Enhancing corrosion resistance by Shear-Rolling Process-Induced less defective graphene

Abstract

The study investigates the effects of shear-rolling on the structural evolution and corrosion resistance properties of oxygen plasma treated-reduced graphene oxide (P-rGO) coated aluminum (Al). The abundant surface oxygen-containing groups induced by plasma treatment enhance the interfacial bonding between P-rGO and Al. The phenomenon of self-healing is observed in P-rGO upon the application of shear-rolling. Comprehensive analyses, including Raman, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Laser scanning confocal microscopy (LSCM), X-ray diffraction (XRD) analyses, collectively reveal that P-rGO forms a robust bind with Al, serving as an effective corrosion barrier. The enhanced protective performance of P-rGO is largely attributed to the less-defective graphene layer and strong adhesion to Al, which limits electrolyte penetration and reduces corrosion susceptibility. Subsequent scanning electron microscopy (SEM) images post-corrosion testing confirm that P-rGO maintains a smooth surface in contrast to bare Al and rGO coated Al, which exhibit more substantial surface deterioration. The results highlight the potential of shear-rolling as an effective method for enhancing the performance of graphene-based coatings in protective applications.