Iron corrodes faster than aluminum even though iron is placed below aluminum in the electro chemical series. Why?

kvishal9956

New member
Iron corrodes faster than aluminum despite being below aluminum in the Electrochemical series due to the formation of a protective oxide layer on aluminum (Al2O3) that slows down corrosion. In contrast, the oxide layer on iron (Fe2O3 or rust) is porous and allows water and oxygen to penetrate, leading to accelerated corrosion.
 
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