Controlling the degradation rate of bioactive magnesium implants by electrophoretic deposition of akermanite coating

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• 作者：Mehdi Razavi ; Mohammadhossein Fathi ; Omid Savabi ; Seyed Mohammad Razavi ; Batoul Hashemi Beni ; Daryoosh Vashaee ; Lobat Tayebi
• 关键词：D ; Glass ceramics ; Akermanite coating ; Magnesium alloys ; Electrophoretic deposition ; Degradable implants
• 刊名：Ceramics International
• 出版年：April, 2014
• 年：2014
• 卷：40
• 期：3
• 页码：3865-3872
• 全文大小：1601 K

文摘

In order to improve the corrosion resistance and the surface bioactivity of biodegradable magnesium alloys, a nanostructured akermanite (Ca₂MgSi₂O₇) coating was grown on AZ91 magnesium alloy through electrophoretic deposition (EPD) assisted with micro arc oxidation (MAO) method. The crystalline structures, morphologies and compositions of samples were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The in vitro bio-corrosion (biodegradability) and bioactivity behaviors of samples were investigated by electrochemical and immersion tests. The experimental results indicated that the nanostructured akermanite coating could slow down the corrosion rate and improve the in vitro bioactivity of biodegradable magnesium alloy. Thus, magnesium alloy coated with nanostructured akermanite may be a promising candidate to be used as biodegradable bone implants.