Fabrication and characterization of hydrophobic microarc oxidation/poly-lactic acid duplex coating on biodegradable Mg–Ca alloy for corrosion protection

Bakhsheshi‐Rad, Hamid Reza; Hamzah, Esah; Ebrahimi‐Kahrizsangi, Reza; Daroonparvar, Mohammadreza; Medraj, Mamoun

doi:10.1016/j.vacuum.2015.12.022

Cited by 65 publications

(26 citation statements)

References 21 publications

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“…The MAO coated samples were then dip‐coated to get a protective layer of polylactic acid. The electrochemical tests carried out in SBF exhibited improved corrosion resistance for dually coated samples as compared to noncoated and MAO coated samples …”

Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 96%

“…The AZ31 sample coated with HA for 400 V and 40 min exhibited the highest corrosion resistance . The properties of MAO‐treated surfaces can be enhanced with pretreatments, posttreatments, or if used with a combination of other coating methods . Corrosion resistance and bioactivity of Mg alloy AZ31 were improved by hydrothermally treating the MAO‐treated surface.…”

Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 99%

“…The MAO coated Mg surfaces are often further treated with different techniques including dip coating, the sol–gel method, hydrothermal treatment, and so forth to improve the surface properties . The results have shown that MAO coatings exhibit better adhesion when coupled with the above‐mentioned surface treatment techniques.…”

Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 99%

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The current trends of Mg alloys in biomedical applications—A review

2018

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Magnesium (Mg) has emerged as an ideal alternative to the permanent implant materials owing to its enhanced properties such as biodegradation, better mechanical strengths than polymeric biodegradable materials and biocompatibility. It has been under investigation as an implant material both in cardiovascular and orthopedic applications. The use of Mg as an implant material reduces the risk of long-term incompatible interaction of implant with tissues and eliminates the second surgical procedure to remove the implant, thus minimizes the complications. The hurdle in the extensive use of Mg implants is its fast degradation rate, which consequently reduces the mechanical strength to support the implant site. Alloy development, surface treatment, and design modification of implants are the routes that can lead to the improved corrosion resistance of Mg implants and extensive research is going on in all three directions. In this review, the recent trends in the alloying and surface treatment of Mg have been discussed in detail. Additionally, the recent progress in the use of computational models to analyze Mg bioimplants has been given special consideration.

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Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 96%

Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 99%

Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 99%

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The current trends of Mg alloys in biomedical applications—A review

2018

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“…Therefore, it is necessary to carry out post-processing, such as pore sealing, further for MAO-coated magnesium alloys to improve the corrosion performance and provide longer protection. Recently, composite coatings are extensively proposed to reduce the risk of the corrosion of magnesium alloys [ 24 , 25 , 26 ]. Li et al [ 27 ] deposited Ta 2 O 5 film on MAO coating by atomic layer deposition (ALD) technology, which effectively sealed the micropores and microcracks of the MAO coating.…”

Section: Introductionmentioning

confidence: 99%

Effect of GelMA Hydrogel Coatings on Corrosion Resistance and Biocompatibility of MAO-Coated Mg Alloys

Weng

et al. 2020

Materials

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Micro-arc oxidation (MAO) treatment is a simple and effective technique to improve the corrosion resistance for magnesium alloys. However, the presence of micro-pores and cracks on the coatings provides paths for corrosive ions to penetrate into and react with the substrate, limiting the long-term corrosion resistance. In this paper, we designed a composite coating with which GelMA hydrogel coatings with varying thicknesses were prepared on the surface of MAO-coated magnesium alloys via a dip-coating method, aiming to improve the biocorrosion resistance and biocompatibility. The surface morphology, the chemical composition of GelMA hydrogels, and the crystallographic structure of magnesium alloys were characterized by scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD), respectively. The corrosion resistance and biocompatibility of all samples were evaluated through electrochemical and biological experiments. The results demonstrated that the addition of GelMA hydrogel could effectively seal the pores and improve the corrosion resistance and biocompatibility of MAO-coated magnesium alloys, especially for the sample with one layer of GelMA hydrogel, showing high cell proliferation rate, and its current density (Icorr) was two orders of magnitude lower than that of the MAO coating. Besides, the balance mechanism between corrosion and protection was proposed. As a result, the GelMA hydrogel coatings are beneficial to the application of MAO-coated magnesium alloys in bone tissue engineering and other fields.

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“…MAO/PLA composite coatings with high adhesive strength and corrosion resistance can be an attractive option for the surface modification of Mg alloys in order to slow their degradation rate in SBF [36]. The study of Bakhsheshi-Rad [38] showed the feasibility of preparing a PLA layer on a microarc oxidation (MAO)-coated Mg-Ca alloy via a relatively simple method. The contact angle increases significantly from 42.30 • for the uncoated alloy to 95.30 • for the duplex coating as a result of composite coating.…”

Section: Polylactic Acid (Pla) Coated On Mg Alloymentioning

confidence: 99%

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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Fabrication and characterization of hydrophobic microarc oxidation/poly-lactic acid duplex coating on biodegradable Mg–Ca alloy for corrosion protection

Cited by 65 publications

References 21 publications

The current trends of Mg alloys in biomedical applications—A review

The current trends of Mg alloys in biomedical applications—A review

Effect of GelMA Hydrogel Coatings on Corrosion Resistance and Biocompatibility of MAO-Coated Mg Alloys

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

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