镍基合金镀层的研究现状

电镀镍层具有良好的耐蚀性、耐磨性和装饰性,电镀镍基合金及其复合镀层能够进一步提高电镀镍层的综合性能,受到了广泛的研究和应用。综述了脉冲电镀和超声波搅拌对镀层性能的影响,介绍了电镀镍基合金及其复合镀层的研究现状和发展趋势。     

镍基合金镀层及其复合镀层磨蚀特性的研究

本文探讨了镍基合金镀层、镍基合金复合镀层及对比镀层的磨蚀特性.结果表明非晶态镍基合金及其复合镀层具有最佳抗磨蚀性能.     

镍-钴合金镀层研究进展

镍-钴合金镀层由于其性能优异,被广泛用于零部件的表面装饰与防护。近年来在纳米复合技术发展的基础上,镍-钴合金镀层获得了新的研究和应用。简述了电沉积镍-钴合金的沉积原理,重点综述了镍-钴合金镀层主流镀液体系、镀层性能和镀层的最新进展,并对镍-钴纳米复合镀层的发展进行了展望。     

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.     

船用柴油机活塞杆表面微粒增强镍基复合镀层的制备及其性能分析

采用电沉积方法,在船用柴油机活塞杆表面分别制备纳米微粒增强镍基复合镀层、亚微米微粒增强镍基复合镀层和微米微粒增强镍基复合镀层。分析了三者的显微形貌、晶相结构及磨痕形貌,并测定了硬度。结果表明:与亚微米微粒增强镍基复合镀层和微米微粒增强镍基复合镀层相比,纳米微粒增强镍基复合镀层的外观显得更加光亮,硬度接近5 800 MPa。     

电沉积高硬度复合镀层的研究与进展

近年来,电沉积复合镀层由于其独特的物理、化学、生物和机械性能而得到了迅速发展,综述了电沉积高硬度复合镀层的研究与进展,重点介绍了电沉积高硬度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建议.     

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...     

铝基体复合电沉积镍–碳纳米管复合镀层

采用电沉积法在铝基体上制备了镍–碳纳米管复合镀层,探讨了镀液中碳纳米管含量、电流密度、搅拌速率、温度、电镀时间等因素对镀层碳纳米管含量和厚度的影响,得出制备镍–碳纳米管复合镀层的适宜工艺条件为:碳纳米管质量浓度4 g/L,电流密度8 A/dm2,搅拌速率440 r/min,温度40°C,沉积时间40 min。采用扫描电镜和X射线衍射仪对镀层表面形貌和成分进行分析,通过电化学测试比较了不同镀层在不同腐蚀介质中的耐腐蚀性。与纯镍镀层相比,镍–碳纳米管复合镀层的晶粒尺寸更小,表面更粗糙,耐腐蚀性更好。     

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-纳米石墨复合镀层的制备及其性能表征

利用电沉积方法,在铜基表面制备了镍-纳米石墨复合镀层。讨论了镀液中纳米石墨的质量浓度对复合镀层性能的影响规律,同时分析了超声波的施加对提高复合镀层质量的作用。结果表明:当镀液中纳米石墨的质量浓度为3g/L时,所得镍-纳米石墨复合镀层的表面粗糙度为0.972 2μm,摩擦因数为0.255 8,呈现出良好的减摩性能。     

电沉积复合镀层的研究现状

近年来,电沉积复合镀层由于其独特的物理、化学、生物和机械性能而得到了迅速发展。在此,介绍了电沉积复合镀层的分类、特性及应用。     

稀土对电沉积Ni-W-B-SiC复合镀层

研究了加入稀土对电沉积Ni-W-B-SiC复合镀层的成份、结构、表面形貌、硬度等性能的影响规律.结果表明加入稀土有利于SiC与Ni-W-B的共沉积,使镀层结晶细化,RE-Ni-W-B-SiC复合镀层的硬度高于Ni-W-B-SiC复合镀层.     

盐酸介质中镍基合金镀层的电化学腐蚀行为

在含有硫酸镍、钨酸钠和柠檬酸三铵的电解液中获得镍一钨合金电沉积层。在分别含有二甲基胺硼烷和二氧化锆粒子的上述电解液中,电沉积获得Ni—W—B合金和Ni—w—(ZrO2)复合镀层。采用电化学实验方法研究所获得的Ni—W、Ni—W—B和Ni—W—(ZrO2)镀层在盐酸介质中的腐蚀行为,结果表明：所获得的镀层均有较好的耐蚀性;Ni—W和Ni—W—B镀层比Ni—W—(ZrO2)镀层有较好的抗腐蚀能力。     

工艺条件对电沉积RE-Ni-W-P-SiC-PTFE复合镀层性能的影响

研究了电流密度，镀液温度、pH值和PTFE等对电沉积RE-Ni-W-P-SiC-PTFE复合镀层性能的影响。结果表明，镀态下镀层的硬度在420-550Hv之间，当镀液中PTFE浓度为25ml/L时，磨损量最小，但镀层的耐蚀性却最差；而当镀液中PTFE浓度为30ml/L时，则具有良好的综合性能。     

The effect of bioactive glass nanoparticles on corrosion barrier performance and bioactivity of zinc oxide coatings electrodeposited on Ti6Al4V substrate

