脉冲电镀Ni-Mo-Dy(Gd)-MoSi2复合镀层性能的研究
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