Biodegradability of AZ31B Magnesium Alloy with a Permanganate Conversion Coating

2014 ◽  
Vol 707 ◽  
pp. 163-167
Author(s):  
Si Yu Wu ◽  
Qiang Guo Chen ◽  
Jing Jing Xu ◽  
Ting Ting Yan ◽  
Qing Hua Chen
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Property ◽  
Conversion Coating ◽  
Biodegradable Material ◽  
X Ray Diffraction ◽  
Energy Dispersion Spectroscopy ◽  
Alloy Matrix ◽  
Az31b Magnesium Alloy ◽  
X Ray ◽  
Micro Cracks

Magnesium alloy has been considered as a revolutionary biodegradable material, but the fast degradation limits its development. A permanganate conversion coating for AZ31B magnesium alloy prepared, in order to improve its anti-corrosion property. The morphology and composition of the coating were characterized with scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersion spectroscopy (EDS), which showed that the coating was 40-170μm in thickness, with net-like micro-cracks, and was tightly combined with AZ31B magnesium alloy matrix. The main compositions of the coating were Mg and a series of oxides of Mn. Observed by the tests of electrochemical and immersion,the corrosion resistance of AZ31B magnesium alloy can be improved significantly through the permanganate conversion treatment

Laser Cladding of Zr55Al10Ni5Cu30/SiC Amorphous Composite Coatings on AZ91D Magnesium Alloy for Improvement of Corrosion Resistance

2011 ◽  
Vol 179-180 ◽  
pp. 757-761 ◽  
Author(s):  
Kai Jin Huang ◽  
Hou Guang Liu ◽  
Chang Rong Zhou
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Corrosion Property ◽  
Nacl Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Good Corrosion Resistance ◽  
Az91d Magnesium Alloy

To improve the corrosion property of magnesium alloys, Zr-based amorphous composite coatings have been fabricated on AZ91D magnesium alloy by laser cladding using mixed powders Zr55Al10Ni5Cu30/SiC. The microstructure of the coating was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The corrosion resistance of the coatings was tested in 3.5wt.% NaCl solution. The results show that the coatings mainly consist of amorphous and different crystalline phases. The coatings compared with AZ91D magnesium alloy exhibit good corrosion resistance because of the presence of the amorphous phase in the coatings.

Preparation and Characterization of Permanganate Conversion Coating for Biodegradable AZ31B Magnesium Alloy

2013 ◽  
Vol 763 ◽  
pp. 147-150
Author(s):  
Ting Ting Yan ◽  
Qing Hua Chen ◽  
Zhou Jiang ◽  
Yu Zhen Wang
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Xrd Analysis ◽  
Corrosion Property ◽  
Conversion Coating ◽  
Electrochemical Test ◽  
Az31b Magnesium Alloy

A permanganate conversion coating was prepared on biodegradable AZ31B magnesium alloy to improve its anti-corrosion property. Morphology, composition and corrosion resistance of the coating were studied in this paper. The SEM research showed that the coating was approximately 10-12μm in thickness with net-like microcracks. The XRD analysis indicated that the coating was mainly composed of MgO, MnO and Mn2O3. Electrochemical test showed manganese conversion treatment could significant improve the corrosion resistance of AZ31B.

Novel Strontium Doped Zinc Calcium Phosphate Conversion Coating on AZ31 Magnesium Alloy for Biomedical Applications

2017 ◽  
Vol 34 ◽  
pp. 57-67 ◽  
Author(s):  
P. Amaravathy ◽  
T.S. Sampath Kumar
Keyword(s):  
Magnesium Alloy ◽  
Calcium Phosphate ◽  
Chemical Conversion ◽  
Conversion Coating ◽  
Az31 Magnesium Alloy ◽  
Degree Of Crystallinity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Simple Chemical ◽  
High Degree

A simple chemical conversion coating was adopted to deposit zinc calcium phosphate (ZCP) coating and strontium doped ZCP (SZCP) coating on AZ31 magnesium alloy to induce biocompatibility and reduce the degradation rate. The surface morphology, chemical composition and functional groups of the coating were characterized by Scanning Electron Microscopy with Energy Dispersive X-Ray Spectroscopy (SEM-EDS), X-Ray Diffraction (XRD) studies and Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) spectroscopy respectively. SZCP coating formed at 20 min deposition time produced crack free surface with a high degree of crystallinity with barrier property, which ultimately retards the dissolution of magnesium in Simulated Body Fluid (SBF). The corrosion resistance of AZ31 magnesium alloy was improved by SZCP coating as evident from hydrogen evolution test (HET). Cytotoxicity evaluation with L969 cells showed that Sr doped ZCP coatings showed less toxicity on resorbable magnesium alloys.

