Rust occurs when iron reacts with oxygen from water or moisture to produce iron oxide. It's a combustion reaction, minus the flames you would get with fire.
If rust is left untreated, it can corrode through all the metal in your products and create holes, which will weaken the strength of these products.
Rust can be removed from metal using household products like lemon juice, baking soda, vinegar, and steel wool, or you can purchase chemicals to remove it.
To recycle rusted metal, you need to remove the oxygen again, as rust needs to be addressed to ensure the metal is reusable.
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