LSP/MAO composite bio-coating on AZ80 magnesium alloy for biomedical application
LSP/MAO composite bio-coating on AZ80 magnesium alloy for biomedical application
复制标题
AZ80镁合金上LSP/MAO复合生物涂层的生物医学应用
DOI：
10.1016/j.msec.2017.03.003
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Hu Xiaxia
中科院分区：
文献类型：
--
作者：
Xiong Ying;Hu Qiang;Song Renguo;Hu Xiaxia
A composite bio-coating was fabricated on AZ80 magnesium (Mg) alloy by using micro-arc oxidation (MAO) under the pretreatment of laser shock peening (LSP) in order to improve the bio-corrosion resistance and the mechanical integrity. LSP treatment could induce grain refinement and compressive residual stress field on the surface of material. MAO bio-coating was grown in alkaline electrolyte with hydroxyapatite (HA, Ca10(PO4)6(OH)2) to improve the biological properties of the material. The microstructure, element and phase composition for untreated based material (BM) and treated samples (LSP layer, MAO bio-coating and LSP/MAO composite bio-coating) were investigated by transmission electron microscopy (TEM), scanning electron microscope (SEM), energy dispersion spectroscopy (EDS) and X-ray diffraction (XRD). Electrochemical tests and slow strain rate tensile (SSRT) tests were used to evaluate the corrosion resistance and the stress corrosion susceptibility in simulated body fluid (SBF). The results indicated that LSP/MAO composite bio-coating can not only improve the corrosion resistance of Mg alloy substrate evidently but also increase the mechanical properties in SBF compared to LSP layer and MAO bio-coating. Mg alloy treated by LSP/MAO composite technique should be better suited as biodegradable orthopedic implants.
