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To improve the surface corrosion resistance of the alumina films fabricated by micro-arc oxidation (MAO),Al2O3 coatings at different current densities (5,7 and 10 A/dm 2) were produced on aluminum alloys by adding SiC nano-particles into electrolyte during MAO process.The morphology and phase composition of the coatings were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD),respectively.Furthermore,the corrosion performance of the coatings was evaluated via a three-electrode system in a 3.5 wt pct NaCl solution.From the obtained morphology of alumina coatings,it was believed that the Al2O3 coatings embedded with SiC nano-particles were formed.The electrochemical impedance spectroscopy (EIS) plots and potentiodynamic polarization plots of the Al2O3 coatings with and without SiC nano-particles at different current densities reveal that the Al2O3 coatings with SiC nano-particles formed at 10 A/dm 2 showed the better corrosion resistance than the other coatings produced at 5 and 7 A/dm 2.
To improve the surface corrosion resistance of the alumina films fabricated by micro-arc oxidation (MAO), Al2O3 coatings at different current densities (5,7 and 10 A / dm 2) were produced on aluminum alloys by adding SiC nano-particles into electrolyte during MAO process. The morphology and phase composition of the coatings were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. Focusmore, the corrosion performance of the coatings was evaluated via a three-electrode system in a 3.5 wt pct NaCl solution. Get the morphology of alumina coatings, it was believed that the Al2O3 coatings embedded with SiC nano-particles were formed. The electrochemical impedance spectroscopy (EIS) plots and potentiodynamic polarization plots of the Al2O3 coatings with and without SiC nano-particles at different current densities reveal that the Al2O3 coatings with SiC nano-particles formed at 10 A / dm 2 showed the better corrosion resistance than the other coatings produced at 5 and 7 A / dm 2.