals, such as gold and platinum, are less reactive and do not easily tarnish or corrode. Other metals, like sodium and potassium, are highly reactive and must be stored in oil to prevent them from reacting with moisture in the air.


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