图是n-Al2O3/Ni-Co镀层环形剪切法测试力。位移曲线，从图（a）可以看出，随着压力的增强，镀层在环形磨具的阻挡下，开始未剥离，当力增大到18.5448kN时，力.位移曲线出现拐点，镀层开始剥离，可以认为此时是镀层最大抗剪切强度。实验后的试样宏观照片如图（b）所示，从图中明显看到镀层为细小的鳞片状脱落，和硬铬镀层的大块状脱落形成了鲜明的对比。

The figure shows the force of n-Al2O3/Ni-Co plating ring shear method test. Displacement curve, it can be seen from Fig. (a) that with the enhancement of pressure, the plating starts to be unpeeled under the blockage of the ring abrasive, and when the force increases to 18.5448kN, the force. The inflection point of the displacement curve appears, and the plating starts to peel off, which can be considered as the maximum shear strength of the plating at this time. The macroscopic photograph of the specimen after the experiment is shown in Fig. (b), from which it is obvious that the plating is peeled off in small scales, which is in contrast to the large pieces of hard chrome plating.