US 10,889,910 B2
Boron-containing low-carbon steel oxide film and preparation method thereof
Minfang Chen, Tianjin (CN); Yankun Li, Tianjin (CN); Chen You, Tianjin (CN); and Haifeng Liu, Tianjin (CN)
Assigned to Tianjin University of Technology, Tianjin (CN)
Filed by Tianjin University of Technology, Tianjin (CN)
Filed on Mar. 28, 2019, as Appl. No. 16/367,907.
Claims priority of application No. 2018 1 0281232 (CN), filed on Apr. 2, 2018.
Prior Publication US 2019/0301045 A1, Oct. 3, 2019
Int. Cl. C25D 11/34 (2006.01); C25D 11/02 (2006.01)
CPC C25D 11/34 (2013.01) [C25D 11/024 (2013.01); C25D 11/026 (2013.01); C25D 11/028 (2013.01)] 8 Claims
OG exemplary drawing
 
1. 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,
wherein parameters of the micro-arc oxidation comprise: current density of 0.1 mA/cm2 to 300 mA/cm2, a positive voltage of 500V to 700V, a negative voltage of 20V to 80V, a current frequency of 200 Hz to 2000 Hz, a ratio of positive frequency to negative frequency of 1 to 2, a positive duty ratio of 15% to 40%, a negative duty ratio of 10% to 20%, reaction duration of 20 min to 60 min, and a reaction temperature of 20° C. to 60° C.