Which property of zinc makes it suitable for galvanising steel?
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A.
High density
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B.
Corrosion resistance
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C.
High melting point
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D.
High electrical conductivity
Correct Answer:
B. Corrosion resistance
Explanation:
Zinc is used for galvanizing steel primarily because of its excellent corrosion resistance. When applied as a coating, zinc acts as a protective barrier that prevents moisture and oxygen from reaching the underlying steel. Furthermore, zinc provides sacrificial protection; even if the coating is scratched, the zinc will corrode in place of the steel due to its higher reactivity, effectively extending the lifespan of the metal structure.
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