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Concurrent physical aging and degradation of crosslinked coating systems in accelerated weathering / Shi Xiaodong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 3 (09/2008)
[article]
Titre : Concurrent physical aging and degradation of crosslinked coating systems in accelerated weathering Type de document : texte imprimé Auteurs : Shi Xiaodong, Auteur ; B. M. Dilhan Fernando, Auteur ; Stuart G. Croll, Auteur Année de publication : 2008 Article en page(s) : p. 299-309 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais accélérés (technologie)
Revêtements -- Détérioration:Peinture -- DétériorationIndex. décimale : 667.9 Revêtements et enduits Résumé : Coating degradation is a combination of both chemical and physical processes; however, physical processes have not received much attention. Physical aging has a non-negligible effect on coatings’ mechanical properties and permeability etc. through the densification that continues as a polymer approaches its thermodynamic equilibrium below the glass transition temperature, T g. Observations in recent work showed that physical aging affects coatings’ mechanical property response during accelerated weathering and is, itself, affected by the associated chemical degradation. Two crosslinked coating systems were studied in order to compare different chemical compositions, their T g, and their thermal response in accelerated weathering. During thermal cycling, physical aging measured by enthalpy recovery exhibited different trends in the two coatings. A “rejuvenation” mechanism was observed in the coating with a T g between the top and bottom limits of the exposure cycle; continued aging was observed for the coating with a high T g. Stress relaxation tests detected aging and “memory” behavior over periods comparable with accelerated weathering cycles. Both thermal and mechanical responses changed in complicated and different ways as the coatings degraded. Different degrees of coating thickness reduction were observed in both isothermal relaxation and degradation. When various coatings are evaluated, simply judging their performance under the same weathering environment is not reliable since polymer relaxation behavior depends on the relationship between the exposure temperatures and the T g of each polymer. DOI : 10.1007/s11998-008-9081-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9081-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2974
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Code-barres Cote Support Localisation Section Disponibilité 010633 - Périodique Bibliothèque principale Documentaires Disponible Conservation concerns for acrylic emulsion paint coatings / M. Veeramani in PAINTINDIA, Vol. LXXII, N° 5 (05/2022)
[article]
Titre : Conservation concerns for acrylic emulsion paint coatings Type de document : texte imprimé Auteurs : M. Veeramani, Auteur Année de publication : 2022 Article en page(s) : p. 92-94 Langues : Anglais (eng) Catégories : Décoloration
Formation de film
Jaunissement (défaut)
Oxydation
Pigments
Polyacryliques
Porosité
Réticulation (polymérisation)
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements en phase aqueuse:Peinture en phase aqueuse
Revêtements organiquesIndex. décimale : 667.6 Peintures Résumé : The basic process of film coalescence has been described frequently in the conservation and paint industry literature, though technologists acknowledge the over-simplification of this model and the need for further research. Acrylic emulsions are composed of particles of amorphous polymer suspended in water. The two-phased system is held in suspension by surfactants and/or other surface stabilisers. During drying, water evaporates to draw the spherical polymer particles Gloser, which then meld together to form a 'honeycomb' network. A coalescing-solvent additive ensures that the polymer particles remain malleable during — and after— this process, to produce more complete compaction, even after the water has evaporated. Eventually, the boundaries between particles become barely detectable and the film is considered continuous. However, it has been shown that pores or micro-voids are often left within the film, readily seen with light microscopy and SEM. minimum film formation temperature (MFT), modulus of elasticity and viscosity of the resin, as well as the function of additives such as coalescing agents. Paints left to dry slightly below their Tg and MFT wi II result in films of h igher porosity. A paint drying significantly below its Tg will form a loose, powdery layer.
