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Micro and macro analysis of high build solventless organic coating (accelerated) after cathodic disbondment / Buddhadeb Duari in PAINTINDIA, Vol. LXII, N° 12 (12/2012)
[article]
Titre : Micro and macro analysis of high build solventless organic coating (accelerated) after cathodic disbondment Type de document : texte imprimé Auteurs : Buddhadeb Duari, Auteur ; Rajib Dey, Auteur ; Bimal Chaudhuri, Auteur ; Amitava Pal, Auteur Année de publication : 2012 Article en page(s) : p. 62-64 Langues : Anglais (eng) Catégories : Anticorrosion
Décollement cathodique (revêtement)
Essais (technologie)
Essais accélérés (technologie)
Essais de brouillard salin
Revêtements -- Détérioration
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Different organic coating material vis high build epoxy, coal tar epoxy, polyurethane, glass flake epoxy, concrete coating, cold dip galvanizing applied on steel plate are subjected to salt spray test as per ASTO B117 for 2000 hrs and then cathodic disbondment test as per ASTM G8. Further metal beneath cathodic disbondment (caused due to blistering) are under microscope to find out type of corrosion and list them from minimum to worst. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17171
in PAINTINDIA > Vol. LXII, N° 12 (12/2012) . - p. 62-64[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14545 - Périodique Bibliothèque principale Documentaires Disponible Migration of reactable UVAs and HALS in automotive plastic coatings / Philip V. Yannef in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 1, N° 3 (07/2004)
[article]
Titre : Migration of reactable UVAs and HALS in automotive plastic coatings Type de document : texte imprimé Auteurs : Philip V. Yannef, Auteur ; Mouhcine Kanouni, Auteur ; Nancy Cliff, Auteur ; Karlis Adamsons, Auteur Année de publication : 2004 Article en page(s) : p. 201-212 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Copolymère mélamine-Formaldéhyde
Durée de vie (Ingénierie)
Essais accélérés (technologie)
Haut extrait sec
Organosilanes
Prévision, Théorie de la
Revêtement en plastique
Silanes
Stabilisant à la lumière de type amine encombrée
Stabilisants à la lumière
Surfaces -- AnalyseTags : Stabilisants à la lumièreanalyse de surfacerésines mélamine-formaldéhydeorganosilaneessais accélérésprévision durée vieplumeautomobile - OEMmélamine haute teneur en solidessilaneles plastiques Index. décimale : 667.9 Revêtements et enduits Résumé : Loss of light stabilizers from automotive finishes can significantly reduce the durability of coatings on plastic substrates. Minimizing movement by retaining the stabilizers in the targeted layer can greatly improve coating longevity. This article examines the migratory patterns of a series of traditional UVA and HALS additives in fully formulated 1K silane crosslinked coatings applied over both plastic and steel substrates, comparing their migratory patterns to that of reactable light stabilizers containing hydroxyl functionality. Analysis of the coating layers with the various UVAs and HALS revealed that functionalization of the light stabilizer with reactable hydroxy groups can prevent migration into the plastic; whereas nonreactable light stabilizers migrate into lower coating system layers and even into the plastic substrate. The greatest extent of migration does not occur during initial cure of the wet coating, but during exposure. Significant depletion of the nonreactable light stabilizers from the topcoat occurs as early as 1500 hours of Xenon boro/boro exposure. DOI : 10.1007/s11998-004-0013-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0013-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3900
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 1, N° 3 (07/2004) . - p. 201-212[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000587 - Périodique Bibliothèque principale Documentaires Disponible Model-based analysis of photoinitiated coating degradation under artificial exposure conditions / Søren Kiil in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 4 (07/2012)
[article]
Titre : Model-based analysis of photoinitiated coating degradation under artificial exposure conditions Type de document : texte imprimé Auteurs : Søren Kiil, Auteur Année de publication : 2012 Article en page(s) : p. 375-398 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amines Une amine est un composé organique dérivé de l'ammoniac dont certains hydrogènes ont été remplacés par un groupement carboné. Si l'un des carbones liés à l'atome d'azote fait partie d'un groupement carbonyle, la molécule appartient à la famille des amides. Découvertes en 1849, par Wurtz les amines furent initialement appelées alcaloïdes artificiels.
