脉冲占空比和脉冲频率对Ni-Co-SiC复合涂层组织和性能的影响

Effect of Pulse Duty Cycle and Pulse Frequency on Microstructure and Properties of Ni-Co-SiC Composite Coatings

在碳钢X65上通过脉冲电流沉积的方法制备Ni-Co-SiC复合涂层,研究了脉冲占空比和脉冲频率对涂层性能的影响。结果表明,随着脉冲占空比的减少和脉冲频率的增加,Ni-Co-SiC复合涂层形态从结节变为针状结构,沉积在涂层中的SiC颗粒增加,晶粒尺寸变得更加细小。当显微硬度在5100N/mm^2和6700N/mm^2之间变化时,涂层的显微硬度随着脉冲占空比的增加而降低,随着频率的增加而增加。随着脉冲占空比的减小,电荷转移电阻值增加,复合涂层材料的耐腐蚀性增强;随着脉冲频率的增加,电荷转移电阻增加,复合涂层材料的耐腐蚀性增强。

Ni-Co-SiC coating was prepared by pulse current deposition on carbon steel X65. The effect of pulse duty cycle and pulse frequency on the properties of the coating was investigated. The results show that, with the increase of pulse duty cycle and the decrease of pulse frequency, the morphology of the coating became from nodules into acicular structure, the deposition of SiC particles in the coating increases, the grain size became smaller. When the hardness changes between 5 100 N/rnm2 and 6 700 N/mm2, the micro hardness of the coating decreases with the increases of pulse duty cycle and increases with the increases of frequency, With the decrease of pulse duty cycle, the charge transfer resistance value increases, the corrosion resistance of the composite coating increases. With the increase of pulse frequency, the charge transfer resistance increases, the corrosion resistance of the composite coating increases.