▎ 摘　　要

NOVELTY - Preparing surface modified steel graphene ultra-smooth film comprises (i) performing chemical mechanical polishing of the steel material to obtain polished steel material having surface roughness of less than 1 nm; (ii) loading the polished steel material into a vacuum chamber, pumping to 1/asterisk10-3 Pa, where the purity of nitrogen is greater than 99.99%, the pressure is 25-40 Pa, the bias voltage is 1000-1300 V, the duty ratio is 60-80%, the frequency is 40-80 KHz, performing plasma nitriding on the surface at bombardment time of 2 hours, obtaining surface nitrogen-modified steel having surface forming FeNx compound, where the nitrogen content of the FeNx compound is less than or equal to 10%; and (iii) placing two surface-modified steels in parallel at pitch of 5 mm, simultaneously immersing in the graphene oxide colloidal solution as working electrode and counter electrode, connecting the anode and cathode of the direct current power supply. USE - The method is useful for preparing surface modified steel graphene ultra-smooth film. ADVANTAGE - The method is simple and easy, and has friction coefficient of less than 0.01. DETAILED DESCRIPTION - Preparing surface modified steel graphene ultra-smooth film comprises (i) performing chemical mechanical polishing of the steel material to obtain polished steel material having surface roughness of less than 1 nm; (ii) loading the polished steel material into a vacuum chamber, pumping to 1/asterisk10-3 Pa, where the purity of nitrogen is greater than 99.99%, the pressure is 25-40 Pa, the bias voltage is 1000-1300 V, the duty ratio is 60-80%, the frequency is 40-80 KHz, performing plasma nitriding on the surface at bombardment time of 2 hours, obtaining surface nitrogen-modified steel having surface forming FeNx compound, where the nitrogen content of the FeNx compound is less than or equal to 10%; and (iii) placing two surface-modified steels in parallel at pitch of 5 mm, simultaneously immersing in the graphene oxide colloidal solution as working electrode and counter electrode, connecting the anode and cathode of the direct current power supply, and performing electrophoresis deposition to obtain graphene film having thickness of 1 mm.