Microstructure and corrosion properties of zinc-graphene oxide composite coatings

•Zn-graphene oxide (Zn-GO) and Zn-GO-Zn multilayer coating were electrodeposited.•Corrosion of Zn-GO and Zn-GO-Zn multilayer coating was investigated.•Corrosion resistance of Zn-GO was due to GO induced reduction in Zn grain size.•Corrosion resistance of Zn-GO-Zn was due to the impermeability of GO....

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Bibliographic Details
Published in:Corrosion science 2019-05, Vol.152, p.234-248
Main Authors: M Y, Rekha, Srivastava, Chandan
Format: Article
Language:English
Subjects:
A. Graphene oxide
A. Zinc coatings
B. EIS
B. Polarization
B. TEM
C. Impermeability
Coated electrodes
Corrosion rate
Corrosion resistance
Graphene
Microstructure
Multilayers
Oxidation
Permeability
Protective coatings
Zinc coatings
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Summary:•Zn-graphene oxide (Zn-GO) and Zn-GO-Zn multilayer coating were electrodeposited.•Corrosion of Zn-GO and Zn-GO-Zn multilayer coating was investigated.•Corrosion resistance of Zn-GO was due to GO induced reduction in Zn grain size.•Corrosion resistance of Zn-GO-Zn was due to the impermeability of GO. Microstructure and corrosion properties of electrodeposited zinc-graphene oxide (Zn-GO) composite coatings and Zn-GO-Zn multilayer coating was investigated. Addition of GO enhanced the corrosion resistance of the composite coating. Microstructural characterization revealed that the enhancement in the corrosion resistance was due to GO induced significant reduction in Zn grains sizes which would facilitate formation of protective oxide layer. Microstructural characterization of exposed Zn-GO-Zn multilayer coatings revealed relatively lesser oxidation of Zn regions beneath the GO layer which further illustrated the role of impermeability of GO towards hindering the penetration of the electroactive media and thereby retarding the corrosion rate.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2019.03.015