scholarly journals Pd-Free Activation Pretreatment for Electroless Ni-P Plating on NiFe2O4 Particles

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1810
Author(s):  
Junfei Ma ◽  
Zhigang Zhang ◽  
Yihan Liu ◽  
Xiao Zhang ◽  
Hongjie Luo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electroless Plating ◽  
Coating Layer ◽  
Production Costs ◽  
Preparation Process ◽  
Catalytic Activation ◽  
New Process ◽  
Coating Layers ◽  
Electroless Ni ◽  
Scanning Electron

A Pd-free activation pretreatment process was developed for electroless Ni-P plating on NiFe2O4 particles. The main influencing factors, including NiCl2·6H2O concentration, pH of electroless bath and temperature, were investigated. Microstructures of the coating layers were characterized by scanning electron microscopy. It was found that a more uniform and compact Ni-P coating layer was successfully formed by electroless plating via Pd-free activation pretreatment than Pd as sited plating. The coating layers plated by Pd-free activation pretreatment were thicker than those by the sensitization and activation pretreatment on average (9 vs. 5 μm). The new process did not need conventional sensitization or activation pretreatments, because the Ni particles dispersed uniformly on the NiFe2O4 substrate became catalytic activation sites for nickel electroless plating. Such improvement was beneficial to shortening the preparation process and reducing the production costs with the use of noble metal Pd.

SiC Particles Concentration Dependent the Properties of Electroless Ni-P-SiC Coatings

2012 ◽  
Vol 457-458 ◽  
pp. 146-149
Author(s):  
Yan Hai Cheng ◽  
Shi Ju Zhang ◽  
Yu Xing Peng ◽  
Fang Fang Xing ◽  
Jie Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Particle Concentration ◽  
Composite Coatings ◽  
Sic Particles ◽  
Plating Solution ◽  
Electroless Ni ◽  
Sic Coatings ◽  
Scanning Electron ◽  
Sic Particle

In this study, Ni-P-SiC composite coatings were prepared by adding different amount of SiC particles into electroless Ni-P plating solution. The effects of SiC particles concentration in solution on depositing rate and composition of the coatings were investigated. The different SiC contents in coatings could be obtained by adjusting the amount of SiC particle concentration in electroless plating solution. Scanning electron microscopy (SEM) results indicate that SiC particles are dispersed in the composite coating and Ni-P alloy is mainly as a bond metal envelope with SiC particles. At the same time, the microhardness became increased and the wear resistance improved with the increasing of SiC content.

The Study of Electroless Ni-B Coating on 45 Steel

2012 ◽  
Vol 501 ◽  
pp. 185-189
Author(s):  
Jian Zhang Guo ◽  
Qian Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Corrosion Resistance ◽  
Energy Dispersive Spectrometer ◽  
Salt Spray ◽  
High Hardness ◽  
Experimental Results ◽  
Electroless Ni ◽  
Scanning Electron ◽  
Optimal Formula

In order to improve the corrosion resistance and the hardness of the 45 steel, under comparison tests, the electroless Ni-B was prepared on the 45 steel. We made a contrast test to get the optimal formula. The coating under the optimal formula was characterized by Scanning Electron Microscopy(SEM), Energy Dispersive Spectrometer(EDS), metallurgical microscope and salt spray cabinet. The experimental results showed that the electroless Ni-B coating on 45 steel was low boron coating, with high hardness, and the hardness of the coating could catch HV524; the thickness of the coating was 16μm.

Crack analysis of barrier coatings based on starch and starch-PVOH with and without plasticizer

2018 ◽  
Vol 33 (2) ◽  
pp. 336-347 ◽  
Author(s):  
Asif Javed ◽  
Peter Rättö ◽  
Lars Järnström ◽  
Henrik Ullsten
Keyword(s):  
Electron Micrographs ◽  
Coating Layer ◽  
Transmission Rate ◽  
Scanning Electron Micrographs ◽  
Barrier Coatings ◽  
Oxygen Transmission Rate ◽  
Barrier Coating ◽  
Coating Layers ◽  
Oxygen Transmission ◽  
Scanning Electron

