共查询到20条相似文献,搜索用时 140 毫秒
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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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介绍了一种以氢氧化钠、氧化锌为主盐的无氰镀锌工艺.测定该工艺镀液的电流效率、镀层沉积速率、镀液的分散能力、镀液的深镀能力以及镀液的稳定性的结果表明,该无氰镀锌镀液的电流效率与镀层沉积速率都较高,镀液的分散能力和镀液的深镀能力较好,且该镀液的稳定性较好.对锌镀层的结合力、耐蚀性能作了测定,结果表明该锌镀层结合力较好,具有良好的耐腐蚀性能. 相似文献
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本文介绍无铵宽温度的氯化钾盐镀锌镍合金工艺,并讨论了镀液成分和操作条件对镀层的影响,以及镀液的深镀能力和均镀能力及沉积速率等性能,实践证明本工艺是代替镜镀层的理想镀层。 相似文献
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复合电沉积制备纳米钡铁氧体/钴镍合金磁性镀层 总被引:1,自引:0,他引:1
采用复合电沉积技术制备了纳米钡铁氧体(BaFe_(12)O_(19))/钴镍合金磁性镀层,研究了纳米钡铁氧铁颗粒对镀层表面形貌及磁性能的影响和镀液中BaFe_(12)O_(19)颗粒含量、电流密度、镀液温度、施镀时间等电沉积工艺参数对复合镀层矫顽力和最大磁能积的影响。结果表明:镀液中加入纳米钡铁氧体颗粒通过优化电沉积工艺可以制备出磁性复合镀层,可明显提高镀层的最大磁能积和矫顽力;以上四种工艺参数对镀层的最大磁能积和矫顽力有明显影响,但影响规律各不相同。 相似文献
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在早先的文献中,虽曾提及将酒石酸钾钠加入锌酸盐镀锌溶液中可使镀层光亮细致,但未见它对镀液及镀层性能影响的系统研究资料。本文将其作为锌酸盐镀锌添加剂进行了深入研究,根据实验提出一个新的镀锌工艺。 相似文献
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Sagar A. Gadkari Taysir H. Nayfeh 《The International Journal of Advanced Manufacturing Technology》2008,39(1-2):107-117
We report improvement of the acoustic liquid manipulation (ALM) assisted electroplating process for micro fabrication. We refined the process and were able to achieve a plated dot size of 0.031 inches, using highly backed ultrasonic transducers. This potential tool-less fabrication (TLF) technique will reduce the need for masking and can be used for rapid prototyping of microstructures. We report the plating of copper on steel plates. An ion-depleted layer is formed at the cathode when the electroplating process starts, thus forming a natural mask. A fine stream of fresh electrolyte formed by acoustic streaming by an ultrasonic transducer is directed to refresh the ion-depleted layer at the cathode. This causes the plating process to continue at a localized point. The thickness of the plating increases with time. The process can be automated by mounting the transducer assembly on a three dimensional control system. This will enable rapid fabrication of three dimensional micro structures and shapes by the direct writing method. 相似文献
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fe-ni-w合金代铬镀层的清洁电镀生产工艺与性能研究 总被引:1,自引:0,他引:1
在中国国家高技术发展计划(863计划)项目“水溶液电沉积法生产薄膜磁性材料”,中国国家科技支撑项目“含有毒有害元素材料的替代技术”共同支持下,针对镀铬的严重环境污染问题,以环境友好和可持续性制造为目标,提出Fe Ni W合金代铬镀层的清洁电镀方案,研究了电镀的机理、工艺、镀层结构及性能,并将该工艺推广到工程应用。 电沉积机理研究表明,Fe Ni W的电沉积是通过活性中间体完成的。W在水溶液中不能单独沉积,但可以同时与Fe、Ni发生共沉积,即诱导共沉积;Fe Ni W合金通过活性物质[(Fe)(Ni)(HWO4)(Cit)2]3-的电化学还原生成三元络合物;Fe元素和Ni元素通过两种平行的电化学反应途径沉积出来。合金中的各种组分均匀混合,形成非晶态的FeNiW三元固溶体结构。 所提出的Fe Ni W电沉积溶液配方,从源头上消除Cr6+电镀所造成的污染。研发出镀前阳极活化处理工艺,镀后热处理工艺,中间自动检测及补加系统和筒式电镀法,实现了钨合金电镀稳定和清洁生产。 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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镁及其合金表面综合防护性差,表面强化处理成为镁制品加工业中不可或缺的重要环节,化学镀因其众多技术优势在轻合金的表面改性中具有重要地位,但经典的化学镀工艺存在工序繁杂、毒性大、成本高等诸多弊端,针对镁合金化学镀工艺技术中存在的主要问题,对镁合金化学镀展开以低污染、低成本为主要目标的研究。结果表明,改变现有化学镀的镀前处理方式,同样可以实现化学镀镀层的顺利生长,从而以更加环保的方式,在镁合金表面获得致密、光滑、均匀的合金镀层。 相似文献
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Amir Hadadzadeh Mary A. Wells Vignesh Jayakrishnan 《The International Journal of Advanced Manufacturing Technology》2014,73(1-4):449-463
A previously developed and validated thermal-fluid mathematical model of the twin roll casting (TRC) process for magnesium alloy AZ31 was used to quantitatively study the feasibility of producing a clad magnesium strip via the TRC process. The clad material was varied to identify the effect of material composition on the feasibility of producing a clad strip. The clad alloys chosen included pure Zn, pure Al, AA3003, and AA5182 aluminum alloys. In the analysis, the effect of casting speed and clad sheet thickness (100 and 500 μm) on the thermal history in the magnesium strip and clad layer was analyzed. Assessment of the process feasibility was determined based on the exit temperature of the clad strip at the centerline, temperature of the clad sheet prior to the roll bite entry, and fraction solid of both the core (magnesium sheet) and clad along the core/clad interface. The results indicated that using pure Zn as a clad material is not feasible due to premelting of the clad strip prior to introduction into the TRC apparatus. All three aluminum alloys studied proved to be feasible in terms of a clad material, and it was found that the effect of clad thickness and clad material chemical composition on the thermal history (temperature distribution) of the clad strip was negligible. It was also predicted using the thermodynamics package FactSage? that the intermetallic phase at the core/clad interface will be primarily γ-Mg (Mg17Al12). For AA5182 clad material, formation of β-Mg (Al3Mg2) is also possible. 相似文献