Corrosion and prevention

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4 Terms

1
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How do things corrode?

  • when metal gradually gets destroyed by reacting with substances in the environment

    • only happens at surface of material

2
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What happens when aluminium is exposed to air?

It will corrode but it causes aluminium oxide to form, which acts as a protective layer and so it does not flake away.

3
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What are some methods of preventing corrosion?

  • adding oxide layer

  • lubricate it with oil

  • painting

  • polishing

  • coat metal with plastic

  • electroplate

4
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Describe the sacrificial method.

It it when you place a more reactive substance with the one you want to protect, so that water and oxygen will react with the more reactive substance instead.