共查询到19条相似文献,搜索用时 93 毫秒
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用电镀方法制备锡锰合金镀层,用扫描电镜观察其表面自然生长的晶须,分析基体表面粗糙度、搅拌、电流密度参数等对晶须生长的影响。结果表明,增大电流密度可提高晶须密度,这与镀层结晶组织密切相关。 相似文献
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一、概述 含Ni8-10%的碱性锌镍合金镀层,具有工艺性能稳定、镀层光亮、镍共析稳定、抗蚀性能好等显著特性,容易进行彩色钝化,经钝化后的Zn-Ni合金镀层其中性盐雾试验,出现红锈时间大于2000小时。目前广泛地应用于汽车、输电、煤矿及国防工业中。 1.溶液中金属离子浓度对合金组成的影响 通常情况下,溶液中金属离子的浓度对合金镀层的组成影响较大,碱性zn—Ni合金电镀也不例外。在HK碱性锌-镍合金电镀溶液中,锌的浓度的变化对镀层镍的影响较大,随着氧化锌浓度的不断提高,镀层中镍含量逐步下降。当溶液中氧化锌的浓度控制在6-15g/L范围内时,镀层中的镍含量为7%-12%, 相似文献
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汇流环作为一种连续传输电能与信号的电子器件,在长期转动过程中要求其表面修饰具有高耐磨性且电接触性能良好的镀层,而钯镍镀层(80/20) 就是一种理想的选择。文中探讨了汇流环表面钯镍镀层(80/20)的制备工艺。研究了镀液比例和电流密度对钯镍镀层厚度和含量的影响以及镀层厚度对钯镍成分的影响,探索了不同环结构及内外表面钯镍镀层的沉积规律。通过制备工艺选择与改进,能够得到厚2 um ~ 20 um、钯含量为77. 6% ~ 83%的钯镍镀层。最后还考察了经钯镍镀层修饰的汇流环的动态跑合情况。动态跑合70 万转,汇流环端电阻阻值为30 m赘~ 34 m赘,阻值波动小于10 m赘,测试结果符合动态跑合的技术指标。 相似文献
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用电沉积方法在316L不锈钢表面制备了纯镍镀层和纳米SiC/Ni复合镀层,考察了电镀时间、SiC质量浓度、电流密度和镀液温度对复合镀层中纳米SiC含量的影响,表征了镀层的表面形貌和SiC纳米颗粒的尺寸;最后研究了镀层的摩擦磨损性能。结果表明:复合镀层中纳米SiC的含量随着电镀时间延长、电流密度增大、镀液温度升高以及SiC质量浓度的增大先升高后降低,且最佳工艺参数为电镀时间30min,SiC质量浓度20g·L-1,电流密度2A·dm-2,镀液温度60℃,镀液pH4.5,搅拌速度300r·min-1;与纯镍镀层相比,纳米SiC/Ni复合镀层的晶粒更细小,组织更致密,具有更好的摩擦磨损性能,摩擦因数降低了7%以上,磨损率降低了50%。 相似文献
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锌酸盐电沉积锌镍合金工艺研究 总被引:1,自引:0,他引:1
本文重点研究了锌酸盐电沉积锌镍合金的镀液组成及工艺条件;各因素对镀层合金成分的影响,并测试了镀液和镀层性能;最后得到了比较理想的电镀镍合金工艺。 相似文献
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脉冲电镀及其在合金镀中的应用 总被引:1,自引:0,他引:1
本文阐述了脉冲镀合金时的质量传递和电结晶的行为,介绍了脉冲电镀所得合金镀层在组成、性质、均匀性、整平性和镀速等方面的特性,及其在电子、功能性和装饰性电镀等领域中的应用。 相似文献
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In this paper, we report the detailed investigation into the effects of plating temperature and applied current density upon
the mechanical properties of plated nickel film such as Young’s modulus and residual stresses. This method uses the resonance
method of atomic force microscope, which does not require specially microfabricated cantilevers and additional experimental
set-up. Thin layers of nickel are electroplated onto the tip surface of AFM cantilevers and plating thicknesses were measured
at the end of each plating step. The self-deformation of the released AFM cantilever is also measured as a function of the
plated nickel thickness, which is converted into the quantitative residual stress by appropriate mechanics. The measured Young’s
modulus is as high as that of bulk nickel at low plating temperature and at low applied current density, but drastically drops
at high temperature or current density. The dependence of Young’s modulus on the plating thickness is negligible in thin film
