Degradable behavior and bioactivity of micro-arc oxidized AZ91D Mg alloy with calcium phosphate/chitosan composite coating in m-SBF

作者：Zhang, Jie; Dai, Changsong^*; Wei, Jie; Wen, Zhaohui; Zhang, Shujuan; Chen, Chuang

来源：Colloids and Surfaces B: Biointerfaces , 2013, 111: 179-187.

DOI：10.1016/j.colsurfb.2013.05.040

• Mg alloy
• Chitosan
• Calcium phosphate coating
• Degradable behavior
• Bioactivity

The degradation behavior of a MAO-A2910 with a calcium phosphate/chitosan composite coating in the modified simulated human body fluid (m-SBF) was investigated by immersion experiments and electrochemical impedance spectroscopy. The compositions of the composite coating soaked in the m-SBF for different time intervals were studied by X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, thermo-gravimetric analysis and differential thermal analysis. The microstructures of the composite coating at different soaking stages were observed by using a scanning electron microscope. Results show that the as-prepared composite coating could slow down the corrosion rate of the AZ910 alloy and it demonstrated good bioactivity in the m-SBF. The coating's morphology changed from a flake-like one into a spherical-shaped one with the increase of immersion time in the m-SBF.

• 出版日期2013-11-1
• 单位哈尔滨工业大学; 佳木斯大学; 苏州科技大学; 哈尔滨医科大学