Mg(OH)2 Film on Micro-arc Oxidation Ceramic Coating of AZ31 Magnesium Alloy: Preparation and Corrosion Resistance

The purpose of this study was to improve the cellular compatibility and corrosion resistance of AZ31 magnesium alloy and to prepare a biodegradable medical material. An aminated hydroxyethyl cellulose (AHEC) coating was successfully prepared on the surface of a micro-arc oxide +AZ31 magnesium alloy by sol–gel spinning. The pores of the micro-arc oxide coating were sealed. A polarization potential test analysis showed that compared to the single micro-arc oxidation coating, the coating after sealing with AHEC significantly improved the corrosion resistance of the AZ31 magnesium alloy and reduced its degradation rate in simulated body fluid (SBF). The CCK-8 method and cell morphology experiments showed that the AHEC + MAO coating prepared on the AZ31 magnesium alloy had good cytocompatibility and bioactivity.

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Corrosion resistance property of the ceramic coating obtained through microarc oxidation on the AZ31 magnesium alloy surfaces

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2006.07.079 ◽

2007 ◽

Vol 201 (9-11) ◽

pp. 4905-4908 ◽

Cited By ~ 98

Author(s):

Fei Chen ◽

Hai Zhou ◽

Bin Yao ◽

Zhen Qin ◽

Qingfeng Zhang

Keyword(s):

Corrosion Resistance ◽

Magnesium Alloy ◽

Ceramic Coating ◽

Microarc Oxidation ◽

Az31 Magnesium Alloy ◽

Resistance Property ◽

Corrosion Resistance Property

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Influence of Current Density on Structure and Performance of Micro-Arc Oxidation Coatings on AZ31 Magnesium Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.189-193.562 ◽

2011 ◽

Vol 189-193 ◽

pp. 562-566 ◽

Cited By ~ 2

Author(s):

Mei Yang ◽

Zheng Lei ◽

Xiao Hong Wang ◽

Ping Wang ◽

Jun Yang

Keyword(s):

Corrosion Resistance ◽

Magnesium Alloy ◽

Current Density ◽

Adhesion Force ◽

Water Solution ◽

Corrosion Current ◽

Az31 Magnesium Alloy ◽

Positive Direction ◽

Micro Arc Oxidation ◽

And Performance

In the Na2SiO3-NaOH-C3H8O3electrolyte system,the micro-arc oxidation (MAO) coatings were prepared on AZ31 magnesium alloy when J=2A/dm2,4A/dm2,8A/dm2and 12A/dm2.The relations of current density with microstructure and performance of the MAO coatings on AZ31 were studied by means of SEM, XRD, HVS-1000 micro Vicker, MFT-4000 Scratch Tester and electro-chemical method. The results show that when current density increases,the thickness,growth rate,micro-hardness and the contents of MgO and Mg2SiO4of MAO coatings increase,but the adhesion force between MAO coating and substrate decreases, the millipores and the roughness become larger.The corrosion resistance of MAO coatings increases firstly and then decreases with the increasing current density.The corrosion resistance of MAO coating,which J=6 A/dm2,is the best in 4.5% NaCl water solution,whose corrosion current density reduces by 3 orders of magnitude, and corrosion potential increases 1078mV in positive direction.

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Performance of Ceramic Coating of MB3 Magnesium Alloy by Micro-Arc Oxidation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.571.38 ◽

2012 ◽

Vol 571 ◽

pp. 38-42

Author(s):

Shun Qi Zheng ◽

Li Ping Zhu ◽

Gui Ru Chang ◽

Chuang Lu ◽

Xiao Jing Li

Keyword(s):

Corrosion Resistance ◽

Magnesium Alloy ◽

Ceramic Coating ◽

Ceramic Coatings ◽

Drop Test ◽

Mg Alloy ◽

Oxidation Treatment ◽

Micro Arc Oxidation ◽

Dominant Phase

Micro-arc oxidation (MAO) method was used for the surface modification of MB3 magnesium alloy. The morphology feature, phase composition, and chemical composition of the formed ceramic coatings were studied by metallographic microscope, scanning electron microscopy (SEM), XRD, respectively. Drop test has been applied to study the corrosion resistance of MB3 Mg alloy with and without micro-arc oxidation treatment. The present result indicates that, through MAO, ceramic coatings were in-situ fabricated on the surface of MB3 Mg alloy, the micro-arc oxidation coating is relatively dense and uniform, maximum thickness is more than 97μm. The dominant phase of the coating is spinal Mg2SiO4 (Forsterite) and dissociative MgO (Periclase). Drop test shows that after oxidation the corrosion resistance of MB3 Mg alloy is greatly improved.

