Evaluation of the anticorrosive behaviour of organic coatings applied on galvanised steel surfaces / N. Kouloumbi in SURFACE COATINGS INTERNATIONAL, Vol. 81, N° 1 (01/1998)

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 81, N° 1 (01/1998) . - p. 30-36 Titre : Evaluation of the anticorrosive behaviour of organic coatings applied on galvanised steel surfaces Type de document : texte imprimé Auteurs : N. Kouloumbi, Auteur ; G. M. Tsangaris, Auteur ; S. Nitodas, Auteur ; S. Kyvelidis, Auteur Année de publication : 1998 Article en page(s) : p. 30-36 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Peinture  anticorrosion'  'Protection  corrosion'  'Acier  galvanisé'  'Evaluation  performance' Index. décimale : 667.9 Revêtements et enduits Résumé : The study of the anticorrosive behaviour of the four systems of organic coatings — two with coal tar epoxy layer and two with zinc rich epoxy layer and external coating with epoxy paint — which were applied to galvanised steel specimens and were exposed to NaCl solution leads to the following conclusions : – All four systems investigated provide higher protection than simple galvanising during the exposure time of the present work, exhibiting corrosion current densities lower than those of the uncoated galvanised steel even after 4 months of exposure. – The systems comprising coal tar epoxy demonstrate higher anticorrosive protection than the systems with zinc rich epoxy and external coating with epoxy paint. The former maintain lower corrosion curent densities, almost constant phase angle (80°–85°) in the whole frequency range of the measurements, and high values of coating resistance, resistance of pores, and exponent of the CPE of the bulk of the coating. These elements indicate a homogeneous and resistant system with no considerable change of its electrical characteristics which retains its capacitive behaviour, a fact which is also verified by the slight increase in the water uptake(%v) and by the visual observations. On the contrary, the latter demonstrate higher corrosion curent densities, a step-by-step decrease of the phase angle, a significant reduction of the coating resistance, the resistance of pores and the exponent of CPE, and the increase in the constant of CPE, clues which characterize non-homogeneous materials where an increased penetration of polar water molecules occurs. This is also confirmed by the tendency for an increased water uptake, the high values of dielectric losses and the appearance of conductive pathways. – Independent of the coating system, the existence of a wash primer layer leads to an increase of the anticorrosive protection. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16465 [article]

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Reinforcement effects of multiwall carbon nanotubes and graphene oxide on PDMS marine coatings / Levent Cavas in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 1 (01/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 1 (01/2018) . - p. 105–120 Titre : Reinforcement effects of multiwall carbon nanotubes and graphene oxide on PDMS marine coatings Type de document : texte imprimé Auteurs : Levent Cavas, Auteur ; Pelin Gokfiliz Yildiz, Auteur ; Paraskevi Mimigianni ; Andreas Sapalidis ; S. Nitodas Année de publication : 2018 Article en page(s) : p. 105–120 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Marines (peinture) Oxyde de graphène Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques Index. décimale : 667.9 Revêtements et enduits Résumé : Poly (dimethyl siloxane) (PDMS) is a model silicon elastomer used as marine fouling-release coating, because it meets the fouling-release zone conditions of the Baier curve. However, weak mechanical properties limit its use. In this aspect, incorporation of carbon nanoparticles into PDMS is a common method for improving its mechanical properties. Since effective dispersion of nanofillers into polymer matrices is a challenge, a major aim of this study was to examine the PDMS mechanical reinforcement by developing different dispersing methods of pristine MWCNTs into PDMS matrix. SEM images of nanocomposites prepared using dispersion methods 1 and 2 revealed the formation of aggregates which subsequently affected the overall mechanical performance of the samples. Also, the effect of p-MWCNTs content and nanoparticle type [carboxyl-functionalized-MWCNTs, graphene oxide (GO)] on the mechanical properties of the nanocomposites was evaluated. Incorporation of p-MWCNTs did not alter drastically the critical surface energy value of neat PDMS, which subsequently influenced antifouling and cleaning performance of nanoreinforced coatings. To evaluate antifouling and cleaning performance of the nanocomposite coatings, seawater immersion tests were conducted. In conclusion, MWCNTs and GO increased the mechanical strength of the matrix, whereas they contributed to a small extent to the improvement in antifouling and cleaning performance of the composites. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS :Materials - Dispersion methods - Tensile testing of PDMS composites with carbon nanoparticles - Characterization of surfaces - Carbon nanoparticles-filled PDMS marine nanocoatings - Seawater immersion tests - RESULTS AND DISCUSSION : The effect of dispersion methods - Reinforcement effect of carbon nanoparticles on PDMS - Seawater immersion test DOI : 10.1007/s11998-017-9956-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9956-z.pdf Format de la ressource électronique : pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30090 [article]

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