| Titre : |
Evaluation of the corrosion protection of defective polyaniline/epoxy coating by localized electrochemical impedance spectroscopy |
| Type de document : |
texte imprimé |
| Auteurs : |
Yingjun Zhang, Auteur ; Yawei Shao, Auteur ; Guozhe Meng, Auteur ; Tao Zhang, Auteur ; Fuhui Wang, Auteur |
| Année de publication : |
2015 |
| Article en page(s) : |
p. 777-785 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Anticorrosifs
Anticorrosion
Epoxydes
Magnésium -- Alliages
Polyaniline
Revêtements protecteurs
Spectroscopie d'impédance électrochimique
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Defective epoxy varnish and hydrofluoric acid-doped polyaniline/epoxy (PANI-HF/EP) coatings were coated on the surface of an AZ91D magnesium alloy. The corrosion protection of the defective coatings was evaluated in 0.05 M NaCl by localized electrochemical impedance spectroscopy. Then, the surface of AZ91D magnesium alloy beneath the coating was analyzed by scanning electron microscopy and energy dispersive X-ray spectroscopy. The results indicated that the defective epoxy varnish coating could not protect the magnesium alloy because it only served as an electrolyte barrier. By contrast, the PANI-HF/EP coating served not only as an electrolyte barrier, but also facilitated the formation of a protective layer by redox processes. Therefore, the defective PANI-HF/EP coating could protect magnesium alloy from corrosion. |
| Note de contenu : |
- EXPERIMENTAL : Materials and sample preparation - Local electrochemical impedance measurements - SEM and EDS
- RESULTS : LEIS measurements - Surface morphology analysis - Surface component analysis
- DISCUSSION : Corrosion protection of the defective epoxy varnish coating - Corrosion protection of the defective PANI-HF/EP coating |
| DOI : |
10.1007/s11998-015-9679-y |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9679-y.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24412 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 777-785
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