pH responsive Ce(III) loaded polyaniline nanofibers for self-healing corrosion protection of AA2024-T3

•Cerium nitrate loaded polyaniline (PANI) nanofibers are synthesized via a soft template chemical route.•Ce(III)-PANI complex is pH sensitive, and a change of pH can cause breaking of the complex and releasing of Ce(III).•The Ce(III)-PANI nanofibers are embedded into epoxy ester coating for self-hea...

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Bibliographic Details
Published in:Progress in organic coatings 2016-10, Vol.99, p.197-209
Main Authors: Pirhady Tavandashti, N., Ghorbani, M., Shojaei, A., Gonzalez-Garcia, Y., Terryn, H., Mol, J.M.C.
Format: Article
Language:English
Subjects:
Cerium nitrate
Coating
Corrosion
Corrosion prevention
Electrochemical impedance spectroscopy
Epoxy esters
Nanofibers
pH-triggered release
Polyaniline (PANI)
Polyanilines
Protective coatings
Self-healing
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Summary:•Cerium nitrate loaded polyaniline (PANI) nanofibers are synthesized via a soft template chemical route.•Ce(III)-PANI complex is pH sensitive, and a change of pH can cause breaking of the complex and releasing of Ce(III).•The Ce(III)-PANI nanofibers are embedded into epoxy ester coating for self-healing corrosion protection of AA2024-T3.•pH triggered release of Ce(III) from PANI nanofiber (in case of corrosion) results in a superior corrosion protection performance. Cerium nitrate loaded polyaniline (PANI) nanofibers were synthesized in this work via a chemical route. PANI nanofibers act as a host structure for the corrosion inhibitor, forming a Ce(III)-PANI complex. This complex is pH sensitive, and a change of pH can cause breaking of the complex and releasing of Ce(III). The Ce(III) loaded PANI nanofibers were embedded into epoxy ester coating and the self-healing corrosion protection ability was investigated by Scanning Vibrating Electrode Technique (SVET) and Electrochemical Impedance Spectroscopy (EIS). The results showed that by embedding of Ce(III) loaded PANI nanofibers into the coatings a superior corrosion protection and self-healing performance is obtained. Local change of pH due to corrosion stimulates the release of Ce(III) from PANI nanofibers. The released Ce(III) precipitates out as insoluble cerium hydroxides at regions of local high pH, which results in slowing down the cathodic reaction and reducing further corrosion. Accordingly, a synergistic effect of Ce(III) corrosion inhibitor together with PANI nanofibers was observed as additives for epoxy ester coating.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2016.04.046