Fluoride Conversion Coating on Biodegradable AZ31B Magnesium Alloy  

作　　者：Tingting Yan Lili Tan Bingchun Zhang Ke Yang 

机构地区：[1]Faculty of Materials Science and Engineering,Kunming University of Science and Technology [2]Institute of Metal Research,Chinese Academic of Sciences

出　　处：《Journal of Materials Science & Technology》2014年第7期666-674,共9页材料科学技术（英文版）

基　　金：the financial support of the National Basic Research Program of China(973 Program,No.2012CB619101);the Basic Application Research of Yunnan Province(No. KKSA201151053)

摘　　要：A fluoride conversion coating was successfully prepared on AZ31B magnesium alloy by chemical reaction in hydrofluoric acid. Morphologies, composition, bonding strength, corrosion properties, in vitro cytotoxicity and antibacterial properties of the coating were investigated, respectively. The scanning electron microscopy observations revealed a dense coating with some irregular pores. The thin-film X-ray diffraction analysis indicated that the coating was mainly composed of MgO and MgF2. The electrochemical impedance spectroscopy results showed that the fluoride conversion coating significantly improved the corrosion resistance of AZ31B. The hydroxyapatite formed on the surface of the fluoride coated AZ31 B after being immersed in the simulated blood plasma indicated the good bioactivity of the material. The in vitro cytotoxicity test showed that the fluoride coated AZ31B alloy was not toxic to BMMSCs （human bone marrow-derived mesenchymal stem cells）. It was also found that the fluoride coated AZ31 B alloy had antibacterial capability.A fluoride conversion coating was successfully prepared on AZ31B magnesium alloy by chemical reaction in hydrofluoric acid. Morphologies, composition, bonding strength, corrosion properties, in vitro cytotoxicity and antibacterial properties of the coating were investigated, respectively. The scanning electron microscopy observations revealed a dense coating with some irregular pores. The thin-film X-ray diffraction analysis indicated that the coating was mainly composed of MgO and MgF2. The electrochemical impedance spectroscopy results showed that the fluoride conversion coating significantly improved the corrosion resistance of AZ31B. The hydroxyapatite formed on the surface of the fluoride coated AZ31 B after being immersed in the simulated blood plasma indicated the good bioactivity of the material. The in vitro cytotoxicity test showed that the fluoride coated AZ31B alloy was not toxic to BMMSCs （human bone marrow-derived mesenchymal stem cells）. It was also found that the fluoride coated AZ31 B alloy had antibacterial capability.

关 键 词：AZ31B magnesium Fluoride coating Corrosion resistance CYTOTOXICITY ANTIBACTERIAL 

分 类 号：TG146.22[一般工业技术—材料科学与工程]