Water transportation through organic coatings : correlation between electrochemical impedance measurements, gravimetry, and water vapor permeability / Subrahmanya Shreepathi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 4 (07/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 4 (07/2012) . - p. 411-422 Titre : Water transportation through organic coatings : correlation between electrochemical impedance measurements, gravimetry, and water vapor permeability Type de document : texte imprimé Auteurs : Subrahmanya Shreepathi, Auteur ; Shrikant M. Naik, Auteur ; Mohan Rao Vattipalli, Auteur Année de publication : 2012 Article en page(s) : p. 411-422 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Humidité -- Absorption Infiltration Perméabilité Revêtements -- Effets de l'humidité Revêtements organiques Spectroscopie d'impédance électrochimique Vapeur d'eau Index. décimale : 667.9 Revêtements et enduits Résumé : A primary cause of coating failure is diffusion of water through organic coatings during which many corrosive species are transported to the metal-coating interface. However, water vapor permeability through the coating improves blister resistance to a certain extent. The present work describes the influence of chemical nature of the polymer on the above two properties. Attempts were also made to establish a correlation between these two properties for pigmented organic coating. Six paints were formulated and processed using six different types of binders at a constant pigment volume concentration (PVC) and specific gravity. Water ingress, water vapor permeability, and water absorption of these coatings were estimated using electrochemical impedance measurements (EIS), permeability cup method, and gravimetric method, respectively. There exists a good linear correlation between water uptake measured by EIS and water absorption measured by gravimetry. Similarly, a correlation was also noticed between water uptake by EIS and water vapor permeability. However, polyurethane type polymers did not fit into this linear correlation. Furthermore, influence of the resin chemistry on anticorrosive properties of these coatings was also studied using EIS and salt spray exposure test. Among all polymers under investigation, acrylic polyol-based polyurethane has shown the lowest water uptake, higher impedance, better salt spray resistance but higher water vapor transmission rate. Note de contenu : - EXPERIMENTAL : Materials and reagents - Processing of paints - Characterization - RESULTS AND DISCUSSION : Water uptake by EIS - Water vapor permeability - Water absorption measurements - Role of resin on corrosion protection performance - Salt spray exposure studies DOI : 10.1007/s11998-011-9376-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9376-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15992 [article]

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