| Titre : |
Impedance sensor for the early failure diagnosis of organic coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Guangyi Cai, Auteur ; Haowei Wang, Auteur ; Dan Jiang ; Zehua Dong |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 1259-1272 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Capteurs (technologie)
Caractérisation
Essais de brouillard salin
Morphologie (matériaux)
Revêtements -- Détérioration
Revêtements organiques
Spectroscopie d'impédance électrochimique
Surfaces -- Analyse
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
A miniature impedance sensor used for field diagnosis of the early failure of coatings has been developed based on microelectronics and electrochemical impedance spectroscopy (EIS). The aging process of polyurethane-based coatings in salt spray test chamber was studied using the impedance sensor. Several critical indexes related to EIS such as phase angle (θ10Hz, θ15kHz), breakpoint frequency (fb), specific capacitance (C10Hz, C15kHz), and impedance modulus (Z0.1Hz) were proposed to evaluate the severity of coating degradation. The results indicated that the impedance sensor could accurately monitor the degradation process of coatings, and once Z0.1Hz < 106 Ω cm2, fb > 100 Hz, or θ10Hz < 20°, the coating may be regarded as completely degraded and fails to protect the metal substrate. |
| Note de contenu : |
- EXPERIMENTAL : Coating sensor - Sample preparation - Salt spray test - EIS measurement - Surface characterization
- RESULTS AND DISCUSSION : EIS of coated sensors and specimens - Morphology analysis - EIS parameters of coating degradation |
| DOI : |
10.1007/s11998-018-0072-5 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0072-5.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31338 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1259-1272
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