电沉积复合镀层的研究动态与应用

综述了电沉积法制备自润滑复合镀层、电接触功能复合镀层、电催化复合镀层等的研究动态.结果表明,随着科学技术的发展,传统的单金属镀层已很难满足某种特殊需求,而复合电沉积法具有控制简单、易于操作、投资少等优点,今后将会得到广泛应用.     

电沉积多元复合镀层的研究现状

综述了近几年来国内外在复合电沉积制备多元复合材料方面的进展。重点探讨了麻复合镀层、自润滑复合镀层、电接触功能的复合镀层、耐蚀复合镀层等的研究现状和发展趋势。结果显示,随着现代科学技术的快速发展,单金属复合镀层 难于满足某些需求,而多元复合镀层由于具有耐磨、耐蚀或耐磨、耐高温氧化等优点,在今后的发展中将得到更广泛的应用。     

无机颗粒的共沉积机理

一概述所谓复合电沉积是指用电沉积的方法,使金属与无机颗粒、有机颗粒或金属颗粒共同沉积,以形成复合镀层的方法,运用复合电镀,可以获得许多具有特殊功能的复合镀层,诸如耐磨镀层、耐高温镀层、减摩镀层、耐磨自润滑镀层、高温耐磨镀层、高温自润滑镀层、耐腐蚀镀层、分散强化镀层、特殊装饰性彩色镀层等等,它们在机械工业、航空工业、汽车工业,以及电子工业与航天工业中有着被广泛使用的前景,可以胜任单金属镀层与合金镀层无法胜任的场合。因此,我们可以毫不夸张地说,     

纳米材料在复合电沉积中的应用

综述了纳米复合镀层(包括高硬度耐磨纳米复合镀层,耐腐蚀、装饰性复合镀层,耐高温氧化复合镀层和具有电接触功能的纳米复合镀层等)的研究现状。对纳米微粒与金属的共沉积机理———吸附机理、力学机理和电化学机理以及纳米复合镀层的结构特点进行了概述。指出了纳米复合电沉积技术存在的问题及今后的发展方向。     

电沉积铜基自润滑复合材料的研究进展

从4个方面综述了复合电沉积工艺制备铜基自润滑材料的研究进展,包括固体润滑剂、复合电沉积工艺、摩擦性能和复合电沉积机理。常用的固体润滑剂主要有石墨、MoS2、WS2,、PFFE等。影响复合材料性能的主要因素有电流密度、微粒浓度、搅拌程度等。关于微粒和金属共沉积的内在规律存在不同的理论模型,主要有Guhlielmi模型、MTM模型、Valdes模型、运动轨迹模型和并联吸附模型。简单介绍了纳米复合镀层和复合电铸的发展概况与趋势。提出阴极和颗粒接触局部区域的细节将成为复合电沉积机理的研究重点。     

国内复合镀层最新进展及应用

综述了我国近年来复合镀技术的进展及应用现状,包括耐磨耐蚀复合镀层、自润滑复合镀层、具有电接触功能的复合镀层及分散强化复合镀层等。并指出了复合镀技术在应用方面所面临的问题及其改进措施。     

我国复合镀层最新进展及应用

综述了我国近年来复合镀技术的进展及应用现状，包括耐磨耐蚀复合镀层，自润滑复合镀层，具有电接触功能的复合镀层及分散强化复合镀层等。并指出了复合镀技术在应用方面所面临的问题及其改进措施。     

镍基自润滑复合镀层的研究进展

复合镀层由于具有优异的耐磨性、耐蚀性、自润滑等性能而受到广泛关注.采用电沉积或化学镀可以获得复合镀层,复合电镀也是制备复合材料的一种重要方法.本文主要对近几年国内外在镍基自润滑复合镀层方面取得的研究成果进行了概述.     

