Characterization and corrosion properties of hydroxyapatite/graphene oxide bio-composite coating on magnesium alloy by one-step micro-arc oxidation method

A biodegradable hydroxyapatite/graphene oxide bio-composite (HA/GO) coating has been fabricated on magnesium (Mg) alloy by a convenient one-step method of micro-arc oxidation (MAO) for biodegradable implants. The microstructure and phase constituents of the obtained powders and coatings were charact...

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Bibliographic Details
Published in:Surface & coatings technology 2017-05, Vol.317, p.125-133
Main Authors: Wen, Cuilian, Zhan, Xiaozhang, Huang, Xiaogui, Xu, Feng, Luo, Lijin, Xia, Chengsen
Format: Article
Language:English
Subjects:
Alloys
Biocompatibility
Biodegradability
Biomedical materials
Coating effects
Corrosion currents
Corrosion resistance
Corrosion resistant alloys
Graphene
Hydroxyapatite
In vitro methods and tests
Magnesium
Magnesium base alloys
Microstructure
Oxidation
Protective coatings
Substrate inhibition
Surgical implants
X ray photoelectron spectroscopy
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Summary:A biodegradable hydroxyapatite/graphene oxide bio-composite (HA/GO) coating has been fabricated on magnesium (Mg) alloy by a convenient one-step method of micro-arc oxidation (MAO) for biodegradable implants. The microstructure and phase constituents of the obtained powders and coatings were characterized by XRD, SEM, TEM, FT-IR, XPS and the corrosion resistance in vitro has been investigated by electrochemical measurements in simulated body fluid (SBF). The results suggested that HA/GO powder has been successfully prepared and filled into the discharging pores of the coating during MAO process. The electrochemical measurements in SBF indicated that the corrosion current of Mg substrate has been significantly decreased by the HA/GO coating. Furthermore the EIS measurement suggested that the HA/GO coating more effectively inhibited the Mg substrate from corrosion compared to pure MAO coating. These results suggested that HA/GO coating on Mg alloy could be a promising candidate for biomedical application.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2017.03.034