贮氢合金LaNi_（3．8）Co_（0．5）Mn_（0．4）Al_（0．3）表面

贮氢合金ＬａＮｉ_（３．８）Ｃｏ_（０．５）Ｍｎ_（０．４）Ａｌ_（０．３）表面化学镀镍的研究张允什，陈军（南开大学新能源材料化学研究所，天津，３０００７１）关键词贮氢合金，化学镀镍，镍／氢电池目前，稀土系贮氢合金应用于镍／金属氢化物（镍／氢）电池存在的...     

添加剂Ce^4＋对化学镀镍的影响

本文探讨了添加剂Ｃｅ＾４＋对化学镀镍过程的影响，结果表明，Ｃｅ＾４＋可降低Ｎｉ－Ｐ合金镀层在３％ＮａＣｌ溶液中的腐蚀电流，提高其耐蚀性，并发现热处理可使其抗 腐蚀性能进一步提高。但各合金镀层在０．１ｍｏｌ／ＨＣｌ中的耐腐蚀性由于Ｃｅ＾４＋的加入普遍下降。     

化学镀镍—高磷合金的微观结构及晶化行为研究

采用混合络合剂在酸性体系中进行化学镀镍－高磷合金,并用原子力显微镜（AFM）,透射电镜（TEM）、差热分析（DSC）、X射线衍射（XRD）等技术研究所得到的化学镀镍－高磷合金的微观结构和晶化行为。结果表明,化学镀镍－高磷合金具有胞状结构的微观形貌,镀态时呈典型的非晶态结构,300℃以下对热非常。镀层在343．8℃开始晶化,400℃时完全转化成亚稳用Ni5P2,440.4 ℃,时进一步转变成稳定的Ni和Ni3P相其晶化行为同从碱性乙二胺镀液中得到的高磷化学镀镍层有明显的差异。     

缓冲剂对镀镍过程作用机理的研究

缓冲剂对镀镍过程作用机理的研究①高灿柱鹿玉理刘汝涛陈方（山东大学环境工程系济南２５０１００）李树本（中国科学院兰州化学物理研究所兰州７３００００）电镀镍是量大面广的镀种，它作为镀铬、贵金属、仿金、枪黑、黑镍的底层，用途非常广泛［１］．在镀镍过程中，...     

铝表面前处理及化学沉积镍初期行为

利用开路电位-时间(EOCP-t)曲线,研究铝表面经浸镍和化学预镀镍前处理后,化学沉积镍的初期行为;通过扫描电子显微镜(SEM)观察铝表面经前处理后的表面形貌.结果表明:未经及经前处理的铝表面,化学沉积镍的初期行为都经历去氧化膜、活化、混合控制以及化学沉积过程.经过浸镍和化学预镀镍前处理后的铝表面附着细小的镍颗粒.依据EOCP-t和SEM的最佳实验结果,在含有络合剂和还原剂的碱性预镀镍溶液中,经二次化学预镀镍前处理,成功实现铝基底弱酸性化学镀镍.所获得的化学镀镍层与铝基底结合牢固,呈团颗粒状形貌和非晶态结构.     

橡胶表面化学镀镍

橡胶表面化学镀镍;化学镀镍;敏化;活化;橡胶     

低温低内应力化学镀镍工艺的研究

化学镀广泛应用于非金属的电镀、电铸前的施加导电层。化学镀沉积层质量与其在零件上的附着力有着密切的关系 ,重视对化学镀沉积层内应力的研究 ,开发一个低温、低内应力的化学镀镍工艺 ,对于化学镀沉积层的推广应用有着十分重要的意义。本文采用正交实验方法对低温、低内应力化学镀镍工艺进行了系统研究 ,开发出了一个低温、低内应力的化学镀镍工艺。在实验过程中发现沉积层内应力同其在零件上的结合力具有密切关系并对其进行了初步探讨。1　实验方法1 1　正交实验根据探索性实验结果分析 ,影响化学镀镍层内应力σ和沉积层速率ｒ的主要因…     

酸性化学镀镍中次亚磷酸钠阳极氧化行为的研究

采用线性电位扫描和交流阻抗法研究了酸性化学镀镍过程中还原剂次亚磷酸钠的阳极氧化行为。结果表明，次亚磷酸钠的氧化是一个复杂的电化学过程，其阳极氧化行为受本身浓度、溶液温度、阳极扫描速度以及Ｎｉ＾２＋的影响，在其氧化反应之前可能存在异相界面转化步骤，该步骤成为整个氧化过程的控制步骤。     

以硼氢化钠为还原剂化学镀镍的电化学研究

采用线性电位扫描伏安法研究了以硼氢化钠为还原剂的化学镀镍体系, 考查了镀液组成及工艺条件对化学镀镍硼阴、阳极过程的影响, 结果表明: 乙酸镍和硼氢化钠含量的提高分别促进了Ni²⁺的还原反应和BH₄^-的氧化反应; 乙二胺、氢氧化钠以及添加剂硫脲、糖精钠对阴、阳极反应均有不同程度的抑制作用, 同时添加剂中的硫元素加速了镍的氧化; 升高温度有利于阴、阳极反应的进行.     

