Characterization of Wear and Corrosion Protective Coatings Formed on AZ91 Magnesium Alloy and SiCw/AZ91 Magnesium Matrix Composite by Microarc Oxidation

2005 ◽  
pp. 823-826
Author(s):  
Y.Q. Wang ◽  
Ming Yi Zheng ◽  
Kun Wu
Keyword(s):  
Magnesium Alloy ◽  
Matrix Composite ◽  
Protective Coatings ◽  
Microarc Oxidation ◽  
Magnesium Matrix Composite ◽  
Az91 Magnesium Alloy ◽  
Magnesium Matrix ◽  
Wear And Corrosion ◽  
Az91 Magnesium

Characterization of Wear and Corrosion Protective Coatings Formed on AZ91 Magnesium Alloy and SiCw/AZ91 Magnesium Matrix Composite by Microarc Oxidation

2005 ◽  
Vol 488-489 ◽  
pp. 823-826 ◽  
Author(s):  
Y.Q. Wang ◽  
Ming Yi Zheng ◽  
Kun Wu
Keyword(s):  
Corrosion Resistance ◽  
Matrix Composite ◽  
Protective Coatings ◽  
Energy Dispersive Spectrometer ◽  
Microarc Oxidation ◽  
Mg Alloy ◽  
Az91 Magnesium Alloy ◽  
Wear And Corrosion ◽  
Pin On Disc ◽  
Az91 Magnesium

The wear and corrosion protective coatings were synthesized on AZ91 Mg alloy and Mg matrix SiCw/AZ91 composite by a microarc oxidation (MAO) technique in an alkali-silicate electrolyte solution. The phase structure of the coatings was analyzed using X-ray diffraction (XRD). The tribological properties of the coatings sliding against GCr15 steel were investigated on a pin-on-disc friction and wear tester. The morphology and elemental composition of the worn coating surface were determined by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The potentiodynamic polarizing curves were measured to evaluate the corrosion resistance of the coatings. The results showed that the application of the coatings changed evolution tendency of friction coefficients and wear mechanism. For coated Mg alloy and Mg matrix composite, both the wear resistance and corrosion resistance were improved greatly.

X-Ray Microtomography for 3D Microstructure Characterization of Magnesium Matrix Composite Reinforced with Glassy Carbon Particles

2011 ◽  
Vol 176 ◽  
pp. 119-126 ◽  
Author(s):  
Agnieszka Botor-Probierz ◽  
Anita Olszówka-Myalska ◽  
Sam A. McDonald ◽  
Philip J. Withers
Keyword(s):  
Matrix Composite ◽  
Glassy Carbon ◽  
Volume Fraction ◽  
Sol Gel ◽  
Magnesium Matrix Composite ◽  
Magnesium Matrix ◽  
X Ray ◽  
Carbon Particles ◽  
Az91 Magnesium

The microstructure of novel AZ91 magnesium matrix composite reinforced with glassy carbon particles has been characterized in this study. The composite was produced by hot pressing a mixture of glassy carbon particles and metal powder. Beforehand, the particles were coated with SiO2 by a sol-gel method. Metris X-tek and Xradia MicroXCT laboratory X-ray tomography systems were used to obtain 3D microstructural information (particle-size distribution, volume fraction of particles, phase formation and defects in the form of clusters of particles and pores). These 3D features were validated by 2D scanning electron microscopy (SEM) methods.

Quantitative Characterization of Pore Arrangement in Pore Bands in Pressure Die Cast AZ91 Magnesium Alloy by Image Processing

2006 ◽  
Vol 514-516 ◽  
pp. 1477-1482 ◽  
Author(s):  
D. G. Leo Prakash ◽  
Doris Regener
Keyword(s):  
Image Processing ◽  
Magnesium Alloy ◽  
Programming Language ◽  
Az91 Magnesium Alloy ◽  
Quantitative Characterization ◽  
Processing Defect ◽  
Die Cast ◽  
Az91 Magnesium ◽  
Pore Arrangement

Microporosity is the major processing defect in pressure die cast AZ91 magnesium alloy. There is a big difference in the arrangement of pores in different regions of the castings. The present work explains the pore arrangement in pore bands and other regions. Quantification and characterization of pores in pore bands is expected to be useful to understand the process-propertymicrostructure correlation. A computational microstructural (image) analyzing technique has been developed by a programming language to quantify and analyze the micropores in pore bands. The pore band regions and the rest were separated and quantified. In addition, image analyzing technique was used to measure the clustering tendency of porosity in pore bands and it was compared with other regions.

Corrosion behavior of in situ (TiC-TiB2)p/AZ91 magnesium matrix composites in Harrison solution

2014 ◽  
Vol 61 (5) ◽  
pp. 319-327 ◽  
Author(s):  
Mohamed Gobara ◽  
Mohamed Shamekh
Keyword(s):  
Mechanical Properties ◽  
Corrosion Behavior ◽  
Matrix Composite ◽  
Electrochemical Impedance ◽  
Magnesium Matrix Composite ◽  
Magnesium Matrix ◽  
Content Type ◽  
X Ray ◽  
Az91 Magnesium

Purpose – This paper aims to study both the mechanical properties and the corrosion behavior of the synthesized in situ (TiC-TiB2) particulates/AZ91 magnesium matrix composite and compare the results with that of the conventional AZ91D alloy. Design/methodology/approach – Scanning electron microscope (SEM) equipped with energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) were used to study the surface morphology and crystalline structure. Mechanical compression tests were used to investigate the mechanical performance according to ASTM E9-89a. The corrosion behavior of the synthesized magnesium alloy was examined using both electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques in dilute Harrison solutions. Findings – The microstructure of the Mg composite showed a uniform distribution of reinforcing phases. Also, the reinforcing phases were formed without residual intermediate phases. The addition of titanium and boron carbides not only enhanced the mechanical properties of the matrix but also improve its corrosion behavior. Originality/value – This is the first time that magnesium matrix composite has been to synthesized with TiC and TiB2 particulates starting from starting from Ti and B carbides powder without adding aluminium using practical and low-cost technique (in situ reactive infiltration technique). This paper studies the corrosion behavior of synthesized Mg matrix in dilute Harrison solution and compares the results with that of conventional AZ91D.

Anti-corrosion microarc oxidation coatings on SiCP/AZ31 magnesium matrix composite

2009 ◽  
Vol 482 (1-2) ◽  
pp. 208-212 ◽  
Author(s):  
Wenbin Xue ◽  
Qian Jin ◽  
Qingzhen Zhu ◽  
Ming Hua ◽  
Yueyu Ma
Keyword(s):  
Matrix Composite ◽  
Microarc Oxidation ◽  
Magnesium Matrix Composite ◽  
Magnesium Matrix
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