Polydopamine modified polyaniline-graphene oxide composite for enhancement of corrosion resistance

Ning Yang; Tao Yang; Wei Wang; Huaiyin Chen; Weihua Li

doi:10.1016/j.jhazmat.2019.05.063

Polydopamine modified polyaniline-graphene oxide composite for enhancement of corrosion resistance

J Hazard Mater. 2019 Sep 5:377:142-151. doi: 10.1016/j.jhazmat.2019.05.063. Epub 2019 May 28.

Authors

Ning Yang¹, Tao Yang², Wei Wang¹, Huaiyin Chen¹, Weihua Li³

Affiliations

¹ Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, PR China; Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology, Qingdao, 266000, PR China; University of Chinese Academy of Sciences, Beijing, 100039, PR China.
² College of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, PR China.
³ College of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, PR China. Electronic address: liweihua@qdio.ac.cn.

PMID: 31158583
DOI: 10.1016/j.jhazmat.2019.05.063

Abstract

In this study, the composite of two-dimensional graphene oxide (GO) nanosheets and button-shaped polyaniline (PANI) was synthesized and further modified by polydopamine (PDA). The obtained PDA-PANI-GO composite was used to enhance the corrosion protection ability of nontoxic water-based alkyd varnish (WAV). The chemical composition, functional groups and surface morphologies of GO, PANI-GO and PDA-PANI-GO composites were characterized by XRD, FT-IR XPS and SEM. The anticorrosion performance was demonstrated by electrochemical impedance spectroscopy measurements and polarization tests. Due to the physical barrier effects and surface hydrophobicity of PANI-GO composite, the approaches of the caustic substances to the surface of the metal was inhibited, while the highly adhesive PDA molecules reinforced compatibility between fillers and WAV. As results, PDA-PANI-GO composite introduced WAV enhanced corrosion prevention performance. Under the optimal conditions, where the ratio of PDA to PANI-GO was kept at 2:1, the impedance values increased by over two orders of magnitude compared with bare steel.

Keywords: Alkyd varnish; Corrosion resistance; Electrochemical measurements; Graphene oxide; Polyaniline; Polydopamine.