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Corrosion protection by epoxy/poly(aniline‐co‐pyrrole)/ZnO nanocomposite coating
Author(s) -
Golshekan Mostafa,
Shirini Farhad
Publication year - 2019
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.48265
Subject(s) - materials science , epoxy , coating , dielectric spectroscopy , scanning electron microscope , polyaniline , composite material , nanocomposite , corrosion , aniline , chemical engineering , electrochemistry , polymer , chemistry , organic chemistry , engineering , polymerization , electrode
Anticorrosion behavior of epoxy/poly(aniline‐co‐pyrrole)/ZnO (EPAPZ) coating on stainless steel 304 alloys is investigated using the electrochemical impedance spectroscopy (EIS) method, and the coating is compared with epoxy/polyaniline/ZnO (EPAZ) and pure epoxy (EP) coatings. Scanning electron microscopy images are used for structural characterization and to compare the particle size of nanoparticles. EIS result showed that coating resistance for EPAPZ, EPAZ, and EP coatings after 90 days of immersion in 3.5% NaCl was 1.18 × 10 7 , 1.08 × 10 6 , and 4.28 × 10 4 Ω cm −2 , respectively. In addition, the volume percentage of water absorbed by the coating, which could be obtained by coating capacitance, is 2.81, 4.21, and 9.11, respectively. Immersion tests showed 0.063, 0.194, and 0.752% of weight loss in the metals under EPAPZ, EPAZ, and EP coatings, respectively. These results show that the EPAPZ coating has superior anticorrosive performance compared with EPAZ and EP coatings. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48265.