Corrosion Resistance of Graphene-Reinforced Waterborne Epoxy Coatings

doi:10.1016/j.jmst.2015.12.017

Abstract

Abstract:

Graphene (G) was dispersed uniformly in water and used as an inhibitor in waterborne epoxy coatings. The effect of dispersed G on anticorrosion performance of epoxy coatings was evaluated. The composite coatings displayed outstanding barrier properties against H2O molecule compared to the neat epoxy coating. Open circuit potential (OCP), Tafel and electrochemical impedance spectroscopy (EIS) analysis confirmed that the corrosion rate exhibited by composite coatings with 0.5 wt% G was an order of magnitude lower than that of neat epoxy coating. Salt spray test results revealed superior corrosion resistance offered by the composite coating.

Key words: Waterborne epoxy coating, Graphene, Corrosion resistance, Electrochemical impedance spectroscopy (EIS)

Shuan Liu, Lin Gu, Haichao Zhao, Jianmin Chen, Haibin Yu. Corrosion Resistance of Graphene-Reinforced Waterborne Epoxy Coatings[J]. J. Mater. Sci. Technol., 2016, 32(5): 425-431.

Figures/Tables 10

Preparation process of G-based waterborne E44 coatings.

IR spectra of G slurry, sodium polyacrylate, and sodium polyacrylate-G.

SEM images of dispersed G at low magnification (a) and high magnification (b).

AFM images (a) of a thin G film deposited on an Si-coated substrate and height profile (b) along the black line (from A to A0).

OCP curves for G-epoxy coating systems immersed in 3.5% NaCl solution after different times: (a) E44

(b) 0.5%G-E44

Potentiodynamic polarization curves for (a) bare steel, (b) E44 coated, (c) 0.5G-E44 coated and (d) 1.0%G-E44 coated electrode immersed in 3.5% NaCl solution after 48 h.

Nyquist and Bode plots of G-epoxy coating systems immersed in simulated seawater after different times: (a) E44

(b) 0.5%G-E44

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