Question 3(f)(ii)
[Maximum number: 1]
Iron is manufactured in a blast furnace.
Steel can be coated with zinc to prevent rusting. This provides both a barrier method and sacrificial protection.
Describe another barrier method for preventing rusting.
CAIE IGCSE Chemistry 9.5.2 Some common barrier methods
Practise naming common barrier methods that protect iron and steel surfaces from rusting in familiar contexts.
How this is tested
- choose paint, oil, grease or plastic coating as barrier methods for rust prevention
- explain that barrier coatings stop water and oxygen reaching iron or steel