Ni-纳米SiO2复合镀层耐蚀性的初探

制备了纳米氧化硅—镍复合镀层材料，并利用静态浸泡法对纯镍镀层和由镀液中不同微粒含量制备的复合镀层耐蚀性能进行研究，讨论了镀液中纳米微粒含量对镀层抗蚀性的影响，并用扫描电镜观察镀层的表面形貌。     

镍-碳化钨纳米复合镀层的制备与性能

采用电镀的方法制备出Ni-WC纳米复合镀层,镀液组成为:NiSO4·7H2O 250 g/L,NiCl2·6H2O 30 g/L,H3BO3 30 g/L,光亮剂0.1 g/L,纳米WC颗粒5～ 30 g/L,表面活性剂及分散剂适量.研究了温度、电流密度及pH对复合镀层外观的影响,得到最佳电镀工艺条件为:温度50～55...     

纳米复合镀层的研究历程

总结了纳米复合镀层的研究结果,纳米复合镀层具有硬度高、耐磨损和耐腐蚀的特性,一些纳米复合镀层还具有自润滑性、光催化活性、良好的电接触性及耐高温等性能。纳米复合镀层的基体材料主要是金属镍,还有铜和锌等。纳米粒子材料包括SiC、SiO2、CeO2、金刚石、碳纳米管、Al2O3、Si3N4、TiO2、PTFE、MoS2、WS2、石墨、ZrO2、La2O3、Cr、Ag及Si微粒等。目前,纳米复合镀层的制备技术还不成熟,需要进行更深入的研究。     

电刷镀含纳米SiC粉复合镀层试验研究

本文应用电刷镀技术制备了含有纳米ＳｉＣ粉的镍基复合镀层,对该复合镀层的显微硬度和摩擦学性能进行了测试,并讨论了主要工艺参数对这些性能的影响规律。文中还采用ＯＭ和ＥＰＭＡ研究了该复合镀层的组织、表面形貌和元素分布特点,在此基础上提出了纳米粉与镍共沉积的机理。     

镍基纳米复合镀层的研究进展

综述了镍基纳米复合镀层的研究现状。阐述了复合镀层的沉积机理、纳米微粒在复合镀层中的作用机理、纳米微粒在镍基镀液中的分散以及镍基纳米复合镀层的种类和性能。指出了纳米复合镀技术研究中存在的问题和发展方向。     

镍基纳米复合镀层的研究现状

镍基纳米复合镀层中由于复合纳米颗粒的特性而被广泛应用。就国内外镍基纳米复合镀层的研究现状进行了分析,对镍基纳米复合镀层的沉积机理、镀层结构特点、影响纳米颗粒与镍金属电沉积的主要工艺因素、镀层性能及应用进行了阐述。当前具有更优良硬度、耐磨性、耐腐蚀性、减摩性、催化功能和抗高温氧化性的镍基纳米复合镀层是行业的研究热点。对镍基纳米复合镀层的研究还属于初步阶段,理论研究还需进一步深入。     

纳米复合镀层的研究现状

近年来纳米材料成为研究的热点，纳米颗粒在复合镀层中的应用能显著提高镀层的硬度、耐磨性、耐蚀性、耐高温性能，具有优良的减摩特性。本文综述了近年来有关纳米颗粒在复合镀层制备过程中的沉积机理及其研究与应用现状。     

化学镀Ni-P/PVDF复合镀层耐腐蚀性能研究

用化学镀法在20CrMo钢表面制备了Ni–P合金镀层和Ni–P/PVDF复合镀层。用扫描电镜观察了镀层的组织形貌,通过电化学实验和盐雾试验测试了镀层的耐蚀性能。20CrMo钢化学镀Ni–P合金和Ni–P/PVDF复合镀层后,腐蚀电位从?625mV分别提高到?510mV和?470mV,腐蚀电流密度从25.1A/cm2降低到19.9A/cm2和14.1A/cm2。结果表明,化学镀Ni–P合金和Ni–P/PVDF复合镀层均可提高20CrMo钢的耐蚀性能,而Ni–P/PVDF复合镀层的耐蚀性优于Ni–P合金镀层。     

纳米复合镀层的制备及性能研究

以铁片作为基材,采用电镀工艺制备Ni-ZrO2纳米复合镀层。研究了温度、pH值、时间及ZrO2的质量浓度对复合镀层性能的影响。通过实验得出最佳的工艺参数为:ZrO21.5g/L,pH值4～5,50℃,60min。采用扫描电子显微镜观察复合镀层的微观形貌,并通过XRD分析其相组织成分。结果表明:复合镀层表面光亮,微粒均匀、细小;其相组织成分主要为Ni,ZrO2和Ni-ZrO2。     

镍-纳米二氧化钛复合镀层的制备及性能

以多孔泡沫镍为基体,通过在瓦特镀镍液中复合电沉积,得到Ni-TiO2复合镀层.研究了阴极电流密度、pH、时间、镀液中纳米TiO2质量浓度及分散剂种类对Ni-TiO2复合镀层的TiO2含量、表面形貌及光催化性能的影响.通过正交试验得到最佳工艺条件为:TiO2质量浓度10g/L,pH=4.0,阴极电流密度30 mA/cm2...     

