电沉积Ni-Mo-Al镀层的研究+文献综述
毕业论文关键词： 脉冲电沉积；Ni-Mo-Al合金镀层；耐高温性能
Study on the process of Mo-Ni-Al planting
Abstract：The preparation of Ni-Mo-Al alloy pulse electroplating, studied the influence of electroplanting conditions on the content of Al in the Ni-Mo-Al coating, and determine better process conditions. The results show that when the value of pH is 8.2, the concentration of AlCl3 is 3g/L, the current density is 18.5A/dm2, the frequency is 5000Hz, the duty cycle is 1/2, time of plating is 20min, the planting solution temperature is 26 ℃, the largest content of Al in Ni-Mo-Al alloy coating is 2.04%.By scanning electron microscope(SEM), electron spectroscopy(EDX),X ray diffraction(XRD),friction wear tester and thermal expansion instrument(DIL) on the coating surface morphology, composition, phase structure, wear resistance, thermal expansion properties was investigated, the results showed that: compared with Ni-Mo alloy coating, Ni-Mo-Al coating surface nodules of reunion coating become smaller ,and has decreased obviously, the surface is not smooth, Mo decreased 47.29%,Ni increased 16.73%, the morphology of Ni-Mo-Al coating is amorphous structure, compared with the 2θ of the diffraction peak in the Ni-Mo alloy coating, 2θ of Ni-Mo-Al diffraction peak has shifted in different degrees, the wear of Ni-Mo-Al coating increased by 21.53%, The friction coefficient is decreased from 0.816 to 0.540，while the Ni-Mo-Al coating has good high temperature performance, engineering thermal coating coefficient order range in 30-1300℃ expansion is：Tα(Ni-Mo-Al)(-5.594×10-5)>Tα(Ni-Mo)(-6.804×10-5)
Keywords: pulse plating; Ni-Mo-Al; coating; High temperature resistant performance.
目 录
1 引言 1
1.1 合金电镀的介绍 1
1.1.1 合金电镀 1
1.1.2 合金共沉积的条件 1
1.1.3 钼及镍钼合金 2
1.2 Ni-Mo合金镀工艺研究现状 2
1.3 热障涂层的介绍 3
1.4 粘结层对热障涂层的作用 4
1.5 Al在粘结层中的应用 4
1.6 工艺条件对电镀法制备合金镀层的影响 5
1.7 本课题研究内容 6
2 实验部分 7
2.1 实验材料及试剂 7
2.1.1 实验材料 7
2.1.2 实验试剂 7
2.2 实验设备与装置 7
2.2.1 实验设备 7
2.2.2 实验装置 8
2.3 工艺过程 8
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