The first thing everyone thinks about when they see rusty metal is red dust just sitting on top of the surface waiting to crumble off at any moment. So if your metal object contains any iron, regardless of whether it’s actually rusted or not, it can still be affected by this chemical reaction which will make it appear rusty even though there are no actual signs of rust. It’s basically a corrosive reaction between water, air and salt. Rusting is an electrochemical process that affects iron-based materials exposed to the elements. You can’t stop rust, but you can slow it down.
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