硫酸盐电镀锌铁合金的阳极选择

研究了酸性硫酸盐电镀锌铁体系中不溶性阳极,可溶性阳极对镀液中Zn2 、Fe2 浓度的影响及镀层中成分的影响.采用锌、铁、石墨作联合阳极,其面积比为S锌:S铁:S石墨=1.5:1:1时,镀液中Zn2 、Fe2 浓度基本保持一致,镀层合金的成分变化较小.此外,镀液中Zn2 浓度的微量变化,对镀层中的成分影响不大.     

温度对酸性液电镀Zn-Ni合金质量的影响

利用能谱仪和扫描电镜研究了温度对酸性液电镀Zn-Ni合金镀层成分、形貌的影响,研究了30℃时得到的合金镀层在w(NaCl)=5%溶液中的耐腐蚀性能.结果表明,温度为30℃时,镀层中镍含量达到12.91%;镀层颗粒均匀细小,无明显脱落起皮现象,质量最好;在w(NaCl)=5%溶液中有良好的耐蚀性.     

装饰性Zn-Ni/Ni-P镀层的研究

为进一步提高镀层的耐蚀性、降低脆性,在含有缩合物添加剂的镀液中制备了结晶为14～33nm的Zn-Ni合金镀层.采用SEM、XRD对镀层的微观形貌及相组成进行了研究.将此Zn-Ni合金镀层作为底层,制备了双层Zn-Ni/Ni-P镀层,结果表明:双层镀层的耐蚀性比装饰铬组合镀层提高1倍以上,而且镀层的氢脆大大降低,尤其适合于高强度零件的电镀.     

光亮碱性Zn-Al合金电镀工艺研究

在碱性锌酸盐镀锌液中加入铝盐，研究成功了一种光亮碱性锌铝合金电镀工艺。采用霍尔槽试验探讨了镀液成分和工艺条件对镀层质量的影响，检测了镀液和镀层性能。研究结果表明：镀液阴极电流效率达到80%以上，镀液分散能力和复盖能力好，镀层中铝含量为1．5％左右，所形成的Zn-Al合金镀层结晶细致、光亮度好、结合力好、耐蚀性优良，适用于作高耐蚀性镀层。     

前处理对镁合金化学镀镍结合力的影响

研究了镁合金多种前处理工艺对化学镀镍层与基体之间结合力的影响.采用弯曲法、锉刀实验法和划线划格实验3种镀层结合力测试方法,对化学镀镍层与镁合金基体之间结合力的优劣进行了定性评价.结果表明,采用一步法前处理工艺的试样,镀层与基体之间具有良好的结合力,金相显微观察发现镀层与基体之间具有最薄的中间过渡层.用浸锌工艺能较好地改善镀层与基体间的结合力.但镁合金浸锌工艺值得做进一步的研究.     

稀土对机械镀无结晶形成过程及镀层性能的影响

采用机械镀方法制备了锌基稀土无结晶镀层,用扫描电子显微镜(SEM)、X射线荧光光谱分析(XRF)等研究了稀土添加对机械镀无结晶镀层形成过程及镀层特性的影响.结果表明,稀土金属盐复合添加剂能影响无结晶镀层形成时金属微粉的集聚、吸附和沉积特性,使金属粉趋于面状吸附一沉积,改善了镀层的形成条件.机械镀锌基稀土合金镀层外观平整、光亮,密度、显微硬度、耐腐蚀性和电化学特性明显优于传统机械镀锌层.     

镍对热镀锌耐蚀性的影响

对Q235和Q345两种材料表面热浸镀纯Zn和Zn－Ni合金，研究Ni对热镀锌耐蚀性的影响。采用中性盐雾试验对镀层耐蚀性测试，将纯Zn镀层和Zn-Ni合金镀层进行对比，并用电子天平称量试样重量变化。结果表明Zn－Ni合金镀层比纯Zn镀层更耐腐蚀。     

连续电镀锌-镍合金技术的研究

提出了连续电镀锌镍合金的高氯化氨-弱酸型镀液工艺参数,对镀液成分、pH值、温度、阴极电流密度对镀层镍含量的影响及连续电镀锌镍合金的镀速控制等问题进行了研究.得到外观良好、镍含量在13%～15%的锌镍合金镀层.     

