Abstract: Micro-arc oxidation, as an excellent surface treatment method, is suitable for aluminum, magnesium, titanium, and other valve metals. However, the current energy required for micro-arc oxidation treatment is too high. The high production cost does not conform to the concept of green development, which limits its application. A bidirectional pulse power was supplied for the MAO process.Micro-arc oxidation films were prepared on the surface of 2A12 aluminum alloy in Na₂SiO₃-KOH electrolyte system.Adding additive NaF in the electrolyte, the micro-arc oxidation film was prepared under low voltage using stepwise voltage boost. The corrosion resistance was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), electron energy spectrum analysis (EDS) and electrochemical workstation. The results show that adding NaF can effectively reduce the voltage required of micro-arc oxidation, and the reaction can be achieved when the forward voltage is 220V. The main composition of the film is Al, Si and O, and the phase structure is mainly α-Al₂O₃ and amorphous Al₂O₃. The corrosion resistance is better when the number of pressure boost segments is 4, the rate of pressure boost is 10 V/min and the concentration of NaF is 1g/L.