On parle d'amine primaire, secondaire ou tertiaire selon que l'on a un, deux ou trois hydrogènes substitués.
Par exemple, la triméthylamine est une amine tertiaire, de formule N(CH3)3.
Typiquement, les amines sont obtenues par alkylation d'amines de rang inférieur. En alkylant l'ammoniac, on obtient des amines primaires, qui peuvent être alkylées en amines secondaires puis amines tertiaires. L'alkylation de ces dernières permet d'obtenir des sels d'ammonium quaternaire.
D'autre méthodes existent : 1. Les amines primaires peuvent être obtenues par réduction d'un groupement azoture, 2. Les amines peuvent aussi être obtenues par la réduction d'un amide, à l'aide d'un hydrure, 3. L'amination réductrice permet l'obtention d'amines substituées à partir de composés carbonylés (aldéhydes ou cétones), 4. Les amines primaires peuvent être obtenues par la réaction de Gabriel.
Epoxydes
Essais accélérés (technologie)
Revêtements -- Détérioration
Revêtements -- Effets de l'humidité
Revêtements -- Effets du rayonnement ultraviolet
ThermodurcissablesIndex. décimale : 667.9 Revêtements et enduits Résumé : Coating degradation mechanisms of thermoset coatings exposed to ultraviolet radiation and humidity at constant temperature are investigated. The essential processes, photoinitiated oxidation reactions, intrafilm oxygen permeability, water absorption and diffusion, reduction of crosslink density, and development of a thin surface oxidation zone are quantified and a mathematical model for degrading coatings developed. Front-tracking techniques are used to determine the rate of movement of the oxidation and ablation fronts, the positions of which define the extension of the surface oxidation zone. Three previous and independent experimental investigations with two-component, densely crosslinked, epoxy–amine model coatings were selected for verification of the mathematical model. Simulations can match and explain transient mass loss and coating thickness reduction data and are in agreement with infrared measurements of carbonyl groups formed in the surface zone. The thickness of the stable surface oxidation zone, which is established after an initial ablation lag time, is estimated by the model to 0.5–2 μm in good agreement with previous measurements. Simulated concentration profiles of active groups, oxygen, and radicals in the stable surface oxidation zone are presented and analyzed. The mathematical model can be used for obtaining a quantitative insight into the degradation of thermoset coatings and has potential, after further development, to complete commercial coatings and dynamic exposure conditions, to become a supplementing tool for predicting in-service coating behavior based on accelerated laboratory measurements. Note de contenu : - INTRODUCTION : Quantification of rate phenomena and mathematical model
- PREVIOUS MATHEMATICAL MODELS OF COATING DEGRADATION
- OUTLINE OF RELEVANT EPOXY-AMINE DEGRADATION MECHANISM : Mechanism of photoinitiated oxidative degradation of epoxy-amine networks - Chemical kinetics
- MECHANISMS OF COATING DEGRADATION
- MATHEMATICAL MODELING : Moving ablation front - Moving oxidation front - Transmission of UV light - Balance for crosslink density and CC groups - Local conversion of crosslinks - Mass balance for nonvolatile compounds - Porosity in the oxidation zone - Mass balance for oxygen - Mass balance for liquid water - Coating weight loss - Heat balance - Crosslink density - Initial concentrations of active groups - Glass transition temperature - Numerical solution procedure
- ESTIMATION OF MODEL PARAMETERS
- RESULTS AND DISCUSSION : Model verification using the data of Nguyen et al. (clearcoat) - Evaluation of adjustable parameters used - Model verification using the data of Nguyen et al. (nanopigmented systems) - Concentration profile in the oxidation zone and entire coating - Model verification using the data of Rezig et al. (clearcoat) - Model verification using the data of Guillot et al (clearcoat) - Sensitivity analysis - Analysis of rate phenomena potentially incluencing the oxidation zone thickness - Natural exposure vs artificial exposure
- VALIDATION OF MODEL ASSUMPTIONSDOI : 10.1007/s11998-011-9383-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9383-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15990
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 4 (07/2012) . - p. 375-398[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14189 - Périodique Bibliothèque principale Documentaires Disponible Modes and mechanisms for the degradation of fusion-bonded epoxy-coated steel in a marine concrete environment / Tinh Nguyen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 1, N° 2 (04/2004)
[article]
Titre : Modes and mechanisms for the degradation of fusion-bonded epoxy-coated steel in a marine concrete environment Type de document : texte imprimé Auteurs : Tinh Nguyen, Auteur ; Jonathan W. Martin, Auteur Année de publication : 2004 Article en page(s) : p. 81-92 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.
