Micro‐arc oxidation of magnesium alloys: A review

Yao, Wenhui; Wu, Liang; Wang, Jingfeng; Jiang, Bin; Zhang, Dingfei; Serdechnova, Maria; Shulha, Tatsiana; Blawert, Carsten; Zheludkevich, Mikhail L.; Pan, Fusheng

doi:10.1016/j.jmst.2021.11.053

Cited by 135 publications

(30 citation statements)

References 174 publications

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“…The increase of the Na 2 SiO 3 concentration further reduced the stable working voltage. The main reason was that as the Na 2 SiO 3 concentration increased, the conductivity of electrolyte solution increased, and then reducing the stable working voltage at the later stage of the MAO process 11 …”

Section: Resultsmentioning

confidence: 99%

Effect of Na₂SiO₃ concentration on corrosion resistance and wear resistance of MAO ceramic film on the Al‐Mg‐Sc alloy

Jiang

2023

Int J Applied Ceramic Tech

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Although Al-Mg-Sc alloy was widely applied to aviation aerospace field, they were vulnerable to local corrosion and wear in the process of long-term service in severe environmental conditions. In this paper, micro-arc oxidation (MAO) ceramic films on Al-Mg-Sc alloy substrate were prepared in electrolyte solutions with different Na 2 SiO 3 concentrations, and the corrosion resistance and wear resistance of the MAO samples were studied. The experimental results of potentiodynamic polarization (PDS) and long-term immersion tests indicated that the MAO ceramic film prepared in 10 g/L Na 2 SiO 3 electrolyte solution had the best corrosion resistance, as manifested by no obvious cracks, serious collapse and corrosion products on the sample surface and no deep cracks and corrosion paths in the cross-sectional area. The increase of Na 2 SiO 3 concentration in electrolyte solution also improved the wear resistance of MAO ceramic film, as manifested by low wear depth (10 μm)and width (1 mm) of the MAO ceramic film prepared in 10 g/L Na 2 SiO 3 electrolyte solution against GCr15 steel ball. Studies in mechanisms suggested that as the Na 2 SiO 3 concentration in the electrolyte increased, the MAO ceramic film became denser, which could prevent the penetration of corrosive medium, promote the generation of the anti-wear layer with SiO 2 as the main component to enhance the wear resistance. MAO ceramic film formed in Na 2 SiO 3 electrolyte solution provided good protective performance for Al-Mg-Sc alloy in the corrosion and wear conditions, which had a broader application prospect.

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Section: Resultsmentioning

confidence: 99%

Effect of Na₂SiO₃ concentration on corrosion resistance and wear resistance of MAO ceramic film on the Al‐Mg‐Sc alloy

Jiang

2023

Int J Applied Ceramic Tech

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“…To reduce the corrosion rate of Mg, researchers have generated different Mg alloys or coatings. Anodization, as discussed previously, results in a highly adherent ceramic oxide coating [ 44 ] with sufficient wear and corrosion resistance, desirable electrical properties, and high thermal stability [ 17 , 18 , 19 , 45 ]. MAO coatings have been shown to slow degradation rates and reduce hydrogen evolution upon implantation in vivo [ 44 ].…”

Section: Discussionmentioning

confidence: 99%

“…PEO is a relatively inexpensive and environmentally friendly technique, especially when non-toxic elements are used. The resulting coatings from the PEO method possess sufficient wear and corrosion resistance as well as desirable electrical properties and high thermal stability [ 15 , 16 , 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Altering Magnesium Metal Surfaces on Degradation In Vitro and In Vivo during Peripheral Nerve Regeneration

