Electrochemical synthesis and surface protection of polypyrrole-CeO^sub 2^ nanocomposite coatings on AA2024 alloy

A facile approach based on electrochemical polymerization was used to synthesize polypyrrole/CeO2 (PPy/CeO2) nanocomposite on an AA2024 alloy surface. CeO2 nanoparticles (NPs) embedded in the PPy matrix were observed using FESEM micrographs with EDX analysis. IR and UV-vis spectroscopy were used to...

Full description

Saved in:
Bibliographic Details
Published in:Synthetic metals 2017-12, Vol.234, p.18
Main Authors: Kumar, A Madhan, Babu, R Suresh, Ramakrishna, Suresh, de Barros, Ana LF
Format: Article
Language:English
Subjects:
Alloys
Cerium oxides
Chemical synthesis
Corrosion
Corrosion prevention
Electrochemical corrosion
Electrochemical impedance spectroscopy
Infrared radiation
Nanocomposites
Nanoparticles
Polymerization
Polypyrroles
Protective coatings
Raman spectra
Substrates
Thermal stability
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A facile approach based on electrochemical polymerization was used to synthesize polypyrrole/CeO2 (PPy/CeO2) nanocomposite on an AA2024 alloy surface. CeO2 nanoparticles (NPs) embedded in the PPy matrix were observed using FESEM micrographs with EDX analysis. IR and UV-vis spectroscopy were used to characterize the synthesized PPy/CeO2 nanocomposite. The Raman spectra reflected the interactions between the p-conjugated structure of PPy and CeO2 NPs. TGA thermograms revealed improved thermal stability of the synthesized nanocomposite and were used to determine the amount of nano ceria incorporated in the PPy matrix. The electrochemical corrosion behavior of the coated alloys in 0.6 M NaCl solution was examined through potentiodynamic polarization and electrochemical impedance spectroscopic (EIS) measurements. From these electrochemical studies, a larger shift of Ecorr in the positive direction with a high amount of CeO2 in the nanocomposite was obtained, as well as a maximum corrosion protection efficiency of 99.64% by incorporating 3% of CeO2 NPs in the PPy coatings. EIS studies also confirmed the enhanced corrosion protection behavior of PPy/CeO2 coatings with higher Rct, Rf and lower CPEdl values compared to those of pure PPy coatings. The results showed that the PPy coatings with CeO2 nanoparticles can be potential coating materials for the corrosion protection of AA2024 alloys substrates.
ISSN:0379-6779