Abstract Barrier coatings based on starch and starch-PVOH plasticized with glycerol and without plasticizer were applied to two different paperboard substrates, a triple coated board and duplex board, in order to investigate the tendency for cracks to develop in the barrier coating layers during creasing and folding. Tensile properties of films based on the starch and starch-PVOH blend were determined to investigate the relationship between the flexibility of the films and the cracking in the barrier coating layers. Furthermore, the oxygen transmission rate through the barrier-coated paperboard was measured before and after creasing and folding. The oxygen transmission rate through the barrier-coated samples was over the measurable range i. e. \text{OTR}>10000\hspace{0.1667em}{\text{cm}}^{3}/{\text{m}}^{2}\hspace{0.1667em}\text{day} after creasing and folding, which indicated failure in the barrier coating layers. Optical microscopy revealed small cracks in the barrier coating layers, probably related to an increase in flexibility of the barrier coating layers. It was observed in scanning electron micrographs that cracks in the barrier coating layers seemed to follow the fibers when the barrier coating was applied on the rear side of the duplex board. Scanning electron micrographs and surface profiler images revealed that cracks in the barrier coating layers might have originated from the mineral coating layer when the starch and starch/PVOH coating layers were applied on the mineral-coated side of the triple coated board. An increase in the thickness of the barrier coating layer did not seem to increase the resistance to failure.

Preparation of Pd /α–Al2O3 and Pd-Ag/α–Al2O3 Membranes by Electroless Plating and Permeation Measurements

2012 ◽  
Vol 1372 ◽  
Author(s):  
L. Ortiz-Martínez ◽  
M. Torres-Rodríguez ◽  
M. Gutiérrez-Arzaluz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electroless Plating ◽  
Energy Dispersive Spectroscopy ◽  
Ceramic Composite ◽  
Composite Membranes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Α Al2o3 ◽  
Scanning Electron

ABSTRACTIn this work, the synthesis of dense Pd/α–Al2O3 and Pd-Ag/α–Al2O3 ceramic composite membranes was done through the sequential electroless plating technique of Pd and Ag. The precursors are solutions of PdCl2 and AgNO3 and N2H4 salts, as reducing agent. The membranes were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Energy Dispersive Spectroscopy (EDS). The permeation tests of H2 and N2 was carried out at 20 psi of pressure and at 25°C, resulted πH2=5.2x10-9 mol H2/m2·s·Pa and πN2=8.2x10-10 mol N2/m2·s·Pa.

Effect of glycine as a complex agent on the surface and corrosion properties of Ni-P and Ni-P/Al2O3 electroless coating

2020 ◽  
Vol 67 (6) ◽  
pp. 593-603
Author(s):  
Refaie Omar ◽  
Elsayed Oraby ◽  
Yasser Abdelrhman ◽  
Mohammed Aboraia
Keyword(s):  
Electron Microscope ◽  
Coating Layer ◽  
Complexing Agent ◽  
Corrosion Properties ◽  
Plating Bath ◽  
Electroless Coating ◽  
Content Type ◽  
Complex Agent ◽  
Coating Layers ◽  
Scanning Electron

Purpose The ability to produce a uniform composition, high corrosion resistance with a hard coating layer during the electroless coating techniques are mainly based on the plating bath composition. The complexing agent is one of the most important components that control the coating layer properties. This paper aims to investigate the effect of the glycine as a complex agent on the surface and corrosion properties of Ni-P and Ni-P/Al2O3 electroless coating. Design/methodology/approach In this study, the effect of glycine as a complexing agent on the final surface and corrosion properties of the Ni-P and Ni-P/Al2O3 coatings has been investigated. The surface morphology and composition of the coated samples were investigated by scanning electron microscope (SEM) imaging and energy dispersive x-ray spectroscopy (EDS) analysis. Linear polarization scan and electrochemical impedance spectroscopy techniques were used to investigate the corrosion properties of the coating layer. Findings The results clarify that, glycine has a remarkable effect on the porosity content of Ni-P and Ni-P/Al2O3. It was found that increasing of glycine concentration results in higher porosity content in the coating layers. Also, the porosity in the coating layers minimizes the protectability of the coating against corrosion. The results also show that adding nano-alumina (Al2O3) to the coating path has improved the corrosion properties by decreasing the porosity in the coating layer. The scanning electron microscope (SEM) images showed that the concentration of glycine affects the content and distribution of alumina nanoparticles embedded in the coating layer. Also, it was observed that using a high concentration of glycine (0.4 M glycine), the alumina tends to agglomerate and the final alumina content in the coating was decreased. Originality/value The present study reveals that the quality of the final coating plays a major role in the corrosion performance of the steel substrate. The coating quality can by improve remarkably by optimization of the complexing agent used in the plating bath, to minimize the porosity involve in the coating layer.

