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What is Rust?

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What is Rust? The most common example of is this the rusting of iron, a natural chemical reaction in which the iron combines with both oxygen and water to form hydrated iron oxide. The oxide is a solid that is soft, somewhat bulkier than the iron from which it is formed, relatively weak, and brittle. Alloying The alloying method is the most effective, but the most expensive. A good example is stainless steel, nickel and other metals are alloyed with the iron; this alloy is not only absolutely rustproof but will even resist the action of such corrosive chemicals as hot, concentrated nitric acid. ...read more.


Barrier Methods The third method, Barrier Protection, involves coating the surface with an impermeable layer. It is the least expensive and therefore the most common method of protection. It will work as long as no crack appears in the coating. Once the coating cracks, however, rusting proceeds at least as fast as it would with no protection. If the protective layer is a metal such as tin or chromium, an electric potential is set up, protecting the layer but acting on the iron and causing the rusting to proceed at an accelerated rate. ...read more.


Similar oxide layers, although less active than aluminium, protect lead and zinc. Copper, a comparatively inactive metal, is slowly corroded by air and water in the presence of such weak acids as carbonic acid, producing a green, porous, basic carbonate of copper. Green corrosion products, called verdigris or patina, appear on such copper alloys as brass and bronze, as well as on pure copper, as is often seen on public statues and ornamental roofs. These layers can and are all sacrificed to protect Iron and Steel from rusting. This method of protecting is called Sacrificial Protection, because a less abundant metal oxide is sacrificed. Nathaniel Roffe 11A ...read more.

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