Here's a breakdown:

* Oxidation: The metal atoms lose electrons and become positively charged ions. This process is called oxidation.

* Reduction: The electrons lost by the metal atoms are gained by another substance, usually oxygen or water. This process is called reduction.

Example: Rusting of Iron

Iron (Fe) reacts with oxygen (O2) and water (H2O) to form iron oxide (Fe2O3), commonly known as rust.

* Oxidation: Fe → Fe²⁺ + 2e⁻

* Reduction: O2 + 4e⁻ + 2H2O → 4OH⁻

The overall reaction is:

4Fe + 3O2 + 6H2O → 2Fe2O3·3H2O (rust)

Key takeaways:

* Corrosion involves the transfer of electrons.

* Oxidation is the loss of electrons.

* Reduction is the gain of electrons.

* Corrosion is a common and often destructive process that can affect a wide variety of materials.