Aluminum has a more negative electrode potential than iron, therefore it should corrode more readily than iron. Why doesn't it?Al(3+) + 3e(-) --gt; Alelectrode potential = -1.66 VFe(2+) + 2e(-) --gt; Feelectrode potential = -0.41 V
Aluminum IS NOT resistant to corrosion. What do you think that powdery white stuff that forms on it is? It may not rust, but it sure does corrode.
This Site Might Help You. RE: Why is aluminum more resistant than iron against salt water corrosion? Aluminum has a more negative electrode potential than iron, therefore it should corrode more readily than iron. Why doesn't it? Al(3+) + 3e(-) --gt; Al electrode potential = -1.66 V Fe(2+) + 2e(-) --gt; Fe electrode potential = -0.41 V
Aluminium oxyde is a very tough material that sticks to the aluminium metal underneath, protecting it. Iron oxyde, in the other hand, flakes off, exposing more iron underneath for it to be attacked.
Aluminium does corrode, forming aluminium oxide. Unlike iron oxide, however, aluminium oxide sticks very firmly to the surface of the metal, preventing further attack while being resistant to corrosion itself.
