| Titre : |
Service life prediction of organic coatings: electrochemical impedance spectroscopy vs actual service life |
| Type de document : |
texte imprimé |
| Auteurs : |
Subrahmanya Shreepathi, Auteur ; Akshay Kumar Guin, Auteur ; Shrikant M. Naik, Auteur ; Mohan Rao Vattipalli, Auteur |
| Année de publication : |
2011 |
| Article en page(s) : |
p. 191-200 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Durée de vie (Ingénierie)
Electrochimie
Essais accélérés (technologie)
Essais de brouillard salin
Spectroscopie d'impédance électrochimique
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Electrochemical impedance spectroscopy (EIS) is used to derive an expression for predicting the service life of organic coating in a C4-type environment (industrial and costal areas with moderate salinity) as defined in ISO 12944 standard for paints and varnishes—corrosion protection of steel structures by protective paint systems. Three coating systems with a record of 2, 5, and 10 years of durability were selected for the study. The selection was also based on proven composition and dry film thickness (DFT) of the coatings as per ISO 12944. Electrochemical impedance measurements of the paint-coated panels were carried out by exposing the coated mild steel panels without scribe in different corrosive environments such as immersion in NaCl solution, neutral salt spray, etc. Neutral salt spray exposure was found to be the most severe corrosive environment among all the three coating systems. In most of the cases, EIS gave early indication of coating failure when compared to visual defects such as blistering and over-film corrosion. |
| Note de contenu : |
- EXPERIMENTAL :
System 1 : Low durable system for normal inland
System 2 : Mdium durable system for coastal environment
- RESULTS AND DISCUSSION :
Exposure to immersion in 3.5 % NaCl
Exposure to ASTM B117 (neutral salt spray)
ASTM G85 (Prohesion cabinet test)
ASTM D5894 (cyclic corrosion test)
Immersionin 10 % HS2O4 and NaOH
Service life prediction |
| DOI : |
10.1007/s11998-010-9299-5 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9299-5.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11361 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 2 (03/2011) . - p. 191-200
Aller sur edunet
Accueil
Service life prediction of organic coatings: electrochemical impedance spectroscopy vs actual service life in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 2 (03/2011)