Adhésion
Anticorrosifs
Anticorrosion
Barres d'armature
Béton renforcé de fibres
Corrosion
Epoxydes
Essais accélérés (technologie)
Métaux -- Revêtements protecteurs
Revêtement époxy lié par fusionIndex. décimale : 667.9 Revêtements et enduits Résumé : Fusion-bonded epoxy is used extensively to protect steel reinforcing bars from corrosion. This coating has proven to be a cost-effective material for increasing the service life of reinforced concrete structures. However, field observations have reported premature corrosion of fusion-banded epoxy-coated reinforcing bars used in marine concrete environments, leading to severe cracking and spalling of the reinforced concretes. This study was initiated to provide a better understanding of the modes and mechanisms of the corrosion of fusion-bonded epoxy-coated steel exposed in a marine concrete environment. Grit-blasted steel panels were coated with two commercial fusion-bonded powder epoxy coatings at two thicknesses. Half of the coated panels were scribed, the other half were non-scribed. The panels were immersed in a saturated calcium hydroxide aqueous solution containing 0.6 mole/liter sodium chloride maintained at either 35°C or 50°C. Degradation was characterized and followed by infrared thermography wet adhesion, and microscopic and analytical chemical techniques. Unscribed panels exhibited only water-induced adhesion loss, most of which was recovered after drying. However, in addition to the water-induced adhesion loss, scribed panels exhibited two modes of failure: anodic blistering near the scribe mark and cathodic delamination around the anodic blisters. Anodic blistering was attributed to localized crevice corrosion under the coating followed by blistering via an osmotic pressure mechanism. Cathodic delamination was probably induced by the alkaline cathodic reaction products, and water-induced adhesion loss was due to the presence of a water layer at the coating/steel interface. DOI : 10.1007/s11998-004-0002-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0002-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3953
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 1, N° 2 (04/2004) . - p. 81-92[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000586 - Périodique Bibliothèque principale Documentaires Disponible Modification of styrene-acrylic emulsion by organic UV absorber in synergy with fluorine and silicon monomers for weatherable coatings / Wei Dong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)
[article]
Titre : Modification of styrene-acrylic emulsion by organic UV absorber in synergy with fluorine and silicon monomers for weatherable coatings Type de document : texte imprimé Auteurs : Wei Dong, Auteur ; Lei Zhou, Auteur ; Yanni Guo, Auteur ; Yining Tang, Auteur ; Rong Pan, Auteur ; Mengli Liu, Auteur ; Deliang He, Auteur Année de publication : 2022 Article en page(s) : p. 607-616 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Benzotriazole
Caractérisation
Copolymère styrène acrylique
Copolymères en émulsion
Enrobage (technologie)
Essais accélérés (technologie)
Fluorure de silicium
Formulation (Génie chimique)
Polymérisation en émulsion
Potentiel zeta
Rayonnement ultraviolet -- Absorption
Résistance aux conditions climatiques
Revêtements organiques
Stabilité thermiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : To improve the weather ability and thermal stability of styrene-acrylic polymer emulsion coatings, a series of novel styrene-acrylic polymer emulsion modified with 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl]-2H-benzotriazole (HMEB), hexafluorobutyl methacrylate (HFMA), and vinyl-trimethoxysilane (VTMS) were prepared through semi-continuous seed emulsion polymerization. The emulsions and their coatings were characterized by Fourier transform infrared spectroscopy, ultraviolet absorption spectroscopy (UV-Vis), X-ray photoelectron spectroscopy, dynamic laser scattering, transmission electron