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The performance of epoxy coatings containing polyaniline (PANI) nanowires in neutral salt, alkaline, and acidic aqueous media
Author(s) -
Gao Min,
Wang Jixiao,
Zhou Yu,
He Pei,
Wang Zhi,
Zhao Song
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49049
Subject(s) - polyaniline , epoxy , materials science , thermogravimetric analysis , coating , salt spray test , scanning electron microscope , aqueous solution , passivation , fourier transform infrared spectroscopy , chemical engineering , dielectric spectroscopy , nanowire , nuclear chemistry , composite material , electrochemistry , electrode , nanotechnology , chemistry , polymer , organic chemistry , layer (electronics) , engineering , polymerization
PANI/epoxy coatings have great promise applications in the industry as the metal corrosion protection coating, and their performance directly determines the life span of the coating and equipment durability. In this study, the performance of epoxy coatings with and without PANI nanowires immersed in 12 wt% NaCl, 5 wt% HCl, and 5 wt% NaOH solutions at different temperature were investigated for the first time. The performance and the degradation reactions of the coating cooperated with PANI nanowires were characterized by the variety of techniques and methods, including ultraviolet–visible spectrophotometry (UV–vis), field emission scanning electron microscopy (SEM), Attenuated Total Reflectance‐Fourier transform Infrared spectroscopy (ATR‐FTIR), and thermogravimetric analysis (TGA). The experiment results indicated that the failure mechanism of the different coatings varied with the different temperatures and solutions. Electrochemical impedance spectra (EIS) results showed that an appropriate content of PANI nanowires improve the protection performance of epoxy coatings in 12 wt% NaCl, 5 wt% HCl, and 5 wt% NaOH solutions, which is attributed to the passivation ability and shielding effect of PANI nanowires.