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Polymer weathering / Olivier Haillant in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 195, N° 4492 (09/2005)
[article]
Titre : Polymer weathering Type de document : texte imprimé Auteurs : Olivier Haillant, Auteur Année de publication : 2005 Article en page(s) : p. 38-40 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Essais accélérés (technologie)
Photodétérioration
Revêtements -- Détérioration:Peinture -- DétériorationIndex. décimale : 667.9 Revêtements et enduits Résumé : The author looks at the various approaches taken to put accelerated weathering tests into practice.
Although the weathering of organic materials has long been acknowledges, ti was only in the 50's, with the widespread use of paints and coating in our everyday life, that the detrimental effect of light on organic materials became a serious concern to engineers of the coatings industry. It appeared that two main approaches could be considered to adress the problem : consider weathering as a global process affecting the functional properties of a material or approach weathering as a range of chemical reactions at the molecular level accounting for the loss of the service life properties.Note de contenu : - One field, two approaches
- Chemical photo-aging at the molecular level
- The control of relevance based on chemical analysis
- Towards the prediction of the durabilityPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27623
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Code-barres Cote Support Localisation Section Disponibilité 002408 - Périodique Bibliothèque principale Documentaires Disponible Practical adhesion measurements of protective coatings on bronze by three-point bending test / Maëlenn Aufray in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)
[article]
Titre : Practical adhesion measurements of protective coatings on bronze by three-point bending test Type de document : texte imprimé Auteurs : Maëlenn Aufray, Auteur ; Claudie Josse, Auteur ; Andrea Balbo, Auteur ; Cecilia Monticelli, Auteur ; Erika Svara Fabjan, Auteur ; Luka Skrlep, Auteur ; Tadeja Kosec, Auteur ; Nina Gartner, Auteur ; Carla Martini, Auteur ; Giulia Masi, Auteur ; Cristina Chiavari, Auteur ; Elena Bernardi, Auteur ; Maria Chiara Bignozzi, Auteur ; Luc Robbiola, Auteur ; Marija Babnik, Auteur ; Teja Korsic, Auteur ; Marko Kete, Auteur Année de publication : 2019 Article en page(s) : p. 1465-1477 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Bronze
Essais dynamiques
Evaluation
Flexion trois points
Métaux -- Revêtements protecteurs
Objets d'art -- Conservation et restauration
Patine
Revêtements -- DétériorationIndex. décimale : 667.9 Revêtements et enduits Résumé : When attempting to sufficiently protect outdoor bronze monuments from corrosion, searches for an effective solution are usually based on coating applications which have a high anticorrosive efficiency. In order to correctly assess the level of protection provided by such coatings, adherence (practical adhesion) measurements need to be performed for the proper evaluation of the deterioration of coating systems with aging. Although a coupled study of adherence with aging would be of great interest, very few such studies are available. In this work, a methodological approach is proposed for the evaluation of coatings applied to metallic cultural heritage monuments of, based on the use of a three-point bending test. Adherence characterization of different protective coatings has been performed both on bare and on traditionally black-patinated bronze coupons (Cu–Sn alloy with 5.9 wt% Sn), which were used as basic model substrates. The investigated coatings were Incralac®, silane, sol–gel oxysilane, and a silane-modified polymethacrylate (an adhesion promoter for fluoropolymer). The results of measurements which were obtained before and after accelerated aging in concentrated acid rain made it possible to more easily differentiate between the various adherence levels of different coating systems. Coupled with adherence measurements, the results of systematic optical and SEM observation of the different failure morphologies are also presented. In the case of the coated bare alloy, adhesive failures were mainly observed. The silane (PropS-SH) coating showed the best adherence. In the case of the patinated bronze test specimens, only cohesive failures occurred. Adherence is directly related to the cohesion of the black patina rather than that of the applied coating. It was observed that aging reduces the level of the adherence. Note de contenu : - EXPERIMENTAL : Materials - The aging method - Practical adhesion measurements - Adhesive failure observation and surface characterization
- RESULTS AND DISCUSSION : Coated bare bronze (B) - Coated patinated bronze (P)DOI : 10.1007/s11998-019-00230-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00230-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33025
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Code-barres Cote Support Localisation Section Disponibilité 21154 - Périodique Bibliothèque principale Documentaires Disponible Prediction of paint chalking rates from early exposure data / Michael P. Diebold in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 4 (07/2023)
