Graphene oxide (GO) is a two-dimensional carbon nanomaterial known for its exceptional mechanical strength and tunable, functional surface, making it a promising material for protective barriers against harmful external influences. For this purpose, it is used as a filler in epoxy coatings to increase the tortuous diffusion path of the corrosive medium within the coating. Additionally, the incorporation of aluminum nanoparticles (Al NP) onto the GO surface can improve the dispersion of GO sheets, reduce their aggregation, and maintain the passive oxidation film formed by the degradation of Al NP. In this study, epoxy coatings containing Al NP–GO powder with different weight fractions of GO material were prepared. The physical, anticorrosive, and antibacterial properties of unmodified and modified coatings were evaluated. On the macroscopic electrochemical micro-level, the EP+MAX sample provided stable corrosion protection for 60 days, whereas the resistance of other samples decreased. Measurements performed on micro-surfaces (500 μm) showed an increase in impedance per unit area with the addition of Al NPs-GO powder. The best corrosion resistance was demonstrated by the EP+MIN and EP+MAX samples. Furthermore, using the ic-dc microscopic SECM method, it was determined that Fe²⁺ dissolution at the scratch area was reduced in the modified samples. Additionally, it was found that the epoxy coating acquires new antibacterial properties, thus gaining dual functionality.
Kurtela et al. (Wed,) studied this question.
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