Rust is the product we get when iron goes through the corrosion process. Iron and steel are not found free in nature. Both are extracted from iron ore in a blast furnace or electro oven. Large amounts of energy are introduced into the iron ore in the extraction process, when this stored up energy is released, the iron has a tendency to corrode back to its natural form "iron oxide" or RUST. Metals that are found free in nature are stable and are classified as being more noble but even metals found in nature have varying electrical potential Gold has a potential of 1.498 v whereas Antimony has a potential of only 0.152v once we add man made metals and Alloys to this a very basic scale of a metals nobility would look some thing like this.
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