Weather resistant steel plate is different from ordinary steel. At the beginning, weather resistant steel plate will rust on the surface like ordinary steel. Due to its higher degree of alloying, this process is even faster than ordinary steel. However, because the internal lattice of weather resistant steel plate is more complex, a dark black dense rust layer will grow under the loose rust on the surface. This rust layer is composed of nano-particle α-FeOOH. In this dense rust layer, nickel atoms replace part of the iron atoms, which makes the rust layer have cation selectivity and inhibits the penetration of corrosive anions.
It is this dense rust layer that makes the weather resistant steel plate rusted on the surface, but the interior will not continue to be rusted. In fact, as long as you distinguish carefully, you can see that the surface of weather resistant steel plate is different from ordinary rust: the rust of weather resistant steel plate is uniform and dense, and it is close to the surface of the steel to protect the steel; while the rust is mottled, loose and porous. It will drop scum when touched. This kind of rust not only cannot protect the steel, but "brings wolves into the room", sucking water and oxygen onto the surface of the steel.
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