Designing self-stratifying coatings through the study of pigment migration / Shahdad Zahedi in SURFACE COATINGS INTERNATIONAL, Vol. 101.6 (12/2018 - 01/2019)  

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 101.6 (12/2018 - 01/2019) . - p. 288-293 Titre : Designing self-stratifying coatings through the study of pigment migration Type de document : texte imprimé Auteurs : Shahdad Zahedi, Auteur ; Davood Zaarei, Auteur ; Seyed Reza Ghaffarian, Auteur ; Maude Jimenez, Auteur Année de publication : 2018 Article en page(s) : p. 288-293 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact Dioxyde de titane Energie de surface Epoxydes Formulation (Génie chimique) Oxyde de fer Pigments inorganiques Revêtements autostratifiants Index. décimale : 667.9 Revêtements et enduits Résumé : Self-stratifying coatings are smart coatings which represent a new generation of surface coatings for industry which offer the advantages of single-coat application, thereby reducing resources and potential pollution when compared to conventinal multi-layer coating systems. In our work, the effect of pigments on stratification was studied. Ten formulations were made based on epoxy and fluorinated vinyl ether incorporation of inorganic pigments containing titanium dioxide and red iron oxide. Evaluations were made by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX) and mapping from cross-sections through the films. Results demonstrate that the affinity of the pigments for different resins, and also the quality of their dispersion and stabilisation in the initial phase, both play important roles in the stratification phenomena. Note de contenu : - Materials - Formulation and application - Results and discussion : Stratification of clear coatings - Stratification of single-pigment coatings - Stratification of dual-pigment coatings - Table 1 : Prepared formulations - Table 2 : Percentage of elements in top and bottom areas in cross-section of clear coating formulation (Formula 3) by EDX - Table 3 : Percentage of elements in top and bottom areas in cross-section of single-pigment formulations 4, 5, 7 and 8 by EDX - Table 4 : Stratification type by formulation - Table 5 : Percentage of elements in top and bottom areas in cross-section of single-pigment formulations 6, 9 and 10 by EDX - Table 6 : Contact angle measurement and surface energies (polar and dispersive components) of films by using three liquids (water, ethylene glycol and di-iodomethane) - Table 7 : Surface energy relations and stratification conditions - Fig. 1 : SEM and mapping images for SSC clear coating system (formula 3) - Fig. 2 : SEM and mapping images for single-pigment systems (formulations, 4, 5, 7 and 8) - Fig. 3 : SEM and mapping images for dual-pigment systems (formulations 6, 9, and 10) En ligne : https://drive.google.com/file/d/11o-EpvH5VXJK-GS1nC5NArN3pTtgN975/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31651 [article]

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Formulation and study of corrosion prevention behavior of epoxy cerium nitrate-montmorillonite nanocomposite coated carbon steel / E. Darmiani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 4 (07/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 4 (07/2013) . - p. 493-502 Titre : Formulation and study of corrosion prevention behavior of epoxy cerium nitrate-montmorillonite nanocomposite coated carbon steel Type de document : texte imprimé Auteurs : E. Darmiani, Auteur ; I. Danaee, Auteur ; G. R. Rashed, Auteur ; Davood Zaarei, Auteur Année de publication : 2013 Article en page(s) : p. 493-502 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Anticorrosifs Anticorrosion Epoxydes Matériaux hybrides Métaux -- Revêtements protecteurs Montmorillonite Nanoparticules Nitrate de cérium Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : Nanocomposite coatings which were applied on carbon steel panels based on epoxy cerium nitrate–montmorillonite (MMT) were synthesized and formulated. Nanoparticles were incorporated into epoxy resin by mechanical and sonication processes. The state of dispersion, dissolution, and incorporation were characterized by optical microscopy, sedimentation tests, X-ray diffraction, and transmission electron microscopy. To investigate anticorrosive properties of nanocomposite coatings, electrochemical impedance spectroscopy and salt spray tests were employed. The experimental results showed that epoxy cerium nitrate–MMT nanocomposite coatings were superior to the neat epoxy in corrosion protection effects. In addition, it was observed that the corrosion protection of nanocomposite coatings was improved as the clay loading was increased up to 4–2 wt% cerium nitrate. Note de contenu : - EXPERIMENTAL : Materials - Preparation of nanocomposites - Sample preparation - Laboratory - RESULTS AND DISCUSSION : Optical microscopy results - Stability - XRD and TEM analysis - Electrochemical impedance spectroscopy - Salt spray test DOI : 10.1007/s11998-012-9463-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9463-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19099 [article]