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FORMATION OF HA-CONTAINING COATING ON AZ31 MAGNESIUM ALLOY BY MICRO-ARC OXIDATION

Surface Review and Letters ◽

10.1142/s0218625x13500261 ◽

2013 ◽

Vol 20 (03n04) ◽

pp. 1350026 ◽

Cited By ~ 2

Author(s):

HUI TANG ◽

DEYU LI ◽

XIUPING CHEN ◽

CHAO WU ◽

FUPING WANG

Keyword(s):

Corrosion Resistance ◽

Magnesium Alloy ◽

Channel Model ◽

Optical Emission ◽

Biological Properties ◽

Az31 Magnesium Alloy ◽

Apatite Formation ◽

Biodegradable Implant ◽

Electrochemical Tests ◽

Micro Arc Oxidation

Magnesium and its alloys are potential biodegradable implant materials due to their attractive biological properties. But the use of magnesium is still hampered by its poor corrosion resistance in physiological fluids. In this study, a HA-containing coating was fabricated by micro-arc oxidation (MAO). The active plasma species of micro-discharge was studied by optical emission spectroscopy (OES). The microstructure and composition were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The corrosion behavior and apatite-forming ability were studied by electrochemical tests and immersed samples in simulated body fluids (SBF). The results show that the microdischarge channel model is gas discharges and oxide layer discharges. The elements from the substrate and electrolyte take part in the formation of the coating. The MAO coating significantly improves the corrosion resistance of AZ31 magnesium alloy and enhances the apatite formation ability.

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Development and assessment of a multifunctional chitosan-based coating applied on AZ31 magnesium alloy: Corrosion resistance and antibacterial performance against Klebsiella Pneumoniae

Journal of Magnesium and Alloys ◽

10.1016/j.jma.2021.03.033 ◽

2021 ◽

Author(s):

Emmanuel Mena-Morcillo ◽

Lucien Veleva ◽

Mariana Cerda-Zorrilla ◽

Montserrat Soria-Castro ◽

Juan C. Castro-Alcántara ◽

...

Keyword(s):

Corrosion Resistance ◽

Magnesium Alloy ◽

Klebsiella Pneumoniae ◽

Az31 Magnesium Alloy ◽

Antibacterial Performance

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A Preliminary Study of Anodization and Electroless Ni–P Plating on AZ80 Magnesium Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.299-300.663 ◽

2011 ◽

Vol 299-300 ◽

pp. 663-666 ◽

Cited By ~ 1

Author(s):

Ping Shi ◽

Xue Dong Han

Keyword(s):

Corrosion Resistance ◽

Magnesium Alloy ◽

Weight Ratio ◽

High Strength ◽

Surface Modifications ◽

Atomic Ratio ◽

Az80 Magnesium Alloy ◽

Micro Arc Oxidation ◽

Preliminary Study ◽

Electroless Ni

Magnesium alloys are being used as structural components in industry because of their high strength to weight ratio. But their high electrochemical activity and poor corrosion resistance limited their applications. Therefore, surface modifications are needed for protection purpose. This paper studied the anodic micro-arc oxidation and electroless Ni-P plating surface modifications on AZ80 magnesium alloy. The SEM, XRD and EDS were used to characterize the surface coating. It shows that a micro-porous MgO layer with the pores size 5 – 20 μm was fabricated on the bare magnesium alloy. The nodule Ni-P deposition could be prepared on the out layer of MgO with Ni/P atomic ratio being 1.4. The pores in MgO layer could be sealed by the following Ni-P deposition. Therefore the corrosion resistance of the magnesium alloy could be further improved.

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