Abstract
Zinc-aluminum alloys are useful for super plasticity character, but surface finishing of these alloys are difficult for eutectoid structure. If surface composition could be changed to resemble pure aluminum or zinc structure, surface finishing becomes easy. Various composition (Zn/Al ratio is 70/30, 78/22, 85/15, 87/13) of zinc-aluminum alloys were treated with ion etching or arc discharge and change of surface structure was examined. By ion etching zinc component was removed from zincaluminum surface more easily than aluminum. Conversely aluminum was removed more easily by arc discharge on 70/30, 85/15 and 87/13 alloys, but the surface composition did not changed on eutectoid structure only. A similar behavior was observed on sprayed alloy films. These results infered as the momentary high overheating and melting of alloy surface.
