| Titre : |
Comparative performance of coating system on steel surface at laboratory and Chennai naval base environment |
| Type de document : |
texte imprimé |
| Auteurs : |
M. Selvaraj, Auteur ; M. Natesan, Auteur ; K. Maruthan, Auteur ; P. Jayakrishnan, Auteur |
| Année de publication : |
2003 |
| Article en page(s) : |
p. 49-54 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Maintenance coating systems viz. vinyl, epoxy - polyurethane and polyurethane were coated on wire brushed steel surface and exposed at Chennai naval base for 18 months and in a salt spray chamber for 720 hrs. After this duration, the panels were removed and subjected to impedance measurement studies in 0.5 M sodium chloride solution. The photographs of salt spray chamber exposed panels and those exposed in atmosphere indicate that the latter gets highly corroded when compared to the panels in the salt spray chamber. This is mainly due to the atmospheric corrodant present in the air in addition to the marine environment. The AC impedance measurement shows that the vinyl and epoxy-polyurethane coating system exhibited 109 ohm-cm2 resistance even after 720 hrs salt spray and a 18 month exposure at the navel base. But the resistance produced by the polyurethane system is in the order of 106 ohm-cm2 and 104 ohm.cm2, which shows comparatively poor protective property of this system. This study indicates that better correlation is possible between exposure studies and the electrochemical methods of evaluating the coating systems. The studies further conclude that vinyl and epoxy-polyurethane coating systems can be used as maintenance coating system for steel structures at the navel base environment in Chennai. |
| Note de contenu : |
- Experimental :
a. Epoxy-polyamide, urethane system
b. Vinyl polymer system
c. Polyurethane system
- Evaluation of the coating system :
1. Atmospheric exposure study
2. Salt spray accelerated test
3. Electrochemical A.C. impedance measurements
- Results and discussion : - Field exposures and salt spray
- Impedance measurement
|
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in PAINTINDIA > Vol. LIII, N° 12 (12/2003) . - p. 49-54
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