电沉积梯度Ni-Co纳米合金镀层的研究

采用直流电沉积技术制备了梯度Ni-Co纳米合金厚镀层。测定了该镀层的内应力及显微硬度，采用X射线衍射仪及能谱仪分别对镀层的晶相结构与成分进行了分析，采用扫描电镜对镀层的表面形貌和磨痕进行了观察，并对其摩擦、磨损性能进行了研究。结果表明，该合金镀层具有较好的成分梯度和相应的结构梯度，具有优异的抗磨减摩性能。说明梯度化的设计可以有效降低合金镀层的内应力，提高镀层的抗磨和减摩性能。

Study on electrodeposition of graded Ni-Co nanocrystalline alloys

Graded Ni-Co nanocrystalline alloys were obtained by direct current electrodeposition. The inner stress and micro-hardness of the graded alloys were tested. The crystal phase structure and composition of the alloys were analyzed respectively with XRD and EDS. The surface morphology and wear marks of the alloys were observed with SEM. Moreover, the friction and wear properties of the alloys were also studied. The results show that the graded Ni-Co nanocrystalline alloys have good composition gradient and corresponding structure gradient which results in excellent (properties) of friction and wear resistance. The gradient design not only can decrease the inner stress of the alloys effectively, but also can improve the wear resistance and friction-reducing performance of the alloys.