Morphology and Structure Characterization of Micro-arc Oxidation Film on Cast Al Alloy
The morphology and phase components of micro-arc oxidation film on LY12 and YL112 aluminum alloy were analyzed by SEM and XRD.The effects of element content and electrolyte on the micro-arc oxidation film on cast aluminum alloy were discussed.The results show that,on this experiment condition,the ceramic layer is mainly composed of γ-Al2O3.Silicon exists in phosphoric acid salt electrolyte system with the form of SiO2and in the sodium silicate electrolyte system with the form of 3Al2O3.2SiO2,including a little Cu2O,influenced by silicon and copper element.There are bulky grain of ceramic film and wide-aperture of hole in phosphoric acid salt electrolyte system,and the microstructure is loose.