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摘要：本论文采用脉冲电镀法制备Ni-Mo-Er和Ni-Mo-Ce镀层。考察不同Er3+浓度、Ce3+浓度、电流密度、频率、占空比、电镀时间以及转速对镀层硬度的影响。利用X射线衍射、电子扫描显微镜，以及摩擦磨损量分析仪对镀层进行表征。研究结果表明，制备Ni-Mo-Er镀层的较佳工艺条件为pH为6.7、温度为25℃，Er3+离子浓度为0.3g/L、电流密度为19.25A/dm2、反应时间为20min、转速为350r/min、占空比为0.6、脉冲频率为5000Hz，获得的Ni-Mo-Er镀层硬度为759.36HV；制备Ni-Mo-Ce镀层的较佳工艺条件为Ce3+离子浓度为0.3g/L、电流密度为18.50A/dm2、反应时间为20min、转速为300r/min、占空比为0.5、脉冲频率为2000Hz，获得的Ni-Mo-Ce镀层硬度为731.58HV。Ni-Mo-Er比Ni-Mo-Ce镀层硬度增加3.80%。Ni-Mo-Er和Ni-Mo-Ce镀层比Ni-Mo结节更少，表面更平整。镀层中钼元素含量分别高7.27%和0.96%，耐磨性分别提高7.97%和16.81%。同时，Ni-Mo-Er和Ni-Mo-Ce合金镀层改善了Ni-Mo合金镀层的摩擦系数，使其分别降低11.84%和6.89%。目前，脉冲电镀Ni-Mo-Er和Ni-Mo-Ce镀层的研究还未见报道。关键词：脉冲电镀；Er；Ce；镍钼合金 9132
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Preparation of Ni-Mo-Er(Ce) coating
Abstract：This article was prepared by pulse plating Ni-Mo-Er and Ni-Mo-Ce coating. Effects of different concentrations of Er3+, Ce3+ concentration, current density, frequency, duty cycle, plating time and speed to the coating hardness were study. In addition, the use of X-ray diffraction, scanning electron microscopy, as well as the amount of friction and wear of the coatings were characterized by the analyzer. The results show that the preparation of Ni-Mo-Er coating process conditions preferably on a pH of 6.7, a temperature of 25℃, Er3+ ion concentration of 0.3g/L, the current density of 19.25A/dm2, the reaction time of 20min, speed of 350r/min, the duty cycle of 0.6, the pulse frequency of 5000Hz, obtained Ni-Mo-Er coating hardness that was 759.36HV; Preparation of Ni-Mo-Ce preferred coating process conditions Ce3+ ion concentration of 0.3g/L, current density of 18.50A/dm2, the reaction time of 20min, speed of 300r/min, duty cycle of 0.5, the pulse frequency of 2000Hz, obtained Ni-Mo-Ce coating hardness that was 731.58HV.The hardness of Ni-Mo-Er coating was 3.80 percent harder than the Ni-Mo-Ce coating.The nodules on the the plating layer of the Ni-Mo-Er and the Ni-Mo-Ce coating were less than the Ni-Mo coating, while the surfaces were more smooth.The molybdenum content of the coatings were 7.27% and 0.96% higher than Ni-Mo coating, and abrasion resistance respectively of 7.97% and 16.81%. At the same time, Ni-Mo-Er alloy plating layer and the Ni-Mo-Ce alloy coating improved the friction coefficient of Ni-Mo alloy plating decreased by 11.84% and 10.42%. Currently, the study on pulse plating Ni-Mo-Er and Ni-Mo-Ce coating has not been reported.
Keywords: Pulse electroplating; Er; Ce; Nickel-molybdenum alloy
目 录
1 引言 1
1.1 镍、钼及钼合金 1
1.1.1 镍的物理化学性质 1
1.1.2 钼的物理化学性质 1
1.1.3 钼合金的性质及应用 2
1.2 镍钼合金的制备 3
1.3脉冲电镀的主要工艺研究和发展现状 3
1.4镍钼电镀中添加稀土的主要研究与发展状况 4
1.4.1 稀土的介绍 4
1.4.2 稀土在电镀中的作用 4
1.4.3 稀土添加剂发展状况 5
1.5主要研究的内容 6
2 实验部分 7
2.1 实验试剂与设备 7
2.1.1 实验试剂 7
2.1.2 实验设备 7
2.2 实验装置与材料 8
2.2.1 实验装置 8
2.2.2 实验材料 8