As a metal corrodes, what happens to oxygen?

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asked Jul 8, 2018 112k views

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Meuk Light · Answer 1 · 2018-07-12T21:53:19+0000

Oxygen is reduced. For example, corrosion of iron occurs according to the scheme:

4Fe + 3O₂⁰ + 6H₂O = 4Fe(O⁻²H)₃

O₂ + 2H₂O + 4e⁻ = 4OH⁻
Fe - 3e⁻ = Fe⁺³

As a metal corrodes, what happens to oxygen?

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