Optical microscope（OM）,scanning electron microscope（SEM）,energy dispersive spectrometer （EDS） and X-ray Diffraction（XRD） were used to study the effects of rare earth on the microstructural characteristics of 55%Al-Zn-1.6%Si hot -dip coatings on steel.The results of OM,SEM and EDS showed that by adding RE into the 55%Al-Zn-1.6%Si bath,the saw-toothed shape of intermetallic reaction layer of coating became smooth,and the thickness of the overlay and intermetallic reaction layer decreased.The XRD results revealed that the intermetallic reaction layer was comprised of two different regions,a bright phase closest to the steel substrate with phases of Fe2Al3 and a dark phase closest to the metallic coating with phases of FeAl3/α-Fe-Al-Si.
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