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Faster than what?

Iron rusts when it is in the presence of water and oxygen. If you add salt to the water, it will rust more quickly than it does in pure water, which is why piers in the sea are inevitably rusty. The salt helps to set up an electro-chemical reaction that speed up the process by stripping off the coating of iron oxide as it forms on the surface of the metal. Sulfur dioxide and carbon dioxide dissolved in the water will also accelerate rusting.

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