Ca-P Conversion Coating on AZ60 Magnesium Alloy for Biomedical Application

• Published in: Chemical research in Chinese universities Vol. 30; no. 4; pp. 543 - 548
• Main Authors: Cheng, Zhongji, Lian, Jianshe, Hu, Xiaoli, Yang, Xiaohong, Li, Guangyu
• Format: Journal Article
• Language: English
• Published: Heidelberg Jilin University and The Editorial Department of Chemical Research in Chinese Universities 01.08.2014; Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering,Jilin University, Changchun 130022, P.R.China
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Inorganic Chemistry; NaCl溶液; Organic Chemistry; Physical Chemistry; 二水磷酸氢钙; 涂层沉积; 生物医学应用; 生物活性钙; 电化学阻抗谱; 转化膜; 镁合金; Deposited method; Corrosion rate; Ca-P coating; Magnesium alloy; Simulated body fluid(SBF)
• ISSN: 1005-9040; 2210-3171
• DOI: 10.1007/s40242-014-4082-2

To improve the anti-corrosion behaviors of magnesium alloy in the inner environment of human body,a bioactive Ca-P coating was deposited on the AZ60 magnesium alloy by a novel simple method.The morphologies of the Ca-P coatings formed under different treatment time were studied by scanning electron microscopy（SEM）.The corrosion behaviors of Ca-P coating were investigated by electrochemical polarization test and electrochemical impedance spectroscopy in both 3％（mass fraction） NaCl solution and simulated body fluid（SBF）.Immersion test in SBF was performed to evaluate the corrosion rate of Ca-P coated magnesium alloy.X-Ray diffraction（XRD） analysis result shows that the coating mentioned above mainly consists of dicalcium phosphate dehydrate（CaHPO4·2H2O,DCPD） and β-tricalcium phosphate dehydrate[β-TCP,Ca3（PO4）2],which exhibits good corrosion resistance.After magnesium alloy was immersed in 1 mol/L NaOH solution at 80 ℃ for 2 h,hydroxyapatite [Ca10（PO4）6（OH）2,HA]appeared on the magnesium alloy substrate,which can further decrease the corrosion rate of AZ60 magnesium alloy in SBF.