Mg17Al12 phase in magnesium alloy waste facilitating the Ni2+ reduction in nickel plating wastewater

2021 ◽  
Vol 403 ◽  
pp. 123556
Author(s):  
Yu-Chi Chang ◽  
Jun-Yen Uan
Keyword(s):  
Magnesium Alloy ◽  
Nickel Plating ◽  
Mg17al12 Phase ◽  
Plating Wastewater

Deposition mechanism of electroless nickel plating of composite coatings on magnesium alloy

2019 ◽  
Vol 207 ◽  
pp. 1299-1308 ◽  
Author(s):  
Wei Shang ◽  
Xiaoqiang Zhan ◽  
Yuqing Wen ◽  
Yuqing Li ◽  
Zhe Zhang ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Composite Coatings ◽  
Electroless Nickel ◽  
Electroless Nickel Plating ◽  
Nickel Plating ◽  
Deposition Mechanism

Effect on Electroless Nickel Coating on Magnesium Alloy by Nickel Electroless Plating Parameters

2011 ◽  
Vol 295-297 ◽  
pp. 1522-1525
Author(s):  
Xiao Min Wang ◽  
Jun Duo
Keyword(s):  
Magnesium Alloy ◽  
Process Parameters ◽  
Ph Value ◽  
Nickel Coating ◽  
Electroless Nickel ◽  
Molar Ratio ◽  
Electroless Nickel Plating ◽  
Nickel Plating ◽  
Optimum Conditions ◽  
Bath Stability

Electroless nickel plating on magnesium alloy was studied when NiSO4as the main salt in the solution. The influence of the composition of the solution and process parameters on the coating appearance, the plating rate and bath stability was studied too. As a result, the optimum conditions of electroless nickel are: The main salt and reducing agent molar ratio between 0.3 and 0.45, mixed complexion agents was used, temperature 90°C, pH value 6.5.

Electroless nickel plating on ZM6 (Mg–2.6Nd–0.6Zn–0.8Zr) magnesium alloy substrate

2010 ◽  
Vol 204 (21-22) ◽  
pp. 3629-3635 ◽  
Author(s):  
Yanrui Gao ◽  
Chuming Liu ◽  
Shengli Fu ◽  
Jing Jin ◽  
Xin Shu ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Electroless Nickel ◽  
Electroless Nickel Plating ◽  
Nickel Plating ◽  
Alloy Substrate

Damping Properties of AZ91D Magnesium Alloy with Y Addition

2012 ◽  
Vol 476-478 ◽  
pp. 3-10
Author(s):  
Hang Chen ◽  
Xuan Pu Dong ◽  
Xiao Qing Xiong ◽  
Rong Ma ◽  
Shu Qun Chen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Magnesium Alloy ◽  
Fine Particles ◽  
Mechanical Analysis ◽  
Damping Capacity ◽  
Dislocation Model ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Mg17al12 Phase ◽  
Increasing Temperature

The influence of Y on the microstructure and damping capacity of AZ91D based alloys was investigated by optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and dynamic mechanical analysis. The results show that, with increasing Y content, the grain size of α-Mg matrix decreases tremendously and the distribution of β-Mg17Al12 phase is transformed from discontinuous network to fine particles. Meanwhile, a needle-shaped Al4MgY phase mainly distributing at the grain boundaries is identified. The damping capacity of the studied alloys shows sustained enhancement with increasing temperature. As to the strain dependent damping capacity, with the increase of Y content, the damping value of AZ91D alloy decreases gradually before Y content reaches to 0.5wt.%, and fluctuates when Y addition is between 0.5wt.%~0.9wt.%. G-L dislocation model was employed to explain the effects of parameters on damping capacity of magnesium alloy.

Deposition Mechanism Study of a Novel Electroless Nickel Plating Technique on AZ91D Magnesium Alloy

2011 ◽  
Vol 393-395 ◽  
pp. 40-43
Author(s):  
Jian Gang Qian ◽  
Tian Zhao
Keyword(s):  
Magnesium Alloy ◽  
Electroless Nickel ◽  
Nickel Layer ◽  
High Catalytic Activity ◽  
Electroless Nickel Plating ◽  
Nickel Plating ◽  
Mechanism Study ◽  
Deposition Mechanism ◽  
Az91d Magnesium Alloy ◽  
Initial Deposition

A novel direct electroless nickel plating method was developed for the AZ91D magnesium alloy. The electroless nickel initial deposition morphology was analyzed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The initial deposition characteristics of the coating and the deposition mechanism of the nickel layer are discussed. The results show that after activation, an uneven scaly-activated membrane was formed on the AZ91D magnesium alloy surface. The weakest part of the activated membrane dissolved first, where small Ni particles deposited initially. These deposited Ni particles had high catalytic activity and they were involved in the catalytic reduction reaction of hypophosphite, from which P was precipitated. As the plating proceeded, the number of the deposited Ni particles gradually increased in a three-dimensional manner and the surface was gradually covered by the growing cellular particles. A compact pore-free nickel-plated film was finally formed.

Effect of High-Pressure Solution Temperature on Microstructure and Mechanical Properties of AZ61 Magnesium Alloy

2012 ◽  
Vol 580 ◽  
pp. 505-508 ◽  
Author(s):  
Yu Shan Li
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Magnesium Alloy ◽  
Atmospheric Temperature ◽  
Optical Microscope ◽  
Solution Temperature ◽  
Hardness Tester ◽  
Az61 Magnesium Alloy ◽  
Mg17al12 Phase ◽  
Different Temperatures

As-cast AZ61 magnesium alloy was treated by solution under a high-pressure of 3 Gpa at different temperatures, atmospheric temperature, 200, 400, 600, 800 and 1000 °C. The microstructure of the products was observed by optical microscope. The mechanical properties of the products were investigated by brinell hardness tester and tensile testing. The results show that increasing solution temperature promotes the dissolution into α-Mg matrix of β-Mg17Al12 phase of AZ61 alloy, especially for over 400 °C. With increasing solution temperature, the tensile strength and elongation percentage of AZ61 increase gradually, but the hardness decreases.

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