GCSE Chemistry (AQA)

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Preventing Corrosion

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Preventing Corrosion

5:33 Corrosion and its prevention
Spec 4.10.3.1
Previous Corrosion & Rusting Next Uses of Alloys
  • Coatings protect metal objects from corrosion.
  • Cars are made from steel and coated with special paints for color and protection.
  • Coatings prevent water and oxygen from reaching the metal.
  • Steel contains iron, which is susceptible to rusting, requiring non-reactive coatings.
  • Metals can be painted to prevent corrosion.
  • Painted metal fences are protected from rusting outdoors.
  • Greasing metals, like bicycle chains, prevents corrosion by forming a protective layer.
  • Electroplating uses electrolysis to form a protective layer of another metal.
  • Electroplating is common for jewelry and cutlery.
  • The coating method depends on the use of the item (e.g., greasing a bicycle chain instead of painting).
  • Aluminum forms its own oxide coating that prevents further corrosion.
  • Coating with a more reactive metal (sacrificial protection) protects the base metal.
  • Zinc is often used for sacrificial protection, such as on boat hulls and galvanized nails.
  • Methods to protect metals from corrosion include greasing, painting, electroplating, and sacrificial protection.
  • Sacrificial protection involves using a more reactive metal to corrode instead of the base metal.

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