why does galvanized iron not rust even when the zinc layer is broken?
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Zinc is more reactive than iron, and loses electrons more easily. The outer layer of zinc of any galvanized material, reacts with the atmospheric oxygen to form Zinc Oxide (ZnO), which is stronger than Zinc. Thus, even if the outer layer of zinc undergoes corrosion, the material is getting coated with a stronger substance (ZnO), and thus is better able to resist corrosion.
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zinc combine with oxygen to form ZnO ut is stronger than zinc. so ,when zinc breaks zinc oxide restit from corrosion
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