Preparation and anti-corrosion performance of superhydrophobic silane/graphene oxide composite coating on copper

Superhydrophobic silane/graphene oxide (GO) composite coating with excellent anti-corrosion performance and durability was successfully synthesized on copper surface using simple dipping and subsequent curing procedure. ATR-FTIR spectroscopy, Raman spectra, X-ray photoelectron spectroscopy and scanning electron microscopy were applied to investigate the structure and morphology of the prepared superhydrophobic silane/GO composite coating. Results suggested the covalent reaction between silane and GO nanosheets to form a more protective and durable coating. Electrochemical methods were conducted to research the anti-corrosion properties of the prepared silane/GO composite coating in 1 M NaCl solution. Potentiodynamic polarization curves indicated that both the cathodic and anodic reaction was inhibited and the corrosion current density decreased more than two orders of magnitude compared to the bare copper substrate. Electrochemical impedance spectroscopy suggested that the prepared superhydrophobic silane/GO composite coating possessed the largest impedance modulus and the protection efficiency was over 99% after exposed to 1 M NaCl solution 120 h. The good protection property and durability, along with the facile preparation route, implies a significant prospect for practical applications.

Automated summary

The superhydrophobic silane/graphene oxide (GO) composite coating synthesized on copper surface showed excellent anti-corrosion performance and durability. The covalent reaction between silane and GO nanosheets was found to form a more protective and durable coating. The prepared coating exhibited a corrosion current density decrease of over two orders of magnitude in a 1 M NaCl solution, indicating a high protection efficiency and durability.