纳米/微米复合二氧化钛改性聚氨酯涂层的耐腐蚀性能研究

以微米/纳米二氧化钛(TiO2)为复合填料制备了聚氨酯防腐涂层,采用电化学阻抗谱(EIS)评估含不同用量纳米TiO2涂层在0.5mol/L氯化钠溶液中的耐腐蚀性,结果表明,纳米二氧化钛能有效提高涂层的抗腐蚀能力,其适宜用量为1.0%～1.5%。热分析(包括DSC和TG)结果表明,在有大尺度填料存在的条件下,添加纳米二氧化钛对涂层的热稳定性影响不大。     

复合硅烷/锌涂层耐腐蚀性能的研究

通过电导率监视仪对硅烷的水解过程进行监控,确定了KH560的水解时间为3h,含不同质量分数鳞片锌粉的硅烷/锌复合液的水解时间为12h。将硅烷/锌水解液涂覆到低碳钢表面,制备了复合硅烷/锌涂层。通过盐雾试验、极化曲线和交流阻抗谱研究了不同锌粉含量的硅烷/锌复合涂层的耐蚀性能,通过扫描电镜观察了涂层的截面形貌,探讨了硅烷/锌复合涂层的耐蚀机理。结果表明,复合硅烷/锌涂层的耐蚀性能随着锌粉含量的增加而提高,鳞片锌粉的最大添加量为45%。此含量下的复合硅烷/锌涂层的耐蚀性能最好,中性盐雾时间达576h,是纯硅烷涂层的12倍。在此硅烷/锌复合涂层中,鳞片锌粉以平行叠加的方式组成致密的网状结构,从而延长了腐蚀性介质到达金属基材的时间,使涂层的耐蚀性能得到明显提高。     

A study of the corrosion resistance of a waterborne acrylic coating modified with nano-sized titanium dioxide

The incorporation of nano-sized inorganic pigment particles into organic coatings may offer the potential for improving many of their properties, including corrosion resistance, at relatively low loadings. In the present research, titanium dioxide with a crystallite size of 5-10 nm was added to a waterborne organic primer formulation at loadings from 0.1 to 5% (w/w) and applied to hot-dip galvanized steel (HDG) panels. The corrosion resistance of the modified coatings was measured by neutral salt spray corrosion testing and electrochemical impedance spectroscopy (EIS), with an unpigmented film tested for comparison. 3% (w/w) TiO₂ appeared to produce an optimum improvement in the corrosion resistance.     

Efficient one-step fabrication of superhydrophobic nano-TiO2/TMPSi ceramic composite coating with enhanced corrosion resistance on 316L

TiO₂ Nanoparticle/Trimethoxy(propyl)silane (TMPSi) ceramic composite coating was deposited on 316L steel using a one-step electrophoretic deposition (EPD) method. Silane coupling agent (TMPSi) was added to the EPD bath in different concentrations (from 0.5 to 15 vol %) to decrease the surface energy of the deposited coating. TiO₂ coating is hydrophilic whereas by adding varying concentrations of TMPSi, the obtained nanocomposite coating showed much better hydrophobicity. Surface wettability was measured by water contact angle (WCA) and sliding angle (SA) tests. Moreover, the effect of TMPSi concentration was determined by comparing the WCA and SA values. Surface morphology was studied through Field Emission Scanning Electron Microscopy (FESEM), and the presence of micro/nano meter roughness on the surface was confirmed. The distribution of elements were investigated by EDS analysis in which their uniform dispersion was observed. Corrosion behavior of 316L samples before and after the coating process was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests in 3.5 wt % NaCl solution. The polarization curve proved that the superhydrophobic ceramic nanocomposite coatings (WCA = 168° and SA = 3.1°) were able to decrease the corrosion rate of bare 316L (from 12.180 to 5.621 (μm per year)).     

