Question
Painting, oiling, galvanizing and tin plating are methods of preventing rusting.
a) Explain the similarity of these methods in the way they prevent rusting
b) Explain why galvanized iron objects are better protected from rusting even when scratched
Answer
a) They prevent iron from direct contact with water and oxygen.
b) Because zinc is more reactive than iron and therefore it is one that corrodes instead of the iron (sacrificial protection)
b) Because zinc is more reactive than iron and therefore it is one that corrodes instead of the iron (sacrificial protection)
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