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How does the zinc layer protect iron in galvanisation?

Answer and explanation

Correct answer: It isolates iron from air and moisture and corrodes preferentially itself

The zinc coating forms a barrier between iron and air and moisture, preventing the oxygen and water needed for rusting from reaching the iron. If the coating is scratched, zinc, being more reactive than iron, corrodes first and provides sacrificial protection. Option B is incorrect because zinc does not convert iron into zinc. Exam tip: Remember that galvanisation gives both barrier and sacrificial protection.

Related tags

Class 10 ScienceChemical ReactionsGalvanisationZinc CoatingRustingCorrosion Prevention

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