less than few microns. The residual stress is also a strong function of the process conditions, and decreased with the elevation
of the current density and plating temperature. And the intrinsic and extrinsic stresses of plated nickel are separated from
the measured residual stress, and correlated with plating conditions. Dependence of the plated thickness on Young’s modulus
and residual stress is also considered. 相似文献
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分析了目前适合细纱机钢领专件的各种表面涂层技术的发展.特别是对性价比优、摩擦系数小、耐磨、防腐的表面涂层进行了分析,列举了一些适合钢领表面涂层的新技术,如镀铬、镍磷复合镀、金刚石涂层、纳米镀膜、非晶态以及自润滑等表面处理技术,有的已经开始使用这些表面处理,而有的还需要在生产实践中进一步探索. 相似文献
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铝合金表面电沉积Ni-SiC复合镀层的研究 总被引:6,自引:0,他引:6
针对铝合金表面的电镀特点,采用化学侵锌、预镀镍等预处理方法,在铝合金表面得到了表面光洁平整,内部质量优良,与铝合金基体结合紧密的Ni-SiC复合镀层。研究了镀液中SiC浓度、电流密度、搅拌速度、镀液pH值和镀液温度等电镀参数对复合镀层厚度、镀层中的SiC体积分数及镀层显微硬度的影响。结果表明,电镀工艺条件的改变影响Ni-SiC复合镀层的共沉积速度与SiC粒子在镀层中的体积分数。当镀液SiC浓度为120g/L时,镀层中的SiC体积分数为8.5%,硬度为504.6HV,较纯铝(82.5HV)提高5倍,较纯镍(242.5.HV)提高l倍。 相似文献
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双金属材料结合了两种金属的特性从而获得远超单一金属的性能,因而在材料应用领域获得了广泛关注。如何以低成本获得高性能功能性材料是双金属推广应用的关键。以Cu30Mn70合金片材为前驱体,采用自由腐蚀和化学电镀两步法制备了金包铜纳米多孔基底(Au@NPC)。金包覆层在有效抑制铜在空气中氧化的同时,减小了韧带间孔径距离,进一步增大了紧邻韧带间的电磁耦合效应,使Au@NPC具有更强的局域电磁场增强特性,表现出优于纳米多孔铜的表面增强拉曼散射活性。金铜双金属材料可用作表面拉曼增强散射基底,具有优异的稳定性和较低的成本。 相似文献
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Multi-wire sawing with a fixed diamond wire is widely used for the mass production of wafers. In this study, a novel electrolyte jet type electroplating method was devised to improve the productivity of these wires. The method is based on increasing the limiting current density (LCD) in the electroplating unit. First, an electrolyte jet type electroplating unit was designed, and the plating characteristics were investigated. To increase the LCD during plating process, the method of decreasing the depletion layer of nickel ions around the core wire was approached. The experimental results indicated that the LCD can be increased by increasing the flow rate of the electrolyte. Next, the influences of composite plating conditions on the state of abrasive distribution and density of the diamond wires were experimentally verified, and the process of selecting the optimal fabricating conditions was clarified. Lastly, the cutting performance of the prototype diamond wires was verified by slicing a polycrystalline silicon ingot. The relationship between the surface roughness of the sliced wafers and the abrasive density of the diamond wires was studied. 相似文献
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用电刷镀技术制得了镍基 n-SiO_2复合镀层、镍基 n-SiC 复合镀层以及镍基镀层,并对镀层的滑动磨损性能进行了试验研究.纳米复合镀层的表面形貌比较细腻,镀层中纳米粒子分布均匀,与基质金属结合紧密.显微硬度高,可达到 HV692,比镍基镀层提高约50%.滑动磨损试验结果表明,纳米粒子的加入可以提高镀层的耐磨性.纳米复合镀层的磨损机制以疲劳磨损为主,而纯镍镀层以粘着磨损为主. 相似文献