In vitro corrosion resistance of a Ta2O5 nanofilm on MAO coated magnesium alloy AZ31 by atomic layer deposition

Li, Changyang; Yu, Chi; Zeng, Rong‐Chang; Zhang, Bo-Cheng; Cui, Lan-Yue; Wan, Jun; Xia, Yang

doi:10.1016/j.bioactmat.2019.12.001

Cited by 61 publications

(21 citation statements)

References 43 publications

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“…In terms of electrochemical activity, Ta has a lower reversible electrode potential and active position in the standard electrode potential series compared with Fe. However, because of the stable surface oxide layer of Ta, called a passive film, its corrosion potential is considerably shifted towards the positive direction, resulting in occupying the noble position in the galvanic pair with Fe [ [37] , [38] , [39] , [40] ]. As a result, when the nano Ta–Fe sample was in contact with aqueous environments, its nanostructured surface involved the formation of electrochemical nano-galvanic corrosion cells and became an excellent starting point for uniform surface degradation with no preferential sites.…”

Section: Discussionmentioning

confidence: 99%

Accelerated biodegradation of iron-based implants via tantalum-implanted surface nanostructures

Lee

Park

et al. 2022

Bioactive Materials

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In recent years, pure iron (Fe) has attracted significant attention as a promising biodegradable orthopedic implant material due to its excellent mechanical and biological properties. However, in physiological conditions, Fe has an extremely slow degradation rate with localized and irregular degradation, which is problematic for practical applications. In this study, we developed a novel combination of a nanostructured surface topography and galvanic reaction to achieve uniform and accelerated degradation of an Fe implant. The target-ion induced plasma sputtering (TIPS) technique was applied on the Fe implant to introduce biologically compatible and electrochemically noble tantalum (Ta) onto its surface and develop surface nano-galvanic couples. Electrochemical tests revealed that the uniformly distributed nano-galvanic corrosion cells of the TIPS-treated sample (nano Ta–Fe) led to relatively uniform and accelerated surface degradation compared to that of bare Fe. Furthermore, the mechanical properties of nano Ta–Fe remained almost constant during a long-term in vitro immersion test (~40 weeks). Biocompatibility was also assessed on surfaces of bare Fe and nano Ta–Fe using in vitro osteoblast responses through direct and indirect contact assays and an in vivo rabbit femur medullary cavity implantation model. The results revealed that nano Ta–Fe not only enhanced cell adhesion and spreading on its surface, but also exhibited no signs of cellular or tissue toxicity. These results demonstrate the immense potential of Ta-implanted surface nanostructures as an effective solution for the practical application of Fe-based orthopedic implants, ensuring long-term biosafety and clinical efficacy.

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Section: Discussionmentioning

confidence: 99%

Accelerated biodegradation of iron-based implants via tantalum-implanted surface nanostructures

Lee

Park

et al. 2022

Bioactive Materials

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“…Nevertheless, the above-mentioned literature lacks a comprehensive evaluation of the application prospects of TiO 2 -coated absorbable Mg alloy stents. Yang et al [ 86 ] reported the deposition of a TiO 2 film on Mg-Zn alloys via the ALD method (an advanced technology that adopts surface sequential reactions to achieve atomic-level film deposition and has the merits of improving the surface coverage and adhesion of the thin film [ 90 ]), the TiO 2 -150 °C nanoscale film protected Mg alloy from corrosion and promoted endothelial cells (ECs) adhesion and proliferation; however, the TiO 2 -200 °C thin film showed an unsatisfactory result in cell assays because of its unstable surface microstructure and lower than optimal surface energy, which did not match that of key proteins for mediating ECs attachment. Hou et al [ 91 ] successfully prepared a 400 nm-thick TiO 2 coating on Mg-Zn Alloy via a facile magnetron sputtering (MS) route at room temperature and evaluated the biocompatibility and corrosion resistance of the resulting material.…”

Section: Surface Modification Of Mg Alloy Stentsmentioning

confidence: 99%

Advances in coatings on magnesium alloys for cardiovascular stents – A review

Zhang

Yang

et al. 2021

Bioactive Materials

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109

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Magnesium (Mg) and its alloys, as potential biodegradable materials, have drawn wide attention in the cardiovascular stent field because of their appropriate mechanical properties and biocompatibility. Nevertheless, the occurrence of thrombosis, inflammation, and restenosis of implanted Mg alloy stents caused by their poor corrosion resistance and insufficient endothelialization restrains their anticipated clinical applications. Numerous surface treatment tactics have mainly striven to modify the Mg alloy for inhibiting its degradation rate and enduing it with biological functionality. This review focuses on highlighting and summarizing the latest research progress in functionalized coatings on Mg alloys for cardiovascular stents over the last decade, regarding preparation strategies for metal oxide, metal hydroxide, inorganic nonmetallic, polymer, and their composite coatings; and the performance of these strategies in regulating degradation behavior and biofunction. Potential research direction is also concisely discussed to help guide biological functionalized strategies and inspire further innovations. It is hoped that this review can give assistance to the surface modification of cardiovascular Mg-based stents and promote future advancements in this emerging research field.

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“…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. Moreover, the current density (I corr )of the composite coating decreased three orders of magnitude than that of the substrate and MAO coating, improving corrosion resistance.…”

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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In vitro corrosion resistance of a Ta2O5 nanofilm on MAO coated magnesium alloy AZ31 by atomic layer deposition

Cited by 61 publications

References 43 publications

Accelerated biodegradation of iron-based implants via tantalum-implanted surface nanostructures

Accelerated biodegradation of iron-based implants via tantalum-implanted surface nanostructures

Advances in coatings on magnesium alloys for cardiovascular stents – A review

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

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