Promising graphitic carbon nitride/MoOx nanocomposites: For surface protective performance of AA2024 alloys in marine environment

By Kumar, A. Madhan; Khan, Mohd Yusuf; Suleiman, Rami K.; Khan, Abuzar; Dafalla, Hatim
Published in Surface and Coatings Technology 2019

Abstract

A wide variety of carbon nanostructured materials have been effectively inspected as nanofillers to enhance the overall performance of the polymeric coatings; however, their practical applications are still limited by the high cost. Graphitic carbon nitride (GN) is considered as the best alternative due to its low cost and unique structural and mechanical features. Herein, we synthesized the GN-MoOx nanocomposite and utilized it as nanofillers to enhance the corrosion resistant behavior of epoxy coatings on AA2024 Al alloys in chloride medium. The rod-shaped MoOx nanoparticle with a diameter of 25 nm was obtained on the lamellar surface of GN in Scanning Electron Microscopic (SEM) and Transmission Electron Microscopic (TEM) images. The structural analyses results validate the monoclinic phase and formation of the GN/MoOx nanostructure. The Attenuated Total Reflectance-Infrared (ATR-IR) spectra of GN/MoOx illustrate distinctive poly-s-triazine peaks from 1200 to 1640 cm?1. The electrochemical corrosion results reveal that the nanocomposite reinforced epoxy coatings can deliver a higher corrosion resistant performance and the maximum corrosion protection can be attained via reinforcing the epoxy coatings with 3 wt% GN/MoOx. Based on the obtained outcomes of this present investigation, we envision that the GN/MoOx nanocomposite has a great potential in improving the surface protective behavior of epoxy coatings on AA2024 alloy against corrosion in chloride medium.

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