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A process for electroplating amorphous gold-nickel alloy with the atomic ratio of unity was developed. The plating bath was prepared by adding potassium cyanoaurate(I) into a known plating bath which produces amorphous nickel-tungsten alloy. At a sufficiently high gold concentration, the alloy deposit did not contain any tungsten. The amorphous nature of the Au-Ni alloy produced in the new bath was confirmed by using TEM and THEED. Hardness, resistivity, and contact resistance of this new alloy were determined, and the results are discussed for applications as an electrical contact material. 相似文献
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Noriyuki Yamachika Junji Sasano Masaru Kato Tetsuya Osaka 《Electrochimica acta》2008,53(13):4520-4527
It was found that, by choosing an optimum bath composition, amorphous Au-Ni alloy containing up to 40 at.% of Au with respect to the sum of Au and Ni can be electrodeposited from a bath prepared by excluding tungsten from the Au-Ni-W bath that we developed previously. Elemental analysis showed that the deposit contains 15-20 at.% of carbon and 2 at.% of nitrogen. Hardness of this deposit is almost three times as high as that of the conventional hard gold. The electrical contact resistance measured against a pure gold wire is comparable to that of the hard gold. The amorphous structure of the Au-Ni deposit is stable at temperatures up to 300 °C for at least 1 h. The amorphous tungsten-free Au-Ni deposit is worthy of consideration for applications in the fabrication of micro- and nano-scale electrical contacts. 相似文献
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亚硫酸盐电镀Au-Cu合金工艺研究 总被引:1,自引:0,他引:1
实验了一种无氰亚硫酸盐电镀金-铜合金工艺,利用X-射线荧光光谱仪、金相显微镜、显微硬度计等检测了镀层的金含量、表面形貌及硬度等性能。结果表明,镀液分散能力和深镀能力良好,镀层呈金黄色外观,硬度高,结合力较好,节约了黄金,适宜做装饰性镀层。 相似文献
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Co-B纳米合金功能膜化学沉积和电沉积的比较 总被引:1,自引:0,他引:1
以硫酸钴、硼氢化钠为主要原料,对电沉积和化学沉积Co-B纳米合金功能膜进行比较,发现尽管电沉积较化学沉积的速度快,但各影响因素和变化规律是一致的。pH值增大和温度的升高会加快沉积速率,络合剂浓度增大则会降低沉积速率,增加硫酸钴、硼氢化钠的浓度都会加快沉积速率,但用化学法沉积时,当硫酸钴、硼氢化钠的浓度超过最大值时,沉积速率反而下降。XRD结果表明,两种方法制备的Co-B纳米合金在镀态下都是非晶态,其结构并不受沉积方法的影响,SEM、STM和AFM观察发现,非晶膜镀层是由纳米相微粒构成微米级的二次颗粒,二次颗粒堆砌形成薄膜。化学沉积得到的颗粒相对电沉积得到的要小一些,两种方法得到的最大颗粒都不超过3 μm。 相似文献
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甲基磺酸盐电镀锡银合金工艺的研究 总被引:5,自引:0,他引:5
随着电子电镀工业的飞速发展,镀层质量的要求也越来越高,尤其是在可焊性方面更为突出.研究了一种环保型的电镀工艺,获得的锡银合金镀层具有很好的可焊性,而且该镀液的稳定性相当好,为可焊性镀层的发展提供了一个新的方向. 相似文献
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连续电镀锌镍合金的研究 总被引:4,自引:0,他引:4
提出了一种高氯化铵弱酸型镀液体系连续电镀锌镍合金工艺,研究了m(Ni^2 )/[m(Ni^2 ) m(Zn^2 )]、氯化铵浓度,电流密度、温度、PH值对镀层镍含量的影响,推导出连续镀的镀速计算公式,采用此工艺可获得外观良好、镍含量在13%-15%的锌镍合金镀层。 相似文献
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高速电镀钯-镍合金工艺 总被引:1,自引:0,他引:1
由于金用作电子连接接触表面镀层,成本高,电镀钯-镍合金已成为最具吸引力的接触材料的替代品。然而,传统氨系电镀钯-镍工艺和新的无氨电镀钯-镍工艺有许多环保特征未能达到最佳。与早期电镀钯-镍合金相比,低氨高速电镀钯-镍合金工艺具有技术性能卓越,物料消耗降低和环境状况改善等优势。 相似文献
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钢铁浸镀铜锡合金工艺研究 总被引:4,自引:0,他引:4
采用硫酸铜、硫酸亚锡为主盐,加入络合剂、光亮剂、锡盐稳定剂,研究成功了一种新的浸镀铜锡合金工艺。探讨了主要成分的影响,检测了镀液镀层性能。所形成的浸镀层结晶细致、光亮,为银白色镀层,与钢铁基体结合力好,覆盖能力高,与其它镀层配套性好,是一种替代氰化镀铜锡合金的新工艺。 相似文献
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银及金合金基体镀金和镀铑的工艺探讨 总被引:1,自引:1,他引:1
提出银件镀金,镀铑工艺流程和配方,介绍了金合金镀金工艺,镀前处理,操作要点、强调中间镀层能有效防止银基体的腐蚀和镀件变色。 相似文献
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A pretreatment with galvanostatic etching is recommended to obtain an adherent and uniformly covered copper deposit on pure magnesium and magnesium alloy specimens (AZ31 and AZ61) in an alkaline copper-sulfate bath. The effect of galvanostatic etching on the surfaces of Mg and Mg alloy specimens can be realized by their potential variation during galvanostatic etching, in which four distinct stages could be distinguished. Galvanostatic etching to stage III, an activated surface of Mg or Mg alloy, was obtained for electroplating a uniformly covered Cu deposit in the alkaline Cu-sulfate bath. The Cu-deposited Mg or Mg alloy was used as the substrate for further Cu and then Ni electrodeposition in acid plating baths to obtain a protective Ni/Cu coating. The proposed electroplating baths are environmentally friendly, and the electrodeposition process is easy to conduct to achieve a protective coating for Mg and Mg alloys. 相似文献