# Why do we talk about hydrogen evolution for the corrosion of aluminum?

During the corrosion of aluminum, we have the oxidation of aluminum to its ionic form and this reaction is balanced by a reduction of ions in solution.

So basically it is the reduction of $\ce{H+}$ protons and oxygen ($\ce{O2}$). But we generally presume the overall reaction is the oxidation of aluminum and the reduction of hydrogen protons and we neglect the oxygen reduction.

Why do we only talk about hydrogen evolution for most metals?

Thank you for your answer but actually my question was why when writing the corrosion reaction of Aluminum or other metals , we generally just write the one representing the hydrogen evolution and the oxidation of Oxygen and we do not mention the other reaction which the reduction of oxygen. So basically the two reactions considered are the oxidation of Aluminum and the hydrogen evolution.

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