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A new approach to using submicron emeraldine-base polyaniline in corrosion-resistant epoxy coatings / Davood Zaarei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 1 (01/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 1 (01/2012) . - p. 47-57 Titre : A new approach to using submicron emeraldine-base polyaniline in corrosion-resistant epoxy coatings Type de document : texte imprimé Auteurs : Davood Zaarei, Auteur ; Ali Asghar Sarabi, Auteur ; Farhad Sharif, Auteur ; Mohsen Moazzami Gudarzi, Auteur ; Seyed Mahmoud Kassiriha, Auteur Année de publication : 2012 Article en page(s) : p. 47-57 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Corrosion Epoxydes Métaux -- Revêtements protecteurs Polyaniline Index. décimale : 667.9 Revêtements et enduits Résumé : The present work reports on a new approach to the preparation of special corrosion-resistant epoxy coatings. The aminic hardener of these coatings contained emeraldine-base polyaniline (EB-PANi). The aminic hardener was prepared by dispersion of EB-PANi in 3-(aminomethyl)-3,5,5-trimethylcyclohexan-1-amine employing sonication, centrifuging and submicron filtering methods. The state of dispersion and dissolution of these coating materials, during different stages of preparation, were characterized by optical microscopy and scanning electron microscopy. The corrosion resistances of resulting coatings were measured by electrochemical impedance spectroscopy (EIS) and salt spray methods. As little as 0.5% EB in initial mixture of EB-hardener compositions led to relatively better corrosion protection of resulting coating compared with neat resin coating. Presence of initial 2.5% of EB in the hardener and its processing through our approach resulted in the formulation of an epoxy coating with superior corrosion protection properties. Note de contenu : - EXPERIMENTAL : Materials - Hardener-EB preparation - Application of coatings on steel substrates - Characterization - RESULTS AND DISCUSSION : Introduction of EB into the hardener - Cured-coating characteristics - Corrosion resistivity of coatings by EIS DOI : 10.1007/s11998-011-9325-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-011-9325-2.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14354 [article]

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Self-stratifying coatings : a review / Shahdad Zahedi 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. 1-12 Titre : Self-stratifying coatings : a review Type de document : texte imprimé Auteurs : Shahdad Zahedi, Auteur ; Davood Zaarei, Auteur ; Seyed Reza Ghaffarian Année de publication : 2018 Article en page(s) : p. 1-12 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Antimicrobiens Chimie des surfaces Dioxyde de titane Pigments Revêtements antisalissures:Peinture antisalissures Revêtements autostratifiants:Peinture autostratifiante Revêtements organiques Séparation (technologie) Solubilité Index. décimale : 667.9 Revêtements et enduits Résumé : A self-stratifying coating is an economical coating containing multiresinous components with different functional groups, which spontaneously stratify after application to the substrate. These coating systems could be composed of two or more different layers to protect substrates against corrosion, by first layer, and simultaneously to create a desirable appearance, by second layer, with decorative properties. Conventional multilayer coating systems encounter some problems such as poor interfacial adhesion, application, and labor costs and also lengthy processing time. The concentration gradient of two layers would eliminate the inter-coating boundary which can be the point of failure in conventional coatings. In this paper, the surface tension and solubility theory regarding these coatings are discussed. In addition, the effects of different factors on the pigment location into the coating systems are studied. The main factors, including curing mechanisms, substrate effects, thickness, viscosity, kinetics of reaction, evaporation rate of solvents, dispersing agents, and surface properties of pigments have been reviewed. The models for prediction of self-stratifying coatings such as UNIFAC and computer simulation have also been addressed and taken into consideration. The prospect of these coatings and their application in different industries is presented. Note de contenu : - STRATIFICATION THEORIES : Phase separation/solubility parameter/density differences - Kinetics aspects (effect of evaporation rate on self-stratification)- Surface tension relations - RESEARCH TRENDS IN SELF-STRATIFYING COATINGS - PIGMENTED SELF-STRATIFYING COATINGS - MODELS FOR PREDICTION SELF-STRATIFICATION OF COATINGS : UNIFAC model - Surface energy variation with concentration of two polymers -Computer model for self-stratification - INDUSTRIAL APPLICATION OF SSC : Corrosion Resistance of SSC - Self-stratification in antimicrobial and antifouling coatings - EVALUATION METHODS FOR STRATIFICATON - NEW APPROCHES IN SSC DOI : 10.1007/s11998-017-9996-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9996-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30050 [article]

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Structure properties and corrosion resistivity of polymeric nanocomposites coatings based on layered silicates / Davood Zaarei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 2 (06/2008)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 5, N° 2 (06/2008) . - p. 241-249 Titre : Structure properties and corrosion resistivity of polymeric nanocomposites coatings based on layered silicates Type de document : texte imprimé Auteurs : Davood Zaarei, Auteur ; Ali Asghar Sarabi, Auteur ; F. Sharif ; Seid Mahmood Kassiriha Année de publication : 2008 Article en page(s) : p. 241-249 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Argile Conducteurs organiques Matériaux hybrides Montmorillonite Polyacrylonitrile Silicates Index. décimale : 667.9 Revêtements et enduits Résumé : This paper reviews the recent research and development of polymeric nanocomposite coatings based on layered silicates. In the past few decades, extensive research activities have been conducted on clay minerals due to their unique layered structure, rich intercalation chemistry and availability at low cost, environmental stability, and good processability. One of the most important categories of layered silicates is nanoclays. The nanoclay is considered as reinforcement for polymers in the manufacture of low-cost, lightweight and high performance nanocomposite coatings. In this paper, we try to introduce the structure, properties, and surface modification of clay minerals. Different properties of polymer clay nanocomposite coatings consisting of different polymers are also reviewed. These coatings may consist of conductive and nonconductive polymers. The corrosion resistance of each type is discussed separately. Some novel properties can be observed from the interaction of two dissimilar chemical components at the molecular level that posses enhancements in corrosion inhibition on metallic substrates. Finally, the prospective problems of industrial usage of these materials are mentioned. DOI : 10.1007/s11998-007-9065-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9065-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3000 [article]

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The effect of MIO pigments on corrosion resistance and adhesion of synthetic rubber-based primer / Hojatollah Erfaghi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 2 (03/2018)  

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