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JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH . Vol. 13, N° 3Mention de date : 05/2016Paru le : 14/06/2016 |
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Ajouter le résultat dans votre panierDurability enhancement of icephobic fluoropolymer film / R. Jafari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
[article]
Titre : Durability enhancement of icephobic fluoropolymer film Type de document : texte imprimé Auteurs : R. Jafari, Auteur ; Gelareh Momen, Auteur ; M. Farzanch, Auteur Année de publication : 2016 Article en page(s) : p. 405-412 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
AluminiumL'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite.
L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement.
L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium.
Angle de contact
Durée de vie (Ingénierie)
Glaciophobie
Hydrophobie
Métaux -- Revêtements protecteurs
Polytétrafluoréthylène
Pulvérisation cathodique
Technique des plasmas
Traîtements de surfaceIndex. décimale : 667.9 Revêtements et enduits Résumé : An icephobic and superhydrophobic surface was made by the sputtering of fluoropolymer material (PTFE or Teflon®) on anodized aluminum alloys. The study of this superhydrophobic coating under atmospheric icing conditions showed a 3.5 times reduction of its ice adhesion strength. To evaluate the longevity of such coated surfaces and to assess their potential outdoor applications, their durability was studied after several icing/de-icing cycles. However, these coatings showed weak stability after several icing/de-icing cycles. Plasma argon pretreatment of the anodized aluminum surface was used before sputtering to increase adhesion strength between the anodized aluminum surface and Teflon-like coating. Ice adhesion and contact angle measurements of the pretreated Teflon-like coating indicated clearly that the instability was associated with the low cohesion strength of the Teflon-like film. In order to improve the cohesive strength of the coating, the input power of the discharge was increased during the sputtering process. XPS, SEM, and contact angle analyses showed that an increase in input power renders the Teflon-like coating more stable. The results of ice adhesion measurement showed low variation in ice adhesion strength on such surfaces after 15 icing/de-icing cycles. This coating also showed an excellent stability under UV irradiation and condensation. DOI : 10.1007/s11998-015-9759-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9759-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26282
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Code-barres Cote Support Localisation Section Disponibilité 18071 - Périodique Bibliothèque principale Documentaires Disponible Orange peel formation due to surface tension-driven flows within drying paint films / N. Saranjam in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
[article]
Titre : Orange peel formation due to surface tension-driven flows within drying paint films Type de document : texte imprimé Auteurs : N. Saranjam, Auteur ; S. Chandra, Auteur ; Javad Mostaghimi, Auteur ; H. Fan, Auteur ; J. Simmer, Auteur Année de publication : 2016 Article en page(s) : p. 413-426 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable
Métaux -- Revêtements:Métaux -- Peinture
Revêtement en phase solvant:Peinture en phase solvant
Revêtements -- Défauts:Peinture -- Défauts
Tension superficielle
Transfert de masseIndex. décimale : 667.9 Revêtements et enduits Résumé : Paint films with uniform thicknesses ranging from 150 to 820 μm were applied on stainless steel substrates using a model paint consisting of a resin dissolved in butanol and the test samples were cured in a natural convection oven at a temperature of 140°C. Photographs of the paint surface were taken during drying, and the weight loss was measured. Cellular structures appeared on the paint surface, induced by surface tension-driven flows due to solvent concentration variations. For thin films (<500 µm), the patterns disappeared in a few minutes and the dried paint surface was smooth, while for thicker paint films, wave-like structures remained on the hardened paint layer, creating an uneven surface. An analytical solution of the mass-diffusion equation was used to model solvent evaporation from the paint film and to calculate the concentration gradient and surface tension variations in the paint films. In thin films, all the solvent was depleted, and surface tension gradients disappeared before curing was complete, allowing the surface to become smooth. In thicker films, concentration gradients that drove cellular flows persisted until the paint dried, leaving orange peel on the surface. DOI : 10.1007/s11998-015-9752-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9752-6.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26283
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Code-barres Cote Support Localisation Section Disponibilité 18071 - Périodique Bibliothèque principale Documentaires Disponible Accelerated weathering and chemical resistance of polyurethane powder coatings / S. Rossi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
[article]
Titre : Accelerated weathering and chemical resistance of polyurethane powder coatings Type de document : texte imprimé Auteurs : S. Rossi, Auteur ; Michele Fedel, Auteur ; S. Petrolli, Auteur ; Flavio Deflorian, Auteur Année de publication : 2016 Article en page(s) : p. 427-437 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Essais accélérés (technologie)
