کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1572417 | 1000681 | 2010 | 8 صفحه PDF | دانلود رایگان |
In order to overcome the problem of the corrosion resistance of AZ31 magnesium alloy, the nanocrystalline Al2O3 film was deposited on AZ31 magnesium alloy by double cathode glow-discharge plasma technique. The microstructure, chemical composition and elemental chemical state of the sputter-deposited nanocrystalline Al2O3 film were analyzed by means of scanning electron microscopy equipped with an energy dispersive spectroscope, X-ray diffraction), transmission electron microscope and X-ray photoelectron spectroscopy. The results indicated that the sputter-deposited nanocrystalline Al2O3 film consisted of single θ-Al2O3 phase with average grain size about 60 nm. The hardness and the elastic modulus of the as-deposited nanocrystalline Al2O3 film were about 17.21 GPa and 217 GPa measured by nanoindentation instrument, respectively. The corrosion behavior of the sputter-deposited nanocrystalline Al2O3 film in 3.5%NaCl solution was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The amount of porosity for the sputter-deposited nanocrystalline Al2O3 film calculated by two electrochemical methods was equal to 0.0086% and 0.168%, respectively. The sputter-deposited nanocrystalline Al2O3 film exhibited excellent corrosion resistance, which was attributed to its dense enough structure to prevent magnesium alloy from corrosion in aggressive solutions.
Journal: Materials Characterization - Volume 61, Issue 2, February 2010, Pages 249–256