脉冲电沉积Ni-Mo-MoSi2复合镀层制备工艺的研究 摘要：采用机械搅拌器的脉冲电沉积法在镍基高温合金上制备了Ni-Mo-MoSi2复合镀层，考察了表面活性剂浓度、pH值、温度、转速、电流强度、频率、占空比、电镀时间、MoSi2微粒浓度对复合镀层硬度的影响。并分别采用扫描电镜(SEM)、电子能谱仪(EDX)，X-射线衍射仪(XRD)及摩擦磨损仪分析了复合镀层的微观形貌、成分、结构和耐磨性能。得到以下结论：制备Ni-Mo-MoSi2复合镀层的最佳工艺条件是PEG6000浓度为0.2g/L，pH值为8.9，温度为40℃，转速为275r/min，电流强度为0.74A，频率为5000Hz，占空比为1/2，电镀时间为20min，MoSi2浓度为8g/L。在此工艺条件下Ni-Mo-MoSi2复合镀层硬度为779.8HV，MoSi2含量为4.3%。能谱结果表明镀层中含有Ni，Mo，Si，说明制备的镀层为Ni-Mo-MoSi2复合镀层。Ni-Mo-MoSi2复合镀层中Mo元素含量为22.89%。X衍射结果表明Ni-Mo-MoSi2复合镀层为晶态结构。摩擦磨损实验结果表明Ni-Mo-MoSi2复合镀层的耐磨性优于Ni-Mo合金镀层，与Ni-Mo合金镀层相比其磨损量下降了33.96%。扫描电镜结果表明Ni-Mo-MoSi2复合镀层表面分布着复合粒子，Ni-Mo-MoSi2复合镀层表面颗粒比Ni-Mo合金镀层表面颗粒更细。
创新点：
目前有关应用电沉积法制备Ni-Mo-MoSi2复合镀层的文献还未见报道。
关键词：脉冲电沉积；复合镀；MoSi2；热膨胀系数
Study on pulse Electrodeposition and Property of Ni-Mo-MoSi2 Composite Coating
Abstract : In this paper, Ni-Mo-MoSi2 composite coatings were prepared as the bond coating by pulse plating method. The effects of different concentration of surfactant、pH value 、temperature、 stir speed 、current density、frequency、 duty-cycle ,plating time, concentration of MoSi2 on the property of composite coatings were studied, and the optimal operating conditions were found . The morphology surface, compositions and structure, wear resistance of composite plating were analyzed by scanning electron microscopy (SEM). Energy Disperse X-ray detectors (EDX), X-ray diffraction (XRD) and Friction and wear Tester. From the research, the optimal operating conditions: PEG6000 is 0.2g/L ,pH value is 8.9、temperature is 40℃、 stir speed is 275r/min、current density is 0.74A、frequency is 5000Hz、 duty-cycle is 1/2, plating time is 20 mins, concentration of MoSi2 is 8g/L, The maximum hardness and MoSi2 content of Ni-Mo-MoSi2 are 779.8HV and 4.3% respectively. SEM shows that the surface of the Ni-Mo-MoSi2 composite coatings filled with many particles which are made up of Ni，Mo，MoSi2. The particles on the surface of the Ni-Mo-MoSi2 composite coatings are finer than Ni-Mo alloy coatings.EDX shows coatings are composed of Ni，Mo，Si, which illustrates that the coatings are Ni-Mo-MoSi2 composite coatings. The Mo content in the Ni-Mo-MoSi2 composite coatings is 22.89% respectively.XRD indicates that Ni-Mo-MoSi2 composite coatings is crystalline, frictional wear shows that Wear resistance of Ni-Mo-MoSi2 were better than Ni-Mo coatings, The wear weight loss of Ni-Mo-MoSi2 coatings were lower than Ni-Mo coatings
Creative ideas in this paper:
The current literatures about the preparation of Ni-Mo-MoSi2 composite Coating by pulse Electrodeposition have not been reported.
Keywords：Pulse Electrodeposited; composite coating; MoSi2; thermal expansion coefficient
目 录
1 前言1
1.1 脉冲复合镀的基本原理1
1.1.1 脉冲复合镀的概念1
1.1.2 复合镀的机理及特点1
1.1.3 影响复合镀的因素2
1.2 脉冲复合镀的工艺研究现状3
1.2.1 高硬度耐磨性复合镀3
1.2.2 耐高温复合镀层5
1.2.3 耐腐蚀复合镀层5
1.2.4 电接触功能复合镀层6
1.3 二硅化钼的性能及应用 6
1.4 本课题研究内容和意义 8
2 实验部分9
2.1 仪器与试剂 9
2.1.1 实验仪器 9
2.1.2 实验试剂 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11
2.3.1 MoSi2微粒的前处理 11
2.3.2 电镀液配制11
2.3.3 镍片的镀前处理12
2.3.4 电镀过程12
2.3.5 电镀后处理13
2.4 复合镀工艺条件的选择13
2.4.1 电沉积Ni-Mo-MoSi2复合镀层工艺条件的选择13
2.5 复合镀层的测试及表征14
2.5.1 复合镀层微观形貌的观察14
2.5.2 复合镀层组成成份分析 14
2.5.3 复合镀层结构分析 14
2.5.4 复合镀层的磨损量的测定 14
3 结果与讨论15
3.1 工艺参数对Ni-Mo-MoSi2复合镀层硬度的影响 15
3.1.1 表面活性剂浓度对复合镀层硬度的影响 15
3.1.2 PH值对复合镀层硬度的影响 15
3.1.3 温度对复合镀层硬度的影响 16
3.1.4 转速对复合镀层硬度的影响 17
3.1.5 电流强度对复合镀层硬度的影响 18
3.1.6 频率对复合镀层硬度的影响 18
3.1.7 占空比对复合镀层硬度的影响 19
3.1.8 电镀时间对复合镀层硬度的影响 20
3.1.9 MoSi2浓度对复合镀层硬度的影响 20
3.2 复合镀层的成分分析 21
3.3 复合镀层的结构分析22
3.4 复合镀层磨损量分析23
3.5 复合镀层的形貌分析24
4 结论 26
致谢 27
参考文献 28，3579
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