碳纳米管表面的无钯活化化学镀镍研究

本文提出碳纳米管表面无钯活化的化学镀镍方法.碳纳米管经硝酸氧化和碱中和后表面生成羧基,利用羧基吸附镍离子,之后吸附的镍离子被化学还原为镍的纳米微粒并成为化学镀镍的催化活性中心.红外吸收光谱和电子显微镜观察等证实了上述活化过程的机理.实验表明,新的活化方法对碳纳米管表面化学镀是切实可行的,文中同时对化学沉积层的不同形貌进行讨论.     

化学镀Ni-P合金在CO2溶液中的腐蚀磨损行为

研究了化学镀Ｎｉ－Ｐ合金在ＣＯ２溶液中的腐蚀磨损行为。结果表明,ＣＯ２浓度增大,载荷增加,滑动速度增加,化学镀Ｎｉ－Ｐ合金的腐蚀磨损速率增大、自腐蚀电位负移;ＣＯ２浓度增大,载荷减小,滑动速度降低,化学镀Ｎｉ－Ｐ合金的摩擦系数增大。同样条件下,化学镀Ｎｉ－Ｐ合金比Ｇ１０５钢具有更高的耐腐蚀磨损性。     

Electrochemical deposition of Ni on F-doped SnO<Subscript>2</Subscript> substrate and its post-annealing for use as current collector of dye-sensitized solar cell

Current collector is an important part of nanostructured dye-sensitized solar cells (DSSCs), which reduces ohmic loss. In the present work, Ni current collector was electrochemically deposited on fluorine-doped tin oxide (FTO) for use as current collector of DSSC. The adhesion of Ni to FTO was improved by post-annealing in ambient atmosphere. A new method was proposed to prevent Ni coating from oxidation during annealing. According to this method, a carbon over-layer was applied on Ni coating, which protected Ni from oxidation. Visual inspection and X-ray diffraction (XRD) results showed the effectiveness of this method in protection of Ni coating from oxidation. Furthermore, the effect of current collector on photovoltaic performance of DSSCs was investigated using current density-voltage curve measurement and electrochemical impedance spectroscopy methods. It was observed that post-annealing in ambient atmosphere, under protection of carbon over-layer, improves both the adhesion of Ni current collector to FTO and the photovoltaic performance of DSSC. However, Ni oxidation during post-annealing of Ni current collector, without carbon over-layer, significantly decreased the photovoltaic parameters of DSSC. The above observations were explained by considering the series resistance of DSSC.     

Ni-WC复合电极在弱酸性介质中的析氢催化性能

复合电沉积技术可以用来获得许多具有特殊功能的表层复合材料[1]．其中，用来制各具有电催化活性的表层功能复合材料，引起了人们的极大兴趣[2－4]．对酸性介质中氢的析出反应，金属和合金电催化作用的研究已有不少报导[5－8]，但金属基复合物电催化作用研究的报告，尚不多见．本研究工作米用复合电沉积方法制备WC微粒弥散于Ni中的复合镀层，考察了其在弱酸性介质中析氢反应的电催化性能．1实验制各Ni－WC复合电极的基础镇液组成为NiSO4·6H2O310g·L－1，NiCl2·6H2O50g·L－1，H3BO340g·L-1．所用试剂均为分析纯级，用去离子水…     

Process aspects of electroless deposition for nickel–zinc–phosphorous alloys

Electroless deposition of Ni–Zn–P thin film was considered as a barrier film on a galvanic Zn or Ni–Zn sacrificial layer in a multicomponent corrosion protective coating on steel. The incorporation of zinc on the chemical composition of electroless Ni–Zn–P coating was studied. The effect of operating conditions such as temperature, pH value and concentration of zinc sulphate was investigated. Some physical characteristics such as morphology, structure, corrosion properties of Ni–Zn–P coatings were assessed in parallel with those of Ni–P. Inclusion of Zn to Ni–P is accompanied by the transformation of the coating structure from amorphous to crystalline. The effect of adding nonionic surfactant to the plating solution on the composition and surface morphologies was also investigated. The results indicate that nonionic surfactant has no effect on the Zn % in the deposit layer, but it affects the surface morphology and improves the corrosion resistance of Ni–Zn–P layers. Copyright © 2005 John Wiley & Sons, Ltd.     

