复合电镀的研究新进展

综述了近年来国内外在复合电镀研究方面的进展。重点探讨了多元复合电沉积、纳米复合电沉积、含稀土复合电沉积、功能梯度材料的复合电沉积的研究现状和发展趋势。资料表明：复合材料镀层的耐磨、耐蚀、抗高温氧化等性能优于单金属镀层或合金镀层。复合镀层在今后的发展中将有更广阔的应用前景。     

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。     

电沉积纳米复合镀层的研究现状

纳米复合电沉积是一种新兴的复合表面技术。阐述了纳米颗粒与金属共沉积的机理、工艺条件对纳米复合电沉积的影响。以及纳米复合共沉积的应用。纳米与金属共沉积可明显提高镀层的硬度、耐磨、耐蚀、光催化和电接触性能。指出了纳米复合电沉积现存的问题，并为今后的研究提出了建议。     

电沉积耐磨复合镀层的研究与进展

综述了电沉积耐磨复合镀层的研究与进展,重点介绍了电沉积耐磨复合镀层的制备工艺、性能及其应用等.指出了目前所存在的问题,并对今后的研究提出了建议.     

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。     

Ni—P—W—SiC复合镀层的研制

前言晶化处理因提高 Ni—P 耐蚀镀层的显微硬度值。可明显改善镀层的耐磨性;外加硬质相又进一步提高了这类复合镀层的耐磨性.400℃真空处理后,这类复合化学镀层的耐磨试验结果表明(图一)。SiC 硬质颗粒对改善复合镀层耐磨性的效果最佳.复合镀层具有优良的使用性能和较明显的经济效益,是当前涂层技术发展的一个重要前沿.本文叙述了 Ni—P—W—SiC 复合电镀层的研制、质量和部分性能测试结果.     

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...     

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,     

复合电沉积Ni-W-P-CeO_2-Al_2O_3镀层耐蚀性能的研究

采用复合脉冲电沉积法制备Ni-W-P-CeO2-Al2O3复合镀层,研究了该镀层耐蚀性能。实验结果表明：镀层的耐蚀性随着制备温度的升高而明显得到提高,同时随着电流密度的增大,镀层的腐蚀速率降低,耐蚀性能得到提高,升高到一定的程度后,耐蚀性反而降低。随着电沉积时间的延长,镀层的耐蚀性能明显提高,但时间延长到一定程度后,耐蚀性变化不明显。经热处理后,Ni-W-P-CeO2-Al2O3复合镀层耐蚀性均有所提高。     

弹簧件常温复合发蓝工艺研究

传统的常温发蓝工艺存在着附着力和耐磨性差的缺点，研究了一种用于弹簧件的常温复合发蓝工艺，介绍了前处理，发蓝及后处理工序，测量了发蓝膜的附着力，耐磨和耐蚀性，并与传统常温发蓝进行了对比。复合发蓝膜的附着力，耐磨和耐蚀性明显优于传统常温发蓝膜。这是由于复合发蓝膜的孔隙中生成的磷化膜的作用导致的。     

化学复合镀(Ni-W-P)-Si3N4工艺研究

采用化学复合镀方法,制备了(Ni—W—P)—Si3N4复合镀层;研究了镀液组成及工艺参数对镀层成分和沉积速率的影响;采用X—射线衍射分析了复合镀层表面相结构,并对复合镀层的耐蚀性及耐磨性进行了测试分析。试验结果表明：Si3N4纳米颗粒的加入影响了镀层的沉积速率,提高了沉积层的耐磨性;(Ni—W—P)—Si3N4复合沉积层仍具有与Ni—W—P沉积层相近的优异性能。     

纳米二氧化钛在镍基合金复合镀中的应用

概述了纳米TiO2颗粒在制备耐腐蚀、高硬度、高耐磨等功能的复合镀层领域的应用情况.加入纳米TiO2后,复合镀层的耐蚀性、硬度和耐磨性更好.     

Corrosion resistance properties of electroless nickel composite coatings

Electroless nickel (EN) composite coatings incorporated with PTFE and/or SiC particles demonstrated significantly improved mechanical and tribological properties as well as low surface energy which are desired for anti-sticking and wear resistant applications. The corrosion resistance of these composite coatings, however, has not been systematically studied and compared. This work aimed to investigate the corrosion characteristics of EN composite coatings using electrochemical measurements which include open circuit potential (OCP), electrochemical impedance spectroscopy and potentiodynamic test. The effects of the co-deposited particles on corrosion behavior of the coatings in 1.0 N H₂SO₄ and 3% NaCl media were investigated. The surface autocatalytic properties and the post-heat-treatment on coating corrosion resistance were also discussed. The results showed that both EN and EN composite coatings demonstrated significant improvement of corrosion resistance in both acidic and salty atmosphere. Ni striking substantially enhanced the corrosion resistance due to the improvement of the surface autocatalytic properties and homogeneity. Proper post-heat-treatment significantly improves the coating density and structure, giving rise to enhanced corrosion resistance.     