et al. 2023

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In vivo use of biodegradable magnesium (Mg) metal can be plagued by too rapid a degradation rate that removes metal support before physiological function is repaired. To advance the use of Mg biomedical implants, the degradation rate may need to be adjusted. We previously demonstrated that pure Mg filaments used in a nerve repair scaffold were compatible with regenerating peripheral nerve tissues, reduced inflammation, and improved axonal numbers across a short—but not long—gap in sciatic nerves in rats. To determine if the repair of longer gaps would be improved by a slower Mg degradation rate, we tested, in vitro and in vivo, the effects of Mg filament polishing followed by anodization using plasma electrolytic oxidation (PEO) with non-toxic electrolytes. Polishing removed oxidation products from the surface of as-received (unpolished) filaments, exposed more Mg on the surface, produced a smoother surface, slowed in vitro Mg degradation over four weeks after immersion in a physiological solution, and improved attachment of cultured epithelial cells. In vivo, treated Mg filaments were used to repair longer (15 mm) injury gaps in adult rat sciatic nerves after placement inside hollow poly (caprolactone) nerve conduits. The addition of single Mg or control titanium filaments was compared to empty conduits (negative control) and isografts (nerves from donor rats, positive control). After six weeks in vivo, live animal imaging with micro computed tomography (micro-CT) showed that Mg metal degradation rates were slowed by polishing vs. as-received Mg, but not by anodization, which introduced greater variability. After 14 weeks in vivo, functional return was seen only with isograft controls. However, within Mg filament groups, the amount of axonal growth across the injury site was improved with slower Mg degradation rates. Thus, anodization slowed degradation in vitro but not in vivo, and degradation rates do affect nerve regeneration.

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“…Use of Fresnel model has already upgraded RM from a merely complementary tool to a powerful nanoscale quantitative methodology for the investigation of surface films conversion, shown on Fe based substrates. We anticipate the expansion of this methodology to a wide range of metal systems (e.g., Mg alloys, [39,40] high entropy alloys, [4,41] multi-principal element alloys [3,42] etc.) where localized in-situ characterization is urgently needed.…”

Section: Prospects Of Rm Application In Corrosion Sciencementioning

confidence: 99%

Reflective microscopy for mechanistic insights in corrosion research

Shkirskiy

Kanoufi

2022

Preprint

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Reflective microscopy (RM) is a robust, label free optical imaging technique that allows fast operando measurements of structural changes on metal interfaces at nanoscale in a wide field. Based on the analysis of the reflected light, RM can be simply understood as “video camera” to produce optical photographs of studied interfaces and thus, it has been used for many years as a complementary tool for the visual inspection. However, recent developments in the optical models and refining the experimental design provided means for the quantitative conversion of reflected light intensities into the variations in roughness, thickness of surface films, chemical composition etc., all indispensable for the surface sciences. This review highlights recent advances and contemporary challenges in the methodological developments of RM specifically tailored for the corrosion research.

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Micro‐arc oxidation of magnesium alloys: A review

Cited by 135 publications

References 174 publications

Effect of Na₂SiO₃ concentration on corrosion resistance and wear resistance of MAO ceramic film on the Al‐Mg‐Sc alloy

Effect of Na₂SiO₃ concentration on corrosion resistance and wear resistance of MAO ceramic film on the Al‐Mg‐Sc alloy

Effects of Altering Magnesium Metal Surfaces on Degradation In Vitro and In Vivo during Peripheral Nerve Regeneration

Reflective microscopy for mechanistic insights in corrosion research

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Micro‐arc oxidation of magnesium alloys: A review

Cited by 135 publications

References 174 publications

Effect of Na2SiO3 concentration on corrosion resistance and wear resistance of MAO ceramic film on the Al‐Mg‐Sc alloy

Effect of Na2SiO3 concentration on corrosion resistance and wear resistance of MAO ceramic film on the Al‐Mg‐Sc alloy

Effects of Altering Magnesium Metal Surfaces on Degradation In Vitro and In Vivo during Peripheral Nerve Regeneration

Reflective microscopy for mechanistic insights in corrosion research

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Product

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Effect of Na₂SiO₃ concentration on corrosion resistance and wear resistance of MAO ceramic film on the Al‐Mg‐Sc alloy

Effect of Na₂SiO₃ concentration on corrosion resistance and wear resistance of MAO ceramic film on the Al‐Mg‐Sc alloy