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Titre : Prediction of paint chalking rates from early exposure data Type de document : texte imprimé Auteurs : Michael P. Diebold, Auteur Année de publication : 2023 Article en page(s) : p. 1179-1191 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de titane
Durée de vie (Ingénierie)
Essais accélérés (technologie)
Farinage (défauts)
Modèles mathématiques
Revêtements -- Défauts:Peinture -- Défauts
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements -- Effets du rayonnement ultraviolet:Peinture -- Effets du rayonnement ultravioletIndex. décimale : 667.9 Revêtements et enduits Résumé : Color fade (chalking) data for roughly 1200 paints made with different grades of TiO2 pigment that were exposed in Florida were compiled and analyzed a number of ways. Chalk/fade (C/F) values were calculated for each sample after 6, 7, 8, 9, 12, 15 and 18 months and compared to their final (21 month) C/F values. There is generally excellent agreement between 6- and 9-month C/F results and final C/F values, and this technique can be used with a high level of confidence to rapidly predict C/F durability values. In some instances, early C/F values are better measures of TiO2 pigment photocatalytic activity than the later C/F values. In addition, we examined the effect of starting month on degradation rate and found that after one year, series started in early summer degraded to a greater extent than those started in late autumn, despite the fact that all samples were exposed to the same nominal amount of ultraviolet light. Finally, location of a panel within each exposure series had a small but statistically significant effect on C/F values. Note de contenu : - Objective and method
- Data collection
- Data analysis
- Mathematical modeling : General - Proof of concept - Sources of error
- Other results of interest
- Effect of position in series on chalking
- Effect of starting month on chalking
- Table 1 : Percent of samples with three or more red reflectance values greater than 100 after a set number of months exposed
- Table 2 : Percent of samples having early C/F values within a given range about the final C/F value
- Table 3 : Average difference (measured in C/F units) between early and final C/F values, as a function of exposure time
- Table 4 : Differences between early and final C/F value, classified according to the number of data points used to calculate X22
- Table 5 : Comparison of actual and calculated times to 220 red reflectance for samples with 9-month errors in excess of + 10 C/F unitsDOI : https://doi.org/10.1007/s11998-023-00727-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00727-6.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39709
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Code-barres Cote Support Localisation Section Disponibilité 24153 - Périodique Bibliothèque principale Documentaires Disponible Principles of accelerated weathering : evaluations of coatings / Mark Nichols in COATINGS TECH, Vol. 17, N° 1 (01/2020)
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Titre : Principles of accelerated weathering : evaluations of coatings Type de document : texte imprimé Auteurs : Mark Nichols, Auteur Année de publication : 2020 Article en page(s) : p. 18-25 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais accélérés (technologie)
Photo-oxydation
Résistance aux conditions climatiques
Revêtements -- Détérioration:Peinture -- DétériorationIndex. décimale : 667.9 Revêtements et enduits Résumé : One of paint’s most important attributes is its ability to maintain performance for an extended period of time in its intended service environment. That environment may be an interior wall in a single family home, the outside of an underground pipeline, or the exterior of a vehicle. The service environment is different in all three cases, but the ability to maintain the paint’s functions—aesthetics, adhesion, corrosion protection, and mechanical performance—is still required.
Objects that predominantly reside outdoors are subjected to one of the most challenging service environments for coatings. Exposure to solar radiation, temperature fluctuations, rain, snow, and environmental fallout (acid rain), challenge the performance of most coatings. Examples of painted objects that are exposed to such environments include automobiles, aircraft, infrastructure (bridges and roads), houses, and buildings. To achieve long-term performance, exterior coatings require resistance to degradation by UV radiation, resistance to hydrolysis, and resistance to erosion by rain and snow.
The durability of a coating is typically assessed by exposing it at selected outdoor locations to quantify the coating’s real-world performance. While natural exposure outdoors is a reliable method of assessment, natural exposure provides little acceleration. A coating that performs acceptably after five years of Florida exposure means that the coating will survive five years of exposure in Florida, but this says nothing about its performance after 5.5 years or 10 years. It does mean that the coating may survive longer than five years in a less harsh environment, but the failure mode may change, as environmental loads can vary dramatically from region to region.1 Thus, it is impractical to develop coatings using natural outdoor exposure as a method to assess their long-term durability, as product development time cycles are not compatible with test methods that take five-plus years to perform.
