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摘要：本文采用机械搅拌的脉冲电镀方法制备Ni-Mo-Dy(Gd)-MoSi2复合镀层，研究了Dy(Gd)的浓度、电流密度、频率、占空比以及电镀时间分别对Ni-Mo-Dy(Gd)-MoSi2复合镀层硬度的影响，分别利用扫描电镜、电子能谱仪、X射线衍射仪及摩擦磨损仪对镀层进行表征。制备Ni-Mo-Dy-MoSi2复合镀层的最佳工艺为： Dy3+最佳浓度为0.4g/L，施镀时间为25min、频率为3000Hz、正向占空比为0.4、正向电流密度为13.2A/dm2；Ni-Mo-Gd-MoSi2复合镀层Gd3+最佳浓度为0.3g/L，施镀时间为20min、频率为3000Hz、正向占空比为0.5、正向电流密度为12.0A/dm2，在该条件下测得的硬度分别为838.68HV和846.2HV，与Ni-Mo-MoSi2复合镀层的硬度(618.36HV)相比，硬度分别增加了26.2%和27%。与Ni-Mo-MoSi2复合镀层相比，Ni-Mo-Dy(Gd)-MoSi2复合镀层中二硅化钼含量有所增加，耐磨损性也有所提高，且得到的镀层晶粒细小、结构致密。实验创新之处在于采用了机械搅拌器，并加入Dy(Gd)的方法得到性能更佳的复合镀层。4417
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关键词： 二硅化钼；稀土元素；脉冲电镀；复合镀
Electrodeposition and characterisation of Ni-Mo-Dy(Gd)-MoSi2 coatings
Abstract: Preparation of Ni-Mo-MoSi2 composite coating containing rare earth elements (Dy or Gd) using pulse plating method, the concentration of rare earth elements (Dy or Gd), positive duty cycle, plating time, the forward current density frequency of Ni-Mo-Dy(Gd)-MoSi2 composite coating hardness, respectively, using a scanning electron microscope (SEM), X-ray diffraction (XRD), electron spectroscopy (EDX), friction and wear tester, Netzsch DIL-402C are dilatometer of the coating characterization results show that: MoSi2 concentration of 8g /L, the temperature of 40, PH of 8.9 surface active agent of 2ml under optimal conditions were: of Dy3+ concentration0.4g/L, the plating time was 25min, the frequency of 3000Hz, the positive duty cycle is 0.4，the forward current density 13.2A/dm2; Gd3+ concentration of 0.3g/L, the plating time was 20min, the frequency 3000Hz, the positive duty cycle is 0.5, and the forward current density 12.0A/dm2. Under this condition, the measured hardness 838.68HV, 846.2HV, compared with the hardness of composite coatings obtained by adding rare earth, its hardness is increased significantly. To characterize the Ni-Mo-Dy(Gd)-MoSi2 composite coating fine grain size, compact structure, the coating, respectively, containing rare earth elements of Dy, Gd, and adding rare earth did not change its crystal form, but to improve the content of the coating of MoSi2, wear-resistant is also relative.
Key Words: Molybdenum disilicide; rare earth elements;pulse plating;composite plating
目 录
1 引言 1
1.1 复合电镀工艺介绍和现状 …1
1.2 课题研究的目的和意义 2
1.3 文献综述 2
1.3.1 天然辉钼矿MoS 2
1.3.2 纯钼 2
1.3.3 二硫化钼 2
1.3.4 二硅化钼的性质及应用 3
1.3.5 复合镀的机理及特点 …3
1.3.6 复合镀的种类 4
1.3.7 稀土在电镀中的应用 …5
1.3.8 影响复合镀层性能的因素 …5
1.3.9 脉冲复合镀的简介及机理 …7
2 实验部分 9
2.1 实验试剂与设备 …9
2.1.1 实验试剂 9
2.1.2 实验设备 9
2.2 实验材料及装置 …10
2.2.1 实验材料 10
2.2.2 实验装置 10
2.3 工艺流程 10
2.3.1 镍片的前处理 10
2.3.2 电镀液配方 …11
2.3.3 除油液配方 …11
2.3.4 电镀流程 11
2.4 复合镀工艺条件的选择 12
2.4.1 Ni-Mo-Dy-MoSi2复合镀层工艺条件的选择 12
2.4.2 Ni-Mo-Gd- MoSi2复合镀层工艺条件的选择12