无氰镀液脉冲电镀制备金靶的研究

通过在无氰镀金液中加入合适的配位体优化镀液性能,并用脉冲电镀法制备出惯性约束聚变(ICF)金靶。讨论了该体系镀液在电镀时的温度、电流密度、极间距、频率和占空比等工艺对镀层性能的影响,利用SEM对样品的形貌进行了表征;利用电化学工作站对镀液进行了分析。得到了适合制备ICF金靶的亚硫酸盐镀金液及相应的脉冲镀金工艺的最佳条件:亚硫酸铵610 mL/L,金13 g/L,柠檬酸钾55 g/L,氨水140 mL/L,1-羟基乙叉-1,1-二膦酸(HEDP)1.32 mol/L,氨基三甲叉膦酸(ATMP)1.32 mol/L,pH=7~8,温度45℃,频率300 Hz,占空比1∶7,电流密度0.3~0.1 A/dm2,极间距6 cm。     

镀金与无氰镀金应用述评

简述了镀金历史与应用情况,镀金以其贵金属的特质,作为高级装饰性镀层和功能性镀层,无论是在传统产品领域还是在现代制造领域,都有重要的应用价值。特别是在现代电子制造和微制造中,有着重要的应用。为了环境安全而开发的无氰镀金,近年也有一些新进展,但要完全替代传统镀金工艺,尚需要进一步改进。     

FJY—18无氰电刷镀金工艺及应用

按照ＦＪＹ－１８无氰电刷镀金工艺刷２度的金镀层具有孔隙率低,色泽金黄光亮,结合力好等特点,镀厚能力大于２０μｍ,显微硬度为ＨＶ１３０－１５０。可代替有氰电刷镀金工艺用于防腐,装饰,导电,焊接,减摩,密封等领域。     

无氰镀金工艺的研究

传统的亚硫酸盐镀金液稳定性较差,就添加剂对镀液稳定性的影响进行了研究,并对镀层及镀液性能进行了测试.结果表明:镀层结晶细致,结合力、耐蚀性良好;镀液无毒、稳定性良好、分散能力和覆盖能力良好.新工艺有望取代氰化物镀金工艺,具有广阔的发展前景.     

无氰镀金工艺的研究

由于氰化物镀金含有剧毒的氰化物,为了保护工人的身体健康和减少对环境的污染,研究亚硫酸盐无氰镀金工艺,该工艺可以得到耐蚀性优良、抗变色性能好、导电性好、焊接性好、接触电阻低,且稳定、耐高温、质软、耐磨的镀金层,同时介绍了镀金时应注意的事项和影响因素.     

无氰亚硫酸钠镀金工艺

介绍了一种无氰亚硫酸盐镀金工艺的工艺流程、工艺配方、操作条件及镀液中各组分的作用。给出了镀液维护的方法及后处理工艺的配方,分析了镀金常见故障的原因,并给出了排除方法。     

无氰置换镀金工艺的研究

探讨了工艺参数对无氰置换镀金液稳定性及镀层性能的影响;采用正交试验优化工艺,得到了镀液稳定性好、镀层性能良好的中性无氰置换镀金工艺.此工艺含有能够减缓镀金初始时沉积速率,又能降低对镍层腐蚀的添加剂.     

基于无氰镀金工艺的溶液循环泵研究

在晶圆电化学沉积过程中,无氰镀金工艺对循环泵提出了更高要求,通过对比分析磁悬浮泵、磁力泵、风囊泵和隔膜泵特性及结构,磁悬浮泵镀液循环脉动小,液流平稳,泵头不会发生金属沉积现象,因此无氰镀金溶液循环常采用磁悬浮泵作为动力源。     

5,5-二甲基乙内酰脲无氰脉冲镀银工艺的研究

研究了5,5-二甲基乙内酰脲(DMH)无氰脉冲镀银工艺.结果表明:导通时间、关断时间、平均电流密度对镀层的外观有很大的影响.在最佳工艺参数下得到的脉冲镀层比直流镀层的结晶更致密,择优取向更明显.     

脉冲无氰镀银及镀层抗变色性能的研究

采用赫尔槽试验筛选出一种阴离子表面活性剂及含氮杂环化合物作为脉;中无氰镀银的添加剂,并初步确定了无氰镀银的工艺条件及脉冲条件一通过正交试验进一步化化脉冲条件及镀银添加剂含量分别为：脉宽1ms、占空比10％、平均电流密度0．6A／dm^2、阴离子表面活性剂及含氮杂环化合物含量分别为12mg/L、110mg/L测定了该镀银层的耐蚀性、抗变色性能及与基体的结合力,并用扫描电镜对其微观形貌进行了观察。结果表明,脉冲无氰镀银层的抗变色性能优于直流无氰镀银层;光亮镍打底后再脉冲无氰镀银,可获得更加光亮、结晶细致的镀银层,且抗变色性能及耐蚀性均增强.     

