Evaluation of biodegradability of surface treated AZ91 magnesium alloy in SBF solution

Gopi, D.; Bhalaji, P.R.; Ramya, S.; Kavitha, L.

doi:10.1016/j.jiec.2014.08.019

Cited by 30 publications

(11 citation statements)

References 29 publications

(27 reference statements)

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“…Fine white crystal deposits can be seen over the AHT surfaces (Figures b,e and 3b,e), which confirms the claim of layer formation made from XRD results. According to Sasikumar and Rajendran and Gopi et al, the crystals could be zincite formed from Mg and Mg(OH) 2 phases over the metal surface. The surfaces (Figures c,f and 3c,f) of the HHT alloys are characterized by cracked morphology, which may be due to dehydration process that took place during heat treatment .…”

Section: Resultsmentioning

confidence: 99%

Effect of surface treatment on the bioactivity and electrochemical behavior of magnesium alloys in simulated body fluid

Sasikumar¹,

Solomon

Olasunkanmi³

et al. 2017

Materials & Corrosion

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The effect of surface treatment using NaOH or H2O2 on the bioactivity and corrosion behavior of AZX310, AZ91D, AM50, and AZ31 Mg alloys in simulated body fluid (SBF) has been studied with the aid of surface morphological assessment, in vitro characterization, and electrochemical measurements. The influence of immersion time on the behavior of the treated alloys in SBF was also investigated. X‐ray diffraction (XRD) and scanning electron microscopy (SEM) analyses confirmed successful surface modification upon treatment of alloy surface with NaOH and H2O2. XRD and SEM analyses also revealed that surface modification enhances formation and growth of hydroxyapatite (HA). Formation of HA layer on the alloy surface was further confirmed by Fourier transform infrared spectroscopy analysis. In vitro immersion test reveals that pH of SBF solution containing treated alloys is lower than that containing untreated alloy. However, pH increases with immersion time. Results from weight loss and electrochemical measurements indicate that treated alloys possess higher corrosion resistance in SBF than the untreated ones. H2O2 treated alloys demonstrated greater corrosion resistance in SBF than NaOH treated alloys.

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Section: Resultsmentioning

confidence: 99%

Effect of surface treatment on the bioactivity and electrochemical behavior of magnesium alloys in simulated body fluid

Sasikumar¹,

Solomon

Olasunkanmi³

et al. 2017

Materials & Corrosion

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“…It has been reported that Ca-deficient HA can be improve the formation of the crystallized bonelike apatite in SBF 37 . Based on the results of various studies 38 – 40 , the corrosion behavior of magnesium alloy with the MAO coating and hydrothermal treatment was predicted as below. The reaction is schematized in Fig.…”

Section: Discussionmentioning

confidence: 99%

Corrosion resistance and bioactivity enhancement of MAO coated Mg alloy depending on the time of hydrothermal treatment in Ca-EDTA solution

Kim

Ryu

et al. 2017

Sci Rep

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In this study, a two-step surface treatment was developed to restrain the rapid primary degradation of a biodegradable Mg alloy and to improve their biocompatibility. Micro arc oxidation (MAO) coating was performed in alkaline electrolytes such as 1.0 M NaOH with 0.1 M glycerol and 0.1 M Na3PO4. Hydrothermal treatment was performed in 0.1 M Ca-EDTA (C10H12CaN2Na2O8) and 0.5 M NaOH solution at 90 °C for different times (6, 12, 24, and 48 h). The film morphology and chemical properties were evaluated by XRD and FE-SEM. The electrochemical and corrosion behaviors were examined in the simulated body fluid, and cytotoxicity was assessed using MC3T3-E1 cells. After MAO coating, an oxide layer containing formed on the surface. During the hydrothermal treatment in Ca-EDTA solution, calcium phosphate and Mg(OH)2 were produced via a reaction between on the surface and Ca2+ in solution. The layer with ceramics and oxides was grown on the surface with increasing hydrothermal treatment time, and improved the surface corrosion resistance. The 24 h hydrothermal-treated group showed the lowest immersion corrosion rate and high cell viability. Therefore, this treatment was the most favorable surface modification for improving the initial corrosion resistance and bioactivity of the biodegradable Mg alloy.

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“…Further, these metallic materials have demonstrated the release of toxic corrosion products and allergens. 20,21 Hence, if the corrosion resistance of Mg alloy implant is enhanced, its great potential as a metallic implant material for orthopaedic applications could be enjoyed. 13 Also, AZ91 Mg alloy has the advantage of degradation, and thus if corrosion rates are controlled the material would slowly degrade, thereby decreasing health risks, costs and scarring.…”

Section: Introductionmentioning

confidence: 99%

Ball flower like manganese, strontium substituted hydroxyapatite/cerium oxide dual coatings on the AZ91 Mg alloy with improved bioactive and corrosion resistance properties for implant applications

et al. 2015

Self Cite

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Bio-degradable metals and alloys have been suggested as revolutionary potential materials for bone-related treatment. Of these materials, the AZ91 magnesium alloy (AZ91 Mg alloy) emerges as an attractive candidate due to its non-toxicity and outstanding mechanical properties. Even though magnesium alloys are widely studied as orthopedic implants for bone replacement and bone regeneration, their undesirable rapid corrosion rate under physiological conditions has limited their actual clinical applications. Therefore, increasing the corrosion resistance of the AZ91 Mg alloy is one of the key issues to address for the development of bio-degradable implants. In this study, a cerium oxide (CeO 2 ) coating is developed on the AZ91 Mg alloy by electrodeposition with a view of minimizing its corrosion rate during the bone healing period. Further, to improve the clinical application of AZ91 Mg alloy, manganese (Mn) and strontium (Sr) substituted hydroxyapatite (Mn, Sr-HAP) coatings were developed on the CeO 2 coated AZ91 Mg alloy. Hence, this study reports on the development of a Mn, Sr-HAP/CeO 2 dual coating on the AZ91 Mg alloy to make it a suitable alternative material for orthopedic implants.

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Evaluation of biodegradability of surface treated AZ91 magnesium alloy in SBF solution

Cited by 30 publications

References 29 publications

Effect of surface treatment on the bioactivity and electrochemical behavior of magnesium alloys in simulated body fluid

Effect of surface treatment on the bioactivity and electrochemical behavior of magnesium alloys in simulated body fluid

Corrosion resistance and bioactivity enhancement of MAO coated Mg alloy depending on the time of hydrothermal treatment in Ca-EDTA solution

Ball flower like manganese, strontium substituted hydroxyapatite/cerium oxide dual coatings on the AZ91 Mg alloy with improved bioactive and corrosion resistance properties for implant applications

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