Give an example where corrosion is an advantage rather than a disadvantage.

Explanation

**Step-by-Step Solution:**

1. **Understanding Corrosion**: Corrosion is the process where metals react with environmental factors (like moisture and oxygen) leading to deterioration. It is typically seen as a disadvantage because it can weaken structures and materials.

2. **Identifying a Metal**: In this case, we will focus on aluminum as our example of a metal that experiences corrosion.

3. **Observation of Aluminum**: When aluminum is exposed to air, it tends to develop a dull appearance over time. This dullness is due to the formation of a layer on its surface.

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