scholarly journals Promising Methods for Corrosion Protection of Magnesium Alloys in the Case of Mg-Al, Mg-Mn-Ce and Mg-Zn-Zr: A Recent Progress Review

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1133
Author(s):  
Pavel Predko ◽  
Dragan Rajnovic ◽  
Maria Luisa Grilli ◽  
Bogdan O. Postolnyi ◽  
Vjaceslavs Zemcenkovs ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Corrosion Protection ◽  
Recent Progress ◽  
Protective Coatings ◽  
Chemical Reactivity ◽  
Short Review ◽  
Industrial Applications ◽  
Organic Polymer ◽  
Multilayer Systems ◽  
Specific Strength

High specific strength characteristics make magnesium alloys widely demanded in many industrial applications such as aviation, astronautics, military, automotive, bio-medicine, energy, etc. However, the high chemical reactivity of magnesium alloys significantly limits their applicability in aggressive environments. Therefore, the development of effective technology for corrosion protection is an urgent task to ensure the use of magnesium-containing structures in various fields of application. The present paper is aimed to provide a short review of recent achievements in corrosion protection of magnesium alloys, both surface treatments and coatings, with particular focus on Mg-Al-Mn-Ce, Mg-Al-Zn-Mn and Mg-Zn-Zr alloys, because of their wide application in the transport industry. Recent progress was made during the last decade in the development of protective coatings (metals, ceramics, organic/polymer, both single layers and multilayer systems) fabricated by different deposition techniques such as anodization, physical vapour deposition, laser processes and plasma electrolytic oxidation.

Recent progress in corrosion protection of magnesium alloys by organic coatings

2012 ◽  
Vol 73 (2-3) ◽  
pp. 129-141 ◽  
Author(s):  
Rong-Gang Hu ◽  
Su Zhang ◽  
Jun-Fu Bu ◽  
Chang-Jian Lin ◽  
Guang-Ling Song
Keyword(s):  
Magnesium Alloys ◽  
Corrosion Protection ◽  
Recent Progress ◽  
Organic Coatings

scholarly journals Analysis of Weak Zones in Friction Stir Welded Magnesium Alloys from the Viewpoint of Local Texture: A Short Review

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 970 ◽  
Author(s):  
Dejia Liu ◽  
Yanchuan Tang ◽  
Mingxue Shen ◽  
Yong Hu ◽  
Longzhi Zhao
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloys ◽  
Electron Backscatter Diffraction ◽  
Short Review ◽  
Industrial Applications ◽  
Mg Alloys ◽  
Butt Welding ◽  
Friction Stir ◽  
Future Challenges ◽  
Weak Zones

Friction stir welding (FSW) is a promising approach for the joining of magnesium alloys. Although many Mg alloys have been successfully joined by FSW, it is far from industrial applications due to the texture variation and low mechanical properties. This short review deals with the fundamental understanding of weak zones from the viewpoint of texture analysis in FSW Mg alloys, especially for butt welding. Firstly, a brief review of the microstructure and mechanical properties of FSW Mg alloys is presented. Secondly, microstructure and texture evolutions in weak zones are analyzed and discussed based on electron backscatter diffraction data and Schmid factors. Then, how to change the texture and strengthen the weak zones is also presented. Finally, the review concludes with some future challenges and research directions related to the texture in FSW Mg alloys. The purpose of the paper is to provide a basic understanding on the location of weak zones as well as the weak factors related to texture to improve the mechanical properties and promote the industrial applications of FSW Mg alloys.

A Brief Review about Surface Treatment of Magnesium Alloys

2012 ◽  
Vol 724 ◽  
pp. 307-310 ◽  
Author(s):  
Yu Bai ◽  
Fang Li Yu ◽  
Jun Du ◽  
Wen Xian Wang ◽  
Ze Qin Cui ◽  
...  
Keyword(s):  
Magnesium Alloys ◽  
Protective Coatings ◽  
Corrosion And Wear ◽  
New Materials ◽  
Paper Briefly ◽  
Effective Protection ◽  
Widespread Application ◽  
Specific Strength ◽  
Aerospace Applications ◽  
High Specific Strength

