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

Li Lao; Kuo Liu; Li Ren; Jinhong Yu; Jingzhen Cheng; Yuqi Li; Shaorong Lu

doi:10.1021/acsomega.0c05866

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

ACS Omega. 2021 Mar 9;6(11):7434-7443. doi: 10.1021/acsomega.0c05866. eCollection 2021 Mar 23.

Authors

Li Lao¹, Kuo Liu¹, Li Ren¹, Jinhong Yu², Jingzhen Cheng¹, Yuqi Li¹, Shaorong Lu¹

Affiliations

¹ Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China.
² Key Laboratory of Marine Materials and Relater Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.

Abstract

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 10⁹ Ω·cm² 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 (10⁶ Ω·cm²). 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.