Weather resistant steel plate is different from general steel plate. At the beginning, weather resistant steel plate will rust on the surface like general steel plate. Due to its high degree of alloying, this process is even faster than general steel plate. However, because the internal lattice of weather resistant steel plate is more complicated, a dark black dense rust layer will grow under the loose rust on the surface.
It is this dense rust layer that makes the weather resistant steel plate rusty on the surface, but the inside 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 general 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 as soon as you touch it. This kind of rust not only can not protect the steel, but brings wolves into the room and sucks water and oxygen onto the surface of the steel.
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