Abstract
Microarc oxidation(MAO) was used to prepare the coatings on the surface of Al-Si alloy. Besides, scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) were utilized to research the microstructure characteristics, the components distribution, and the phase compositions, for the microarc oxidation coatings on Al-Si alloys. Furthermore, the growth process and wear properties of the coatings were explored. Results indicated that:the phase compositions of microarc oxidized coating consisted of mullite (3Al2O3·2SiO2), α- Al2O3 and γ- Al2O3. With the increase of load, the friction coefficient of the coating decreased, however it was greater than that of Al-Si alloy substrate. The wear resistance of the coating were one time higher than that of the substrate.
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