Aluminium oxidation is what makes aluminium resistant to corrosion. Aluminium has a high affinity for oxygen. When a new aluminium surface is exposed to air or any other oxidizing agent, it rapidly forms a thin, hard alumina film.
Oxide does not conduct electricity. However, certain oxides of perovskite structures have conductivity in the cathodes of solid oxide fuel cells and oxygen generation systems. They are compounds containing at least one oxygen anion and one metal cation. They are generally insoluble in aqueous solutions (water). They are very stable so that they can be used in ceramic structures, such as aluminium oxide ceramic bowls for the production of advanced electronic devices, and lightweight structural components used in aerospace and electrochemical applications, such as fuel cells.
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