Surfactants Effect on the Photoactivity of Fe-Doped TiO2

2013 ◽  
Vol 743-744 ◽  
pp. 367-371 ◽  
Author(s):  
Qing Yun Chen ◽  
Chao Xue ◽  
Xiang Lin Li ◽  
Yun Hai Wang
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Preparation Process ◽  
X Ray Diffraction ◽  
Sunlight Irradiation ◽  
X Ray ◽  
Degradation Ratio ◽  
Scanning Electron

Ti (OC4H9)4 was used as the Ti precursor and titanium dioxide (TiO2) was prepared by sol-gel method. During the preparation process, Fe3+ was doped and different surfactants, such as SDS, PEG, CTAB, were added to improve the photocatalytic activity of TiO2. The effect of the different type of surfactants on the structure of Fe-doped TiO2 was discussed. The photocatalysts were characterized by thermogravimetric thermal analysis, X-ray diffraction, scanning electron microscopy and UV-Vis spectrophotometer. The red shift of the absorption edge of the Fe-doped TiO2 prepared by using different surfactants was observed. Methyl orange (MO) solution was degraded under sunlight irradiation to evaluate the photocatalytic performance. The results indicated that the photocatalyst prepared with PEG addition had the highest activity and MO degradation ratio could reach 90% after 4 hours irradiation with the best photocatalyst.

Preparation of Electroless Ni-Mo Coated TiC Powder

2010 ◽  
Vol 434-435 ◽  
pp. 522-525
Author(s):  
Wu Peng ◽  
Yong Zheng ◽  
Quan Yuan ◽  
Hai Zhou Yu ◽  
Shao Gang Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Thin Layers ◽  
Surface Microstructure ◽  
X Ray ◽  
Unknown Phase ◽  
Supersaturated State ◽  
Diffraction Peaks ◽  
Electroless Ni ◽  
Scanning Electron

Ni-Mo coated TiC powders were prepared by electroless plating technique assisted by ultrasonic wave with hydrazine as reducing agent. The surface microstructure of the Ni-Mo coated TiC powders was characterized with scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffractometry (XRD). The results showed that the as-plated powders, which were of nearly spheric shape, were the composite of TiC and Ni-Mo alloy. The Ni and Mo elements were uniformly distributed around the TiC powders with some plating leakage. In addition, the Ni-Mo plated thin layers on the surface of TiC powders were amorphous or microcrystalline in a supersaturated state. Diffraction peaks corresponding to Ni and Mo weren’t found, and the Ti (NO3)4 and an unknown phase were formed as the load decreased from 15 g/L to 5 g/L.

scholarly journals Recovery Of Electrodic Powder From Spent Lithium Ion Batteries (LIBs)

2015 ◽  
Vol 60 (2) ◽  
pp. 1145-1149 ◽  
Author(s):  
S.M. Shin ◽  
G.J. Jung ◽  
Woo-Jin Lee ◽  
C.Y. Kang ◽  
J.P. Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Inert Atmosphere ◽  
X Ray Diffraction ◽  
Recycling Process ◽  
X Ray ◽  
New Process ◽  
Scanning Electron

Abstract This study was focused on recycling process newly proposed to recover electrodic powder enriched in cobalt (Co) and lithium (Li) from spent lithium ion battery. In addition, this new process was designed to prevent explosion of batteries during thermal treatment under inert atmosphere. Spent lithium ion batteries (LIBs) were heated over the range of 300°C to 600°C for 2 hours and each component was completely separated inside reactor after experiment. Electrodic powder was successfully recovered from bulk components containing several pieces of metals through sieving operation. The electrodic powder obtained was examined by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), and atomic absorption spectroscopy (AA) and furthermore image of the powder was taken by scanning electron microscopy (SEM). It was finally found that cobalt and lithium were mainly recovered to about 49 wt.% and 4 wt.% in electrodic powder, respectively.

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