1. Zinc plating
  2. Alloy formation
  3. Vulcanization
  4. Galvanization
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Answer: Option 4

Galvanization or galvanizing (also spelled galvanisation or galvanising) is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which the parts are submerged in a bath of molten hot zinc.

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