酸性化学镀Ni－P合金

介绍了一种稳定性高、沉积速度较快的酸性化学镀Ｎｉ－Ｐ合金工艺．讨论了镀液组成及工艺条件对镀层沉积速度的影响，提出了化学镀Ｎｉ－Ｐ合金的最佳镀液组成和工艺条件．     

酸性化学镀Ni—P合金

介绍了一种稳定性高、沉积速度较快的酸性化学镀Ｎｉ－Ｐ合金工艺，讨论了久液组成及工艺条件对镀层沉积速度的影响，提出了化学镀Ｎｉ－Ｐ合金的最佳镀液组成和工艺条件。     

化学镀Ni－B合金的研究

研究以硼氢化钾为还原剂，乙二胺为络合剂，硫酸亚铊为稳定剂的化学镀Ｎｉ－Ｂ合金镀液的最佳组成和操作工艺。确定了稳定剂的最佳含量。并在此基础上研究了化学镀Ｎｉ－Ｂ合金镀层的结合力、孔隙率、耐烧碱腐蚀性及镀层的硬度与热处理温度的关系等特性。     

化学镀Ni-P合金的热力学及动力学研究

将Ｂｏｃｋｒｉｓ方程应用于化学镀ＮｉＰ合金铁沉积反应当中,通过测定单位时间、单位面积的沉积量,从而求得化学Ｎｉ－Ｐ合金呱应的热力学函数△Ｇθｄｅｐ、△Ｈ＾θｄｅｐ、△Ｓ＾θｄｅｐ。此外,通过各种因素对化学镀Ｎｉ－Ｐ合金沉积速度的影响的试验,分别确定上述诸因素所对应的动力学参数,从而得出了镀液沉积速度的经验方程。     

电沉积Ni—W—B—SiC合镀层初探

利用正交法研究了影响电沉积Ｎｉ－Ｂ－ＳｉＣ复合镀层成分的主要因素,确定了最佳镀液组成的工艺参数;探讨了Ｎｉ－Ｗ－Ｂ－ＳｉＣ复合镀层的组织及结构,结果表明镀液组成对复合镀层的表面形貌影响不大;相反,工艺条件对其影响较大;Ｘ射线衍射表明,当镀层中Ｂ的质量分数为２％时,镀层为晶态结构;当Ｂ的质量分数在２％￣３％时为混晶态;当Ｂ的质量分类大于３％时为非晶态结构。     

低温化学镀Ni-Cu-P三元合金工艺

在以柠檬酸钠为络合剂的化学镀Ｎｉ－Ｃｕ－Ｐ的合金镀液中,添加三乙醇胺辅助络合剂,增加了镀液的稳定性,扩大了施镀范围,可在４０－７０℃下施镀。硫酸镍及次亚磷酸钠的用量,对沉积速度有一定的影响。该工艺可用于黄铜基质材料和低碳钢施镀。     

镀液组成和工艺条件对镀层吸收率的影响研究

探讨了镀液组成和工艺条件对Ｎｉ－Ｍｏ、Ｎｉ－Ｍｏ－Ｐ和Ｎｉ－Ｍｏ－Ｐ－ＳｉＣ镀层吸收率的影响规律,结果表明,采用适当的镀液组成和工艺条件可得到吸 高而发射率低的太阳能吸热镀层,此外,通过适当的热处理可提高镀层的吸收率,而且,镀层具有较高的热稳定性。     

非晶态Ni—P合金镀液和镀层的稳定性

通过对电沉积非晶态Ｎｉ－Ｐ合金镀组成和镀层性能的稳定性进行了研究,了解到对镀层质量影响最大的因素是镀液的ＰＨ值,其次是「Ｈ２ＰＯ３」;找出了稳定镀液组成和镀层质量的有效措施,即采用一定面积比例的ＤＳＡ和Ｎｉ混合阳极,调整好镀液的ＰＨ值,适当加入稳定剂和降低镀液的「Ｃｌ＾－」,定时定量持添加Ｈ３ＰＯ３。     

Al及Al合金化学镀Ni—P工艺及性能研究

研究了铝及铝合金表面化学镀Ｎｉ－Ｐ合金的预处理，镀液配方及镀后热处理。经除油，除洗两道工序处理后，在铝及铝合金表面上直接进行酸性化学镀Ｎｉ－Ｐ合金，镀速最快可达到 ３２．５μｍ／ｈ镀层光亮美现。     

氯化铵体系Zn－Ni合金电镀

研究了镀液成分和工艺参数对镀层Ｎｉ含量的影响，探讨了Ｚｎ－Ｎｉ合金共沉积机理，获得了耐蚀性为同等镀锌层６倍以上的光亮Ｚｎ－Ｎｉ（１３％）合金电镀的配方和工艺条件．     

Ni/纳米Al2O3微粒复合电镀工艺的试验研究

采用复合电镀的方法在45#钢表面制备获得Ni/纳米Al2O3微粒复合镀层.利用正交试验法研究了电流密度、镀液pH值和镀液温度对Ni/纳米Al2O3微粒复合镀层性能和沉积过程的影响.结果发现,它们对镀层沉积过程及其性能都有影响,但影响的程度和规律不同.最后综合考虑各因素,制订出Ni和纳米Al2O3微粒在45#钢表面发生共沉积的较理想工艺.     

