What Causes Rust?

Answer

Rust is a type of corrosion; it is the slow breaking down of metals due to contact with air or water.
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Light and water and Oxygen. Metals which easily form oxides, especially when wet, will rust.
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Place some salt over the rust stain on the grout and soak it with lime juice. Allow this mixture to sit for about three hours to dissolve the rust. Rub the remaining rust stain with
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1 Additional Answer
Rust is caused by the mixing of the metal with oxygen from the water in the air. Over time, this causes rust on the outer layer of metal.
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