Corrosion

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Rusting of iron in moist air is electrochemical because:

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1. **Surface Cell**: Tiny electrochemical cells form on the surface of iron where moisture and $CO_2/O_2$ are present.
2. **Anodic region**: $Fe(s) 	o Fe^{2+}(aq) + 2e^-$.
3. **Cathodic region**: Electrons travel to another spot where Oxygen is reduced: $O_2 + 4H^+ + 4e^- 	o 2H_2O$.
4. **Circuit**: The metal acts as a wire, and the water droplet acts as an electrolyte salt bridge.
5. **Completion**: Subsequent oxidation of $Fe^{2+}$ by oxygen leads to hydrated Iron(III) oxide (Rust).

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