Promoting Barrier Performance and Cathodic Protection of Zinc-Rich Epoxy Primer via Single-Layer Graphene

Jingrong Liu; Tao Liu; Zhangwei Guo; Na Guo; Yanhua Lei; Xueting Chang; Yansheng Yin

doi:10.3390/polym10060591

Polymers (May 2018)

Promoting Barrier Performance and Cathodic Protection of Zinc-Rich Epoxy Primer via Single-Layer Graphene

Jingrong Liu,
Tao Liu,
Zhangwei Guo,
Na Guo,
Yanhua Lei,
Xueting Chang,
Yansheng Yin

Affiliations

Jingrong Liu: College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
Tao Liu: College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
Zhangwei Guo: College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
Na Guo: College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
Yanhua Lei: College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
Xueting Chang: College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
Yansheng Yin: College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China

DOI: https://doi.org/10.3390/polym10060591
Journal volume & issue: Vol. 10, no. 6
p. 591

Abstract

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The effect of single-layer graphene sheets (Gr) on the corrosion protection of zinc-rich epoxy primers (ZRPs) was investigated. Scanning electron microscopy (SEM) with an energy dispersive spectrometer (EDS) were used to characterize morphology and composition of the coatings after immersion for 25 days. The cross-sectional SEM images and X-ray photoelectron spectroscopy (XPS) confirmed that the addition of single-layer graphene facilitated assembling of zinc oxides on the interface between the coating and the steel. The open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) measurements revealed that both the cathodic protection and barrier performance of the ZRP were enhanced after addition of 0.6 wt. % Gr (Gr0.6-ZRP). In addition, the cathodic protection property of the Gr0.6-ZRP was characterized quantitatively by localized electrochemical impedance spectroscopy (LEIS) in the presence of an artificial scratch on the coating. The results demonstrate that moderate amounts of single-layer graphene can significantly improve corrosion resistance of ZRP, due to the barrier protection and cathodic protection effects.

Published in Polymers

ISSN: 2073-4360 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry: Organic chemistry
Website: http://www.mdpi.com/journal/polymers/

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