纳米粒子改性镍钴电镀层的制备及性能研究

发布时间：2018-01-12 15:08

  本文关键词：纳米粒子改性镍钴电镀层的制备及性能研究　出处：《北京化工大学》2016年硕士论文　论文类型：学位论文

  更多相关文章： 纳米复合镀 工艺参数 氧化钇 氧化锆 机械性能

【摘要】：复合镀技术一直受到大家的青睐,它是一种有效的可以将合金与高硬度的陶瓷颗粒实现共沉积的表面改性技术,在保持原合金镀层优良性能的基础上,进一步提高镀层的物理、化学等机械性能,以便应对各种各样恶劣的使用环境。纳米粒子具有一系列的优良特性,将其掺杂进入镀层,会给复合镀层综合性能带来更大的提升空间,这将是未来研究的一个热点。本文是将纳米氧化物Y_2O_3和ZrO_2加入到Ni-Co合金镀层中,实现粒子与金属的共沉积。主要探究了工艺条件的改变对镀层基本性能的影响规律,探讨了纳米稀土粒子的加入对Ni-Co合金镀层的微观结构、机械性能和影响机制。本文主要研究了表面活性剂种类、pH值、稀土粒子的加入量以及电沉积时电流密度等因素对复合镀层表面形貌、镀层中粒子的含量、结构晶粒度以及镀层的硬度等性能的影响规律,获得了优化的Ni-Co/Y_2O_3和Ni-Co/ZrO_2纳米复合镀层制备工艺。主要结果如下：(1)Ni-Co/Y_2O_3复合镀层优化工艺：镀液中氨基磺酸镍,300 g/L；氨基磺酸钴,13.7 g/L；氯化镍,6 g/L；硼酸,30 g/L；十二烷基硫酸钠,0.05g/L；纳米Y_2O_3粒子,15 g/L；镀液pH值为4.0。沉积电流密度i=1.0A/dm~2,电沉积温度为45℃,沉积时间30 min。(2)Ni-Co/ZrO_2纳米复合镀层优化工艺：镀液中氨基磺酸镍,300 g/L；氨基磺酸钴,13.7 g/L；氯化镍,6 g/L；硼酸,30 g/L；十二烷基硫酸钠,0.05 g/L;纳米ZrO_2粒子,15g/L;镀液pH值为5.0。沉积电流密度i=2.0A/dm~2,电沉积温度为45℃,沉积时间30 min。(3)在优化的工艺条件下,分别制备Ni-Co/Y_2O_3和Ni-Co/ZrO_2纳米复合镀层,Y元素和Zr元素的掺入量分别为6.00%和4.08%。由于纳米粒子的加入,Ni-Co基复合镀层的晶粒得到了细化合金,其硬度也有较大的提高,其显微硬度值由349.24 HV分别提升为467.23 HV和550 HV,镀层和基体的结合强度也得到了提高,由3.92 MPa分别提升为5.08MPa和5.65 MPa,但复合镀层的耐蚀性有所降低。(4)通过对两种复合镀层性能对比可以发现,Ni-Co/ZrO_2复合镀层的硬度和结合强度较高,耐蚀性较好。这可能与Ni-Co/Y_2O_3镀层表面球状颗粒且有稍微的团聚现象有关,使其部分机械性能降低。另外,Ni-Co/ZrO_2具有较好的耐磨性,摩擦系数由原来的0.9降到0.72,磨损量由原来的0.1102 g降到0.1054 g。而Ni-Co/Y_2O_3复合镀层具有较高的抗热冲击性能,这可能与Y_2O_3具有较强的阻碍Ni向外扩散的能力,影响了氧化膜生长机制有关。
[Abstract]:Composite plating technology has been favored by everyone, it is an effective surface modification technology which can codeposit alloy and high hardness ceramic particles, on the basis of maintaining the excellent properties of the original alloy coating. Further improve the physical, chemical and other mechanical properties of the coating, in order to cope with a variety of harsh use environment. Nanoparticles have a series of excellent properties, doping them into the coating. It will bring more improvement space to the comprehensive properties of the composite coating, which will be a hot topic in the future. In this paper, the nano-oxides Ys _ 2O _ 3 and ZrO_2 are added to the Ni-Co alloy coating. Codeposition of particles and metals was realized. The influence of the change of process conditions on the basic properties of the coating was investigated. The microstructure of Ni-Co alloy coating was discussed by adding nano-rare earth particles. In this paper, the effects of the kinds of surfactants and pH value, the addition amount of rare earth particles and the current density of electrodeposition on the surface morphology and the content of particles in the composite coating were studied. The influence of the structure grain size and the hardness of the coating on the properties of the coating. The optimized preparation process of Ni-Co/Y_2O_3 and Ni-Co/ZrO_2 nanocomposite coatings was obtained. The main results are as follows: 1). Optimization process of Ni-Co/Y_2O_3 composite coating: nickel aminosulfonic acid in plating solution. 300 g / L; Cobalt sulfamate 13.7 g / L; Nickel chloride 6 g / L; Borate 30 g / L; 12 sodium alkyl sulfate 0.05g / L; Nano-Yalko _ 3 particles 15 g / L; The pH value of the plating solution is 4.0. The deposition current density is 1.0 A / d ~ (-2) and the electrodeposition temperature is 45 鈩，

本文编号：1414766