Functionalization treatment of micro-arc oxidation coatings on magnesium alloys: a review

Lin, Zhensheng; Wang, Tianlin; Yu, Xiaoming; Sun, Xiaoting; Yang, Haw

doi:10.1016/j.jallcom.2021.160453

Cited by 120 publications

(39 citation statements)

References 117 publications

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“…Moreover, high temperatures (over 2000 °C) on the substrate surface can melt the coating and result in strong binding forces between the coating and substrate [ 17 , 18 ]. Numerous studies have treated Mg with PEO and investigated its orthopedic applications [ 19 , 20 ]. Rendenbach et al modified WE43 Mg alloy with PEO treatment and found that the PEO-treated Mg alloy showed enhanced corrosion resistance and osteointegration upon implantation in Gottingen miniature pigs [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Oxyhydroxide-Coated PEO–Treated Mg Alloy for Enhanced Corrosion Resistance and Bone Regeneration

Xie

Cheng

Zhou

et al. 2022

JFB

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Plasma electrolytic oxidation (PEO) is widely used as a surface modification method to enhance the corrosion resistance of Mg alloy, the most likely applied biodegradable material used in orthopedic implants. However, the pores and cracks easily formed on the PEO surface are unfavorable for long-term corrosion resistance. In this study, to solve this problem, we used simple immersion processes to construct Mn and Fe oxyhydroxide duplex layers on the PEO-treated AZ31 (PEO–Mn/Fe). As control groups, single Mn and Fe oxyhydroxide layers were also fabricated on PEO (denoted as PEO–Mn and PEO–Fe, respectively). PEO–Mn showed a similar porous morphology to the PEO sample. However, the PEO–Fe and PEO–Mn/Fe films completely sealed the pores on the PEO surfaces, and no cracks were observed even after the samples were immersed in water for 7 days. Compared with PEO, PEO–Mn, and PEO–Fe, PEO–Mn/Fe exhibited a significantly lower self-corrosion current, suggesting better corrosion resistance. In vitro C3H10T1/2 cell culture showed that PEO–Fe/Mn promoted the best cell growth, alkaline phosphatase activity, and bone-related gene expression. Furthermore, the rat femur implantation experiment showed that PEO–Fe/Mn–coated Mg showed the best bone regeneration and osteointegration abilities. Owing to enhanced corrosion resistance and osteogenesis, the PEO–Fe/Mn film on Mg alloy is promising for orthopedic applications.

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Section: Introductionmentioning

confidence: 99%

Oxyhydroxide-Coated PEO–Treated Mg Alloy for Enhanced Corrosion Resistance and Bone Regeneration

Xie

Cheng

Zhou

et al. 2022

JFB

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“…At first, high voltage causes the temperature to rise, an oxide film forms on the Mg alloy surface, and severe H 2 evolution can be observed. So, the voltage gradually increases at a slower rate; at weak points in the oxide film, it breaks, and the film thickness enhances [21,22,37]. The electrolyte diffuses into the discharge channels formed on the Mg substrate's surface due to the strong spark discharge [21,37].…”

Section: Polylactic Acid (Pla) Coated On Mg Alloymentioning

confidence: 99%

“…Metallic ions are released from the Mg alloy and drift away from the Mg alloy, and simultaneously, oxygen ions move in the inverse direction. Then, the oxide is formed on the Mg alloys' surface because of the reaction between oxygen ions and Mg ions, and a ceramic-like porous coating is formed on the Mg alloy [21,22,37].…”

Section: Polylactic Acid (Pla) Coated On Mg Alloymentioning

confidence: 99%

“…For increasing Mg alloys' corrosion resistance, researchers have focused on mechanical alloying, composite formation, and surface engineering [21]. Alloying and surface modification, such as polymer coating, electrochemical deposition, chemical conversion, and micro-arc oxidation (MAO), are two of the most common methods for improving magnesium properties [22]. Alloying is effective for optimizing the structures and characteristics of the materials as a whole but incurs a high cost [23].…”

