共查询到19条相似文献,搜索用时 171 毫秒
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影响镍镀层内应力的因素及排除方法 总被引:8,自引:0,他引:8
镀镍层内应力对其性能影响较大简单介绍了镀层内应力的一种定性测定方法-条形阴极法,并列出了其半定量的计算公式分析了影响镀镍层内应力的几种因素:电镀光亮剂、pH值、电流密度、温度及杂质提出了相应的排除方法,并指出重视镀液的维护与管理是有效控制镀层内应力的主要方法。 相似文献
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超声波对镍镀层硬度的影响 总被引:1,自引:1,他引:0
分别在超声波和无超声波条件下,制备了镍镀层。通过镍镀层硬度测试、金相组织观察和镀层内应力的测定,分析了超声波条件下镍镀层硬度提高的影响因素。实验结果表明:增加超声波功率,导致镀层硬度增大。在超声波作用下,镍镀层的晶粒细小,镀层呈现压应力状态。镍镀层晶粒细化、加工硬化和存在压应力是超声波电镀镍层硬度提高的主要因素。 相似文献
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化学镀Ni-P合金镀层内应力的研究 总被引:4,自引:0,他引:4
采用薄片弯曲法测量不同pH值和不同热处理对化学镀镍层内应力的影响,分析了产生变化的原因.结果表明,当镀液pH值为3.8~4.1和4.4~4.6时,镀层受到的内应力为压应力,而当镀液pH值为4.8~5.1时,镀层受到的内应力为拉应力.镀液pH值越高,镀层中磷含量越低,其内应力越高.经过200℃×1 h热处理,镀层的内应力减小;经过400℃×1 h或600℃×1 h热处理,镀层的内应力增大. 相似文献
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1镀镍电解液的温度如何控制? 答:不同的镀镍工艺所采用的镀液温度不同,温度的变化对镀镍过程的影响比较复杂.在温度较高时获得的镍镀层内应力低,延展性好,50℃时镀层的内应力达到稳定,一般操作θ在55~60℃. 相似文献
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介绍了叠层片式电感三层端头电极即银基底电极、镍层、锡-铅合金镀层的性能及制备工艺。提出三层端头电极的质量控制,并分析了常见的质量问题。银端头的质量取决于合适的银端`浆烧成曲线和烧结气氛;镀镍层应有较低的内应力,镀镍层内应力受镀镍液各成分浓度、无机杂质、有机杂质和pH值的影响;MLCI端头电极锡-铅合金电镀工艺及维护,镀后的清洗、MLCI的储存影响镀层的耐焊性和可焊性,对锡-铅合金镀层的耐焊性和可焊性进行了检验以获得合格的MLCI产品。 相似文献
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一、概述镍镀层具有悠久的应用历史,人们对镍镀层认识从感性到理性也就越来越深入,越来越丰富,在国外对镀镍溶液成份研究表明,溶液中钠离子对镀镍层结构有较大的影响。早在本世纪七十年,在英、美,有关文献中已明确指出,镀液中的钠离子会使镍镀层产生呈层状纤维结构,因而镀层内应力高、结合力差、脆性大。为避免钠离子对镍镀层结构的影响,国外一般都已采用不含钠离子的镀镍工艺。但在我国却仍有相当多的镀镍溶液采用含钠离子的工 相似文献
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The effects of boric acid additions on the pH close to the electrode surface, on the hydrogen evolution reaction and on the internal stress in the plated films were studied for the high speed electroplating of nickel from a nickel sulfamate bath at a current density close to the nickel ion limiting current density. The study was carried out at 50 °C and pH 4.0 using a 1.55 M nickel sulfamate plating bath containing boric acid at concentrations ranging from 0 to 0.81 mol L–1. The variation of the internal strain in the plated nickel films was determined in situ using a resistance wire-type strain gauge fitted to the reverse side of the copper electrode substrate. The solution pH at a distance of 0.1 mm from the depositing nickel film was measured in situ using a miniature pH sensor assembly consisting of a thin wire-type antimony electrode and a Ag/AgCl/sat. KCl electrode housed in a thin Luggin capillary. The addition of boric acid was shown to effectively suppress the hydrogen evolution reaction at nickel electrodeposition rates (18.0 A dm–2) close to the limiting current density (~20 A dm–2). Consequently, the solution pH adjacent to the plating metal surface was maintained at a value close to that in the bulk solution and the development of high internal stresses in the deposited nickel films was avoided. 相似文献
