Effects of the Power Supply Mode and Loading Parameters on the Characteristics of Micro-Arc Oxidation Coatings on Magnesium Alloy

Yao, Jian-Tao; Wang, Sheng; Zhou, Yong; Dong, Hui

doi:10.3390/met10111452

Cited by 18 publications

(8 citation statements)

References 22 publications

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“…The morphology and chemical properties of MAO coating depend not only on the composition of electrolyte and properties of alloy, but also on processing parameters such as current density [35], voltage [36], heat treatment time [37], power supply mode, and loading parameters [38]. Generally, MAO coating on magnesium alloy consists of a porous outer layer and a thin barrier inner layer.…”

Section: Effect Of Micro-arc Oxidation On Biocompatibilitymentioning

confidence: 99%

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Review of the Effect of Surface Coating Modification on Magnesium Alloy Biocompatibility

Guo

Yuan

et al. 2022

Materials

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Magnesium alloy, as an absorbable and implantable biomaterial, has been greatly developed in the application field of biomaterials in recent years due to its excellent biocompatibility and biomechanics. However, due to the poor corrosion resistance of magnesium alloy in the physiological environment, the degradation rate will be unbalanced, which seriously affects the clinical use. There are two main ways to improve the corrosion resistance of magnesium alloy: one is by adding alloying elements, the other is by surface modification technology. Compared with adding alloy elements, the surface coating modification has the following advantages: (1) The surface coating modification is carried out without changing the matrix elements of magnesium alloy, avoiding the introduction of other elements; (2) The corrosion resistance of magnesium alloy can be improved by relatively simple physical, chemical, or electrochemical improvement. From the perspective of corrosion resistance and biocompatibility of biomedical magnesium alloy materials, this paper summarizes the application and characteristics of six different surface coating modifications in the biomedical magnesium alloy field, including chemical conversion method, micro-arc oxidation method, sol-gel method, electrophoretic deposition, hydrothermal method, and thermal spraying method. In the last section, it looks forward to the development prospect of surface coating modification and points out that preparing modified coatings on the implant surface combined with various modification post-treatment technologies is the main direction to improve biocompatibility and realize clinical functionalization.

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Section: Effect Of Micro-arc Oxidation On Biocompatibilitymentioning

confidence: 99%

“…as current density [35], voltage [36], heat treatment time [37], power supply mode, and loading parameters [38]. Generally, MAO coating on magnesium alloy consists of a porous outer layer and a thin barrier inner layer.…”

Section: Effect Of Micro-arc Oxidation On Biocompatibilitymentioning

confidence: 99%

Review of the Effect of Surface Coating Modification on Magnesium Alloy Biocompatibility

Guo

Yuan

et al. 2022

Materials

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“…The power increases with increases in the voltage resulting in greater reaction intensity. The input parameter increment enhances the formation of the uniform and dense coating [33].…”

Section: Formation Of the Metal Oxide Layermentioning

confidence: 99%

“…Hence, few samples were examined at the cross-section of the oxide layer to check the uniformity in the thickness. The experiments were conducted for more than 150 V as per the literature review reference [32,33]. Though literature used the AC voltage and current values, these values were taken as the base for DC values during experiments.…”

Section: Sem Analysismentioning

confidence: 99%

Development of an Oxide Layer on Al 6061 Using Plasma Arc Electrolytic Oxidation in Silicate-Based Electrolyte

et al. 2022

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The plasma electrolytic method is one of the techniques which can be used to form an oxide layer on the substrate material surface. This technique employs ion exchange by developing an electrolytic arc between the cathode and the anode. The strong bond at high temperatures promotes the formation of an oxide layer on the metal surface. The electrolyte composition has a strong influence on the metal surface characteristics. Hence, the addition of certain nanoparticles in an adequate amount can improve the surface properties like wear and corrosion resistance. In this study, a plasma electrolytic technique based on using a direct current and voltage approach is investigated. The plasma electrolytic technique is utilized to develop an oxide layer on the Al6061 alloy substrate surface using a DC voltage input on a silicate-based electrolyte. The substrate surface is then investigated for the thickness of the oxide layer formed and the amount of carbon element absorbed, using the SEM and XRD analysis. The experimentation and the study of the results confirmed the presence of a substantial oxide layer on the surface. The influence of the process on the output parameters-direct voltage and electrode distance is studied with the significant changes obtained in the weight percentage of elements like C, Al, Si, and O as supported by SEM and EDAX analysis. Most changes occurred when using a 197 V and in the current range of 0.3 A to 1 A. This can be useful further to improve the mechanical properties of the metal alloy using the plasma arc oxidation method.

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“…An increase in the duty cycle of the anode pulse will increase the pulse energy and spark discharge intensity on the film surface, which further enhances the grain size and surface roughness. A higher duty cycle increases the discharge energy, which induces the anatase phase transformation to form rutile [15]. Rapheal et al [16] and Wang et al [17] found that a higher anodal current density increases the film thickness and surface roughness, but decreases the microhardness.…”

Section: Introductionmentioning

confidence: 99%

Effects of Electrical Parameters on Micro-Arc Oxidation Coatings on Pure Titanium

Abbas,

Kung,

Lin

2023

Micromachines

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The micro-arc oxidation process was used to apply a ceramic oxide coating on a pure titanium substrate using calcium acetate and sodium dihydrogen phosphate as an electrolyte. The influence of the current frequency and duty ratio on the surface morphology, phase composition, wear behavior, and corrosion resistance were analyzed by employing a scanning electron microscope, X-ray diffractometer, ball-on-disk apparatus, and potentiodynamic polarization, respectively. Analyses of the surface and cross-sectional morphologies revealed that the MAO films prepared via a low current frequency (100 Hz) and a high duty ratio (60%) had a lower porosity and were more compact. The medium (500 Hz) and high (1000 Hz) frequencies at the higher duty ratios presented with better wear resistance. The highest film thickness (11.25 µm) was achieved at 100 Hz and a 20% duty ratio. A negligible current density was observed when the frequency was fixed at 500 Hz and 1000 Hz and the duty cycle was 20%.

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Effects of the Power Supply Mode and Loading Parameters on the Characteristics of Micro-Arc Oxidation Coatings on Magnesium Alloy

Cited by 18 publications

References 22 publications

Review of the Effect of Surface Coating Modification on Magnesium Alloy Biocompatibility

Review of the Effect of Surface Coating Modification on Magnesium Alloy Biocompatibility

Development of an Oxide Layer on Al 6061 Using Plasma Arc Electrolytic Oxidation in Silicate-Based Electrolyte

Effects of Electrical Parameters on Micro-Arc Oxidation Coatings on Pure Titanium

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