The microcharacteristics of the oxide film on the surface of ZA27 melt were investigated using X-ray Photoelectron Spectroscope （XPS）

Scanning Electron Microscope （SEM） and X-ray Diffraction （XRD） etc. Contrary to expectations

the oxide film consists mainly of ZnO

Al

3

+ and Zn

O

while a small amount of Mg

2

+ and Cu

O

also exist in the film. The ions of Mg

2

+ are obviously concentrated on the surface of the film. In these oxides

the phenomenon of metallic ions excess is quite evident. In addition

it has been proven that

partially due to the oxidizing

the contents of Zn in the melt will decrease and that of Al will increase.