对化学抛光处理后的Zn-Cu支架表面微管形貌和粗糙度进一步观察和测量，结果见图4-14。经过化学抛光后，Zn-Cu支架的表面粗糙度Ra为160 nm，已经达到与商用316L不锈钢支架（77 nm-188 nm）相当的水平。Zn-Cu合金中的第二相颗粒并未对支架的抛光产生影响。

The morphology and roughness of microtubes on the surface of the Zn-Cu stent after chemical polishing were further observed and measured, and the results are shown in Figure 4-14. After chemical polishing, the surface roughness Ra of the Zn-Cu stent is 160 nm, which has reached a level equivalent to that of the commercial 316L stainless steel stent (77 nm-188 nm). The second phase particles in the Zn-Cu alloy did not affect the polishing of the stent.