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.
- Syllabus
- 2026–2028
- Course
- Chemistry 0620
Exam points
- 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
9.5.2—Some common barrier methods question 1
[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.
painting / greasing / coating with plastic
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