化学镀制备高耐蚀耐磨Ni-P-SiC复合镀层

研究了Ni-P-SiC复合镀层的制备工艺和性能以及SiC含量对镀层性能的影响。采用Taber试验机对Ni-P-SiC复合镀层的磨损性能进行了测试,并用VHX-100型三维视频显微镜对磨损形貌进行了观察,分析了复合镀层的磨损机理。结果表明:SiC颗粒的加入能有效地降低摩擦副之间的犁沟效应及摩擦表面发生粘着的面积,从而减少镀层的磨损。采用电化学实验等手段研究了Ni-P-SiC复合镀层的耐蚀性能。当复合镀层均匀一致,能起到一个良好的屏蔽作用时,耐蚀性十分优异;而镀层缺陷的存在将导致耐蚀性能降低。     

Effects of carbon nanotube content on adhesion strength and wear and corrosion resistance of epoxy composite coatings on AA2024-T3

The effects of multiwalled carbon nanotube (MWCNT) content on the adhesion strength and wear and corrosion resistance of the epoxy composite coatings prepared on aluminum alloy (AA) 2024-T3 substrates were evaluated using atomic force microscopy (AFM), blister test, ball-on-disk micro-tribological test and electrochemical impedance spectroscopy (EIS). The adhesion strength of the epoxy composite coatings improved with increasing MWCNT content. Increased MWCNT content also decreased the friction coefficient and increased the wear resistance of the epoxy composite coatings due to improved solid lubricating and rolling effects of the MWCNTs and the improved load bearing capacity of the composite coatings. Finally, EIS indicated that increased MWCNT content increased the coating pore resistance due to a decreased porosity density, which resulted in an increase in the total impedance of the coated samples.     

Corrosion- and wear-resistant properties of Ni–Al<Subscript>2</Subscript>O<Subscript>3</Subscript> composite coatings containing various forms of alumina

This article describes the effect of the addition of different phases of alumina particles on the properties of electrodeposited Ni–Al₂O₃ composite coatings. The corrosion- and wear-resistant properties of Ni–Al₂O₃ composite coatings electrodeposited from a nickel sulfamate bath containing (i) alpha-alumina particles (Ni–Al₂O₃-1), (ii) gamma-alumina particles (Ni–Al₂O₃-2), and (iii) mixture of alpha, gamma, and delta alumina particles (Ni–Al₂O₃-3) have been studied. The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) studies showed superior corrosion resistance of Ni–Al₂O₃-2 composite coatings compared with other two coatings. The SEM images and EDAX spectra also corroborated well with the observed corrosion results. The pin-on-disk wear studies showed improved wear resistance of Ni–Al₂O₃-1 composite coating containing alpha alumina compared with other two coatings. The transfer of material from the pin onto the disk was evident from the optical microscopy images of the wear tracks and Raman spectra of the wear track. This study shows that the addition of pure gamma-alumina particles enhances the corrosion resistance, and that pure alpha-alumina particles enhance the wear resistance of Ni composite coatings to a greater extent.     

纳米微粒复合镀层的研究进展

介绍了纳米微粒复合镀层的制备方法。综述了高显微硬度复合镀层、耐磨性复合镀层、耐蚀性复合镀层以及其它特殊功能复合镀层的发展现状及应用前景,总结了目前纳米微粒复合镀技术存在的问题,并且就其以后的研究发展进行了展望。     

Studies on electroless Ni-P-Cr_2O_3 and Ni-P-SiO_2 composite coatings

本文对化学镀镍及化学镀镍磷基质中SiO2与Cr2O3的共沉积进行了研究。微粒在不断生长的膜层中共沉积引起了新的化学复合镀层的出现,这些复合镀层许多都具有优异的耐磨及耐蚀性能。通过选取镀层合金/复合微粒/金属基体的组分可改进镀层,获得所需的性能,以满足特别的需求。在对这些复合镀层的应用需求正在迫近与增长的同时,其市场正在迅速扩张。本文开发出了一种合适的复合化学镀镍液,并通过维氏硬度法对化学复合镀镍层进行了表征。采用动电位极化及交流阻抗法测定了镀层的Taber耐磨性能及耐蚀性能。采用SEM及XRD对复合镀层的表面形貌进行了分析。     

Tribological and corrosion behaviors of fluorocarbon coating reinforced with sodium iron titanate platelets and whiskers

A series of sodium iron titanate (NFTO)–fluorocarbon composite coatings have been prepared with the liquid-phase blending method. The effects of two types of NFTO, NFTO platelets, and NFTO whiskers, on the tribological and corrosion behaviors of the composite coatings, are systematically studied. The results show that the addition of NFTO can significantly enhance the friction-reducing and wear resistance performances of the fluorocarbon coating. Under dry sliding, the minimum specific wear rate is 1.67 × 10⁻⁴ mm³/Nm for the platelet-filled composite coatings and 1.15 × 10⁻⁴ mm³/Nm for the whisker-filled composite coatings, respectively, showing a decrease of 83.5 and 88.6% than that of pure coating. Under a simulated seawater environment, the minimum specific wear rate is 5.44 × 10⁻⁵ mm³/Nm for the platelet-filled composite coatings and 0.84 × 10⁻⁵ mm³/Nm for the whisker-filled composite coatings, respectively, showing a decrease of 90.5 and 98.5% than that of pure coating. The morphologies of worn surfaces, wear debris, and transfer films are analyzed, and the corresponding wear resistance mechanisms are discussed. The electrochemical impedance spectroscopy certifies a remarkably improved corrosion resistance of the composite coatings which have been immersed in 3.5 wt % NaCl solution for 30 days. The composite coating reinforced with 7.5 wt % platelets shows the highest resistance of 256.3 × 10⁶ Ω·cm², approximately two orders of magnitude higher than that of pure coating. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48936.