Influence of pH on Electroless Ni-P-γAl2O3 Composite Plating on AZ91D Magnesium Alloy by Ultrasonic Wave

2014 ◽  
Vol 665 ◽  
pp. 95-98 ◽  
Author(s):  
Yong Zhe Fan ◽  
Jin Qiu ◽  
Rui Na Ma
Keyword(s):  
Electron Microscopy ◽  
Magnesium Alloy ◽  
Ultrasonic Wave ◽  
Ph Value ◽  
Deposition Rates ◽  
Az91d Magnesium Alloy ◽  
Composite Plating ◽  
Electroless Ni ◽  
Influence Of Ph ◽  
Scanning Electron

A dense electroless plating was obtained through the process of chemical Ni-P-γAl2O3 composite plating by ultrasonic wave. The influence of pH on deposition rate, microstructure, coating thickness and microhardness of the composite plating was studied. The deposition rates of the coating is the fastest at pH value of 7,which is 17.9×10-5g/cm2/min.The microstructure of the Ni-P-γAl2O3 coatings were analyzed by scanning electron microscopy (SEM). The results indicate that the influence of pH value on magnesium alloy is very large.And the composite coating obtained at pH value of 7 possesses optimal integrated properties, which shows uniform and compact. The plating obtained at pH value of 7 is the thicknest.

Optimizing of Pretreatment Process of Electroless Ni-P Plating on AZ91D Substrate

2011 ◽  
Vol 239-242 ◽  
pp. 1915-1918
Author(s):  
Guan Jun Liu ◽  
Zhou Yu ◽  
Li Jie Ma ◽  
Jun Cao
Keyword(s):  
Electron Microscope ◽  
Magnesium Alloy ◽  
Orthogonal Test ◽  
Bending Test ◽  
Az91d Magnesium Alloy ◽  
Plating Solution ◽  
Electroless Ni ◽  
Good Coating ◽  
Alternating Bending ◽  
Scanning Electron

In order to improve and simplify the process of electroless Ni-P plating on AZ91D magnesium alloy substrate, pretreatment process and deposite time were optimized by orthogonal test, the plating morphology were analysed using Quanta 200 type scanning electron microscope. The bond between the plating and aluminum substrate were evaluated using method of water quenching and alternating bending test. The results show that good coating can be obtained on AZ91D substrate under the condition of the acid electroless Ni-P plating solution with pickling time of 40-50s, activated time of 10 min. And the good bond between the coating and AZ91D substrate was obtained.

scholarly journals Study on synthesizing Mg/Al layered double hydroxides at different pHs

2014 ◽  
Vol 15 ◽  
pp. 36-39 ◽  
Author(s):  
E Otgonjargal ◽  
G Burmaa ◽  
B Enkhmaa ◽  
M Enkhtuul ◽  
L Nyam-Ochir ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Ph Value ◽  
Infrared Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ph Values ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Influence Of Ph ◽  
Scanning Electron

Mg/Al layered double hydroxide (LDH) was successfully synthesized at different pHs values. The Mg/AL LDH was well characterized by X-Ray diffraction and Fourier transform infrared analysis. The morphology of the LDH was observed using Scanning electron microscopy with energy dispersive X-ray spectroscopy. The influence of pH values on the morphology of the Mg/Al LDHs were studied. The result showed that the well-synthesized Mg/Al LDHs could be obtained when the pH value was about 10.0 at room temperature.DOI: http://doi.dx.org/10.5564/mjc.v15i0.319 Mongolian Journal of Chemistry 15 (41), 2014, p36-39

Preparation of Magnetic Polymer ICF Pellet by the Electroless Plating

2013 ◽  
Vol 423-426 ◽  
pp. 335-338
Author(s):  
Shao Bo Cui ◽  
Feng Wei He
Keyword(s):  
Electron Microscopy ◽  
Inertial Confinement Fusion ◽  
Ph Value ◽  
Complexing Agent ◽  
Inertial Confinement ◽  
Coating Quality ◽  
Confinement Fusion ◽  
Electroless Ni ◽  
Scanning Electron