Note de contenu : - Paint properties - Film formation
- Film porosity and pin-holes
- Haziness
- Thermo plasticity
- Properties of additives
- Ageing properties : Yellowing/discoloration
- Cross-linking and oxidation
- Effect of pigments
- Affinity for dirt pick-up
- Sensitivity to solvent
- Sensitivity to waterEn ligne : https://drive.google.com/file/d/1Zo1kAgDw2np8uJc2u-Jrs-MIHqjfEewS/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37803
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Code-barres Cote Support Localisation Section Disponibilité 23454 - Périodique Bibliothèque principale Documentaires Disponible Considerations for characterizing moisture effects in coatings weathering studies / Henry K. Hardcastle in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 2 (06/2008)
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Titre : Considerations for characterizing moisture effects in coatings weathering studies Type de document : texte imprimé Auteurs : Henry K. Hardcastle, Auteur ; William L. Meeks, Auteur Année de publication : 2008 Article en page(s) : p. 181-192 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Revêtements
Brillance (optique)
Corrosion par érosion
Essais accélérés (technologie)
Revêtements -- Détérioration
Revêtements -- Effets de l'humiditéIndex. décimale : 667.9 Revêtements et enduits Résumé : This article investigates the effects of weathering factors on moisture absorption of coatings and presents results from several projects including real-time and accelerated weathering studies of coatings moisture absorption. Moisture variable characteristics, observed in outdoor exposure environments, are reviewed. Data are presented from the experiments performed in end-use and accelerated weathering environments to characterize moisture characteristics on coatings. The information from natural outdoor environment characterizations and design of experiments (DOEs) indicates the new approaches for characterizing coatings weathering with regard to moisture effects. Considerations and new approaches for performing coating weathering studies are discussed. DOI : 10.1007/s11998-007-9078-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-007-9078-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2995
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Code-barres Cote Support Localisation Section Disponibilité 010394 - Périodique Bibliothèque principale Documentaires Disponible Corrosion domesticated and in the wild / Carl Reed in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 2 (02/2017)
[article]
Titre : Corrosion domesticated and in the wild Type de document : texte imprimé Auteurs : Carl Reed, Auteur ; Kat Coronado, Auteur Année de publication : 2017 Article en page(s) : p. 46-53 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
Essais accélérés (technologie)
Etudes comparatives
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements organiquesIndex. décimale : 620.11 Matériaux (propriétés, résistance) Résumé : This article examines the four predominant sources of corrosion that occur “in the wild” and compares them to observational results found in exposure to accelerated corrosion conditions. By combining these observational attributes to mechanistic attributes previously examined, the use of accelerated corrosion testing can be better used as an indicator of how a coating will perform in various environmental conditions. Note de contenu : - MECHANISMS OF CORROSION ON STEEL COATED WITH ORGANIC COATINGS : Anodic : Fe -> Fe++ + 2e (oxidation), Cathodic : 2H2O+O + 4e -> 4OH (reduction) - Fe + 2H+ -> Fe++ + H2
- CORROSION CAUSATION AND EFFECTS : Erosion-induced corrosion - Damage-induced corrosion - Conductive-pathway-induced corrosion - Contamination-induced corrosion
- FIGURES : 1. Mechanism of corrosion in a neutral or alkaline environment. All figures courtesy of the author unless otherwise specified - 2. Mechanism of corrosion in an acidic environment - 3. Mechanism of erosion-induced corrosion - 4a. In the wild — erosion-induced corrosion of an epoxy coating on a steel tank - 4b. In the wild — erosion-induced corrosion showing a banding effect of varying dry-film thicknesses of a protective coating - 5a. Domesticated — erosion-induced corrosion in a neutral environment - 5b. Domesticated — erosion-induced corrosion in an acidic environment - 6. Damage-induced corrosion - 7a. Domesticated — damage-induced corrosion in a neutral environment - 7b. Domesticated — damage-induced corrosion in an acidic environment - 8a. In the wild — damage-induced corrosion in a neutral environment - 8b. In the wild — damage-induced corrosion in an acidic environment - 9. Mechanism of corrosion on coated steel from conductive pathways - 10a. An example of domesticated conductive-pathway-induced corrosion - 10b. In the wild — an example of conductive-pathway-induced corrosion - 11. Mechanism of conductive-pathway formation on edges - 12a. Domesticated — corrosion on edges - 12b. In the wild — corrosion on edges - 13. Mechanism of contamination-induced corrosion - 14a. Domesticated — contamination-induced corrosion - 14b. In the wild — contamination-induced corrosionEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6012 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28373
