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Auteur Muhammad Ahsan Bashir |
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Detection of different chemical binders in coatings using hyperspectral imaging / Bahman Raeissi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 2 (03/2022)
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Titre : Detection of different chemical binders in coatings using hyperspectral imaging Type de document : texte imprimé Auteurs : Bahman Raeissi, Auteur ; Muhammad Ahsan Bashir, Auteur ; Joseph L. Garrett, Auteur ; Milica Orlandic, Auteur ; Tor Arne Johansen, Auteur ; Torbjorn Skramstad, Auteur Année de publication : 2022 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Diluants
Données massives
Epoxy amine
Epoxy novolac
Imagerie (technique)
Liants
Métaux -- Revêtements protecteurs
Ondes décamétriques
Organosilanes
Polyuréthanes
Produits chimiques -- Détection
Rayonnement infrarougeIndex. décimale : 667.9 Revêtements et enduits Résumé : Organic coatings protect metallic structures of significant commercial value. Regular inspections of coatings are required to ensure their integrity and, therefore, to verify their stated performance. However, for metallic structures located in harsh places, coating inspection can pose significant safety and logistical challenges. Near-infrared (NIR) spectroscopy is a rapid, nondestructive and relatively inexpensive analytical technique. It is currently employed to analyze different chemicals in fields like agriculture, food, and pharmaceuticals. Similarly, hyperspectral imaging (HSI) creates a spatial map of spectral information by measuring light reflected from a material. In this work, hyperspectral imaging in the NIR portion of the electromagnetic spectrum (NIR-HSI) is used to accurately distinguish between the chemically different binders employed in commercial organic coatings. In addition, k-means clustering is explored as a tool to provide diagnostic information about the spatial inhomogeneities in the chemical structure of an applied coating, which, if undetected, can lead to coating defects during service life. The results of this work suggest that the NIR-HSI could be used for remote inspections of organic coatings. Note de contenu : - EXPERIMENTAL WORK : Chemicals and panels preparation - Hyperspectral imaging system and data acquisition - Methods
- RESULTS AND DISCUSSIONS : Epoxy-amine systems - Epoxy novolac cured with amine curing agent - Silicone resin with organosilane - Polyurethane - Different extenders used in model epoxy-amine systems - Distinguishing between bindersDOI : https://doi.org/10.1007/s11998-021-00544-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00544-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37287
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 2 (03/2022)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23408 - Périodique Bibliothèque principale Documentaires Disponible The effect of glass transition temperature of commercial epoxy-amine coatings on their performance in marine environment / Muhammad Ahsan Bashir ; Heng Li ; Vivian B. Farstad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 3 (05/2023)
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Titre : The effect of glass transition temperature of commercial epoxy-amine coatings on their performance in marine environment Type de document : texte imprimé Auteurs : Muhammad Ahsan Bashir, Auteur ; Heng Li, Auteur ; Vivian B. Farstad, Auteur Année de publication : 2023 Article en page(s) : p. 919-933 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique
Calorimétrie
Epoxy amine
Milieu marin
Revêtements organiques
Test d'immersionIndex. décimale : 667.9 Revêtements et enduits Résumé : Glass transition temperature (Tg) of the commercial epoxy–amine marine coatings is among the most important thermo-mechanical properties which determine the performance of the individual coat and the whole coating system. Ingress of (sea) water and temperature are known to have an influence on the Tg of model epoxy–amine coatings. This work shows the use of thermal analysis techniques like temperature-modulated differential scanning calorimetry (MDSC) and dynamic mechanical analysis (DMA) to study the effect of water immersion and immersion temperature on the Tg of four different commercial epoxy–amine coatings. In addition, Fourier transform infrared (FTIR) spectroscopy was used to study the chemical changes that occurred in the epoxy–amine network upon immersion in water at 40 and 60°C. The results obtained clearly show that the Tg is significantly influenced by water and water immersion temperature if the Tg (or the Tg region) of the epoxy–amine coating is lower than the immersion temperature. FTIR results showed that chemical changes can happen in the epoxy–amine network upon water immersion. Practical example of the effect of Tg of coatings on their protective performance has been demonstrated by using the NACE TM-0174 standard’s equipment which showed that the low Tg epoxy–amine coatings will lose their protective properties earlier than the high Tg coatings when exposed to similar test conditions. Note de contenu : - Table 1 : Tg and mixing ratio of the different commercial products used in this work
- Table 2 : Comparison of Tgs of four products measured by using reversing heat flow (rev HF), total heat flow (total HF) in MDSC with the Tg estimated from peak of loss modulus (E″) and peak of tan δ
- Table 3 : Comparison of Tg of reference sample and the samples taken from different places on NACE cell panels exposed to 65°C for 15 daysDOI : https://doi.org/10.1007/s11998-022-00712-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00712-z.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39437
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 3 (05/2023) . - p. 919-933[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24069 - Périodique Bibliothèque principale Documentaires Disponible