The pretreating procedures on the inertial confinement fusion (ICF) pellet and the preparing procedures of th bath of electroless Ni-P plating were described in detail. The effects of the pH value of the bath on the coating quality, of the plating temperature on the yield of the coated microsperes and the plating rate, and of the plating time and the content of the complexing agent on the yield of the coated microsperes were investigated. The morphologies of the coating of the microsperes were evaluated by Olympus-BX51 optical microscopy(OM) and the coating thicknesses were measured by Scanning Electron Microscopy (SEM).

scholarly journals The technology of preparing green coating by conducting micro-arc oxidation on AZ91D magnesium alloy

2016 ◽  
Vol 18 (4) ◽  
pp. 36-40 ◽  
Author(s):  
Sheng Wang ◽  
Pengcheng Liu
Keyword(s):  
Electron Microscopy ◽  
Magnesium Alloy ◽  
X Ray Diffraction ◽  
Compact Layer ◽  
Silicate System ◽  
X Ray ◽  
Az91d Magnesium Alloy ◽  
The Matrix ◽  
Micro Arc Oxidation ◽  
Scanning Electron

Abstract Micro-arc oxidation was applied to AZ91D magnesium alloy by taking K2Cr2O7 as the colouring salt in the silicate system. It was shown that the green coating obtained through performing micro-arc oxidation on magnesium alloy consisted of Mg, Mg2SiO4, MgO, and MgCr2O4 based on analysis of X-ray diffraction (XRD), and scanning electron microscopy (SEM). Among which, MgCr2O4 was the colouring salt; there were something in the lamellar, pit, and convex forms found on the surface of the coating. The coating consisted of a porous, and a compact, layer from the outside to the inside. As demonstrated, the colour of the coating depended on the K2Cr2O7 concentration: it became gradually deeper with the addition of K2Cr2O7 and the increasing micro-arc oxidation time. The corrosion resistance and hardness of the green coating were greater than that of the matrix.

Study of the Correlation between Microstructure and Corrosion Resistance of the AZ91D Magnesium Alloy

2018 ◽  
Vol 930 ◽  
pp. 405-410 ◽  
Author(s):  
Renato Altobelli Antunes ◽  
Mara Cristina Lopes de Oliveira ◽  
Lucas Costa de Castro Ferraz ◽  
Letícia dos Reis Gonçales ◽  
Olandir Vercino Correa
Keyword(s):  
Electron Microscopy ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Volume Fraction ◽  
Beta Phase ◽  
Alpha Phase ◽  
Solution Annealing ◽  
Az91d Magnesium Alloy ◽  
Phase Solution ◽  
Scanning Electron

The aim of the present work was to study the influence of beta phase precipitates content and distribution on the corrosion behavior of the AZ91D magnesium alloy, using samples subjected to solution annealing and aging. The morphology of the beta phase was observed using optical microscopy and scanning electron microscopy. The volume fraction of each phase was also determined. Potentiodynamic polarization tests and immersion tests were carried out, indicating an increase of the corrosion resistance with the volume fraction of the beta phase and its distribution on the grain boundaries of the alpha-phase. Solution annealed samples were more susceptible to corrosion.

Synthesis of Single-Phase Nanocrystalline YIG by Co-Precipitation: The Influence of pH Value of Precursor Solution and Calcinating

2011 ◽  
Vol 311-313 ◽  
pp. 1294-1299 ◽  
Author(s):  
Liang Zheng ◽  
Hui Zheng ◽  
Jiang Xia Deng ◽  
Zhi Hua Ying ◽  
Jun Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Grain Size ◽  
Single Phase ◽  
Ph Value ◽  
Precursor Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Precipitation ◽  
Influence Of Ph ◽  
Scanning Electron

Single-phase nanocrystalline YIG powders have been successfully synthesized through chemical co-precipitation methods. The influence of pH value of the precursor solution and calcinating conditions (temperatures ranging from 700 to 900°C and times ranging from 0.5 to 12 hours) on the purity and grain size of the single-phase nanocrystalline YIG powders were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) technique. The results show that a pure single-phase YIG powder was obtained as the pH value of precursor solution above 10 and the YIG grain grows bigger as calcinating temperature and time increased. Finally, the optimal condition to form single-phase nanocrystalline YIG with the smallest grain size is calcinating at 750°C for 7 hours.

