图是镀层中纳米颗粒含量为1.9wt.%镀层的截面形貌照片，由图可知，n-Al2O3/Ni-Co合金镀层截面组织致密，没有明显的树枝状组织。基体和镀层之间没有明显间隙，镀层结合力高。结合镀层的表面形貌，分析认为，n-Al2O3/Ni-Co合金纳米复合电沉积的电沉积过程均一，镀层的表面形貌没有出现包状的结晶组织，因此截面的形貌也不会出现树枝状或柱状结晶组织。

The figure shows the cross-sectional morphology of the plated layer with nanoparticle content of 1.9 wt.%. From the figure, it can be seen that the n-Al2O3/Ni-Co alloy plated layer has dense cross-sectional organization and no obvious dendritic organization. There is no obvious gap between the substrate and the plating layer, and the plating layer has high bonding strength. Combined with the surface morphology of the plated layer, it is analyzed that the electrodeposition process of n-Al2O3/Ni-Co alloy nanocomposite electrodeposition is homogeneous, and the surface morphology of the plated layer does not show packet-like crystalline organization, so the morphology of the cross section does not show dendritic or columnar crystalline organization either.