what is rust? Explain why painted metal dosent go rusty
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Rust is a a reddish- or yellowish-brown flaking coating of iron oxide that is formed on iron or steel by oxidation, especially in the presence of moisture.
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Rust, commonly referred to as oxidation, occurs when iron or metal alloys that contain iron, such as steel, are exposed to oxygen and water for a long period of time. Rust forms when iron undergoes the process of oxidation but not all oxidation forms rust.
Coatings can slow the rate of diffusion of water and oxygen from the environment to the metal surface. This slows the corrosion process. The paint film can slow the rate of diffusion of corrosion products from the metal surface through the paint film. This also slows the corrosion process.
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