Nano-silica-containing acrylic polyurethane and acrylic-polyester hybrid polyurethane coatings for direct-to-metal (DTM) coating applications – a comparative study / Sukanya Gangopadhyay in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 6 (11/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 6 (11/2022) . - p. 1773-1786 Titre : Nano-silica-containing acrylic polyurethane and acrylic-polyester hybrid polyurethane coatings for direct-to-metal (DTM) coating applications – a comparative study Type de document : texte imprimé Auteurs : Sukanya Gangopadhyay, Auteur ; Prakash A. Mahanwar, Auteur Année de publication : 2022 Article en page(s) : p. 1773-1786 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Application directe sur le métal Chimie analytique Copolymère ester acrylique Copolymère uréthane acrylique Formulation (Génie chimique) Matériaux hybrides Nanoparticules Résistance aux conditions climatiques Résistance chimique Revêtements -- Propriétés mécaniques Revêtements -- Propriétés optiques Revêtements organiques Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Index. décimale : 667.9 Revêtements et enduits Résumé : In the era of sustainability, direct-to-metal coatings have proven to be a promising solution as it eliminates the need for underneath primer coating layers. In the present study, two coating systems, viz. acrylic polyurethane and acrylic-polyester hybrid polyurethane nano-composite coatings, were prepared by addition of nano-silica in various loadings for direct-to-metal coating applications. The addition of nano-silica along with selected resin systems enables to meet desired mechanical properties, chemical resistance along with weathering and corrosion resistance of DTM coating system. Incredible improvement in the overall mechanical properties of the coating including pencil hardness and scratch resistance has been observed by the addition of nano-silica. SEM technique was employed to evaluate the nano-silica dispersion into the coating system along with its morphology. SEM studies revealed thorough dispersion of the nanoparticles within the coating matrix for both the coating systems. Thermal properties were studied by thermogravimetric analysis along with structural characterization by Fourier transform infrared spectroscopy. Thermal stability of both the coating systems increased with the addition of nano-silica; however, acrylic-polyester hybrid polyurethane coatings revealed better thermal stability at 8% nano-silica loading. Color and gloss changes were studied before and after 500 h exposure to a QUV chamber. Anticorrosive properties were evaluated by salt spray exposure for 700 h. At 8% nano-silica loading, acrylic-polyester hybrid polyurethane coatings revealed better weathering performance along with anticorrosive properties and chemical resistance owing to the presence of hybrid polymer chains. Note de contenu : - EXPERIMENTAL : Materials - Preparation of nano-composite DTM coating - polyurethane (PPT) nano-composite DTM coating - Application - Coating characterization - RESULTS AND DISCUSSION : Fourier transfer infrared spectroscopy (FTIR) analysis - Mechanical properties of coating formulations - Scanning electron microscopy (SEM) - Thermogravimetric analysis (TGA) of coatings - Chemical resistance of APT and PPT coatings - Optical properties - Corrosion and weathering resistance - Table 1 : Formulations of acrylic polyurethane (APT) nano-composite DTM coating - Table 2 : Formulations of acrylic-polyester hybrid - Table 3 : Mechanical properties of APT and PPT coatings at various nano-silica loadings - Table 4 : TGA of acrylic polyurethane (APT) DTM coating - Table 5 : TGA of acrylic-polyester hybrid polyurethane (PPT) DTM coating - Table 6 : Chemical resistance properties of APT and PPT coating systems at various nano-silica loading - Table 7 : Gloss reading at 60° inclination for APT and PPT coating systems at various nano-silica loading - Table 8 : Gloss measured 60° inclination before and after weathering test at various nano-silica loadings for APT and PPT coatings - Table 9 : Color changes (ΔE values) of specimens (APT and PPT coatings) before and after the QUV chamber exposure test DOI : https://doi.org/10.1007/s11998-022-00647-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00647-5.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38496 [article]

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Recent developments in the volatile corrosion inhibitor (VCI) coatings for metal : a review / Sukanya Gangopadhyay in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 4 (07/2018) . - p. 789-807 Titre : Recent developments in the volatile corrosion inhibitor (VCI) coatings for metal : a review Type de document : texte imprimé Auteurs : Sukanya Gangopadhyay, Auteur ; Prakash A. Mahanwar, Auteur Année de publication : 2018 Article en page(s) : p. 789-807 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Essais (technologie) Inhibiteurs de corrosion volatils Métaux -- Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Corrosion is a crucial worldwide problem that strongly affects metals. Out of the several ways to prevent corrosion, volatile corrosion inhibitors (VCIs) are predominantly used as a method of temporary protection. These compounds have the ability to vaporize and condense on the surface of the ferrous or nonferrous material and make the substrate less susceptible to corrosion but work only in a confined space. VCI compounds form a monomolecular layer over the metal surface, thereby preventing the electrochemical reactions on the metal surface which lead to corrosion. This review article outlines the use of volatile corrosion inhibitors (VCIs) as a temporary corrosion protection technique, their working mechanisms and the various compounds used as VCI. It also anchors on the latest research works which have been carried out on VCI coatings along with a glimpse of the works that were carried out in the past. The various factors affecting the volatile corrosion inhibitors along with the merits of VCI coatings are discussed in this paper. Formulations for both strippable and permanent VCI coatings are also reported with the various testing methods. Lastly, an overview of the recent developments of VCI coatings along with the various green VCI is given. Note de contenu : - INTRODUCTION : Volatile corrosion inhibitors - LITERATURE REVIEW : Volatile corrosion inhibitors (VCIs) - Cost of corrosion : market survey - Volatile corrosion inhibitor (VCI) compounds - Various forms of VCI compounds - VCI working mechanism - Effectiveness and factors affecting volatile corrosion inhibitors - Adherence of VCI coating - Merits of volatile corrosion inhibitor coatings - Volatile corrosion inhibitor (VCI) - TYpes of volatile corrosion inhibitor coating - Mode of application of VCI coating - Green volatile corrosion inhibitors - Testing methods for VCI coatings - Future trends in VCI coatings DOI : 10.1007/s11998-017-0015-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0015-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30857 [article]

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