Papers by Keyword: Electroless Plating (EP)

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Authors: Xu Wang
Abstract: An environment-friendly surface etching and activation technics for ABS surface metallization were investigated as a replacement for conventional chromic acid etching bath and palladium catalyst. After etching by H2SO4-MnO2 colloid, the ABS surfaces became roughness; meanwhile the carboxyl and hydroxyl groups were formed on the surface. With absorption and a reduction by a dimethylamineborane solution, nickel particles were deposited on the ABS surface, which serves as a catalyst replacement for SnCl2/PdCl2 colloid. The effects of NiSO4 concentration, (CH3) 2NHBH3 concentration, reduction temperature and reduction time on the adhesion strength between the ABS surface and the electroless copper film were investigated.
Authors: Yong Wei Song, Da Yong Shan, En Hou Han
Abstract: Magnesium alloys are considered as “difficult to plate” metal. The pretreatment processes play a key role for plating. The pretreatments of alkaline cleaning, chromic acid etching and hydrofluoric acid activating were carried out and the microstructures investigated by SEM and EDAX in detail. The hydrofluoric acid activating time of 8 minutes was determined by Potential-Time curve. The experimental results showed that the alkaline cleaning moved the grease and oils off the substrate surface, but there was no apparent surface morphology change. The chromic acid etching was a very critical step, and the optimum etching time of 1 minute was chosen; the eutectic α was severely etched, and the chromic compounds were mainly formed on the surface. During the hydrofluoric acid activating, the white activating product of magnesium fluoride was preferentially generated on the β–phase, and obvious morphology change has been observed on the alloy substrate surface.
Authors: Li Na Yu, Jun Zhao, Ling Di Shen, Yan Gao, Xue Fen Wang
Abstract: Silver-coated PAN nanofibers have been prepared by a facile method that combined the electrospinning technique and electroless plating method. Dopamine was used to functionalize the surface of electrospun PAN nanofibers to form the chemisorption sites in order to assist electroless plating of silver. SEM and ATR-FITR results indicated that poly(dopamine) has been successfully deposited on the surface of PAN nanofibers. XRD and SEM results also showed that face-centred cubic (fcc) crystal Ag nanoparticles with uniform size were well coated on the surface of electrospun PAN fibers.
Authors: Ki Young Yoon, Jeong Hoon Byeon, Byung Ju Ko, Jae Hong Park, Chul Woo Park, Jung Ho Hwang, Hee Seung Yoon
Abstract: Copper (Cu) and silver (Ag) known as antimicrobial materials were deposited on activated carbon fibers (ACF) by an electroless plating method. The metal deposited ACF filters were characterized by using SEM, EDX and XRD analyses. To verify the effects of metal deposition on the adsorptive characteristics of ACF filters, the specific surface area and pore structure were determined by BET equation and BJH method, respectively. The antimicrobial activities of metal deposited ACF filters against E. coli, P. fluorescens, B. subtilis and M. luteus were characterized by modified Kirby-Bauer method. By SEM-EDX and XRD analyses, it was confirmed that the electroless plating method was adequate for deposition of Cu and Ag on the surface of ACF filters. BET and BJH analyses showed that the micropore volume of metal plated ACF filters decreased compared to the pristine ACF filter. The inhibition zones, which represent the antimicrobial effects, were formed around the Cu and Ag deposited ACF filters whereas not in the case of pristine ACF.
Authors: Mathieu Brochu, C.A. León, Robin A.L. Drew
Authors: Pornthep Chivavibul, Manabu Enoki, Shigeru Konda, Yasushi Inada, Tamotsu Tomizawa, Akira Toda
Abstract: A possibility to reduce core loss in non-oriented (NO) electrical steel by applying magnetic coating has been investigated. This technique involves electroless plating of magnetic coating onto the surface of electrical steel. The material system was NiCoP coatings with different thicknesses (1, 5, and 10 􀁐m) deposited onto the surface of commercially available Fe-3%Si NO electrical steel. Characterization of deposited NiCoP coating was carried out using X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray (EDX) spectrometer. The deposited Ni-Co-P coatings were amorphous/nanocrystalline and composed of 56-59% Ni, 32-35% Co and 8-10% P by mass. Effect of coatings on core loss of the electrical steel was determined using a single sheet test. A core loss reduction was achieved with the NiCoP coating with a thickness of 1 􀁐m magnetized at a magnetic flux density of 0.3T.
