© examsiri.com
Question : 94 of 100
Marks:
+1,
-0
Solution:
The correct answer is Zinc.
- Galvanised iron pipes have a coating of Zinc.
- Galvanization is a method used for coating metal to protect it against corrosion.
- The most common method is hot-dip galvanizing, in which steel sections are submerged in a bath of molten zinc.
- How galvanizing protects from rusting:
- It forms a barrier that prevents corrosive substances to come in contact with oxygen and water.
- The zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc.
- The zinc surface reacts with the atmosphere to form a compact, adherent patina that is insoluble in rainwater.
© examsiri.com
Go to Question: