The different zinc layers are the main distinguishes between galvanized sheets and Al-Zn alloy coated steel sheets.
There is a zinc layer on the surfaces of galvanized sheets, which could protect the anodic. It means that zinc layers replace base metals from being corroding. Only when the zinc layers disappear did the base metals be corroded.
The surface cladding material of the aluminium zinc plat is made with 55% aluminium, 43.5% zinc and a little amount of other elements. Because the zinc aluminized coating could do little to protect the anode and plays a little role in resisting the corrosion. When the xinyulume is cut, people should coat the margin to prolong the service life.
The surface of the Al-Zn alloy coated steel sheet is more beautiful than that of zinc coated steel. Besides, it is more expensive than the zinc coated steel. And the minimized spangle is more expensive than the big spangle.
In the moist city, if there is a little corrosion of the Al-Zn alloy coated steel sheet without any remedial measures, it will be diffuse. But it will not occur in zinc coated steel.