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Corrosion

Corrosion. Formation of Oxides. Corrosion:. The chemical reaction which occurs between a metal and oxygen which results in the formation of a new substance called an oxide. There are both positive and negative forms of corrosion. Negative Corrosion:. commonly known as RUSTING

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Corrosion

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  1. Corrosion Formation of Oxides

  2. Corrosion: • The chemical reaction which occurs between a metal and oxygen which results in the formation of a new substance called an oxide. • There are both positive and negative forms of corrosion.

  3. Negative Corrosion: • commonly known as RUSTING • Iron and steel react with oxygen and forms rust. • Rust eats away at the metal and then reacts like a sponge, sucking up water and other pollutants until a hole is formed in the metal.

  4. Positive Corrosion: • Aluminum undergoes positive corrosion such as when your baking pans at home develop the gray coating on the metal. • The gray coating is actually aluminum oxide, or corrosion, which protects the metal.

  5. Preventing Corrosion • To prevent corrosion you need to coat the metal with something else, such as paint, oil or undercoating. What is an alloy? • By covering the metal with another material you are preventing the oxygen from getting at the metal and starting the corrosion process.

  6. Continued… • Using alloys can also prevent corrosion as some metals are more prone to corrosion than others. • We now use alternate materials for some things pure metals used to be used for. For example, bumpers on cars are now made of molded plastics.

  7. Questions • Page 35 do questions 5 and 6.

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