Luminum forms a layer of aluminum oxide when exposed to air which protects the bulk metal from further corrosion.4al(s) + 3o2(g) → 2al2o3(s)

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Luminum forms a lamina of aluminum oxide when unguarded to air which protects the integrity metal from advance inactivity.4al(s) + 3o2(g) → 2al2o3(s)
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