锌铝镁镀层钢板的研究进展

介绍了近年来锌铝镁镀层钢板的发展情况,综述了其镀层结构特点及性能的研究进展,探讨了锌铝镁镀层钢板的应用前景.锌铝镁镀层钢板具有相似的镀层结构,其表面具有纳米特征.锌铝镁镀层钢板的耐蚀性是镀锌钢板的4倍,且具有自愈性,优良的耐膜下腐蚀性、成形性和焊接性能,是一种新型长寿命、能源资源节约型钢铁材料.     

氯化物电镀Zn—P合金的研究

研究了Ｚｎ－Ｐ合金电镀液组成及工艺条件对镀层含磷量的影响，在最佳工艺参数条件下，可得到磷的质量分数为０．１％左右的Ｚｎ－Ｐ合金镀层。对镀液、镀层性能进行了测试，实验证明经银白色钝化后的Ｚｎ－Ｐ合金镀层的耐蚀性能是纯锌镀层的２倍以上。     

电沉积法制备泡沫Ni-Mo-Co合金

本文以聚氨酯泡沫海绵为基体,经导电层的制备、电镀和热解还原工艺制备出了泡沫Ni-Mo-Co三元合金.采用扫描电子显微镜(SEM)和X射线衍射技术(XRD)分别研究了化学镀镍后及电镀Ni-Mo-Co合金的表面形貌、元素组成和晶态结构,并用稳态极化曲线研究了泡沫Ni-Mo-Co合金电极在30%KOH溶液中的析氢催化性能.结...     

The Electrolytic Preparation and Characterization of Ni-Fe Alloys

The electrodeposition of nickel rich Ni-Fe alloys from an alkaline (pH 8.5) bath containing serine and sodium pyrophosphate has been studied. The functional properties (hardness, coercivity and corrosion resistance) and their dependence on plating variables (bath composition and working conditions) are discussed. The deposited alloy under optimum plating conditions is fine grained with fcc structure. The composition of the alloy varied with cd, pH and composition of the bath solution. The solution affords 90% current efficiency and 35% throwing power under some experimental conditions. The anomalous co-deposition of Ni-Fe alloy is minimized considerably by the presence of complexing agents in the solution. Spectral studies (UV-Visible) indicated the presence of Ni^2- ions in the complex state in preference to Fe^2- ions.     

Mathematical modeling of electrodeposition of permalloy thin film I. direct current plating

A mathematical model is presented to describe the electrodeposition of Ni-Fe alloy film on a rotating disk electrode in chloride solution. The model incorporated with anomalous codeposition phenomena agrees well with the experimental data under a variety of conditions. The Fe content in permalloy shows a maximum at current densities between 2 mA/cm² and 5 mA/cm², then decreases monotonically as a function of the applied current density. Also experimental and simulated results are discussed in terms of solution pH, rotating disk speed, and iron concentration which affects the Fe content in the permalloy during electrodeposition.     

电沉积电位对锌镍合金镀层耐蚀性的影响

采用电化学沉积方法在DH36船板钢表面制备了锌镍合金镀层。采用扫描电镜(SEM),能谱仪(EDS)和X射线衍射仪(XRD)等研究了电化学沉积电位对锌镍合金镀层形貌、化学成分和晶体结构的影响。结果表明:随着沉积电位的升高,锌镍合金镀层由无法覆盖整个基底表面到均匀致密覆盖,再到较大微纳米颗粒层覆盖,证明沉积速率越来越大。由EDS和XRD分析可知,在较低电位下沉积,锌镍电沉积过程属于正常共沉积,而在较高电位沉积时,锌镍电沉积过程属于异常共沉积。电化学极化曲线测试表明,在电沉积电位为-1.2 V时所获得的锌镍合金镀层的耐腐蚀性最好。     

