多场耦合参数对电沉积Ni-TiN纳米镀层性能的影响

Effect of multi-fields coupled parameters on the properties of electrodeposited Ni-TiN nanocoatings

利用多场耦合电沉积技术制备Ni-TiN纳米镀层,获得良好的高硬度、耐磨性好的复合镀层材料。研究多场耦合沉积的主要参数阴极电流密度、超声波功率和磁场强度对显微硬度、耐磨性的影响。结果表明,随镀液中磁场强度、阴极电流密度和超声波功率的增加,Ni-TiN纳米镀层中的显微硬度呈先增加后减小的变化趋势,而镀层的磨损量与之相反。多场耦合电沉积的最优工艺参数组合为阴极电流密度1.5 A/dm^2、超声波功率200 W、磁场强度0.6 T。在最佳工艺参数下制备的Ni-TiN纳米镀层表面粗糙程度较小,晶粒较细致,组织均匀度较好。

The Ni-TiN nanocoating was prepared by multi-fields coupled electrodeposition technology, and good composite coating materials with high hardness and good wear resistance were obtained. The effects of three main parameters in the multi-field coupling deposition(such as cathode current density, ultrasonic power and magnetic field strength) on the composition, hardness and wear resistance were studied. The results show that the microhardness of Ni-TiN nanocoatings increased at first and then decreased with the increase of magnetic field intensity, cathodic current density and ultrasonic power. And the wear amount of the coatings was opposite. The optimal combination of process parameters for multi-fields coupled electrodeposition was listed as follow: cathode current density of 1.5 A/dm^2, ultrasonic power of 200 W, and magnetic field strength of 0.6 T. The surface roughness, grain size and microstructure uniformity of the Ni-TiN nanocoating prepared under the optimal process parameters were excellent.