Coating formulators, therefore, rely heavily on accelerated weathering tests to develop and optimize coating formulations. Accelerated weathering tests attempt to degrade a coating at a faster rate than that which occurs during natural exposure. However, to be reliable and useful, the increased rate of degradation must not sacrifice the accuracy of the results, meaning the correlation between accelerated weathering results and natural weathering results must be quite high. Unreliable results produced quickly are not useful, and can potentially be quite damaging to a company’s reputation and bottom line. The bulk of this article will discuss the science behind paint degradation and the various methods used to assess paint weatherability.Note de contenu : - Paint degradation chemistry
- Coating stabilization
- Natural weathering testing
- Accelerated weathering tests
- Post-exposure testing
- Correlation to outdoor exposure
- Fig. 1 : Reaction schematic for photooxidation in polymers
- Fig. 2 : Painted panels in exposure racks in south Florida. (Upper) automative coatings exposed at 5° south and (lower) architectural coatings exposed at 90° south
- Fig. 3 : QUV accelerated weathering chamber
- Fig. 4 : The spectral power distribution of UV-A and UV-B bulbs used in a QUV accelerated weathering instrument. The spectrum of sunlight is also shown as a reference
- Fig. 5 : Weather-Ometer accelerated weathering instrument
- Fig. 6 : Spectral power distribution of xenon-arc lamps filtered with boro/boro and quartz/boro filter combinations. Sunlight spectrum also shown for reference ; SPD of sunlight, Righlight, and boro/boro filtered light on log scale to demonstrate the fidelity of the match between sunlight and Righlight filter combination
- Fig. 7 : Fresnel-type accelerated outdoor exposure device
- Table 1 : Accelerated weathering test conditionsEn ligne : https://drive.google.com/file/d/1WnhA_OsUarcCoYy3KIMGK5ZYelbOuCni/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33600
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Code-barres Cote Support Localisation Section Disponibilité 21512 - Périodique Bibliothèque principale Documentaires Disponible Protecting offshore platforms in the Gulf of Mexico : shortcuts = potential havoc / Peter Bock in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 7 (07/2016)
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Titre : Protecting offshore platforms in the Gulf of Mexico : shortcuts = potential havoc Type de document : texte imprimé Auteurs : Peter Bock, Auteur Année de publication : 2016 Article en page(s) : p. 18-20 Langues : Américain (ame) Catégories : Analyse des défaillances (fiabilité)
Métaux -- Revêtements protecteurs
Qualité -- Contrôle
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements protecteurs -- Détérioration
Structures offshore -- Entretien et réparations
Structures offshore -- Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : Maintenance painting on offshore oil production structures in the Gulf of Mexico presents extremely severe environmental challenges, both for the contractor’s surface preparation and coating application, and for the service life of the applied coating system. Very high costs, limited space, poor working conditions and the constant threat of delays from bad weather all conspire against getting a project done exactly according to specification, SSPC-PA 2 and best painting practice. But because of the severity of the environment, minor shortcuts that might not even be noticed long-term in an onshore mild environment project can wreak havoc on an offshore structure. Note de contenu : - Fig. 1. Bare, rusty steel in failed areas showed different levels of inorganic zinc residue
- Fig. 2. This nonferrous machinery cover showed the same type of coating failure due to poor surface preparation and excessive coating system thickness
- Fig. 3. Many areas had lost the coating system to bare steel; in others, the coating was still in place but disbonded, with rust beneathEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=5875 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28416
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Code-barres Cote Support Localisation Section Disponibilité 18240 - Périodique Bibliothèque principale Documentaires Disponible Putting alkyds in the shade / Andrew Trapani in EUROPEAN COATINGS JOURNAL (ECJ), N° 04/2010 (04/2010)
PermalinkA quantitative study of nanoparticle release from nanocoatings exposed to UV radiation / Lipiin Sung in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 1 (01/2015)
PermalinkPermalinkA review of high-quality epoxy resins for corrosion-resistant applications / Shams Anwar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 21, N° 2 (03/2024)
PermalinkSaponification : from paint to the grave / E. Bud Senkowski in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 31, N° 5 (05/2014)
PermalinkScientific coating inspection / J. Sonke in PROTECTIVE COATINGS EUROPE (PCE), Vol. 4, N° 2 (04-05-06/2012)
PermalinkSilyl-containing polyurethanes that selectively disassemble with fluoride salts / Erick B. Iezzi in COATINGS TECH, Vol. 17, N° 1 (01/2020)
PermalinkSimulations of nanoscale and macroscopic property changes on coatings with weathering / Brian R. Hinderliter in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 3 (07/2006)
PermalinkSimultaneous acid exposure and erosive particle wear of thermoset coatings / Victor Buhl Møller in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 3 (05/2018)
PermalinkStatistical modeling of coating lifetimes in disparate environments / Mark E. Nichols in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 1 (01/2015)
PermalinkA study of the effect of acid rain on alkyd, polyester, and silicone-modified high-solids coatings in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 67, N° 850 (11/1995)
PermalinkA study of water at the organic coating/substrate interface / Tinh Nguyen in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 834 (07/1994)
PermalinkStudy on photostabilization in situ of reactive hindered amine light stabilizers applied to UV-curable coatings / Yongtao Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 4 (07/2012)
PermalinkPermalinkSurface characterization of some porous natural stones modified with a waterborne fluorinated polysiloxane agent under physical weathering conditions / Ibrahim Ugur in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 4 (07/2014)
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