Zinc oxide coatings were electrodeposited on Ti6Al4V substrates from a nitrate bath with and without 1 wt% BG nanoparticles at ?1.2 and ?1.4 V_Ag/AgCl, where the former voltage created a spherical morphology, the latter developed a flower-like one. The spherical morphology was modified through the incorporation of BG nanoparticles, where surface roughness, wettability, and adhesion strength of the coating were enhanced. The coatings with spherical morphology also revealed complete barrier property after immersion in PBS solution. However, fully adverse effects were found for the coatings deposited at ?1.4 V_Ag/AgCl. This indicates that morphology is the most important factor determining the properties of ZnO and ZnO-BG coatings. The highest corrosion barrier performance was achieved for the ZnO-BG composite coating with spherical morphology. Although the composite coating with flower-like morphology did not provide complete barrier property at short immersion times, it earned that at longer times due to the plugging supported by the BG nanoparticles. The bioactivity tests in SBF at long times showed that the formation of Ca-P deposits on the surface of the composite coatings was noticeably improved.     

Electropolymerized bilayer coatings of polyaniline and poly(N-methylaniline) on mild steel and their corrosion protection performance

Polyaniline (PANI) and poly(N-methylaniline) (PNMA) have been electrodeposited on mild steel from oxalic acid bath using cyclic voltammetric technique. Pretreatments like passivation and primer polymer coatings were required for effective coating. Differently stacked composite polymer layers on the metal surface by layer-by-layer approach have also been obtained and their properties have been compared with their corresponding copolymer coatings. FTIR study confirms the formation of electroactive polymer compounds on mild steel. Evaluation of these coatings in 3.5% NaCl solution by potentiodynamic polarization and electrochemical impedance spectroscopy reveals significant corrosion resistant behavior. Relatively higher corrosion protection is exhibited by copolymer coatings and composite-bilayer coatings than the corresponding homopolymer coatings. The composite metal–PANI–PNMA layer shows higher stability and better protection than the metal–PNMA–PANI layer.     

Antibacterial polymeric coating based on polypyrrole and polyethylene glycol on a new alloy TiAlZr

In order to enhance properties of the polymer composite films, composite coatings based on polypyrrole (PPy) and polyethylene glycol (PEG), using various percentages of PEG (0.5%, 2%, 4%), were electrodeposited on a new titanium alloy electrode as insulating material. The structure of the coatings was investigated via infrared (FTIR) analysis, and the surface features were studied using contact angle determination, atomic force microscopy (AFM) and scanning electronic microscopy (SEM). When testing the antibacterial properties of the coatings, the best effect was found for the coating with 2% PEG concentration, which has hydrophilic character and small roughness. Such results are in concordance with mechanism of biomaterial–bacteria interaction which involves as factors affecting bacterial adhesion and growth an initial physicochemical interaction stage, where roughness and wettabilitty are factors promoting bacterial adhesion and biofilm deposition.     

(Ni-W-P)-SiC复合镀层的脉冲电沉积及其耐蚀性

研究了(Ni—W—P)—SiC复合镀层的脉冲电沉积工艺及耐蚀性。结果表明：(Ni—W—P)—SiC复合镀层的脉冲电沉积速率比直流电沉积大,脉冲镀层的耐蚀性优于直流镀层和1Cr18Ni9Ti不锈钢;脉冲频率和占空比对镀层的沉积速率、镀层成分以及镀层的耐蚀性都有较大的影响。     

Effect of nano-ZnO particles on the corrosion resistance of polyurethane-based waterborne coatings immersed in sodium chloride solution via EIS technique

Nano-composite coatings were formed by incorporating 3 wt% nano-ZnO in a polyurethane-based waterborne coating. The nano-ZnO based composite coatings were applied on standard phosphated steel panels by cathodic electrodeposition. The electrodeposited nano-composite coatings were then baked for 20 min at 165 °C. To investigate the corrosion resistance of the coatings, the coated panels were immersed in 3.5 wt% NaCl solutions for 2880 h (120 days). The improvement in corrosion performance of the composite coatings was evaluated using electrochemical impedance spectroscopy technique. It was found that the films containing nano-sized ZnO particles show a corrosion resistance of 2 orders of magnitude higher than that of the neat films.     

The effect of lignin on the structure and characteristics of composite coatings electrodeposited on titanium

Composite coatings based on lignin, obtained by electrophoretic deposition (EPD) on titanium, were investigated. The aim of this work was to produce hydroxyapatite/lignin (HAP/Lig) coatings on titanium and to investigate the effect of the lignin concentration on microstructure, morphology, phase composition, thermal behavior and cytotoxicity of the HAP/Lig coatings. An organosolv lignin was used for the production of the composite coatings studied in this research. The properties of HAP/Lig coatings were characterized using X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), attenuated total reflection Fourier transform infrared spectroscopy (ATR-FT-IR) and X-ray photoelectron spectroscopy (XPS), as well as the MTT test of cytotoxicity. The results showed that higher lignin concentrations protected the HAP lattice during sintering, thereby improving the stability of the HAP/Lig coatings. The cell survival of peripheral blood mononuclear cells (PBMC) after proliferation indicates that the HAP/Lig coating with 1 wt% Lig electrodeposited on titanium was non-toxic with significant promise as a potential bone-repair material.