Zn Coatings on AZ91D Magnesium Alloy Prepared by Electroplating from the Electrolyte Containing SnO2 sol

2007 ◽  
Vol 546-549 ◽  
pp. 593-596 ◽  
Author(s):  
Wei Ping Li ◽  
Li Qun Zhu ◽  
Meng Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnesium Alloy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Az91d Magnesium Alloy ◽  
Phase Structures ◽  
Energy Dispersion Spectrometry ◽  
Solution Changes ◽  
Scanning Electron

A new method has been devised to obtain a Zn coating on the AZ91D magnesium alloy from the base electrolyte of ZnSO4 and K4P2O7 by electroplating. To improve the properties of the coating, a SnO2 sol was prepared and added in the electrolyte. The effects of the SnO2 sol addition on the morphologies, compositions and phase structures of the plated coatings were investigated by scanning electron microscopy (SEM), energy dispersion spectrometry (EDS) and X-ray diffraction (XRD). The results reveal that the addition of SnO2 in the solution changes the polarization behavior of the electrolyte and the compositions of the plated coating. The plated coating formed in the electrolyte with an addition of SnO2 sol are more uniform and provide a better protection for the AZ91D substrate.

Preparation of Magnetic Polymer ICF Pellet by the Electroless Plating

2014 ◽  
Vol 875-877 ◽  
pp. 155-159
Author(s):  
Shao Bo Cui ◽  
Zhong Yuan Lu ◽  
Feng Wei He
Keyword(s):  
Electron Microscopy ◽  
Inertial Confinement Fusion ◽  
Ph Value ◽  
Complexing Agent ◽  
Inertial Confinement ◽  
Coating Quality ◽  
Confinement Fusion ◽  
Electroless Ni ◽  
Scanning Electron

The pretreating procedures on the inertial confinement fusion (ICF) pellet and the preparing procedures of th bath of electroless Ni-P plating were described in detail. The effects of the pH value of the bath on the coating quality, of the plating temperature on the yield of the coated microsperes and the plating rate, and of the plating time and the content of the complexing agent on the yield of the coated microsperes were investigated. The morphologies of the coating of the microsperes were evaluated by Olympus-BX51 optical microscopy (OM) and the coating thicknesses were measured by Scanning Electron Microscopy (SEM).

scholarly journals Hydrothermal Synthesis of Various Shape-Controlled Europium Hydroxides

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 529
Author(s):  
Hongjuan Zheng ◽  
Kongjun Zhu ◽  
Ayumu Onda ◽  
Kazumichi Yanagisawa
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ph Value ◽  
Hydrothermal Temperature ◽  
X Ray ◽  
Hydrothermal Reactions ◽  
Starting Solution ◽  
Initial Ph ◽  
Shape Controlled ◽  
Scanning Electron

Eu(OH)3 with various shape-controlled morphologies and size, such as plate, rod, tube, prism and nanoparticles was successfully synthesized through simple hydrothermal reactions. The products were characterized by XRD (X-Ray Powder Diffraction), FE-SEM (Field Emission- Scanning Electron Microscopy) and TG (Thermogravimetry). The influence of the initial pH value of the starting solution and reaction temperature on the crystalline phase and morphology of the hydrothermal products was investigated. A possible formation process to control morphologies and size of europium products by changing the hydrothermal temperature and initial pH value of the starting solution was proposed.

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