Question

how can iron articles be rust resistant even after zn plating is broken ​

Answer 1

Answer:

If the zinc coating is broken, the galvanized object remains protected against rusting because zinc is more reactive than iron and hence can be easily oxidized. Thus when zinc layer breaks down, the zinc continues to react and get oxidized. Hence iron object is protected.

Explanation:

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Answer 2

Answer:

because zinc is more reactive than iron it can easily oxidized