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Corrosion resistance and cytocompatibility of biodegradable surgical magnesium alloy coated with hydrogenated amorphous silicon
Author(s) -
Xin Yunchang,
Jiang Jiang,
Huo Kaifu,
Tang Guoyi,
Tian Xiubo,
Chu Paul K.
Publication year - 2008
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.32006
Subject(s) - materials science , corrosion , dielectric spectroscopy , coating , magnesium alloy , amorphous solid , sputter deposition , biocompatibility , silicon , alloy , chemical engineering , metallurgy , fourier transform infrared spectroscopy , amorphous silicon , magnesium , raman spectroscopy , simulated body fluid , composite material , electrochemistry , sputtering , thin film , nanotechnology , scanning electron microscope , crystalline silicon , organic chemistry , electrode , chemistry , optics , engineering , physics
The fast degradation rates in the physiological environment constitute the main limitation for the applications of surgical magnesium alloys as biodegradable hard‐tissue implants. In this work, a stable and dense hydrogenated amorphous silicon coating ( a ‐Si:H) with desirable bioactivity is deposited on AZ91 magnesium alloy using magnetron sputtering deposition. Raman spectroscopy and Fourier transform infrared spectroscopy reveal that the coating is mainly composed of hydrogenated amorphous silicon. The hardness of the coated alloy is enhanced significantly and the coating is quite hydrophilic as well. Potentiodynamic polarization results show that the corrosion resistance of the coated alloy is enhanced dramatically. In addition, the deterioration process of the coating in simulated body fluids is systematically investigated by open circuit potential evolution and electrochemical impedance spectroscopy. The cytocompatibility of the coated Mg is evaluated for the first time using hFOB1.19 cells and favorable biocompatibility is observed. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res, 2009