In situ growth process of Mg–Fe layered double hydroxide conversion film on MgCa alloy

Chen, Jun; Feng, Jianmei; Yan, Lei; Li, Huan; Xiong, Changqi; Ma, Shengqiang

doi:10.1016/j.jma.2020.05.019

Cited by 25 publications

(6 citation statements)

References 36 publications

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“…The pH affected the chemical composition of the reaction solution, and an appropriate pH was crucial to maintain the Mg 2+ and OHconcentrations and control the LDH formation. The composition of LDH was significantly related to the OHconcentration [39]. An unsuitable pH level led to the inhibition of the conversion of Mg substrate to Mg 2+ ions or the decline in Mg 2+ concentration through OH -; this limited the composition uniformity and compactness of the LDH coatings [39].…”

Section: Discussionmentioning

confidence: 99%

“…The composition of LDH was significantly related to the OHconcentration [39]. An unsuitable pH level led to the inhibition of the conversion of Mg substrate to Mg 2+ ions or the decline in Mg 2+ concentration through OH -; this limited the composition uniformity and compactness of the LDH coatings [39]. This was possibly why the pH preceded the reaction time, as shown in Table 3.…”

Section: Discussionmentioning

confidence: 99%

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The Effects of Reaction Parameters on the Corrosion Resistance of an Mg-Al Hydroxide Coating via in Situ Growth on a Biomedical Magnesium Alloy

et al. 2022

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An in situ Mg-Al hydrotalcite (LDH) film was prepared using a one-step hydrothermal method on the surface of a medical magnesium alloy. The importance and influence of the reaction parameters on the corrosion resistance of the LDH coatings were optimized and investigated through an orthogonal array and range analysis. The reaction parameters included the temperature, reaction time, pH, and concentration of the aluminum source. The relationship between the parameters and corrosion resistance performance of each coating was compared with the chemical composition, electrochemical corrosion current, and hydrogen evolution rate. Suitable reaction parameters were obtained. The morphology, element distribution, adhesion strength, and electrochemical properties of the preferred coatings were further analyzed and evaluated to optimize the treatment process. The results showed that temperature had the most significant impact on the quality of the LDH coating; a suitably high temperature, a longer reaction time, a higher aluminum source concentration, and a high pH were conducive to forming high-quality LDH coatings. There was an inverse relationship between the corrosion resistance and the LDH-to-Mg(OH)2 content ratio of the coatings. The optimal reaction parameters for this Mg-Al LDH coating on the substrate were 130 °C for 8 h at a pH of 13 using a 10 mM Al3+ solution.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The Effects of Reaction Parameters on the Corrosion Resistance of an Mg-Al Hydroxide Coating via in Situ Growth on a Biomedical Magnesium Alloy

et al. 2022

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“…Various efforts have been made to improve the casting process and consequently the mechanical properties of MgCa alloys [39]. However, no matter how much the process can be improved, it must be considered that the eutectic lamellar phases that originate will always be present in the incorporation of Ca to Mg. Homogenization due to improvements in the foundry offers to improve the biocompatibility [24,[115][116][117]; however, the characteristics of the morphologies reported indicate a strong inclination towards fragility.…”

Section: Discussionmentioning

confidence: 99%

Bio-Fabrication and Experimental Validation of an Mg - 25Ca - 5Zn Alloy Proposed for a Porous Metallic Scaffold

Becerra

Torres–Castro

2021

Crystals

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This paper proposes the bio-fabrication of a porous scaffold from a selection procedure of elements taking into account biological behavior, using magnesium (Mg) alloyed with calcium (Ca) and zinc (Zn). The proposed scaffold could work as a treatment for specific pathologies in trauma and oncology, on the one hand, in addition to possible applications in osteosynthesis, through contrib-uting to osseointegration and infection control through the release of drugs. Finally, another pos-sible attribute of this alloy could be its use as a complementary treatment for osteosarcoma; this is due to the basification produced by oxidative degradation (attack on cancer cells). The evaluation of cell viability of an alloy of Mg - 25 wt% Ca - 5 wt% Zn will strengthen current perspectives on the use of Mg in the clinical evaluation of various treatments in trauma and oncology. Considera-tions on the preparation of an alloy of Mg - 25 wt% Ca - 5 wt% Zn and its morphological charac-terization will help researchers understand its applicability for the development of new surgical techniques and lead to a deeper investigation of alternative treatments. However, it is very im-portant to bear in mind the mechanical effect of elements such as Ca and Zn on the degradation of the alloy matrix; the best alternative to predict the biological-mechanical potential starts with the selection of the essential-nutritional elements and their mechanical evaluation by mi-cro-indentation due to the fragility of the matrix. Therefore, the morphological evaluation of the specimens of Mg - 25 wt% Ca - 5 wt% Zn will show the crystallinity of the alloy; these results to-gether contribute to the design of biomedical alloys for use in treatments for various medical spe-cialties. The results indicated that cell viability is not affected, and there are no morphological changes in the cells.

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“…Due to their large surface area and their capability of carrying positive charges on the surface, they are used as adsorbents [49]. They have good biocompatibility and low toxicity [50], which make them possible candidates for biomedical applications. On the other hand, MgFe 2 O 4 is a brownish black spinel that belongs to the magnetite series.…”

Section: Degraded Powdersmentioning

confidence: 99%

Effect of Magnesium Addition and High Energy Processing on the Degradation Behavior of Iron Powder in Modified Hanks’ Solution for Bioabsorbable Implant Applications

Estrada

Multigner

Lieblich

et al. 2022

Metals

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This paper shows the results of applying a combination of high energy processing and magnesium (Mg) as an alloying element in a strategy for enhancing the degradation rate of iron (Fe) for applications in the field of non-permanent medical implants. For this purpose, Fe powder was milled with 5 wt% of Mg (Fe5Mg) and its microstructure and characterized degradation behavior. As-received Fe powder was also milled in order to distinguish between the effects due to high energy processing from those due to the presence of Mg. The powders were prepared by high energy planetary ball milling for 16 h. The results show that the initial crystallite size diminishes from >150 nm to 16 nm for Fe and 46 nm for Fe5Mg. Static degradation tests of loose powder particles were performed in Hanks’ solution. Visual inspection of the immersed powders and the X-ray diffraction (XRD) phase quantification indicate that Fe5Mg exhibited the highest degradation rate followed by milled Fe and as received Fe, in this order. The analysis of degradation products of Fe5Mg showed that they consist on magnesium ferrite and pyroaurite, which are known to present good biocompatibility and low toxicity. Differences in structural features and degradation behaviors of milled Fe and milled Fe5Mg suggest the effective dissolution of Mg in the Fe lattice. Based on the obtained results, it can be said that Fe5Mg powder would be a suitable candidate for non-permanent medical implants with a higher degradation rate than Fe.

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In situ growth process of Mg–Fe layered double hydroxide conversion film on MgCa alloy

Cited by 25 publications

References 36 publications

The Effects of Reaction Parameters on the Corrosion Resistance of an Mg-Al Hydroxide Coating via in Situ Growth on a Biomedical Magnesium Alloy

The Effects of Reaction Parameters on the Corrosion Resistance of an Mg-Al Hydroxide Coating via in Situ Growth on a Biomedical Magnesium Alloy

Bio-Fabrication and Experimental Validation of an Mg - 25Ca - 5Zn Alloy Proposed for a Porous Metallic Scaffold

Effect of Magnesium Addition and High Energy Processing on the Degradation Behavior of Iron Powder in Modified Hanks’ Solution for Bioabsorbable Implant Applications

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