Boron-containing low-carbon steel oxide film and preparation method thereof

A method for preparing a boron-containing low-carbon steel oxide film, comprising:

• performing micro-arc oxidation on boron-containing low-carbon steel in an electrolyte by using the boron-containing low-carbon steel as an anode, to obtain a boron-containing low-carbon steel oxide film,
• wherein the electrolyte contains sodium meta aluminate of 5 g/L to 25 g/L, sodium dihydrogen phosphate of 2 g/L to 10 g/L, sodium carbonate of 2 g/L to 15 g/L, and glycerol of 2 g/L to 8 g/L, and
• wherein parameters of the micro-arc oxidation comprise:
• current density of 0.5 mA/cm2 to 300 mA/cm2, a positive voltage of 450V to 700V, a negative voltage of 50V to 100V, a current frequency of 200 Hz to 2000 Hz, a ratio of positive frequency to negative frequency of 0.5 to 2, a positive duty ratio of 15% to 40%, a negative duty ratio of 10% to 25%, reaction duration of 20 min to 50 min, and a reaction temperature of 20° C. to 60° C.