Laser Cladding of Mg65Cu25Y10/SiC Amorphous Composite Coatings on AZ91D Magnesium Alloy for Improvement of Corrosion Resistance

2010 ◽  
Vol 143-144 ◽  
pp. 758-762
Author(s):  
Kai Jin Huang ◽  
Hou Guang Liu ◽  
Chang Rong Zhou
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Corrosion Property ◽  
Nacl Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Good Corrosion Resistance ◽  
Az91d Magnesium Alloy

To improve the corrosion property of magnesium alloys, Mg-based amorphous composite coatings have been fabricated on AZ91D magnesium alloy by laser cladding using mixed powders Mg65Cu25Y10/SiC. The microstructure of the coating was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The corrosion resistance of the coatings was tested in 3.5wt.% NaCl solution. The results show that the coatings mainly consist of amorphous and different crystalline phases. The coatings compared to AZ91D magnesium alloy exhibit good corrosion resistance because of the presence of the amorphous phase in the coatings.

Room Temperature Screw Form Rolling of AZ91D Magnesium Alloy through Processing by Extrusion-Torsion Simultaneous Working

2014 ◽  
Vol 783-786 ◽  
pp. 375-379
Author(s):  
Mitsuaki Furui ◽  
Shouyou Sakashita ◽  
Kazuya Shimojima ◽  
Tetsuo Aida ◽  
Kiyoshi Terayama ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Room Temperature ◽  
Hardness Measurement ◽  
Rolling Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Az91d Magnesium Alloy ◽  
Microstructure Observation ◽  
Fine Grain ◽  
Simultaneous Processing

Extrusion-torsion simultaneous processing is a very attractive technique for fabricating a rod-shape material with fine grain and random texture. We have proposed a new screw form rolling process combined with preliminary extrusion-torsion simultaneous working. Microstructure evolution and mechanical property change of AZ91D magnesium alloy during extrusion-torsion simultaneous processing was examined through microstructure observation, X-ray diffraction analysis and micro-Vickers hardness measurement. By the addition of torsion, the crystal orientation of AZ91D magnesium alloy workpiece was drastically changed from basal crystalline orientation to the random orientation. Crystal grain occurred through the dynamic recrystallization and tended to coarsen with an increase of extrusion-torsion temperature. Grain refinement under 2 um was achieved at the lowest extrusion-torsion temperature of 523 K. M8 gauge AZ91D magnesium alloy screw was successfully formed at room temperature using the extrusion-twisted workpiece preliminary solution treating at 678 K for 345.6 ks. It was found that the extrusion-torsion temperature of 678 K must be selected to fabricate the good screw without any defects.

In vitro study on degradation of AZ31B magnesium alloy with fluoride conversion coating

2016 ◽  
Vol 32 (7) ◽  
pp. 409-414 ◽  
Author(s):  
Q. Li ◽  
P. Zhu ◽  
S. Chen ◽  
B. Zhang ◽  
K. Yang
Keyword(s):  
Magnesium Alloy ◽  
In Vitro Study ◽  
Conversion Coating ◽  
Vitro Study ◽  
Az31b Magnesium Alloy

scholarly journals Structure, Oxidation Resistance, Mechanical, and Tribological Properties of N- and C-Doped Ta-Zr-Si-B Hard Protective Coatings Obtained by Reactive D.C. Magnetron Sputtering of TaZrSiB Ceramic Cathode

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 946
Author(s):  
Ph. V. Kiryukhantsev-Korneev ◽  
A. D. Sytchenko ◽  
S. A. Vorotilo ◽  
V. V. Klechkovskaya ◽  
V. Yu. Lopatin ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Oxidation Resistance ◽  
Tribological Properties ◽  
Protective Coatings ◽  
Elastic Recovery ◽  
Protective Film ◽  
X Ray Diffraction ◽  
Energy Dispersion Spectroscopy ◽  
X Ray ◽  
Mechanical And Tribological Properties

