Why is it that the steel structure of the bridge is black after spraying aluminum? What hazards do you have after blackening?
You say black, should be closed paint, spraying time later, aluminum was oxidized results. The damage is obvious and accelerates the corrosion rate of the structure.
Spraying aluminum is a physical process in which the aluminum wire with high purity (99.6%) is filled with the surface of the steel by arc atomization
After the spraying of aluminium is finished, sealing paint shall be used immediately to protect against oxidation.