microscopy, zeta potential, thermogravimetric analysis, and artificially accelerated aging test. According to the results, the new polymer emulsion had superior UV absorption from 308 to 364 nm. Moreover, the coating performed the best anti-aging stability when the content of HMEB, HFMA, and VTMS reached 4%, 2%, and 3%, respectively. After the 1000 h aging test, the color difference (ΔE) and rate of loss of gloss (ΔG) were only 6.86% and 51.10%, while the unmodified coatings were 16.05% and 72.22%, respectively. Furthermore, the thermal stability and water resistance of the coating were improved by fluorine and silicon monomers. The initial decomposition temperature was increased from 327 to 339°C. Moreover, the UV stabilization mechanism is preliminarily discussed. Note de contenu : - EXPERIMENTAL : Materials - Pre-emulsification - Emulsion polymerization - Coating preparation - Characterization
- RESULTS AND DISCUSSION : Basic properties of emulsions and the coatings - Zeta potential and DLS of emulsions - Morphology of emulsion particles - Chemical structure of emulsion polymer - Chemical composition of emulsion coatings - UV absorption property of coatings - Thermal stability of emulsion coating - The aging acceleration test of emulsion coatings - Protective properties of emulsion coatings
- Table 1 : Emulsion polymerization formula
- Table 2 : Basic properties of emulsions and the coatings
- Table 3 : Surface composition of different coatings/atomic %DOI : https://doi.org/10.1007/s11998-021-00550-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00550-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37291
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 2 (03/2022) . - p. 607-616[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23408 - Périodique Bibliothèque principale Documentaires Disponible Modified acrylic core-shell / Alann de Oliveira Piagentini Bragatto in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 206, N° 4619 (04/2016)
PermalinkMolecular relaxation phenomena during accelerated weathering of a polyurethane coating / B. M. Dilhan Fernando in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 1 (03/2008)
PermalinkPermalinkMonitoring of injection molding tool corrosion and effects of wood plastic compound's moisture on material properties / E. Steidl in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 1 (03/2018)
PermalinkPermalinkMoving beyond the 25-year coating / Todd Williams in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 12 (12/2017)
PermalinkNanoparticles for UV protection of clear wood coatings - field and laboratory trials / Stig L. Bardage in SURFACE COATINGS INTERNATIONAL, Vol. 96, 2 (04/2013)
PermalinkNatural and accelerated weathering testing. The right choice / Smrithi Kumar in PAINTINDIA, Vol. LVIII, N° 4 (04/2008)
PermalinkNatural weathering performance and the effect of light stabilizers in water-based coating formulations on resin-modified and dye-stained beech-wood / Bodo Caspar Kielmann in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 6 (11/2016)
PermalinkNew era in corrosion testing / Sean Fowler in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 204, N° 4598 (07/2014)
PermalinkNew D-Iso/NPG gelcoat offers exceptional UV colour stability / Dean Bugg in JEC COMPOSITES MAGAZINE, N° 67 (08-09/2011)
PermalinkA new pigment for smart anticorrosive coatings / C. Deyà in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 2 (06/2007)
PermalinkNew silane-terminated polymers for sealants and adhesives / Lars Lander in ADHESION - ADHESIVES + SEALANTS, Vol. 15, N° 2/2018 (2018)
PermalinkA new test method for weatherability prediction by using a remote plasma reactor / M. Akahori in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B2 (06/2006)
PermalinkNew UV-curing wood coatings for exterior applications / Stefan Friebel in EUROPEAN COATINGS JOURNAL (ECJ), N° 1-2/01 (01-02/2001)
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