Why do metals rust?

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Why do metals rust? by Mind Map: Why do metals rust?

1. Is the effect reversible?

2. Can rusting be prevented?

2.1. What can prevent rusting?

2.1.1. How does paint stop rust??

2.1.2. How does oil layer slow rust??

2.1.3. What chemicals stop rust??

3. Can rusting be slowed down?

4. Can we speed up rusting?

5. Is rust useful?

6. How can rust be harmful?

7. Is rust poisonous?

8. Why does rusting happen?