Authors: Gui Mei Shi, Wei Min Sun, Da Wei Lu, Shu Lian
Abstract: Fe nanoparticles with shell of Ni-P coating layer were successfully synthesized using Ni electroless plating process. Electromagnetic-wave absorption of Ni-P coated Fe nanoparticles has been investigated. In contrast to earlier reported materials, the absorption amplitude of as-prepared samples is found not largely decrease with increasing absorption-layer thickness. A reflection loss (RL) exceeding -20 dB can be obtained for almost the whole frequencies within the 2-18GHz range by choosing an appropriate layer thickness between 0.9 and 6.0mm. The broadest bandwidth (RLu-bands(12-18GHz), is obtained for 1.1mm layer. At the same time, it is worth noticing that in a thin thickness range 0.91-2.0mm, the reflection loss (RL) exceeding -10 dB in the 6-18GHz range is obtained, which covers half of C-bands (4-8GHz), the whole X-bands (8-12GHz) and Ku–bands (12-18GHz).
Authors: Mettaya Kitiwan, Duangduen Atong
Abstract: The palladium membrane has been developed for high temperature separation of hydrogen from other syngas molecules. In this study, tubular α-alumina substrate was used as a support for increase mechanical strength for thin palladium membrane. Prior depositing of palladium film, a dip-coating of palladium nuclei was performed to cover the substrate. Afterward, surface of activated support was modified with a thin intermediate layer for improving adhesion between support and Pd membrane. Electroless plating of dense palladium membrane was achieved from the plating bath containing EDTA stabilized palladium complex and hydrazine. The microstructural characteristics of palladium membranes were analyzed.
Authors: Shou Xiang Jiang, Rong Hui Guo, Guang Hong Zheng
Abstract: The present study is performed with an objective to acquire a deeper understanding of the properties of Ag-plated silk fabric. The surface modification of electroless Ag-plated silk fabric was characterized by scanning electron microscopy (SEM). It is found that a layer of fine Ag particles distributed evenly on the fabric surface with uniform grains. Functional properties of Ag-plated silk fabric were also evaluated. The results show that Ag-plated silk fabric possesses good anti-static property and excellent protection of ultraviolet radiation. In addition, the effective antibacterial activity of the Ag-plated silk against Escherichia coli and Staphylococcus aureus was determined. Therefore, the electroless Ag plating has opened up new possibilities in the modification of silk and is an exciting prospect for usage in textile design and technical textiles.
Authors: Xing Wu Guo, Shao Hua Wang, Hai Yan Yang, Li Ming Peng, Wen Jiang Ding
Abstract: Ni-P/TiO2 metal matrix composite (MMC) coatings were prepared by electroless plating process combined with sol-gel technology on Mg-3.0Nd-2.0Zn-0.4Zr (wt.%, NZ30K) magnesium alloys. The reinforcement of TiO2 nanoparticles was added into the solution of electroless plating in the form of transparent alcoholic sol. The microstructures and compositions of the prepared Ni-P/TiO2 MMC coatings were investigated by Field Emission Scanning Electron Microscopy (FE-SEM). The phase composition of the coating was analyzed by X-ray diffraction (XRD) facilities. It was found that the TiO2 nanoparticles were highly dispersed in the coating matrix. The microhardness of Ni-P/TiO2 MMC coating was far higher than those of NZ30K substrate and Ni-P coating due to the incorporation of in-situ formed TiO2 nanoparticles. Electrochemical measurements indicated that the corrosion resistance of Ni-P/TiO2 MMC coatings was superior to NZ30K substrate but no obvious significant change could be seen compared to Ni-P coating.
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