电沉积La—Mo—ZrO2及其性能的研究

通过复合电沉积制备La-Mo-ZrO2/Ti电极,测试表明:La-Mo-ZrO2镀层结合力强,硬度高,耐蚀和耐热性能优良.阴极极化曲线表明:以钛基电沉积La-Mo-ZrO2复合镀层作为阴极,在质量浓度为300 g/L的NaCl溶液中,60℃,Jk=30mA/cm2电解,能降低氢超电势605 mV.结果表明:以钛基电沉积La-Mo-ZrO2复合镀层是优良的析氢电催化电极,电催化性能的增加完全归因于电极比袁面的增加.     

复合电沉积研究的新动向

复合电沉积是获得功能性复合材料镀层的一种新工艺。综述了近年来国内外在复合电沉积研究方面的新动向。重点探讨了多元复合电沉积、纳米复合电沉积、功能梯度材料复合电沉积的研究现状和发展趋势。这三类复合镀层在耐磨性、抗腐蚀性和抗高温氧化性等方面比传统的复合镀层更优越。展望了今后复合电沉积的研究和应用前景。     

锡基复合镀层材料制备工艺的研究

探讨了应用于锌-镍电池负极集流体的锡基复合电镀工艺。通过SEM表征了材料的形貌,并将锡基复合镀层材料与普通光滑平面锡基材料进行物理性能及镀层致密性对比分析。结果表明:在相同工艺条件下,锡基复合镀层材料各项性能更加优异,更适用于高容量电池的制作。     

电沉积Cu-Sn-Zn-PTFE复合镀层及其性能的研究

针对Cu-Sn-Zn合金镀层自润滑性能差的缺点,在Cu-Sn-Zn合金镀液中加入聚四氟乙烯(PTFE)乳液,采用电沉积方法在45#钢表面制备了Cu-Sn-Zn-PTFE复合镀层。镀液组成和工艺条件为:焦磷酸铜24g/L,氯化锌12g/L,甲基磺酸锡15g/L,焦磷酸钾20g/L,酒石酸钾钠22g/L,全氟辛基磺酸钾18g/L,PTFE乳液32g/L,温度50~60℃,pH值11.5,电流密度1.2A/dm~2,搅拌转速300~600r/min,时间120min。考察了镀液中PTFE的质量浓度对镀层的耐磨性、显微硬度、结合力、PTFE的质量分数、外观的影响,并表征了Cu-Sn-Zn-PTFE复合镀层的表面形貌、结构和成分。随着镀液中PTFE的质量浓度的增加,镀层的耐磨性改善,显微硬度和结合力下降,PTFE的质量分数先增大然后保持不变。镀液中PTFE的最佳质量浓度为32g/L,在此条件下制得的Cu-Sn-Zn-PTFE复合镀层的综合性能最佳。     

Electrodeposition and tribocorrosion behaviour of ZrO<Subscript>2</Subscript>–Ni composite coatings

With the objective of producing new functional surfaces with enhanced tribo-corrosion properties we have investigated the electrochemical codeposition of composites in which an electrodeposited metal (nickel) is the matrix and a transition metal oxide (ZrO₂) is the dispersed phase. This paper describes the effect of ZrO₂ dispersed particle codeposition on nickel electrocrystallisation steps as well as the tribocorrosion behaviour of the composite coatings obtained. This system was selected because nickel is an industrially important coating material on steel and other support materials. The cathodic polarization curves have been plotted both in the presence and absence of the insoluble dispersed phase. Electrochemical impedance spectroscopy was used to obtain additional information on the early steps of nickel and nickel matrix composite electrodeposition. Impedance data were acquired with a Solartron type electrochemical interface and frequency response analyzer. A schematic codeposition mechanism is proposed. The influence of zirconium oxide on the nickel electrodeposition steps is discussed. The tribocorrosion properties of ZrO₂–Ni composite coatings (100 μm thickness) have been studied in 0.5 M K₂SO₄ solution on a pin on disc tribo-corrosimeter connected to an electrochemical cell. The normal force applied was 10 N at a rotation speed of 120 rpm. The counterbody (pin) was a corrundum cylinder (7 mm in diameter), mounted vertically on a rotating head, above the specimen. The lower spherical end (radius = 100 mm) of the pin was then applied against the composite surface (disc).     

