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Yes, zinc is more reactive than iron.

However, when zinc reacts with air, although it does so almost immediately, the zinc oxide that forms in the reaction covers the surface of the zinc, which protects it from reacting further with more air. The oxide covers the zinc like a skin or a coat of paint.

Iron is less reactive than zinc, but it still reacts with air. But the iron oxide (the rust) that forms flakes off easily and does not protect the iron much.

Where the rusting of iron is a problem, people sometimes will dip the iron in molten zinc. The zinc then forms a skin on the iron, protecting it from the air. It is like when you dip an ice cream into molten chocolate that then forms a skin that covers the ice cream.

Once the skin of zinc has formed on the iron the zinc quickly reacts with the air, forming a zinc oxide layer that protects the zinc metal while it protects the iron.

Protecting iron in this way with zinc is called galvanising.

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12y ago

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