Open AccessCorrosion resistance of graphene/waterborne epoxy composite coatings in CO 2 -satarated NaCl solution
Author(s) -
Hao Xu,
Haijun Hu,
Hongmei Wang,
Yongjun Li,
Yun Li
Publication year - 2020
Publication title -
royal society open science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 51
ISSN - 2054-5703
DOI - 10.1098/rsos.191943
Subject(s) - epoxy , materials science , graphene , corrosion , dielectric spectroscopy , composite material , composite number , coating , scanning electron microscope , fourier transform infrared spectroscopy , raman spectroscopy , chemical engineering , electrochemistry , nanotechnology , electrode , chemistry , physics , optics , engineering
This study investigated the corrosion resistance of graphene/waterborne epoxy composite coatings in CO 2 -satarated NaCl solution. The coatings were prepared by dispersing graphene in waterborne epoxy with the addition of carboxymethylcellulose sodium. The structure and composition of the coatings were characterized by scanning electron microscopy, transmission electron microscopy, Fourier-transform infrared and Raman spectroscopies. The corrosion resistance of the composite coatings was investigated by potentiodynamic polarization measurements and electrochemical impedance spectroscopy. Composite coatings with more uniform surfaces and far fewer defects than blank waterborne epoxy coatings were obtained on 1020 steel. The 0.5 wt% graphene/waterborne epoxy composite coating exhibited a much lower corrosion rate and provided better water resistance properties and long-term protection than those of the blank epoxy coating in CO 2 -satarated NaCl solution.