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低速电沉积钯镍合金工艺的研究 总被引:2,自引:0,他引:2
通过极化曲线研究了钯、镍的电沉积行为.讨论了钯镍浓度比、pH值、电流密度、沉积电势等工艺参数对低速电沉积钯镍合金组成的影响.结果表明:与钯相比,镍的极化大,极化度也大;电沉积合金时,钯催化镍的沉积,而镍阻化钯的沉积.合金组成是各工艺参数的函数,镀液中钯、镍离子浓度比是影响合金成分的主要因素.随着镀液中Ni/Pd值的增大,合金中镍含量呈线性增加;pH值升高,合金中镍含量降低;电流密度增大或者沉积电势负移,合金中镍含量增加;沉积电势对合金成分的影响更显著,成分更易控制. 相似文献
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Grimshaw P Calo JM Shirvanian PA Hradil G 《Industrial & engineering chemistry research》2011,50(16):9525-9531
An investigation is presented of nickel electrodeposition from acidic solutions in a cylindrical spouted electrochemical reactor. The effects of solution pH, temperature, and applied current on nickel removal/recovery rate, current efficiency, and corrosion rate of deposited nickel on the cathodic particles were explored under galvanostatic operation. Nitrogen sparging was used to decrease the dissolved oxygen concentration in the electrolyte in order to reduce the nickel corrosion rate, thereby increasing the nickel electrowinning rate and current efficiency. A numerical model of electrodeposition, including corrosion and mass transfer in the particulate cathode moving bed, is presented that describes the behavior of the experimental net nickel electrodeposition data quite well. 相似文献
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Here we describe a new method for preparing multiple arrays of parallel gold nanowires with dimensions and separation down to 50 nm. This method uses photolithography to prepare an electrode consisting of a patterned nickel film on glass, onto which a gold and nickel nanowire array is sequentially electrodeposited. After the electrodeposition, the nickel is stripped away, leaving behind a gold nanowire array, with dimensions governed by the gold electrodeposition parameters, spacing determined by the nickel electrodeposition parameters, and overall placement and shape dictated by the photolithography. 相似文献
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硫酸盐电铸镍内应力的影响因素 总被引:1,自引:0,他引:1
研究了NiSO4·6H2O质量浓度、NiCl2·6H2O质量浓度、温度和阴极电流密度等工艺参数对硫酸盐电铸镍层内应力的影响。通过铜箔阴极弯曲法半定量地测定了镍铸层的内应力,采用扫描电镜和X射线衍射表征了镀层在不同应力状态下的表面形貌和微观结构。结果表明,当NiSO4·6H2O质量浓度为100~150g/L时,其变化对内应力影响较大;镀液中氯离子浓度的增加会增大镀层内应力;低温和大电流密度条件下获得的镀层具有大的拉应力,高温小电流则有利于降低镀层的拉应力。 相似文献
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以紫铜片为基体,采用脉冲电沉积方法制备了钯-镍合金膜层。选取占空比和脉冲频率作为变量,分别研究了占空比和脉冲频率对钯-镍合金膜层的孔隙率和内应力的影响。结果表明:随着占空比的增大,孔隙率升高,内应力先减小后增大;随着脉冲频率的提高,孔隙率明显降低,内应力增大;当占空比为20%~30%、脉冲频率为1.0 kHz时,采用脉冲电沉积方法能制备出适用于微机电器件的钯-镍合金膜层。 相似文献