稀土对电沉积Ni-P合金镀层耐蚀性的影响

研究了稀土对电沉积Ｎｉ－Ｐ合金度层耐蚀性及组织的影响,通过浸泡实验和极化曲线的测定。得出在镀液中添加一定量的稀土元素能显著改善镀层的耐蚀性能。ＸＲＤ,ＴＥＭ,ＥＤＳ结果表明,稀土元素具有促进Ｎｉ－Ｐ合金形成非晶组织的作用,由于稀土的加入,在远低于８％的Ｐ含量下,获得了以非晶态为主的组织。     

The effect of nonmetallic element P in electroless Ni‐P coating on the passivation process during chemical conversion treatment

Pure Ni and electroless Ni‐P coating (ENPC) were passivated by a chemical conversion treatment. The passive films formed on pure Ni and ENPCs (with content of P 2.9, 7.2 and 11.7 at.% respectively) were analyzed by X‐ray photoelectron spectroscopy (XPS). High‐resolution XPS was also used to analyze the chemical states of the elements detected in the passive films. The results indicated that the detected Ni and P were in elemental states, and no compound with Ni and P element was detected in passive film, meaning that Ni and P did not participate in the formation of the passive film. The content of film‐forming reaction product in passive film increases with the content of element P in Ni‐P coating, suggesting that the nonmetallic P in Ni‐P coating played an important role in the formation of the passive film. The XPS results were used to analyze the formation mechanism of the passive film. Copyright © 2014 John Wiley & Sons, Ltd.     

化学镀镍磷合金镀层孔隙率的电化学评价

本文通过研究镍磷合金、镍磷合金镀层和碳钢在不同浓度硝酸溶液中的动电位极化曲线 ,选择了能够快速检测镍磷合金镀层孔隙率的硝酸浓度 ,并对不同厚度的镍磷合金镀层试样进行评价 .结果表明 :镍磷合金镀层在 1 0 %硝酸溶液中的动电位极化曲线能准确地反映镀层的孔隙率 ,该硝酸溶液最适合作为应用电化学方法检测镀层孔隙率的检测溶液 ,其变化规律是随着镀层孔隙率的减少 ,镀层的腐蚀电位逐渐正移 .应用常规的孔隙率检测方法只能检测较大的孔隙 .     

Microstructural characteristics of Ce conversion coatings on Cf/Al composite or Ni?P plated Cf/Al composite

The microstructural characteristics of Ce conversion coatings on carbon fiber reinforced Al matrix (Cf/Al) composites and Ce conversion coatings on Ni? P plated Cf/Al composites were studied by SEM, AFM, TEM and XPS. The Ce conversion coating on the Ni? P plated composite does not have obvious microcracks, which can be found easily in Ce conversion coatings. The Ce conversion coating on Ni? P plated composite has a lower surface roughness profile arithmetic mean deviation (R_a) than Ce conversion coating, as seen by AFM. Because of the inhomogeneity of the material surface and the different levels of deposition of Ce conversion coatings at the different sites, nonhomogeneous sites would promote microcrack formation of the Ce conversion coatings. The Cf/Al composite surface has lessuniformity than Ni? P plated composite, leading to more prominent microcracks. Selected area electron diffraction (SAED) patterns of Ce conversion coating could not be indexed nor matched closely to any of the oxides (Ce₂O₃, Ce₇O₁₂, Ce₆O₁₁) or hydroxides (Ce(OH)₃) that are listed in the Powder Diffraction File maintained by Diffraction Data, but for Ce conversion coating on the Ni? P plated composite the data matched closely with that of CeO₂ or Ce₆O₁₁. The XPS results showed that the Ce conversion coating mainly contained both Ce³⁺ and Ce⁴⁺ species, but Ce⁴⁺ species were the dominant oxidation state on Ni? P coating with Ce conversion deposition. Copyright © 2008 John Wiley & Sons, Ltd.     

Sol-enhanced triple-layered Ni–P–TiO2 composite coatings

A novel coating process, TiO₂ sol enhanced Ni–P electroless composite coatings on carbon steel, is presented in this paper. Transparent TiO₂ sol was added into the electroless plating Ni–P solution at a controlled rate, leading to in situ synthesis of a triple-layered Ni–P–TiO₂ composite coating, i.e. the inner, transition and outer layers. The inner layer has a thickness of ~3 μm, mainly composed of Ni and P elements. The transition layer of the coating has a relatively high content of TiO₂ with a thickness of ~500 nm and a columnar-structure. The thickness of the outer layer was ~7 μm, with almost evenly distributed Ni, P and TiO₂. The hardness and Young’s modulus of the composite coating were greatly improved to ~10 and ~200 GPa, respectively, compared to ~6 and ~110 GPa of the traditional Ni–P coating.     

Electrocatalytic Properties of Electrolytic Ni/Ru and Fe/Ru in the Methanol Oxidation

Electrocatalytic activity of electrolytic alloys Ni/Ru and Fe/Ru in anodic oxidation of methanol in alkaline solutions is higher than that of Ni and Ru and rises with the Ru content increasing to 80% and with the coating weight.