Question

Aluminium is more reactive than iron yet there is less corrosion of aluminium as compared to iron when both are exposed to air. Give reason why!

Answer 1

Aluminium is indeed more reactive than iron yet there is less corrosion of aluminium as compared to iron , when both are exposed to air. This is because , when aluminium gets exposed to air , to form Al2O3 , it forms a protective layer, which protects the aluminium article from further corrosion . But, this does not happen with iron. When iron gets exposed to air , to form rust, it doesn't form any protective layer. So, the iron article further gets corroded .

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Answer 2

Metals get corrodes due to reaction with oxygen in presence of moisture

I case of iron

It corrodes continuously because the oxide layer of iron is permeable to air and water . It's give condition for crossion on surface of iron

And

I case of aluminium

When aluminium get moisture and oxygen it formed a oxide layer that. Is very tough and do not allow for air and moisture to come contract with its internal surface . Hence . It prevent aluminium to further corrosion