Rust morphology characterization of silicone-based marine antifouling paints after salt spray test on scribed specimens / E. D. Kiosidou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 2 (03/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 2 (03/2017) . - p. 333-345 Titre : Rust morphology characterization of silicone-based marine antifouling paints after salt spray test on scribed specimens Type de document : texte imprimé Auteurs : E. D. Kiosidou, Auteur ; A. Karantonis, Auteur ; D. I. Pantelis, Auteur ; E. R. Silva, Auteur ; J. C. M. Bordado, Auteur Année de publication : 2017 Article en page(s) : p. 333-345 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Diffractométrie de rayons X Essais de brouillard salin Marines (peinture) Microscopie électronique à balayage Revêtements antisalissures:Peinture antisalissures Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Spectroscopie Raman Index. décimale : 667.9 Revêtements et enduits Résumé : A newly developed, silicone-based, marine antifouling coating, containing 0.56% immobilized Econea, was examined in terms of its anticorrosion performance. The novelty of the experimental formulation arises from the immobilization of the biocide which minimizes leaching and was accomplished via a newly developed functionalization method, based on reaction of the biocide with highly reactive isocyanate functionality. The painting system was applied on steel specimens, then scribed with a sharp cutter and examined for 12 weeks in cyclic salt spray exposure. Identification of the rust morphologies was done with XRD, Raman spectroscopy, SEM and EDS methods. The observed paint swelling during the experiment caused the formation of large, coarse rust agglomerates without adherence, which detached frequently causing reinitiation of the corrosion process. This procedure was revealed by the oxyhydroxide nature of the corrosion products. The basic corrosion morphology observed was a mixture of akaganeite and goethite. A commercial, silicone-based, foul-release coating served as a reference. The experimental formulation exhibited superior anticorrosion performance overall, since the reference system presented higher enlargement of the scribed areas, increased substrate material loss, a highly inhomogeneous corrosion layer with voids and smaller (stable) goethite amounts in the rust areas containing mainly akaganeite/goethite mixture. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Coating systems examined - Accelerated aging tests on scribed specimens - SEM, XRD and Raman examination of rust samples - RESULTS AND DISCUSSION : Observation of the scribed areas - XRD examination of rust samples - Raman spectra identification of rust samples - Identification of rust morphologies - Correlation of the observed rust morphologies with paint efficiency DOI : 10.1007/s11998-016-9851-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9851-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28149 [article]

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