电沉积碳纳米管担载金属纳米微粒复合镀层及其应用

碳纳米管因其具有独特的性能而受到越来越多的关注,其固有的特性使其成为理想的金属纳米微粒的载体。概述了电沉积法制备碳纳米管担载金属纳米微粒的工艺及其进展,同时介绍了该复合镀层在催化剂和传感器等领域的应用。     

锂离子电池高镍三元材料的包覆改性研究进展

锂离子电池高镍三元材料具有循环寿命长、绿色环保、成本低等优点,已成为电动汽车、便携式电子设备等领域的首选正极材料。但是,镍含量的增加容易使材料表面结构不稳定、界面副反应增加,导致材料的循环性能降低。主要从单层包覆和双层包覆两个方面综述了高镍三元材料的改性研究,介绍了不同包覆材料对其电化学性能的影响。双层包覆能更好地改进高镍三元材料的电化学性能,但是在清除氟化氢方面仍需进行研究。     

Electro-deposition and characterizations of nickel coatings on the carbon–polythene composite

Nickel coating on the carbon–polythene composite plate was prepared by electrodeposition in a nickel sulfate solution in this work. The morphology and cross-sectional microstructure of the nickel coating were examined by scanning electron microscope (SEM) and optical microscope (OM), respectively. The influence of bath temperature on the nickel deposition rate was investigated experimentally. The adhesion between the coating and the substrate was evaluated by the pull-off test. The corrosion behavior of the coating in an aqueous solution of NaCl was studied by electrochemical methods. The results showed that the nickel electrodeposition rate could reach up to 0.68 μm min⁻¹ on average under conditions of cathodic current density of 20 mA cm⁻² and bath temperature of 60 °C. It was confirmed that increasing the bath temperature up to 50 °C had a positive effect on the nickel deposit rate, while an adverse effect was observed beyond 60 °C. The adhesion strength between the nickel coating and the substrate can be more than 2.3 MPa. The corrosion potential of the bright coating in the NaCl solution was more positive than that of the dull coating, and the anodic dissolution rate of the bright coating was also far lower at the same polarization potential compared with the dull coating.     

The electrochemical corrosion behavior of sealed Ni–TiO2 composite coating for sintered NdFeB magnet

In this article, a protective sealed Ni–TiO₂ composite coating (SCC) was prepared on sintered NdFeB magnet by pulse current electrodeposition and sol–gel combined technique. For a comparison, unsealed Ni–TiO₂ composite coating (UCC) was also studied. The surface morphologies of composite coating were studied using scanning electron microscope (SEM). The structure of sealing layer was studied by Fourier transform infrared (FT-IR) spectrum. The anticorrosive properties of composite coating in neutral 3.5 wt% NaCl solution were evaluated by potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS). In order to further investigate the anticorrosive properties of SCC, a long-term immersion test was carried out in neutral 3.5 wt% NaCl solution. The results of corrosion tests showed that due to the blocking effect of sealing layer, SCC can suppress the corrosion process by holding back the transfer or diffusion of corrosive medium, and therefore showed the excellent anticorrosive properties for sintered NdFeB magnet.     

近年来辐射固化材料的研究进展

综述了光化学、光自由基聚合、光引发剂UV固化、UV固化剂、电沉积光敏抗蚀剂和涂料、UV水基和粉末涂料及UV固化纳米复合材料的研究进展。     

Ni-SiO2纳米微粒复合镀层的电沉积及其耐蚀性研究

采用控电流电沉积技术以铜为基体制备了Ni-SiO2纳米微粒复合镀层.通过改变镀液中SiO2纳米微粒的质量浓度,考察了其对镀层中SiO2微粒的质量分数、电沉积速率及镀层耐蚀性能的影响,对纯镍镀层与Ni-SiO2纳米微粒复合镀层的耐蚀性进行了比较.研究了阴极电流密度对复合镀层耐蚀性能的影响,并采用扫描电子显微镜对镀层形貌进...