Coatings in the Ta-Zr-Si-B-C-N system were produced by magnetron sputtering of a TaSi2-Ta3B4-(Ta,Zr)B2 ceramic target in the Ar medium and Ar-N2 and Ar-C2H4 gas mixtures. The structure and composition of coatings were studied using scanning electron microscopy, glow discharge optical emission spectroscopy, energy-dispersion spectroscopy, and X-ray diffraction. Mechanical and tribological properties of coatings were determined using nanoindentation and pin-on-disk tests using 100Cr6 and Al2O3 balls. The oxidation resistance of coatings was evaluated by microscopy and X-ray diffraction after annealing in air at temperatures up to 1200 °C. The reactively-deposited coatings containing from 30% to 40% nitrogen or carbon have the highest hardness up to 29 GPa and elastic recovery up to 78%. Additionally, coatings with a high carbon content demonstrated a low coefficient of friction of 0.2 and no visible signs of wear when tested against 100Cr6 ball. All coatings except for the non-reactive ones can resist oxidation up to a temperature of 1200 °C thanks to the formation of a protective film based on Ta2O5 and SiO2 on their surface. Coatings deposited in Ar-N2 and Ar-C2H4 demonstrated superior resistance to thermal cycling in conditions 20-T−20 °C (where T = 200–1000 °C). The present article compares the structure and properties of reactive and “standard-inert atmosphere” deposited coatings to develop recommendations for optimizing the composition.

Detection of Intermetallic Compounds in a Mg-5Al-3Ca-0.7Sr-0.2Mn Magnesium Alloy

2013 ◽  
Vol 197 ◽  
pp. 137-142 ◽  
Author(s):  
Tomasz Rzychoń ◽  
Janusz Szala ◽  
Tomasz Kukiełka
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnesium Alloy ◽  
Light Microscopy ◽  
Diffraction Analysis ◽  
Intermetallic Compounds ◽  
Intermetallic Phases ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

In this paper the results of microstructural investigations and methodology of detection of intermetallic compounds were reported. The microstructural investigations included the light microscopy, scanning electron microscopy, chemical microanalysis and X-ray diffraction analysis. It was found that the microstructure of Mg-5Al-3Ca-0.7Sr-0.2Mn alloy consists of α-Mg, (Mg,Al)2Ca, Al3Mg13(Sr,Ca), Mg2Ca and Al2Ca intermetallic phases. The correct detection of these phases requires the high magnifications and a large number of measurements fields.

Microstructure Effects on Corrosion Behavior of Mg-Zn-Zr-Nd ZM6 Magnesium Alloy

2012 ◽  
Vol 549 ◽  
pp. 695-698 ◽  
Author(s):  
Chang Jun Chen ◽  
Min Zhang ◽  
Qun Xing Fei
Keyword(s):  
Magnesium Alloy ◽  
Immersion Test ◽  
X Ray Diffraction ◽  
X Ray ◽  
Die Cast ◽  
Microstructure Effects ◽  
Lower Corrosion Rate ◽  
Xrd Patterns ◽  
Surface Examination

The effect of microconstituents on the corrosion and electrochemical behavior of Mg-Zn-Zr-Nd ZM6 magnesium alloy prepared by die-casting and ingot casting route has been investigated in 3.5Wt%NaCl solution.The experimental techniques used include long term immersion test and potentiodynamic polarization experiments. Surface examination and analytical studies were carried out using optical(OM) and scanning electron microscopy(SEM) and X-ray diffraction(XRD). Die-cast ZM6 magnesium alloy with smaller grain size offered marginally lower corrosion rate. In die-cast and ingot, corrosion attack took place preferentially on α-Mg phase. XRD patterns of non-corroded surface revealed α-Mg and Mg12Nd phases. The corrosion products for ZM6 ingot consisted of Mg(OH)2 together with α-Mg and Mg12Nd phases. The corrosion resistance of ingot is higher than diecast sample.

Grain Refinement of AZ91D Magnesium Alloy by In Situ Al4C3 Particles

2011 ◽  
Vol 306-307 ◽  
pp. 429-432
Author(s):  
Hui Han ◽  
Hua Ming Miao ◽  
Sheng Fa Liu ◽  
Yang Chen
Keyword(s):  
Magnesium Alloy ◽  
Grain Refinement ◽  
Synthesis Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Az91d Magnesium Alloy ◽  
Average Grain Size ◽  
Central Regions ◽  
Heterogeneous Nucleus

Experiments were conducted to fabricate the Al4C3 particles by powder in-situ synthesis process under argon atmosphere and examine the grain refinement of AZ91D magnesium alloy with the addition of 0.6%Al4C3(hereafter in mass fraction,%). By means of X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS), the results show the successful fabrication of Al4C3 particles. After adding 0.6%Al4C3, the average grain size of AZ91D magnesium alloy decreased from 360μm to 243μm. Based on the differential thermal analysis (DTA) results and calculations of the planar disregistry between Al4C3 and α-Mg, Al4C3 particles located in the central regions of magnesium grains can act as the heterogeneous nucleus of primary α-Mg phase.

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