Polyuréthanes
Résistance chimique
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements poudre:Peinture poudre
solvants
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : A study of the weathering mechanism of innovative polyurethane powder coatings has been performed. UV-B irradiation and condensation cycle accelerated tests were carried out on two different polyurethane powder coating formulations for outdoor applications. Using Fourier transform infrared spectroscopy and microscope observation, it was possible to analyze the photochemical and morphological modifications. In addition, the color and gloss changes were measured. Organic coatings are often in contact with solvents in particular during cleaning actions. The chemical resistance was then studied considering the evolution of the corrosion barrier property of the coating as a function of the solvent contact time. Electrochemical impedance spectroscopy measurements were carried out. Methylethylketone (polar) and xylene (apolar) were considered as representative solvents. Due to the strong polarity, the first solvent showed a strong interaction with the hydrogen bonds between the polyurethane chains causing the solvent uptake. The amount of solvent uptake depends on the coating chains rigidity caused by the different polyester resin monomers. The apolar xylene presented no significant interaction with the coatings. Note de contenu : - Sample characterization
- UV-B-condensation aging
- Solvent resistanceDOI : 10.1007/s11998-015-9764-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9764-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26284
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Code-barres Cote Support Localisation Section Disponibilité 18071 - Périodique Bibliothèque principale Documentaires Disponible Anticorrosive epoxy/clay nanocomposite coatings : rheological and protective properties / Milos D. Tomic in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
[article]
Titre : Anticorrosive epoxy/clay nanocomposite coatings : rheological and protective properties Type de document : texte imprimé Auteurs : Milos D. Tomic, Auteur ; Branko Dunjic, Auteur ; Jelena B. Bajat, Auteur ; Violeta Likic, Auteur ; Jelena Rogan, Auteur ; Jasna Djonlagic, Auteur Année de publication : 2016 Article en page(s) : p. 439-456 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Argile
Cloisite
Dispersions et suspensions
Epoxydes
Nanoparticules
RhéologieIndex. décimale : 667.9 Revêtements et enduits Résumé : The preparation of epoxy/clay nanocomposites (NCs) and their insertion into coatings are of great importance since the NCs could enhance the protective performances. In this study, epoxy NCs with 1–10 wt% of nanoclay Cloisite 30B (C30B) were prepared by the sonication-assisted solution method. The rheological measurements of epoxy/C30B suspensions revealed non-Newtonian, shear-thinning behavior of the uncured NCs, with an increase in the viscosity, yield stress, and shear modules with increasing organoclay content, while the dispersion effectiveness of C30B decreased. A significant enhancement of the rheological parameters was observed at the second percolation threshold (4.1 vol%) due to the formation of a continuous network of 45-layer-thick tactoids. Although NCs with 1–3 wt% C30B exhibited slightly reduced mechanical and adhesion properties compared with the cured reference epoxy resin, the epoxy primer and topcoat based on NC with 1 wt% C30B generally displayed improved impact resistance and maintained flexibility, pendulum hardness, and good adhesion properties. Two-layer coating systems, i.e., NC-based primers and topcoats, had higher corrosion stability in a salt spray chamber compared to the unmodified system. Note de contenu : - EXPERIMENTAL : Materials - Epoxy NCs preparation - Application of epoxy Ncs on steel substrates - Epoxy coatings preparation - Application of epoxy coatings on steel substrates - Sample characterization
- RESULTS AND DISCUSSION : Free swelling and rheological properties of the C30B/thinner dispersion - Rheological properties of the uncured epoxy Ncs - Structural characterization of cured epoxy Ncs - Adhesive and mechanical properties of epoxy NCs - Adhesive and mechanical properties of NC-based primer and topcoat - Anticorrosive properties of epoxy coatingsDOI : 10.1007/s11998-015-9762-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9762-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26285
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Code-barres Cote Support Localisation Section Disponibilité 18071 - Périodique Bibliothèque principale Documentaires Disponible Influence of PEPA-containing polyether structure on fire protection of transparent fire-resistant coatings / Yanchao Shi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
[article]
Titre : Influence of PEPA-containing polyether structure on fire protection of transparent fire-resistant coatings Type de document : texte imprimé Auteurs : Yanchao Shi, Auteur ; Guojian Wang, Auteur Année de publication : 2016 Article en page(s) : p. 457-468 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages polymères
Copolymère mélamine-formaldéhyde
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
PolyamidesUn polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine.
Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères.
Polyéthers
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
Transparence (optique)Index. décimale : 667.9 Revêtements et enduits Résumé : Three kinds of novel PEPA-containing polyether flame retardants were synthesized by 1-oxo-4-hydroxymethyl-2,6,7-trioxa-l-phosphabicyclo [2.2.2] octane (PEPA), phosphorus oxychloride (POCl3), and polyether with different structures (PEG, PPG, and PTMG). Their structures were confirmed by 1H nuclear magnetic resonance (1H NMR) and Fourier transform infrared spectroscopy (FTIR). The solubility test showed that PEPA modified by polyethylene glycol (PEG) and polypropylene glycol (PPG) had better water solubility than that modified by poly(tetrahydrofuran) (PTMG). The decomposition process of PEPA-containing polyether flame retardants (PCPE) was studied by thermogravimetric analysis (TG) and derivative thermogravimetry. A possible mechanism was proposed to analyze the influence of polyether structure on the thermal degradation process of PCPEs. Afterward, the PEPA-containing polyether flame retardants were mixed with melamine formaldehyde resin to prepare the transparent fire-resistant coatings. The influences of polyether structure on the properties of the coatings were investigated in detail by fire protection test, TG, FTIR, X-ray photoelectron spectroscopy (XPS), and scanning electron microscope. It was found that the fire protection of the coating and foam structure of char layer were significantly improved when the number of carbon atoms in a unit of polyether chain was less. TG results showed that the chain unit of polyether with less carbon atom number could increase the residue weights of the coatings. FTIR and XPS result illustrated that the char layers were mainly composed of aromatic rings and phosphorus oxide, and the antioxidation and char-forming ability of coatings were enhanced effectively with the decrease in the number of carbon atoms in a unit of polyether chain. Note de contenu : - EXPERIMENTAL : Materials - Synthesis - Preparation of transparent fire-resistant coatings - Fire protection test - Measurements and characterization
- RESULTS AND DISCUSSION : Characterization of PEPA-containing polyether flame retardants - Solubility of PEPA-containing polyether flame retardants - Thermal analysis of PEPA-containing polyether flame retardants - Thermal analysis of fire-resistant coatings - Fire protection performance and intumescent - Elemental analysis of intumescent char layers - Morphology of char layersDOI : 10.1007/s11998-015-9763-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9763-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26286
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Code-barres Cote Support Localisation Section Disponibilité 18071 - Périodique Bibliothèque principale Documentaires Disponible Towards a practical metric of surface gloss for metallic coatings from automotive industry / Mengting Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
[article]
Titre : Towards a practical metric of surface gloss for metallic coatings from automotive industry Type de document : texte imprimé Auteurs : Mengting Wu, Auteur ; Haisong Xu, Auteur ; Zhehong Wang, Auteur ; Haifeng Li, Auteur Année de publication : 2016 Article en page(s) : p. 469-477 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Carrosseries
Brillance (optique)
Evaluation visuelle
Mesure
Revêtement métalliqueIndex. décimale : 667.9 Revêtements et enduits Résumé : The specular gloss of metallic coatings from the automotive industry can be well measured by current glossmeters when the geometry is appropriately chosen from 20°, 60°, and 85° based on the gloss levels observed. However, the measurements are discontinuous and even nonmonotonic at the breakpoints dividing samples into different gloss levels in the whole range, which causes confusion and inconvenience for industry applications. In this study, attempts were made to link the measurements at the three geometries to be continuous monotonically and in the meanwhile to improve the accuracy of estimating visual gloss. A psychophysical experiment based on a magnitude method was carried out to assess the gloss of metallic coatings with different colors and textures. The visually scaled gloss data were compared with spectrophotometric measurements and instrumental specular gloss values under different geometries. With different weighing coefficients for measurements at individual geometries depending on the gloss levels, a model was proposed to describe the visual surface gloss of metallic coatings comprehensively via a practical metric based on the geometry-dependent measurements. In this way, each sample would have a unique overall gloss value highly correlated with its perceptual evaluation over the entire gloss range. Note de contenu : - EXPERIMENTS : Samples - Gloss measurements - Visual assessments
