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Revisiting graphene-polymer nanocomposite for enhancing anti-corrosion performance: A new insight into interface chemistry and diffusion model

Abstract

Graphene is impermeable to all molecules and high chemical stability, making it excellent anti-corrosion coatings for metals. However, current studies have indicated the galvanic coupling between graphene and metal actually accelerate corrosion at the interface. Due to the insulating of polymer, the graphene-polymer composite coatings with strong interaction between filler and the polymer matrix is an alternative to address this issue. Nevertheless, such coatings require well-dispersed graphene flakes to elongate diffusion path of gas or liquid, while prevents the conducting network from graphene to metal. The difficulty in preparing such coatings was mainly due to the uneasy control of the assembled phase during the interface reaction. Herein, the interaction between filler and the polymer was found to be a key factor governing anticorrosion performance, which is scarce in the previous report. The graphene as filler in anticorrosion coatings lies in its dispersibility and miscibility with both the casting solvent and the polymer. The electrochemically exfoliated graphene (EC-graphene) with proper surface functionality, allowing well-miscibility with waterborne polyurethane (PU) and hydrophobic epoxy, which was found to be an ideal filler outperforming other graphene materials like graphene oxide (GO) and reduced graphene oxide (rGO). Further, a bilayer coating with ECG additives for PU over epoxy is found to lower the corrosion rate (CR) to 1.81×10-5 mm/year. With only less than 1% graphene loading this shows the lowest CR ever obtained for copper and steel substrates and a diffusion coefficient nearly 2.2 times lower than the pristine polymer. Furthermore, we have shown that by controlling the amounts of graphene loading in the polymer, the galvanic corrosion favored by the formation of interconnected graphene percolation network can successfully be diminished. The present study together with the facile and eco-friendly method of nanocomposite synthesis pave the way toward practical applications on developing graphene-based anticorrosion coatings.

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Publication details

The article was received on 20 Apr 2018, accepted on 08 Jun 2018 and first published on 08 Jun 2018


Article type: Paper
DOI: 10.1039/C8NR03261K
Citation: Nanoscale, 2018, Accepted Manuscript
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    Revisiting graphene-polymer nanocomposite for enhancing anti-corrosion performance: A new insight into interface chemistry and diffusion model

    D. Dutta, A. N. F. Ganda, J. K. Chih, C. Huang, C. J. Tseng and C. Y. Su, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR03261K

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