共查询到19条相似文献,搜索用时 93 毫秒
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介绍了适用于输配电铜及铜合金件镀银工艺,其流程主要包括化学除油、盐酸活化、混酸酸洗、氰化镀铜、氰化镀银、电解钝化.说明了各工艺的操作条件及注意事项.给出了银镀层变色后的处理,不合格品的褪镀方法,以及镀层抗变色性能、结合力和显微硬度的测试方法.指出了该工艺对环保方面的要求.针对实际生产中遇到的漏镀和镀层有少量颗粒的问题,... 相似文献
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为了保持镀银件良好的工作性能和外观,都必须防变色处理,通常有五、六种处理方法,但化学钝化法用得量多。经化学钝化后银层表面生成一层由Ag2O、Ag2CrO4、Ag2Cr2O7等组成的钝化膜,以隔离银镀层表面与腐蚀介质的接触,从而防止银变色。该工艺单独使用时抗变色很差,若配合其它防变色工艺,效果较理想。 相似文献
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四、镀银和银层防变色处理。介绍了银-氧化镧复合电镀工艺代替镀银;另外还介绍了一种新的防银变色工艺,据称在H_2S 100 PPM和SO_2 700 PPM中72小时不变色,室内暴露3个月亦不变色。五、可焊性镀层。介绍了酸性光亮镀锡、酸性光亮镀锡铈合金,酸性光亮镀锡锑合金、光亮镀锡铅合金等4种工艺。六、化学镀。介绍了化学镀镍,包括镍磷合金和镍硼合金以及含SiC的复合镀层;化学镀铜和非金属材料化学镀的活化新工艺,包括酸性胶体钯和盐基型胶体钯以及代银活化剂。 相似文献
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推荐一种防银变色处理工艺 总被引:4,自引:0,他引:4
寻求一种价廉物美,简便易行的防银变色处理工艺是当今国内外电镀界共同研究及亟待解决的科研项目之一。本文对几种不同的工艺进行了对比实验,根据归纳比较,推荐“浸渍法”防银变色工艺,谨供有关生产或科研部门进行防银变色工艺决择时参考。 相似文献
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氰化镀银具有与众不同的技术要求,因而操作较难掌握。本文介绍了其承处理工艺,归纳了不同基材,不同工艺制件上的镀银工艺,并强调了防变色处理的意义。 相似文献
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利用红外光谱、X-射线衍射、热重-差热分析-质变联用及透射电镜等分析手段,研究了山嵛酸银的热分解过程。红外光谱、X-射线衍射以及热重-差热分析结果表明,加热山嵛酸银产生了复杂的结构变化,其中有2个明显的热转变过程。在138℃左右,山嵛酸银产生了第1个热转变,即分子中烷基链从有序转变为无序状态;在231℃左右产生了第2个热转变,山嵛酸银发生了结构变化,即山嵛酸热分解。山嵛酸银的主要热分解产物是金属银和山嵛酸。热重-差热分析-质镨联用的分析结果表明,山嵛酸银热分解的气态产物为二氧化碳,水,氢气,乙炔及一些小分子烯烃。 相似文献
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史瑶 《感光科学与光化学》2010,(2)
本文对调色剂酞嗪(PHZ)在苯并三氮唑银(AgBTA)光敏热显影体系中的作用机理进行了初步研究.通过SEM,IR,XRD分析结果表明,PHZ与AgB-TA生成银复合物从而发挥显影促进作用.该复合物可以改变AgBTA颗粒的形状.生成的银复合物具有与AgBTA相同的晶体结构. 相似文献
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Kateina Malachov Petr Praus Zuzana Pavlí
kov Martina Turicov 《Applied Clay Science》2009,43(3-4):364-368
The activities of antibacterial compounds, such as cetylpyridinium (CP), cetyltrimethylammonium (CTA), silver ions and metallic silver, immobilised on montmorillonite (MMT), were tested in Escherichia coli and Enterococcus faecium bacteria. The results of bacterial growth tests were confirmed by determination of the minimum inhibition concentrations (MICs). Unlike CP and CTA, the intercalated silver ions were easily released from MMT by ion-exchange with Na+ and acted as very effective antibacterial substances in the long term. Their bactericidal and bacteriostatic effects were determined. Generally, antibacterial compounds are effective when they are released from an inorganic carrier. Metallic silver was prepared by reduction of intercalated Ag+ with sodium borohydride. Antibacterial effects of metallic silver were not observed. 相似文献
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A study on the effect of compositing silver oxide nanoparticles by carbon on the electrochemical behavior and electronic properties of zinc‐silver oxide batteries 下载免费PDF全文
Masoud Sabzi Saeid Mersagh Dezfuli 《International Journal of Applied Ceramic Technology》2018,15(6):1446-1458
In this study, the effect of compositing silver oxide nanoparticles by carbon on the electrochemical behavior and electronic properties of zinc‐silver oxide batteries have been investigated. For this purpose, firstly four silver oxide electrodes containing 5, 10, 15, and 20 wt% carbon powder were produced by powder metallurgy method. For the next step, all four silver oxide electrodes were sintered at 500°C for 10 minutes. Afterward and in order to investigate the microstructure, phase and elemental analysis of the electrodes were carried out using Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), X‐ray Diffraction (XRD), and Energy Dispersive Spectroscopy (EDS), respectively. Moreover, in order to investigate the effect of compositing silver oxide nanoparticles by carbon on the electrochemical behavior and electronic properties of zinc‐silver oxide, electrochemical tests (potentiodynamic polarization and electrochemical impedance spectroscopy) and electric discharge test in 1.4 wt%KOH electrolyte were carried out respectively. The microstructural observations revealed that increasing carbon content in the silver oxide electrodes results in increasing the apparent porosities in these electrodes. Investigating the phase and elemental analysis results showed that by increasing the content of carbon in the silver oxide electrode, the amount of Ag2O and AgO phases in this electrode reduces and also the extent of pure silver formation increases. Investigations on the results of electrochemical tests showed that increasing carbon content results in the reduction of corrosion resistance in silver oxide electrodes. Moreover, the results of electric discharge test revealed that the silver oxide electrode containing 10wt% carbon yields the highest energy efficiency in the zinc‐silver oxide batteries. 相似文献