Preparation and Corrosion Resistance of Microarc Oxidation-Coated Biomedical Mg–Zn–Ca Alloy in the Silicon–Phosphorus-Mixed Electrolyte

Wang, Yansong; Chen, Minfang; Zhao, Yun

doi:10.1021/acsomega.9b01998

Cited by 25 publications

(8 citation statements)

References 64 publications

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“…It is also important to study the coating adhesion. The micro-arc oxidation (MAO) process can provide the strong bonding of the bioactive ceramic coating (e,g, CaP) to the Mg substrate, which produces dense and porous structures [ [309] , [310] , [311] , [312] ]. This strong bonding is also beneficial for the attachment of a polymeric matrix loaded with growth factors, simvastatin, and zoledronate.…”

Section: Prospects and Challenges Of Bioactive Coating Systems For Absorbable Magnesium Bone Implantsmentioning

confidence: 99%

Potential bioactive coating system for high-performance absorbable magnesium bone implants

Sarian

Iqbal

Sotoudehbagha

et al. 2022

Bioactive Materials

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Magnesium alloys are considered the most suitable absorbable metals for bone fracture fixation implants. The main challenge in absorbable magnesium alloys is their high corrosion/degradation rate that needs to be controlled. Various coatings have been applied to magnesium alloys to slow down their corrosion rates to match their corrosion rate to the regeneration rate of the bone fracture. In this review, a bioactive coating is proposed to slow down the corrosion rate of magnesium alloys and accelerate the bone fracture healing process. The main aim of the bioactive coatings is to enhance the direct attachment of living tissues and thereby facilitate osteoconduction. Hydroxyapatite, collagen type I, recombinant human bone morphogenetic proteins 2, simvastatin, zoledronate, and strontium are six bioactive agents that show high potential for developing a bioactive coating system for high-performance absorbable magnesium bone implants. In addition to coating, the substrate itself can be made bioactive by alloying magnesium with calcium, zinc, copper, and manganese that were found to promote bone regeneration.

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Section: Prospects and Challenges Of Bioactive Coating Systems For Absorbable Magnesium Bone Implantsmentioning

confidence: 99%

Potential bioactive coating system for high-performance absorbable magnesium bone implants

Sarian

Iqbal

Sotoudehbagha

et al. 2022

Bioactive Materials

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“…As discussed above, that αphase due to its higher electropositive character has a higher tendency to form Mg 2+ ions during the PEO and co-anodization process, under the effects of both high electric field and high Joule heat [45]. Thus, higher concentrations of Mg 2+ around the α-phase offer more active sites for anodization layers and subsequent gaseous species release.…”

Section: Microstructruementioning

confidence: 94%

Tuning Corrosion Properties of the Bio-Inspired AZ-Series Mg Alloys Using Electrochemical Surface Treatment under Varying Experimental Regimes

et al. 2022

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Plasma electrolytic oxidation (PEO) is a preferable process applied to optimize the corrosion and wear properties of metals and their alloys, particularly magnesium (Mg) alloys used in highly demanded medical and aerospace applications. In this project, AZ series alloys (AZ31, AZ61, AZ91), which are the major commercial magnesium alloys, were coated using the PEO process under varying experimental conditions involving electrolyte with Si based ionic chemical networks together with hydroxyl and fluoride functionalities. Surface analysis was carried out using scanning electron microscopy (SEM). Data were further simulated and analyzed using imageJ software. SEM results showed that, increasing the concentration of Al as in AZ91 and AZ61, dendrites-dominated the microstructure at shorter processing times; a cratered-dendritic matrix was obtained at longer processing time. From the composition analysis, fluoride complex peaks were obtained for the higher Al-content alloy (AZ91), due to the localized intensive discharges made regular by the stable β-phases within the Mg matrix. Corrosion analysis was carried out using potentiodynamic polarization. The compact structure, higher growth rate, and stable chemical phases of MgF2 contributed to the highest hardness values ~1271.2 HV and corrosion potential ~−0.18 V for the AZ91 alloy.

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“…Additionally, PEO electrolytes for Mg alloys often contain fluoride compounds for enhanced passivation of Mg. These could negatively affect the cell adhesion and proliferation [26,31]. Transparent Ca-P-based electrolytes have been recently proposed as a more chemically stable and user-friendly alternative and have been applied to Mg-Zn-Ca alloys.…”

Section: Introductionmentioning

confidence: 99%

Degradation Rate Control Issues of PEO-Coated Wrought Mg0.5Zn0.2Ca Alloy

Moreno,

Mohedano,

Arrabal

et al. 2024

Coatings

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Bioactive plasma electrolytic oxidation (PEO) coatings were developed on a wrought Mg0.5Zn0.2Ca alloy using a transparent electrolyte for easy maintenance and waste disposal, compared to a conventional suspension-based solution. Treatment times of 300, 600, and 900 s were evaluated for their effects on coating morphology, composition, and corrosion resistance. A short-time electrochemical impedance spectroscopy (EIS) screening was utilized to identify coatings with optimal corrosion protection. To assess the degradation rate and corrosion mechanisms, hydrogen evolution was monitored under pH-controlled quasi-in vivo conditions over extended immersion periods. Coating thickness increased by only 3% from 300 to 900 s of treatment (13 and 18 µm, respectively), with pore bands formed near the barrier layer at 900 s. The short-term EIS screening revealed that the coatings produced at 600 and 900 s were less protective and consistent than those at 300 s due to the presence of pore bands, which increased permeability. Hydrogen evolution measurements during 5 days of immersion at pH 7.4 indicated a tenfold higher degradation rate of the PEO-coated alloy compared to the bare substrate. Therefore, none of the PEO coatings provided effective corrosion protection after 24 h of immersion, which is attributed to crack formation at the PEO/corrosion products interface. This highlights the importance of crevices in the corrosion of Mg-Zn-Ca alloys. The presence of ZnO exacerbates the corrosion of magnesium in crevice areas.

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Preparation and Corrosion Resistance of Microarc Oxidation-Coated Biomedical Mg–Zn–Ca Alloy in the Silicon–Phosphorus-Mixed Electrolyte

Cited by 25 publications

References 64 publications

Potential bioactive coating system for high-performance absorbable magnesium bone implants

Potential bioactive coating system for high-performance absorbable magnesium bone implants

Tuning Corrosion Properties of the Bio-Inspired AZ-Series Mg Alloys Using Electrochemical Surface Treatment under Varying Experimental Regimes

Degradation Rate Control Issues of PEO-Coated Wrought Mg0.5Zn0.2Ca Alloy

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