采用添加了纳米TiN的氨基磺酸镍系镀液，利用超声电沉积方法在45钢基体上制备了纳米TiN/Ni复合镀层，对比研究了直流、单脉冲、正负脉冲等3种电流作用方式对镀层表面形貌、纳米TiN含量及分布、界面结合力、显微硬度和摩擦磨损性能的影响。结果表明：与直流电沉积相比，脉冲电沉积镀层的晶粒细小、表面平整、表面裂纹少、界面结合力高，且正负脉冲电沉积的界面结合力高于单脉冲电沉积的；脉冲电沉积更易沉积纳米TiN粒子，且正负脉冲电沉积TiN的沉积速率大于单脉冲的；正负脉冲电沉积镀层的显微硬度最高，摩擦磨损性能最佳，直流电沉积的最差。

Nano TiN/Ni composite coatings were prepared on 45 steel substrate by the ultrasonic-electrodeposition method with a nickel sulfamate electroplating solution containing nano-TiN particles. The effects of the three current modes of direct current, single pulse and positive-negative pulse on surface morphology, nano-TiN content and distribution, interface binding force, microhardness and friction-wear performance of the coatings were compared and studied. The results show that compared to those by direct current electrodeposition, the grains of the pusle electrodeposited coating were finer, the surface was smoother, the surface cracks was fewer and the interface binding force was higher. The interface binding force of the positive-negative pulse electrodeposited coating was higher than that of single pulse electrodeposited coating. It was relatively easy for the pulse electrodeposition to deposite nano-TiN particles. The nano-TiN particle deposition rate by positive-negative pulse electrodeposition was higher than that by single pulse electrodeposition. The microhardness of the positive-negative pulse electrodeposited coating was the highest and its friction-wear performance was the best, while those of the direct current electrodeposition coating were the worst.