Abstract
The effect of single-layer graphene sheets (Gr) on the corrosion protection of zinc-rich epoxy primers (ZRPs) was investigated. Scanning electron microscopy (SEM) with an energy dispersive spectrometer (EDS) were used to characterize morphology and composition of the coatings after immersion for 25 days. The cross-sectional SEM images and X-ray photoelectron spectroscopy (XPS) confirmed that the addition of single-layer graphene facilitated assembling of zinc oxides on the interface between the coating and the steel. The open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) measurements revealed that both the cathodic protection and barrier performance of the ZRP were enhanced after addition of 0.6 wt. % Gr (Gr0.6-ZRP). In addition, the cathodic protection property of the Gr0.6-ZRP was characterized quantitatively by localized electrochemical impedance spectroscopy (LEIS) in the presence of an artificial scratch on the coating. The results demonstrate that moderate amounts of single-layer graphene can significantly improve corrosion resistance of ZRP, due to the barrier protection and cathodic protection effects.
Highlights
Zinc-rich primers (ZRPs) are some of the most widely used and effective materials for protecting steels against corrosion [1,2,3]
Some pores and defects can be observed on the surface of the coating A, which indicates the coating A degraded after immersion of 25 days
Corrosion protection mechanisms were examined with zinc-rich epoxy primers with and without single-layer graphene sheets (Gr) in a 3 wt. % NaCl solution
Summary
Zinc-rich primers (ZRPs) are some of the most widely used and effective materials for protecting steels against corrosion [1,2,3]. Their anticorrosion properties mainly depend on two protective mechanisms when the electrolyte penetrates into the ZRPs [4,5,6,7]. ZRPs exhibit barrier protection by forming a stable layer of zinc oxidation products. These products fill the pores of the coating and act as an insulating barrier that stops the electrolyte from reaching the steel surface [8]. The low utilization of zinc powder results in environmental pollution and is a waste of resources
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