直流与脉冲电沉积Ni-Cr合金镀层的结构及耐蚀性

用直流电沉积(DC)、脉冲电沉积(PC)技术在低碳钢表面制备Ni-Cr合金镀层,采用X射线衍射(XRD)、扫描电镜(SEM)、原子力显微镜(AFM)等方法,研究了电沉积方式对合金镀层晶粒结构和表面形貌的影响;用浸泡法和电化学极化法测试了合金镀层在3.5%(质量分数)Na Cl溶液中的耐蚀性。结果表明,电沉积方式对镀层结构和性能有较大影响:PC方式得到的合金镀层,其纳米晶尺寸更小(由45 nm减小为26 nm),镀层表面致密性更高;表现在性能上,与DC相比,PC合金镀层的显微硬度更大(由7000 MPa增加到8250 MPa),耐蚀性更好(自腐蚀电位由–0.624V正移到–0.477 V,腐蚀电流密度由1.911×10~(-4)A/cm~2减小到2.587×10~(-5) A/cm~2)。     

镍硫钴析氢电极的制备及性能研究

采用电沉积方法制备Ni-S-Co合金电极,通过正交实验和极化曲线测试研究了CoSO4·7H2O浓度、电流密度、电镀液温度、电沉积时间和电解液温度对Ni-S-Co电极析氢性能的影响.采用SEM,XRD和EDXA对镀层的形貌、结构和组成进行观察和分析.实验结果表明:制备具有最佳析氢活性的Ni-S-Co电极的工艺条件是25 ...     

Electrochemical Properties of Pulse Plating Amorphous Ni-Mo-W Alloy Coating in Alkaline Medium

采用脉冲电镀技术获得了高活性Ni-Mo-W析氢合金阴极。以析氢反应过电位为考察指标,确定了脉冲镀Ni-Mo-W合金的最佳电镀条件,如Na2WO4·2H2O浓度、平均电流密度和占空比等。同时,系统研究了Mo和W含量对Ni-Mo-W合金镀层成分和组成的影响规律。结果表明,在二元合金中添加W能有效提高电极的析氢反应活性(η200＝80 mV);非晶态Ni-Mo-W合金的组织结构主要取决于Mo含量;与非晶态Ni-Mo合金镀层相比,Ni-Mo-W合金析氢阴极的电化学稳定性得到一定程度的提高。     

Preparation of thin film resistors with low resistivity and low TCR by heat treatment of multilayered Cu/Ni deposits

Thin Cu–Ni alloy film resistors were prepared by different methods using both electroless plating and electrodeposition. Alloy composition, structure and electrical properties (resistivity and TCR) were examined as a function of plating conditions. Low resistivity and low TCR performance were achieved by heating the multilayered Cu/Ni film deposited on electroless Cu.     

The Kinetics of Electrode Reactions III Practical Aspects

Abstract

To study the electrodeposition of Cr–Co alloy, as a possible alternative to the deposition of pure Cr, in particular from hexavalent Cr baths, Cr(III) formate–urea electrolyte containing various concentrations of CoCl₂ was used. The deposition rate, composition, phase state and structure of Cr–Co deposits were investigated. The data obtained suggest that the electrodeposition of Cr–Co alloy occurs under acceleration of Cr(III) and inhibition of Co(II) ions electroreductions. It was found that the presence of 1–2 g L^–1 CoCl₂ in Cr(III) bath has an optimum effect on the electrodeposition of the good quality thick (30 μm) Cr–Co alloy obtained. The X-ray diffraction data reveal that the Cr–Co alloy deposit has an X-ray amorphous structure with a grain size of ～1·3 nm. The morphology of the deposit shows a significant dependence of the nodular structure on the percentage of Co. X-ray photoemission spectroscopic spectra indicate the presence of oxide and metal phases for both metals in the top layers of as deposited Cr–Co alloy.     

电沉积铁镍合金薄膜及其结构与磁性能的研究

采用电沉积工艺制备了不同成分的铁镍合金镀层,分析了镀层的微观形貌及组织结构,并测量了电沉积样品的磁化曲线和磁滞回线。研究结果表明:通过电沉积工艺可得到晶体结构的铁镍合金层,不同成分的铁镍合金层织构取向有所不同;镀层的磁性能随镍含量的变化而变化,在开路测量条件下的最大磁导率高于冷轧态1J85合金。