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银是贵金属之一,对废镀银液应设法回收,现介绍一种简单办法。该法易掌握且回收成本低。 1原理废镀银液银以Ag(CN)_2、Ag~+、Ag(S_2O_3)_2~(3-)状态存在、在废镀液中加入Na_2S即有黑色Ag_2S沉 相似文献
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电镀银和银合金 总被引:1,自引:0,他引:1
1 前言 在装饰件或电子元件等基体上镀复银和银合金的镀液通常含有剧毒氰化物。于是人们致力于无氰镀液的研究 ,这些无氰镀液有 :(1)巯基烷基磺酸 巯基烷基羧酸镀液 ;(2 )烷基磺酸 烷基羧酸镀液 ;(3)氨基羧酸镀液 ;(4)以己内酰脲为络合剂的镀液 ;(5)以琥珀酸酰胺及其衍生物为络合剂的镀液 ;(6 )以硫代酰胺和硫醇化合物为络合剂的烷基烷磺酸 氨基磺酸镀液等 ,这些银和银合金无氰镀液存在的问题有 :(1)镀液稳定性较差 ,在较短的作业时间内便会生成黑色或者茶色沉淀 ,难以维持稳定的镀液组成 ;(2 )镀层平滑性和附着性问题 ;(3)镀液维护… 相似文献
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对传统的化学镀银工艺进行了改进,化学镀银层质量与、镀膜温度、还原剂的加入方式以及膜面积与镀液加液量之比有着密切的关系。实验结果表明控制镀膜温度(20℃以下),采用间歇式加入N2H4的方式并且增大膜面积与镀液加液量之比,这样容易控制反应速度,不易使银沉积在镀槽壁上,有利于获得厚度均匀平整、有光泽、附着力强的银/陶瓷复合膜。 相似文献
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Huiru Zhang Xinguo Zou Jingjing Liang Xiao Ma Zhiyong Tang Jinliang Sun 《应用聚合物科学杂志》2012,124(4):3363-3371
The development of a conductive fiber with flame resistance is an urgent concern particularly in national defense and other specialized fields. Aramid fibers (para‐ or meta‐) exihibit high strength and excellent fire resistance. Electroless silver plating on para‐aramid fibers and growth morphology of silver deposits was investigated in the present work. The surface of para‐aramid fibers was roughened using sodium hydride/dimethyl sulfoxide to guarantee successful electroless plating. Two complexing agents (ethylene diamine/ammonia) and two reducing agents (glucose/seignette salt) were used for the electroless silver plating bath design. Structure and properties of the resulting silver‐deposited para‐aramid fibers were evaluated based on scanning electron microscopy, silver weight gain percentage calculation, electrical resistance measurement, crystal structure analysis, and mechanical properties test. The results showed that a higher silver weight gain was advantageous to the improvement of conductivity for the silver‐deposited para‐aramid fibers. The obtained silver deposit was homogenous and compact. Electroless silver‐plating deposits were considered to be three‐dimensional nucleation and growth model (Volmer–Weber). Black, silver gray, and white deposits appeared sequentially with progressive plating. The breaking strength of silver‐deposited para‐aramid fibers remained at value up to 44 N. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 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