Due to the low density and high specific strength, magnesium and its alloys have been extensively used in the automobile and aerospace applications, where the weight reduction is critical. However, they are highly prone to corrosion, which has greatly limited their application in the automotive and aerospace industries. This paper briefly reviews the technologies for improving the corrosion and wear resistance of magnesium alloys and finds that the widespread application of magnesium alloys is still limited by the lack of proper protective coatings. Therefore, there is still a need to explore new materials and methods for the effective protection of magnesium and its alloys.

scholarly journals Microstructure and Thermomechanical Properties of Magnesium Alloys Castings

2012 ◽  
Vol 12 (2) ◽  
pp. 49-54 ◽  
Author(s):  
P. Lichý ◽  
M. Cagala
Keyword(s):  
Magnesium Alloys ◽  
Automobile Industry ◽  
Strength Properties ◽  
Industrial Applications ◽  
Thermomechanical Properties ◽  
Specific Strength ◽  
High Specific Strength ◽  
Industrial Manufacture ◽  
Fast Decrease ◽  
Engine Blocks

Microstructure and Thermomechanical Properties of Magnesium Alloys Castings Magnesium alloys thanks to their high specific strength have an extensive potential of the use in a number of industrial applications. The most important of them is the automobile industry in particular. Here it is possible to use this group of materials for great numbers of parts from elements in the car interior (steering wheels, seats, etc.), through exterior parts (wheels particularly of sporting models), up to driving (engine blocks) and gearbox mechanisms themselves. But the use of these alloys in the engine structure has its limitations as these parts are highly thermally stressed. But the commonly used magnesium alloys show rather fast decrease of strength properties with growing temperature of stressing them. This work is aimed at studying this properties both of alloys commonly used (of the Mg-Al-Zn, Mn type), and of that ones used in industrial manufacture in a limited extent (Mg-Al-Sr). These thermomechanical properties are further on complemented with the microstructure analysis with the aim of checking the metallurgical interventions (an effect of inoculation). From the studied materials the test castings were made from which the test bars for the tensile test were subsequently prepared. This test took place within the temperature range of 20°C - 300°C. Achieved results are summarized in the concluding part of the contribution.

scholarly journals High-performance fiber-shaped lithium-ion batteries

2020 ◽  
Vol 92 (5) ◽  
pp. 767-772
Author(s):  
Ye Zhang
Keyword(s):  
Lithium Ion Batteries ◽  
High Performance ◽  
Recent Progress ◽  
Lithium Ion ◽  
Short Review ◽  
Fiber Architecture ◽  
Hybrid Fiber ◽  
High Performance Fiber ◽  
Wearable Products ◽  
Lithium Air Batteries

AbstractThis short review summarizes our recent progress in fiber-shaped lithium-ion batteries and lithium-air batteries based on carbon nanotube hybrid fiber electrodes. The fiber architecture allows batteries to be deformable in all dimensions and bear various deformations such as bending, tying, twisting and even stretching. They are scaled up and further woven into breathable, flexible, stretchable and shape-memory textiles to effectively meet the requirements of modern electronics such as wearable products.

Controlled release and corrosion protection by self-assembled colloidal particles electrodeposited onto magnesium alloys

2015 ◽  
Vol 3 (8) ◽  
pp. 1667-1676 ◽  
Author(s):  
Jiadi Sun ◽  
Ye Zhu ◽  
Long Meng ◽  
Wei Wei ◽  
Yang Li ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Controlled Release ◽  
Magnesium Alloys ◽  
Corrosion Protection ◽  
Colloidal Particles ◽  
Self Assembled ◽  
Bioactive Agents

Self-assembled nanoparticles loaded with bioactive agents were electrodeposited to provide the magnesium alloy with controlled release and corrosion resistance properties.

scholarly journals The recent progress of neoadjuvant chemotherapy in triple negative breast cancer: A short review

2015 ◽  
Vol 5 (2) ◽  
Author(s):  
Michalis Liontos ◽  
Sophia Karageorgopoulou ◽  
Vasiliki Michalaki ◽  
John Contis ◽  
Evangelos Bournakis ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Neoadjuvant Chemotherapy ◽  
Triple Negative Breast Cancer ◽  
Recent Progress ◽  
Triple Negative ◽  
Short Review

