Why is iron galvanised with zinc ? Can it be galvanised with copper ? If not, why ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Galvanization**: Galvanization is a process used to protect iron and steel from rusting (corrosion) by coating them with a layer of zinc. This is important because iron, when exposed to moisture and oxygen, can easily corrode and form rust.

2. **Why Zinc is Used**: Zinc is more reactive than iron. When iron is galvanized with zinc, the zinc acts as a sacrificial anode. This means that if the coating is scratched or damaged, the zinc will corrode first, protecting the underlying iron from rusting. The presence of zinc prevents the iron from coming into contact with moisture and air, which are necessary for rust formation.

3. **Can Iron be Galvanized with Copper?**: No, iron cannot be galvanized with copper. The reason for this is that copper is less reactive than iron. If copper were used as a coating, it would not corrode before the iron does. Therefore, it would not provide the necessary protection against rusting.

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