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

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 PBI0.5%/GR0.5%/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 PBI0.5%/GR0.5%/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 PBI0.5%/GR0.5%/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.

Nanorod-Like Organic Active Materials Directly Grown on the Carbon Cloth for Aqueous Zn-Ion Batteries

“…After the ring of the PTCDA functional group was completely opened, the IR peak corresponding to the ester group at 1550 cm –1 was observed as a result of the ring opening. In addition, the C–O stretch peak of the dianhydride structure is observed at 1300 cm –1 when the mixing ratio of PTCDA and NaOH is low or for the case of pristine PTCDA . However, no anhydride peak is captured in NaPT formed after PTCDA reacts with sufficient base.…”

“…In addition, the C−O stretch peak of the dianhydride structure is observed at 1300 cm −1 when the mixing ratio of PTCDA and NaOH is low or for the case of pristine PTCDA. 30 However, no anhydride peak is captured in NaPT formed after PTCDA reacts with sufficient base. When NaPT was subjected to the hydrothermal reaction without adding H 3 PO 4 acid, the ester group remained and no carbonyl groups were observed (Figure S3 of the Supporting Information), which means that the formation of the closed ring structure could not proceed through the hydrothermal reaction in the absence of acid.…”