In-vitro degradation behavior of Mg alloy coated by fluorine doped hydroxyapatite and calcium deficient hydroxyapatite

作     者：H.R.BAKHSHESHI-RAD E.HAMZAH M.DAROONPARVAR M.A.M.YAJID M.KASIRI-ASGARANI M.R.ABDUL-KADIR M.MEDRAJ 

作者机构：Department of Materials Manufacturing and Industrial Engineering Faculty of Mechanical EngineeringUniversiti Teknologi Malaysia Materials Engineering Department Najafabad Branch Islamic Azad University Najafabad Isfahan Iran Department of Mechanical Engineering Concordia University 1455 De Maisonneuve Blvd.West Montreal QC H3G 1M8 Canada 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2014年第24卷第8期

页      面：2516-2528页

核心收录：

学科分类：080503[工学-材料加工工程] 1003[医学-口腔医学] 1002[医学-临床医学] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：magnesium alloy fluorine-doped hydroxyapatite calcium deficient hydroxyapatite electrodeposition corrosion behavior 

摘      要：Fluorine-doped hydroxyapatite(FHA) and calcium deficient hydroxyapatite(CDHA) were coated on the surface biodegradable magnesium alloy using electrochemical deposition(ED) technique. Coating characterization was investigated X-ray diffraction(XRD), Fourier-transformed infrared spectroscopy(FTIR), transmission electron microscopy(TEM), scanni electron microscopy(SEM) and energy dispersive X-ray spectroscopy(EDS). The result shows that nano-FHA coated samp presents nano needle-like structure, which is oriented perpendicular to the surface of the substrate with denser and more unifo layers compared to the nano-CDHA coated sample. The nano-FHA coating shows smaller crystallite size(65 nm) compared to t nano-CDHA coating(95 nm); however, CDHA presents thicker layer(19 μm in thickness) compared to the nano-FHA(15 μm thickness). The corrosion behaviour determined by polarization, immersion and hydrogen evolution tests indicates that the nano-FH and nano-CDHA coatings significantly decrease corrosion rate and induce passivation. The nano-FHA and nano-CDHA coatings c accelerate the formation of bone-like apatite layer and significantly decrease the dissolution rate as compared to the uncoated M alloy. The nano-FHA coating provides effective protection to Mg alloy and presents the highest corrosion resistance. Therefore, t nano-FHA coating on Mg alloy is suggested as a great candidate for orthopaedic applications.