Section: Introductionmentioning

confidence: 99%

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A Comprehensive Review on Surface Modifications of Biodegradable Magnesium-Based Implant Alloy: Polymer Coatings Opportunities and Challenges

et al. 2021

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The development of biodegradable implants is certainly intriguing, and magnesium and its alloys are considered significant among the various biodegradable materials. Nevertheless, the fast degradation, the generation of a significant amount of hydrogen gas, and the escalation in the pH value of the body solution are significant barriers to their use as an implant material. The appropriate approach is able to solve this issue, resulting in a decrease the rate of Mg degradation, which can be accomplished by alloying, surface adjustment, and mechanical treatment. Surface modification is a practical option because it not only improves corrosion resistance but also prepares a treated surface to improve bone regeneration and cell attachment. Metal coatings, ceramic coatings, and permanent polymers were shown to minimize degradation rates, but inflammation and foreign body responses were also suggested. In contrast to permanent materials, the bioabsorbable polymers normally show the desired biocompatibility. In order to improve the performance of drugs, they are generally encapsulated in biodegradable polymers. This study summarized the most recent advancements in manufacturing polymeric coatings on Mg alloys. The related corrosion resistance enhancement strategies and future potentials are discussed. Ultimately, the major challenges and difficulties are presented with aim of the development of polymer-coated Mg-based implant materials.

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“…Among these methods, MAO is of great interest because of the advantages of a simple process, no pollution, no need for vacuum or low-temperature conditions, etc. But its disadvantage is a high energy consumption [25].…”

Section: Introductionmentioning

confidence: 99%

Surface Treatment of Zn-Mn-Mg Alloys by Micro-Arc Oxidation in Silicate-Based Solutions with Different NaF Concentrations

Sun

et al. 2021

Materials

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Newly developed Zn-Mn-Mg alloys can be invoked as biomedical materials because of their excellent mechanical properties. However, the corrosion behavior of Zn-Mn-Mg alloys was still lacking in research. It had grown to be a hot research topic to improve the corrosion behavior of Zn alloys by surface treatment to meet the application of degradable Zn alloys in biomedical applications. Micro arc oxidation (MAO) is a simple and effective method to improve the corrosion behavior of the alloy. MAO coatings were successfully prepared on the surface of Zn-Mn-Mg alloys by MAO in silicate-based solutions with different NaF concentrations. The microstructure and phase composition of MAO coatings prepared on Zn-Mn-Mg alloys with different NaF concentrations in the electrolyte was examined by a scanning electron microscope and X-ray diffraction. The results showed that the MAO coatings are porous and mainly composed of ZnO. With the increasing NaF concentration in the electrolyte, the average thickness increases. The distribution of the micro/nanopores was uniform, and the pore size ranged from the submicron scale to several micrometers after MAO treatment in the electrolyte containing different concentrations of NaF. Potential dynamic polarization curves and electrochemical impedance spectroscopy were employed to assess the corrosion behavior of MAO coatings in Hank’s solution. The highest corrosion rate can be achieved after MAO treatment, with an electrolyte concentration of 1.5 g/L NaF in Hank’s solution. These results indicated that MAO coating can accelerate the corrosion resistance of a Zn-Mn-Mg alloy.

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Functionalization treatment of micro-arc oxidation coatings on magnesium alloys: a review

Cited by 120 publications

References 117 publications

Oxyhydroxide-Coated PEO–Treated Mg Alloy for Enhanced Corrosion Resistance and Bone Regeneration

Oxyhydroxide-Coated PEO–Treated Mg Alloy for Enhanced Corrosion Resistance and Bone Regeneration

A Comprehensive Review on Surface Modifications of Biodegradable Magnesium-Based Implant Alloy: Polymer Coatings Opportunities and Challenges

Surface Treatment of Zn-Mn-Mg Alloys by Micro-Arc Oxidation in Silicate-Based Solutions with Different NaF Concentrations

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