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

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 Na PO . Hyd...

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Bibliographic Details
Published inScientific reports Vol. 7; no. 1; p. 9061
Main Authors Kim, Seo-Young, Kim, Yu-Kyoung, Ryu, Moon-Hee, Bae, Tae-Sung, Lee, Min-Ho
Format Journal Article
LanguageEnglish
Published England Nature Publishing Group 22.08.2017
Nature Publishing Group UK
Nature Portfolio
Subjects
Amine oxidase (flavin-containing)
Biocompatibility
Biodegradability
Biological activity
Calcium phosphates
Corrosion
Corrosion resistance
Cytotoxicity
Edetic acid
Glycerol
Oxidation
Oxides
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Summary: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 Na PO . Hydrothermal treatment was performed in 0.1 M Ca-EDTA (C H CaN Na O ) 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 [Formula: see text] formed on the surface. During the hydrothermal treatment in Ca-EDTA solution, calcium phosphate and Mg(OH) were produced via a reaction between [Formula: see text] on the surface and Ca 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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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-017-08242-0