Peer-Reviewed Journal Details
Mandatory Fields
Conroy, KG;Breslin, CB
2003
February
Electrochimica Acta
The electrochemical deposition of polyaniline at pure aluminium: electrochemical activity and corrosion protection properties
Published
103 ()
Optional Fields
OXIDATION-STATE IMPEDANCE ALLOYS SPECTROSCOPY POLYPYRROLE BEHAVIOR ANILINE 2024-T3 LAYERS METAL
48
721
732
Polyaniline films were electrodeposited at pure aluminium from a tosylic acid solution containing aniline. These polymer films exhibited similar characteristics as pure polyaniline electrosynthesized at an inert platinum electrode, when removed from their respective substrates and dissolved in NMP. Both polymers had similar molecular weights and similar UV-visible absorption spectra. However, the aluminium substrate had a considerable effect on the electrochemical, activity of the films. The polyaniline films deposited at aluminium appeared to lose electroactivity and the electrochemical impedance data were governed by the oxidized aluminium substrate. This is consistent with a galvanic interaction between the polymer and the aluminium substrate, giving rise to oxidation of the aluminium and reduction of the polymer. The polyaniline deposits appeared to offer only a slight increase in the corrosion resistance of aluminium. Surface potential measurements, using a scanning vibrating probe, showed that attack initiated underneath the polymer under anodic polarization conditions, indicating that chloride anions diffuse across the polymer to react at the underlying aluminium substrate. (C) 2002 Elsevier Science Ltd. All rights reserved.
OXFORD
0013-4686
Grant Details