无氰仿金电镀的研究现状

对焦磷酸盐体系、甘油-锌酸盐体系、柠檬酸盐体系、酒石酸盐体系以及HEDP体系等无氰仿金电镀体系的各工艺规范以及3种仿金镀层钝化工艺配方进行了介绍。对离子仿金电镀工艺的优点、常用仿金离子镀镀层的种类和性能进行了概括。指出了仿金镀层各种保护漆涂覆工艺存在的问题以及无氰仿金电镀工业今后的发展方向。     

无氰电镀工艺的研究现状及解决问题的途径

本文回顾了无氰电镀工艺的发展状况。指出了当前电镀生产无氰化过程中存在的问题。介绍了当前国内外主要的无氰电镀工艺——无氰镀锌、无氰镀铜、无氰镀金和无氰镀银等工艺的技术现状,指出了今后的研发重点和解决问题的主要途径。     

导流装置应用于金属波导内腔电镀金

金属波导内腔空间小,电镀时存在严重的浓差极化现象,导致镀层厚度分布不均.在电镀金时通过增加导流装置来加快波导内腔镀液的流动和更新,获得的电镀金层厚度在1μm以上,并且分布均匀.     

高效炭滤罐的结构及其在电镀废水处理中的应用

介绍了一种具有流化床结构的新型高效炭滤罐的主要结构,给出了该炭滤罐在电镀废水处理中应用的实例。采用该炭滤罐可提高活性炭的吸附效率,减轻操作的劳动强度。它可用于冶金、化工、医药、环保等行业的活性炭吸附、固液分离、气体净化、油水分离和噪声处理,是一种多用途的实用新型设备。     

低压长袋脉冲袋式除尘器设计与应用

以工业原料尤里卡沥青(EP)为对象，详细论述了低压长袋脉冲袋式除尘器的主要设计环节，着重分析了新型脉冲阀技术。指出了该技术在化肥行业原料干燥、风扫制备等方面的推广应用和发展趋势。     

The second time derivative analysis of chemiluminescence emission profiles and its application to the accurate determination of oxidative induction times

The technique of second time derivative (STD) analysis is developed and applied to the chemiluminescence (CL) profiles of two polypropylene (PP) formulations and a 5% w/w blend of polybutadiene (PBD) in PP to assess this novel method of analysis as a means of reliably determining the oxidative induction time (OIT) of polymers. It is proposed that the STD technique, when used in conjunction with the integrated CL profile, can enable evaluations of the OIT to be made that are less subjective than those made using the conventional extrapolation method. This is particularly so in systems that exhibit a gradual onset towards autoacceleration and/or convoluted CL profiles. Chemiluminescence profiles of the PBD–PP blend that were obtained at different temperatures were subjected to STD analysis, and Arrhenius plots of the data were made. The results are consistent with the notion that the PBD and PP phases oxidize almost independently. The activation energies for the oxidation of the PBD and PP phases were calculated to be 200 ± 31 kJ mol⁻¹ and 146 ± 9 kJ mol⁻¹, respectively. The higher activation energy for the PBD phase is partly attributed to the greater partitioning of thermal stabilizer in this phase. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1986–1993, 2001     

新型粉煤灰絮凝剂的制备及其应用研究

以粉煤灰为主要原料制备复合无机高分子絮凝剂--聚硅磷氯化铝铁(PSPAFC),通过正交实验考察了原料的最佳配比,并对活化过程中的pH范围进行研究.结果表明,制备聚硅磷氯化铝铁的最佳原料配比为n(SiO2):n/(Al+Fe)为2:1,n(Al):n(Fe)为7:3,n(P):n(Al+Fe)为3:20,活化硅酸的最佳p...     

Synthesis of poly(glycerol methacrylate) and its application to dimensional stabilization of wood

The dimensional stabilization of wood is investigated using poly(glycerol methacrylate) (PGMA) prepared from polyglycerol and glycidyl methacrylate instead of the well‐known poly(ethylene glycol). PGMA allows waterborne treatment of wood, which after polymerization leads to the formation of a wood polymer composite with improved dimensional stability. Microscopic observations and a picture analysis permit the location of PGMA in the wood cell walls and explains the dimensional stabilization by its bulking effect. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 743–749, 2003     

Rheological behavior of concentrated silica suspension and its application to soft armor

The objective of this study is to develop an advanced stab and/or ballistic proof material composed of shear thickening fluid (STF) and Kevlar composite fabric. In this study, we prepared STF using sphere silica and fumed silica as silica particles and ethylene glycol and polyethylene glycol (PEG 200) as medium fluid, respectively. And the rheological properties of the STF were investigated under different conditions. Also, we impregnated Kevlar fabrics with the STF, and investigated the stab and ballistic resistances of the targets layered by the STF impregnated Kevlar fabrics. From the results, we observed that the STF significantly showed the reversible liquid–solid transition at a certain shear rate, and the STF treatment significantly improved the stab and ballistic resistance of Kevlar fabric. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012