Improving Corrosion Protection and Friction Resistance of Q235 Steel by Combining Noncovalent Action and Rotating Coating Method

[Image: see text] Developing waterborne epoxy (WEP) coatings with excellent corrosion resistance and tribological properties is a key aspect to solve the damage of Q235 steel. In this work, perylene bisimide (PBI) derivatives dispersion graphene (GR) were prepared by a π–π stacking, the highly orientated PBI(0.5%)/GR(0.5%)/WEP coating will be prepared by the rotating coating method. Especially, the impedance value reached about 10(9) Ω·cm(2) when the PBI and GR ratio is 1:1. The impedance value of PBI(0.5%)/GR(0.5%)/WEP coating increased by 3 orders of magnitude compared with that of pure WEP coating (10(6) Ω·cm(2)). Additionally, the coefficient of friction of the coatings was 0.33; compared with that of WEP, the coefficient of friction decreased by 48%, and the wear resistance increased by 87.6%. The results show that the PBI(0.5%)/GR(0.5%)/WEP coatings exhibited excellent corrosion resistance and wear resistance properties due to the good dispersion and high orientation of PBI/GR in WEP. It is anticipated that our current work would guide the ongoing efforts to develop a more efficient method to overcome the poor dispersion of GR in waterborne epoxy resin and provide a green coating with excellent corrosion resistance and wear resistance properties.