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At the initial stage of research and development, weathering steel was used as an industrial material in the fields of construction, shipping, railway and so on. The United States is the country that carried out the research on weather resistant steel as early as possible. Cowton steel, which originated in North America, is widely used in the manufacture of train cars, containers and bridges.As a new generation of advanced steel materials, weathering steel has outstanding visual expression, and the longer it is used, the more prominent its corrosion resistance.
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Weathering steel, unlike regular steel, will rust on the surface at first, just like regular steel. The process is even faster than for regular steel due to its higher degree of alloying. But because the lattice inside weathering steel is more complex, a dense layer of dark rust can grow beneath the loose rust on the surface. In this dense rust layer, nickel atoms take the place of some iron atoms, making the rust layer cationic selective and resistant to corrosive anions.It is this dense layer of rust that makes the surface of weathering resistant steel rust, but the interior will not continue to rust. In fact, as long as you carefully distinguish, you can see that the surface of weathering steel and ordinary rust is not the same: weathering steel rust is uniform and dense, close to the surface of the steel to protect the steel; And the rust is mottled, porous, a touch will drop slag.
