The dark green passivation film on galvanized steel sheet was analyzed by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). SEM images showed that the film is even and homogeneous. The bond is firm between passivation film/zinc coating and zinc coating/steel without microstructure defects like cracks. The total thickness of zinc coating and passivation film reaches 12.423 μm, and dark green passivation film is 1.734 μm. XPS results showed that the passivation film consists of Cr...