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Transparency anticorrosion coatings prepared from alumina-covered graphene oxide/polyimide nanocomposites

2019; Budapest University of Technology and Economics; Volume: 13; Issue: 9 Linguagem: Inglês

10.3144/expresspolymlett.2019.66

1788-618X

Guan-Hui Lai, Tsao‐Cheng Huang, I-H. Tseng, B-S. Huang, T-I. Yang, M-H Tsai,

Concrete Corrosion and Durability

In this study, a novel alumina-covered graphene oxide/polyimide (AlGO/PI) nanocomposite was developed as an anticorrosion coating material.The hydroxyl groups on GO reacted with aluminum isopropoxide via a sol-gel process to yield AlGO nanosheets.The characterization and structure were confirmed by Fourier transform infrared spectrometry, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, and field emission transmission electron microscopy.Subsequently, GO and AlGO were incorporated into a PI matrix, leading to the formation of GO/PI and AlGO/PI nanocomposites.Well-dispersed AlGO nanosheets in the PI matrix acted as effective additives to enhance the water barrier properties of GO/PI (58 g/(m 2 •day)) and AlGO/PI (43 g/(m 2 •day)) coatings.Most importantly, the resultant AlGO/PI films exhibited excellent optical transparency (>75%) and anticorrosion properties.Electrochemical measurements of corrosion potential, polarization resistance, and corrosion current as well as electrochemical impedance spectroscopy confirmed that the AlGO/PI nanocomposites exhibited better anticorrosion properties than GO/PI nanocomposites.This is likely because the insulating layer of alumina on GO can isolate the charge transfer pathway between GO and the metal substrates, leading to improved anticorrosion behavior.