Biocompatibility,corrosion resistance and antibacterial activity of TiO2/CuO coating on titanium

In this work, TiO₂/CuO coating was prepared on titanium (Ti) by combination of magnetron sputtering and annealing treatment. The microstructure, biocompatibility, corrosion resistance and antibacterial property of TiO₂/CuO coating were investigated in comparison with pure Ti and TiO₂ coating. The results show that TiO₂/CuO coating is mainly composed of TiO₂ and CuO. In vitro cytocompatibility evaluation suggests that no obvious toxicity appears on the TiO₂/CuO coating, and the coating stimulates the osteoblast spreading and proliferation. Compared with Ti and TiO₂ coating, TiO₂/CuO coating exhibits improved corrosion resistance and antibacterial ability against S.aureus. This study is the first attempt to apply the combination of magnetron sputtering and annealing treatment to introduce the Cu into TiO₂ coating for surface modification of Ti-based implant materials, which may provide a research foundation for further development of bioactive multifunctional coatings to meet the better clinical demand.     

Modification of Cr/CrN composite structure by Fe addition and its effect on decorative performance and corrosion resistance

A CrN ceramic coating is a promising substitution for electroplated Cr (Ⅵ) hard coatings; however, it has not yet replaced a decorative Cr (Ⅵ) layer owing to its low reflectivity of visible light and relatively poor corrosion resistance. A Cr/CrN composite structure can address these shortcomings. Our recent work demonstrated that an addition of Fe can facilitate the densification of hot-pressed Cr sputtering targets and enhance the mechanical properties of Cr/CrN composite coatings. In this work, we focus on reporting optical properties and corrosion resistance of the Fe-modified Cr/CrN layers for decorative applications, and clarifying the effect of Fe on these performances. The results show that Fe can increase the amount of metallic phase in the Cr/CrN composite structure and helps enhance its reflectance in the visible region. The composite coating deposited by Cr₉₀Fe₁₀ (at.%) target/alloy exhibits a greater reflectivity of visible light and a better corrosion resistance than those of a single-phase CrN coating. This is attributed to its fine microstructure, which is beneficial for a dense and smooth surface. The color of the coating can be controlled by both the partial pressure ratio of N₂ during deposition and the Fe content in the Cr-Fe sputtering target. The present results show that the addition of Fe can lead to the reduction in the processing cost of Cr targets, enhance the mechanical properties of the composite coatings, and broaden the deposition window. Such cost-effective Fe-modified Cr/CrN composite coatings are expected to be used in various decorative applications.     

双向脉冲电镀纳米级镍镀层耐腐蚀性能研究

用直流电沉积法制备了普通光亮镍镀层,同时用双向脉冲电镀制备了纳米级镍镀层。用X射线衍射(XRD)、扫描电镜(SEM)等方法研究了镀层的晶粒尺寸、组织结构和表面形貌,通过孔隙率测定、盐雾试验、静态浸泡腐蚀失重试验和电化学方法等测试了镀层的耐蚀性能。结果表明,采用双向脉冲电流制备的纳米级镍镀层的耐蚀性明显优于普通直流镍镀层。     

纳米SiO_2改性外墙涂料的研究

介绍了纳米材料改性高性能建筑外墙涂料的配方及研制,着重讨论了纳米SiO2添加量对涂料性能的影响:掺入4%的纳米SiO2能明显改善涂膜的附着力、光泽度、耐水、耐碱、耐洗刷性和涂料的抗沾污性、触变性能、稳定性。     

Influence of the size of spraying powders on the microstructure and corrosion resistance of Fe-based amorphous coating

The Fe-based amorphous coatings with the composition of Fe₄₈Cr₁₅Mo₁₄C₁₅B₆Y₂ were successfully sprayed on mild steel substrate by the high velocity oxygen fuel (HVOF) spraying process with different feedstock powder sizes (i.e., powder A: −33 + 20 μm, powder B: −45 + 33 μm, powder C: −55 + 45 μm). The coatings were characterized for its morphology, microstructure and thermal stability by using X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The corrosion behavior of the coatings in 3.5 wt% NaCl solution was studied with potentiodynamic and potentiostatic polarization test. It was found that the particle size of the feedstock powders had a significant influence on microstructure and corrosion resistance of the resultant coatings. The coatings sprayed with the finest powders show the most compact structure; while the coating with the coarser powders exhibits a better corrosion resistance. It is found that the corrosion resistance of the coatings is closely related to the wetting behavior which is affected by the oxygen content and the roughness of coatings. The coatings with hydrophobicity exhibit a better corrosion. The present result demonstrates that the amorphous coatings with hydrophobicity and excellent corrosion resistant are promising for industrial application in marine environment.