title: Corrosion resistance and cytocompatibility of biodegradable surgical magnesium alloy coated with hydrogenated amorphous silicon.
abstract: 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.
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, Kowloon, China.
authors.forename: Yunchang
authors.initials: Y
authors.lastname: Xin
authors.forename: Jiang
authors.initials: J
authors.lastname: Jiang
authors.forename: Kaifu
authors.initials: K
authors.lastname: Huo
authors.forename: Guoyi
authors.initials: G
authors.lastname: Tang
authors.forename: Xiubo
authors.initials: X
authors.lastname: Tian
authors.forename: Paul K
authors.initials: PK
authors.lastname: Chu
mesh_terms: D000497:Alloys / Q000494:pharmacology*; D001826:Body Fluids; D002460:Cell Line; D048430:Cell Shape / Q000187:drug effects; D020099:Coated Materials, Biocompatible / Q000737:chemistry / Q000494:pharmacology*; D003343:Corrosion; D017097:Electric Impedance; D004563:Electrochemistry; D006244:Hardness / Q000187:drug effects; D006801:Humans; D006865:Hydrogenation / Q000187:drug effects; D007477:Ions; D008274:Magnesium / Q000494:pharmacology*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D011199:Potentiometry; D012825:Silicon / Q000494:pharmacology*; D017550:Spectroscopy, Fourier Transform Infrared; D013057:Spectrum Analysis; D013059:Spectrum Analysis, Raman; D013525:Surgical Instruments; D014867:Water
chemical_list: D000497:Alloys; D020099:Coated Materials, Biocompatible; D007477:Ions; D014867:Water; D008274:Magnesium; D012825:Silicon