Research Progress on Surface Treatments of Biodegradable Mg Alloys: A Review

Wu, Weiwei; Wang, Ziyuan; Zang, Si-Tian; Yu, Xiaoming; Yang, Haw; Chang, Shijie

doi:10.1021/acsomega.9b03423

Cited by 34 publications

(19 citation statements)

References 50 publications

(74 reference statements)

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“…Therefore, it is necessary to control the degradation rate of magnesium alloys for realizing long-term implantation. At present, surface modifications are considered to be an effective way to improve the corrosion resistance of magnesium alloys [ 9 , 10 , 11 , 12 , 13 , 14 ]. Among all of the various surface modifications, the MAO coatings have been widely employed on Mg alloys due to its metallurgical adhesion to the substrate, good wear resistance, moderate corrosion resistance, and high hardness [ 15 , 16 , 17 , 18 , 19 ].…”

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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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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“…High corrosion rate of magnesium-based alloys in tissue environment may be limited, in addition to modifying the chemical composition, by surface treatment technologies. The degradation process can be controlled by way of coating the surface or changing its structure [53,60,61]. There are two methods of coating: conversion and deposition processes.…”

Section: Methods Of Reducing the Degradation Rate Of Magnesium Alloysmentioning

confidence: 99%

“…• Micro-arc oxidation (MAO) -is considered the most cost-effective technology in the production of protective coatings against corrosion on Mg-based alloys. Surface pores and cracks, which accelerate the corrosion rate, are a significant disadvantage of this technology [60,63].…”

Section: Methods Of Reducing the Degradation Rate Of Magnesium Alloysmentioning

confidence: 99%

“…On the other hand, this results in enrichment of the sample's surface with less active zinc. With the progress of degradation, zinc is oxidized and accumulates in the vicinity of disturbed chlorides, and therefore protects against further progression of degradation [60,61]. However, the protective layer is not dense enough to completely prevent degradation.…”

Section: Parameters Influencing the Course Of Magnesium Alloy Corrosimentioning

confidence: 99%

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Amorphous and Crystalline Magnesium Alloys for Biomedical Applications

Cesarz-Andraczke¹,

Kania²,

Młynarek³

et al. 2022

Magnesium Alloys Structure and Properties

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Amorphous and crystalline magnesium alloys, developed for medical applications – especially implantology – present the characteristics of biocompatible magnesium alloys (Mg-Zn, Mg-Zn-Ca, Mg-Ca etc.). This chapter provides a brief description of the role of magnesium in the human body and the use of Mg in medicine. It presents the concept of using magnesium alloys in medicine (advantages and limitations) and the scope of their potential applications (orthopedic implantology, cardiac surgery etc.). The chapter shows classification of magnesium alloys as potential biomaterials, due to their structure (amorphous, crystalline) and alloying elements (rare earth elements, noble metals etc.). The mechanism and in vitro degradation behavior of magnesium alloys with amorphous and crystalline structures are described. The chapter also discusses the influence of alloying elements (rare earth elements, noble metals) on the in vitro degradation process. It also presents the methods of reducing the degradation rate of magnesium alloys by modifying their surface (application of protective layers).

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“…Magnesium alloy has emerged as a potential biomaterial owing to its biodegradability, good mechanical strength, and biocompatibility. [1][2][3] The Young's modulus of Mg alloys is similar to that of bone, avoiding stress shielding effect, which occurs for other metallic implant materials with high Young's modulus. 4 Researchers reported that Mg metal may be qualified to serve as a suitable bone scaffold material to be used in tissue engineering.…”

Section: Introductionmentioning

confidence: 99%

Effect of pH of coating solution on the adhesion strength and corrosion resistance of hydroxyapatite and octacalcium phosphate coated WE43 alloy

et al. 2021

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Hydroxyapatite (HAp) and octacalcium phosphate (OCP) layers were formed on Mg- 4mass% Y- 3mass% rare earth (WE43) alloy by a chemical solution deposition method at various pH values of pH 5.5, 6.2, 7.5, and 8.6. Adhesion strength of HAp and OCP layers was evaluated before and after immersing in a medium for 14 days by a pull-off test. The corrosion resistance of these coatings was measured by polarization tests performed in a simulated body fluid (SBF). XRD analysis demonstrated that HAp coating layers were formed at pH 7.5 and 8.6, while OCP coating layers were formed at pH 5.5 and 6.2. Adhesion test results showed that the as-coated pH7.5-HAp layer had the highest adhesion strength of 8.6 MPa, which was attributed to the very dense structure of the coating layer. The as-coated pH8.6-HAp layer showed the adhesion strength of 6.5 MPa. The adhesion strength of the as-coated pH5.5- and pH6.2-OCP layers was 3.9 and 7.1 MPa, respectively, that was governed by the thick and fragile property of the layers. After immersing in the medium for 14 days, the adhesion strength of pH7.5- and pH8.6-specimens decreased to 5.8 and 5.6 MPa, respectively. The pitting corrosion and formation of Mg(OH)2 under the HAp layers were responsible for the decrease of adhesion strength. The polarization tests in SBF at 37 °C showed that the corrosion current density decreased with the HAp and OCP coatings, indicating the improvement of the corrosion resistance of WE43 alloy. The HAp coatings improved the corrosion resistance more efficiently than the OCP coatings.

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Research Progress on Surface Treatments of Biodegradable Mg Alloys: A Review

Cited by 34 publications

References 50 publications

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

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

Amorphous and Crystalline Magnesium Alloys for Biomedical Applications

Effect of pH of coating solution on the adhesion strength and corrosion resistance of hydroxyapatite and octacalcium phosphate coated WE43 alloy

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