XPS study of the corrosion resisting composite alloying layer obtained by double glow plasma with the brush plating Ni interlayer

The Ni-Cr-Mo-Cu multi-element surface alloying with the electric brush plating Ni interlayer on the low carbon steel substrate has been investigated. By the electrochemical method in 3.5% (mass fraction) NaC1 solution, the corrosion resistance of the composite alloying layer and single alloying layer is determined. The experimental results show that the corrosion resistance of the composite alloying layer is obviously better than that of the single alloying layer. The structure and composition of passive films formed on the two kinds of alloyed layers after electrochemical tests in 3.5% NaC1 solution have been studied using X-ray photoelectron spectroscopy (XPS). It is concluded that the double glow plasma surface alloying of low carbon steel with the electric brush plating Ni interlayer is an appropriate technique to enhance the corrosion resistance compared with the single double glow surface alloying.     

Kinetics of electroless Ni-Cu-P deposits on silicon in a basic hypophosphite-type bath

Eleetroless Ni-Cu-P deposits were deposited on the Si substrate in a basic hypophosphite-type plating bath.The effects ofpH value and the metal source composition, Ni and Cu, in the plating bath on the kinetics of the Ni-Cu-P deposition were studied.The electroless Ni-Cu-P deposits were characterized by a scanning electron microscope, a transmission electron microscope, an en-ergy dispersive X-ray spectroscope, and an X-ray diffractometer.The results showed that the pH value of the plating bath had no ob- vious effect on the morphology and composition of electroless Ni-Cu-P deposits.However, the composition of the metal source, Ni and Cu, in the plating bath had great effect on the kinetics of electroless Ni-Cu-P deposition.     

Mechanism and Microstructure of Electroless Ni-Fe-P Plating on CNTs

Electroless Ni-Fe-P alloy plating on the surface of CNTs was carded out with a bath using citrate salt and lactic acid as complex agents. We proposed a chemical reaction mechanism. The morphology, structure and chemical composition of the Ni-Fe-P/CNTs were studied with the aid of a scanning electronic microscope （SEM）, X-ray diffraction （XRD） and an energy-dispersive X-ray spectral analysis （EDS）. The results show that through a correct pre-treatment and electroless plating, Ni-Fe-P/CNTs composite particles can be obtained. The optimum electroless plating parameters of 35-42℃ and pH of 8.5-9.7 were achieved. The as-plated Ni-Fe-P alloy is amorphous. After a heat treatment at 500℃ for 90 min in H2, the coating is transformed into crystalloid Ni3E Fe2NiP and （Fe,Ni）3R The Ni-Fe-P alloy coating on the surface of CNTs is smooth and unique. The amount of Ni on the surface （mass fraction） of the Ni-Fe-P/CNTs composite particles is 29.13%, that of Fe 3.19% and that of P 2.28%.     

The effect and mechanism of Nano-Cu lubricating additives on the electroless deposited Ni-W-P coating

The coating and deposition process with excellent anti wear and suitable for industrial application were developed, and the optimum bath composition and process were obtained by studying the influence of the bath composition, temperature and pH value on the deposition rate and the plating solution stability. Moreover, the tribological properties of nano-Cu lubricating additives and electroless deposited Ni-W-P coating as well as their synergistic effect are researched using ring-block abrasion testing machine and energy dispersive spectrometer. Research results show that Ni-W-P alloy coating and nano-Cu lubricating additive have excellent synergistic effect, e g, the wear resistance of Ni-W-P alloy coating (with heat treatment and the oil with nano-Cu additives) has increased hundreds times than 45 steel as the metal substrate with the basic oil, and zero wear is achieved, which breaks through the bottleneck of previous separate research of the above-mentioned two aspects.     

Preparation of copper-coated fine molybdenum powders with electroless technique

The molybdenum powders with average particle size of 3 μm were coated with copper by electroless plating. The influence of pretreatment,solution composition and plating conditions on electroless copper plating was studied. The copper-coated molybdenum powders were examined by SEM and XRD. Results indicate that a series of optimization methods is used to add activated sites before electroless copper plating. Taking TEA and EDTA as chief and assistant complex agents respectively,2,2’-bipyridyl and PEG as double stabilizers,the Mo powders are coated with copper successfully with little Cu2O contained,at the same time,Mo-Cu composite powders with copper content of 15-85 wt% can be obtained. The optimal values of pH,temperature and HCHO concentration are 12-13,60-65 ℃ and 22-26 mL/L,respectively.     

碳纳米管表面改性工艺参数优化试验研究

利用超声分散法对团聚的原始碳纳米管分散处理后,通过酸化、敏化、活化等步骤对其进行表面改性处理,采用表面化学镀在其表面镀覆镍层,并进行热处理.研究了碳纳米管的分散、表面改性和镀镍工艺对镀层质量的影响.实验结果表明：在乙醇溶液中,利用分散剂进行超声分散可以明显改善碳纳米管之间的团聚状况;经过酸化、敏化、活化处理后其表面可形成密集的活化点;镀镍温度在20℃左右,pH值约8.2时,所得镀层较为均匀,经410℃保温2 h的热处理后,镀层变得光滑、连续、致密,镀层的厚度为12～20 nm.     

纳米晶工业纯铁及其Ni镀层的性能

为了探究基体材料纳米化对镀层性能的影响,采用直流电沉积方法在纳米晶工业纯铁和粗晶工业纯铁上制备了不同厚度的Ni镀层.利用扫描电子显微镜与X射线衍射仪观察并分析了镀层的组织形貌和结构.采用电化学测试和静态浸泡方法对基体和镀层进行了耐腐蚀性能研究.结果表明,纳米晶工业纯铁的基体及其Ni镀层的耐腐蚀性能略优于相同厚度下粗晶工业纯铁的基体及其Ni镀层,但随着镀层厚度的增加,这种差异逐渐减小.同时随着镀层厚度的增加,镀层表面越来越平整致密.