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Code-barres Cote Support Localisation Section Disponibilité 18746 - Périodique Bibliothèque principale Documentaires Disponible Corrosion severity : a function of contaminants, components and coatings / Shiv Charan Prajapati in PAINTINDIA, Vol. LXIV, N° 10 (10/2014)
[article]
Titre : Corrosion severity : a function of contaminants, components and coatings Type de document : texte imprimé Auteurs : Shiv Charan Prajapati, Auteur ; P. K. Kamani, Auteur Année de publication : 2014 Article en page(s) : p. 94-100 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion
Cloquage (défauts)
Corrosion -- Analyse
Humidité
Polluants
Rayures
Revêtements -- Détérioration
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : A corrosion study with respect to contaminants (water soluble salts I ike sulphates, ch lorides and nitrates etc.), design of the components (macro and micro defects developed due to improper design and physico-chemical behaviour of coatings (adhesion, permeation of air and moisture) etc. was done by several scientists and found that these elements prove to be the deciding factors in rate of corrosion. The presence of soluble salts (chloride, sulphate & nitrate) and their effect of the coating-metal interface was studied along with the chemistry of coating, water and oxygen permeabi I ity, coating th ickness and metal surface preparation. The macroscopic defects, caused due to improper design ing, handl ing, etc. also causes corrosion. The surface anomalies have their own rote in deciding the coating life. There are some coating systems which can reduce or postpone corrosion mechanism. Note de contenu : - Effect of contaminants
- Blistering and adhesion
- Organic coatings
- Experimental
- Corrosion scratch test
- Humidity test
- Table 1 : Resins/binders with their composition
- Table 2 : Test results
- Table 3 : Humidity test resutls
- Table 4 : Blistering results
- Table 5 : Under film corrosion
- Table 6 : Water and oxygen permeability of resins
- Table 7 : Occurrence of atmospheric sulfur compounds according to ISO N43E
- Table 8 : Occurence of airborne salinity according to ISO N53E
- Table 9 : Solubility of reaction productEn ligne : https://drive.google.com/file/d/1xjBojSsmtY12Lr9pWqywt92lhQtehKMA/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40370
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Code-barres Cote Support Localisation Section Disponibilité 16695 - Périodique Bibliothèque principale Documentaires Disponible Cracking analysis of HVOF coatings under Vickers indentation / A. P. Buang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 4 (12/2008)
PermalinkDecomposable crosslinking paint / Y. Nakayama in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 887 (12/1998)
PermalinkDeep learning-based automated characterization of crosscut tests for coatings via image segmentation / Gaoyuan Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)
PermalinkDegradation modes of crosslinked coatings exposed to photolytic environment / Tinh Nguyen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 1 (01/2013)
PermalinkDegradation of epoxy coatings exposed to impingement flow / Amin Vedadi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
PermalinkDegradation of zinc-rich epoxy coating in 3.5% NaCl solution and evolution of its EIS parameters / Chao Xing in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)
PermalinkDurabilité des peintures extérieures / Erich V. Schmid / Levallois Perret : Galvano Organo - Librairie des Traitements de surface (1998)
PermalinkEffect of exposure conditions on dirt pickup resistance (DPR) / Michael P. Diebold in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 3 (05-06/2020)
PermalinkEffect of tio2 pigment type on the uv degradation of filled coatings / Deborah L. Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 1 (01/2011)
PermalinkEffects of aging on the thickness of a homogeneous film fabricated using a spin coating process / Do Hyung Han in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)
PermalinkEffects of NCO:OH ratio and HEMA on the physicochemical properties of photocurable poly(ester-urethane)methacrylates / Ganesh S. Bhusari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 3 (05/2015)
PermalinkEnhanced corrosion resistance and weathering resistance of waterborne epoxy coatings with polyetheramine-functionalized graphene oxide / Jing Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 1 (01/2020)
PermalinkEnvironmental and time dependence of moisture transportation in an epoxy coating and its significance for accelerated weathering / Shi Xiaodong in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 4 (07/2010)
PermalinkEvaluating cracking using image analysis / B. Pourdeyhimi in EUROPEAN COATINGS JOURNAL (ECJ), N° 11/95 (11/1995)
PermalinkEvaluating traffic paint degradation using image analysis / B. Pourdeyhimi in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 834 (07/1994)
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