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

eXPRESS Polymer Letters

G-H. Lai¹ 

关键词: polymer composites;    polyimide;    alumina-covered graphene oxide;    anticorrosion;   

DOI  :  10.3144/expresspolymlett.2019.66

学科分类：生物科学（综合）

来源: eXPRESS Polymer Letters

【 摘 要 】

In this study, a novel alumina-covered graphene oxide/polyimide (AlGO/PI) nanocomposite was developed as ananticorrosion coating material. The hydroxyl groups on GO reacted with aluminum isopropoxide via a sol-gel process to yieldAlGO nanosheets. The characterization and structure were confirmed by Fourier transform infrared spectrometry, X-ray photoelectronspectroscopy, 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 ofGO/PI (58 g/(m2·day)) and AlGO/PI (43 g/(m2·day)) coatings. Most importantly, the resultant AlGO/PI films exhibited excellentoptical transparency (>75%) and anticorrosion properties. Electrochemical measurements of corrosion potential, polarizationresistance, and corrosion current as well as electrochemical impedance spectroscopy confirmed that the AlGO/PI nanocompositesexhibited better anticorrosion properties than GO/PI nanocomposites. This is likely because the insulating layer of alumina onGO can isolate the charge transfer pathway between GO and the metal substrates, leading to improved anticorrosion behavior.

【 授权许可】

CC BY