图是镀层微观结构图和对应的衍射图谱，图（a）中上方的黑色颗粒为Al2O3纳米颗粒，浅色部位为Ni的组织，Ni晶粒内部或者晶界处尺寸较小的暗区为NiCoO2组织。图（b）为α.Al2O3[301]晶带轴与Ni和NiCoO2多晶衍射环复合衍射图。

The figure shows the microstructure of the plated layer and the corresponding diffraction pattern. The black particles at the top of the figure (a) are Al2O3 nanoparticles, the light-colored part is the organization of Ni, and the dark area with smaller size inside the Ni grains or at the grain boundaries is the NiCoO2 organization. Figure (b) shows the composite diffraction pattern of α.Al2O3 [301] crystal band axis with Ni and NiCoO2 polycrystalline diffraction rings.