Corrosion Protection and Microstructure of Magnesium Alloys Anodized by Phosphate Solution

2010 ◽  
Vol 638-642 ◽  
pp. 1464-1469
Author(s):  
Koji Murakami ◽  
Makoto Hino ◽  
Atsushi Saijo ◽  
Teruto Kanadani
Keyword(s):  
Sodium Chloride ◽  
Magnesium Oxide ◽  
Magnesium Alloys ◽  
Corrosion Protection ◽  
Corrosion Current ◽  
Electrochemical Analysis ◽  
The State ◽  
Phosphate Solution ◽  
Protective Films ◽  
Sacrificial Protection

Corrosion protection by anodization and conversion treatment in phosphate solution was studied by microstructural and electrochemical analysis. Both the anodized and the conversion-treated layers showed sacrificial protection in a solution of sodium chloride. The corrosion current or the dissolving rate of the anodized layer was smaller than that of the conversion-treated surface. The modified layers had another mode of protection to form protective films on magnesium substrate where the original modified layers were mechanically lost. Since the state of magnesium in the anodized layer is close to magnesium oxide, phosphorus in the layer is considered to have an important role in these properties concerning the above corrosion protection.

scholarly journals Evaluation of bio-coagulants for colour removal from dye synthetic wastewater: characterization, adsorption kinetics, and modelling approach

Water SA ◽  
2020 ◽  
Vol 46 (2 April) ◽  
Author(s):  
IA Obiora-Okafo ◽  
OD Onukwuli ◽  
NC Eli-Chukwu
Keyword(s):  
Adsorption Kinetics ◽  
Molecular Layer ◽  
Industrial Applications ◽  
Operating Conditions ◽  
Synthetic Wastewater ◽  
Organic Polymer ◽  
Good Prediction ◽  
Colour Removal ◽  
Separation Processes ◽  
Coagulant Dosage

Dye usage for industrial applications has been on the increase and these activities generate large amounts of dye-constituted wastewater that should be treated before environmental discharge or reuse. Various studies have shown the application of natural organic polymer (NOP) coagulants in dye removal from industrial wastewater. In this research, the coagulation performances of Vigna unguiculata (VU) and Telfairia occidentalis (TO) for colour removal from crystal Ponceau 6R dye synthetic wastewater was studied. The proximate compositions, structure, and surface morphologies of the coagulants were investigated using standard methods, i.e. Fourier-Transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM). Colour removal was evaluated through the time-dependent decrease in particle concentration and thus growth of flocs. Effects of the process parameters, including pH, coagulant dosage, dye concentration (DC), settling time, and temperature were preliminarily tested and the best range experimentally determined. The optimal operating conditions established were pH 2, 800 mg∙L−1 coagulant dosage, 100 mg∙L−1 dye concentration, 300 min, and 303 K. The order of greatest removal was VUC > TOC with optimum efficiency of 93.5% and 90.7%, respectively. The values of K and α obtained for VUC and TOC were 8.09 x 10−4 L∙mg−1∙min−1, 1.7 and 9.89 x 10-4 L∙mg−1∙min−1, 1.6, respectively. Coagulation time, Tag, calculated and deduced from the particle distribution plot, showed a rapid coagulation process. Coagulation-adsorption kinetics indicated agreement with the pseudo-second-order model deducing that chemisorption is the rate-controlling step. It further indicates that particle adsorption on the polymer surfaces occurred mostly as a mono-molecular layer and according to the chemisorption mechanism. Cross-validation showed good prediction of the experimental data. The selected coagulants have the potential for application as efficient coagulants while also showing significant adsorption characteristics. The application of kinetics and modelling in separation processes involving particle transfer is especially required in wastewater treatment.

scholarly journals Recent progress in the synthesis and selected applications of MCM-41: a short review

2006 ◽  
Vol 1 (3) ◽  
pp. 375-395 ◽  
Author(s):  
S. Bhattacharyya ◽  
G. Lelong ◽  
M.-L. Saboungi
Keyword(s):  
Recent Progress ◽  
Short Review ◽  
Mcm 41
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