- RESULTS AND DISCUSSION : Observer variability - Correlation between visual assessments and instrumental measurements
- A MODEL OF VISUAL GLOSSDOI : 10.1007/s11998-015-9771-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9771-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26287
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Code-barres Cote Support Localisation Section Disponibilité 18071 - Périodique Bibliothèque principale Documentaires Disponible Drying activity of oxovanadium(IV) 2-ethylhexanoate in solventborne alkyd paints / Ondrej Preininger in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
[article]
Titre : Drying activity of oxovanadium(IV) 2-ethylhexanoate in solventborne alkyd paints Type de document : texte imprimé Auteurs : Ondrej Preininger, Auteur ; Jan HonzÃcek, Auteur ; Petr Kalenda, Auteur ; Jaromir Vinklà rek, Auteur Année de publication : 2016 Article en page(s) : p. 479-487 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fourier, Spectroscopie infrarouge à transformée de
Oxydes de vanadium
Polyalkydes
Revêtement en phase solvant:Peinture en phase solvant
SiccatifsUn siccatif est une substance qui joue un rôle de catalyseur en accélérant le séchage ou durcissement (polymérisation) d'un matériau tel une huile ou une peinture à base d'huile (pour le bâtiment ou les artistes).Index. décimale : 667.9 Revêtements et enduits Résumé : Oxovanadium(IV) 2-ethylhexanoate was established as a new primary drier for alkyd-based paints. A series of experiments has demonstrated an excellent drying activity toward solvent-borne alkyd resins of different oil length at considerably lower metal concentration than optimal for commercial cobalt(II) 2-ethylhexanoate. The behavior in real paint was simulated on formulations bearing inhibitor of autooxidation. The detailed studies of the drying process have shown that the relatively slow initial step of autooxidation reaction, when compared with cobalt compounds, is compensated for by the absence of the induction times. Furthermore, the active oxovanadium(IV) species are not consumed during the drying processes as evidenced by EPR spectroscopic measurements. Note de contenu : - EXPERIMENTAL : Materials and chemicals - Synthesis of oxovanadium(IV) 2-ethylhexanoate (VO-octoate) - Film preparation - Film drying time - Determination of film hardness - Measurements of coloration - Time-resolved FTIR experiments - EPR spectroscopy
- RESULTS AND DISCUSSION : Synthesis and characterization of VO-octoate - Drying performance of VO-octoate - Coloration of the alkyd coating dried by VO-octoate - Kinetic experiments - EPR spectroscopic measurementsDOI : 10.1007/s11998-015-9779-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9779-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26288
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Code-barres Cote Support Localisation Section Disponibilité 18071 - Périodique Bibliothèque principale Documentaires Disponible Improvement of adherence and anticorrosion properties of an epoxy-polyamide coating on steel by incorporation of an indole-3 butyric acid-modified nanomagnetite / Anh Truc Trinh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
[article]
Titre : Improvement of adherence and anticorrosion properties of an epoxy-polyamide coating on steel by incorporation of an indole-3 butyric acid-modified nanomagnetite Type de document : texte imprimé Auteurs : Anh Truc Trinh, Auteur ; Thu Trang Nguyen, Auteur ; Thu Thuy Thai, Auteur ; Thi Xuan Hang To, Auteur ; Xuan Hoan Nguyen, Auteur ; Anh Son Nguyen, Auteur ; Maëlenn Aufray, Auteur ; Nadine Pébère, Auteur Année de publication : 2016 Article en page(s) : p. 489-499 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
Essais d'adhésion
Essais de brouillard salin
Métaux -- Revêtements protecteurs
Nanoparticules
Oxyde de fer
PolyamidesUn polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine.
Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères.Index. décimale : 667.9 Revêtements et enduits Résumé : In this study, synthesized magnetite (Fe3O4) nanoparticles were treated with a corrosion inhibitor, indole-3 butyric acid (IBA) and incorporated in an epoxy-polyamide coating. The coating was applied on a carbon steel substrate. For comparison, coatings without particles or with nontreated Fe3O4 particles were also prepared. The IBA-modified nanomagnetite (IBA–Fe3O4) was characterized by infrared spectroscopy and Zeta potential measurements. The inhibitive action of IBA was shown by electrochemical measurements (polarization curves) performed for a bare carbon steel in 0.1 M NaCl solution containing Fe3O4 or IBA–Fe3O4 nanoparticles. Adherence and anticorrosion properties of the epoxy-based coatings containing Fe3O4 or IBA–Fe3O4 were compared to those of the pure epoxy-polyamide resin by dry and wet adherence measurements and by salt spray test. The results showed significant improvement of the film adherence and higher corrosion protection of the carbon steel in the presence of IBA–Fe3O4. It was concluded that the IBA effect was restricted to the metal/coating interface. Note de contenu : - EXPERIMENTAL : Materials - Synthesis and surface modification of the Fe3O4 nanoparticles - Analytical characterizations - Electrochemical measurements - Differential scanning calorimetry (DSC) - Salt spray test - Adherence tests
- RESULTS AND DISCUSSION : Characterization of the IBA-Fe3O4 nanoparticles - Characterization of the epoxy-polyamide coatings - Corrosion protection performance - Adherence measurementsDOI : 10.1007/s11998-015-9768-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9768-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26289
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Code-barres Cote Support Localisation Section Disponibilité 18071 - Périodique Bibliothèque principale Documentaires Disponible Study of impedance model and water transport behavior of modified solvent-free epoxy anticorrosion coating by EIS / Rui Ding in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
[article]
Titre : Study of impedance model and water transport behavior of modified solvent-free epoxy anticorrosion coating by EIS Type de document : texte imprimé Auteurs : Rui Ding, Auteur ; Jianming Jiang, Auteur ; Taijiang Gui, Auteur Année de publication : 2016 Article en page(s) : p. 501-515 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.
Epoxydes
Equation cinétique
Humidité -- Absorption:Eau -- Absorption
Métaux -- Revêtements protecteurs
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : This paper studies the evolution of impedance model of 30 μm solvent-free epoxy coating on Q235 steel surface in 3.5% NaCl solution using electrochemical impedance spectroscopy. The electrochemical process of the system was divided into five stages. Water absorption occurred at the coating mainly during the early stage of immersion. In the meantime, coating resistance became smaller and coating impedance deviated from purely capacitive characteristics. After water permeated into the metal/coating interface, corrosion reaction began. During the middle stage of immersion, due to the barrier effect of the coating, the electrochemical reaction at the coating/metal interface was controlled by diffusion of corrosion products. Since the coating prepared was relatively thin, transport distance was short for water, which could easily reach the coating/metal interface. During the middle-late stage of immersion, coating peeled off from the metal surface, diffusion of water molecules gradually turned to a macroscopic infiltration process, and the coating lost its protective effect. A logarithm of coating capacitance and the square root of time showed a linear relationship in the early immersion stage, which was a typical characteristic of Fick’s diffusion. Water diffusion coefficient in the coating was calculated to be 8.23 × 10−11 cm2/s, while volume fraction and total water absorption at saturation of coating were 3.5% and 105 μg/cm2, respectively, indicating good water resistance and protective properties of the coating. By solving the Fick’s diffusion equation, the kinetic equation which described the diffusion of water in the coating and included time and location variables were obtained. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Experimental materials and preparation of specimens - EIS measurement
- RESULTS AND DISCUSSION : Evolution of impedance and equivalent circuit model - Water transport behavior in coatingDOI : 10.1007/s11998-015-9769-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9769-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26290
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 3 (05/2016) . - p. 501-515[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18071 - Périodique Bibliothèque principale Documentaires Disponible Microwave synthesis and spectroscopic studies of some complex compounds as pigments and their applications in paints / Ali M. Hassan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
[article]
Titre : Microwave synthesis and spectroscopic studies of some complex compounds as pigments and their applications in paints Type de document : texte imprimé Auteurs : Ali M. Hassan, Auteur ; Osama A. G. Wahba, Auteur ; A. M. Naser, Auteur ; A. Mohy Eldin, Auteur Année de publication : 2016 Article en page(s) : p. 517-525 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Metal complex pigments have been widely used for various applications such as pigments in coatings. This work presents the use of microwave technique (Green chemistry) for the synthesis of new copper(II), nickel(II), iron(III), and chromium(III) Schiff base complexes derived from metal salts and Schiff base ligand. Also, the microwave technique was used in the synthesis of Schiff base ligand which is derived from selected amine, namely methoxy-tolidine, and selected aldehyde, namely 2-hydroxynaphthaldehyde. The prepared ligand and metal complex pigments were characterized by elemental analysis, NMR, spectral UV–Vis, infrared, and thermal gravimetric analysis. The physical and mechanical properties and corrosion resistance of dry paint films were also examined. The obtained results revealed that the prepared metal complex pigments showed excellent mechanical and corrosion resistance. Note de contenu : - EXPERIMENTAL : Preparation of ligand (BHNMT) - Preparation of solid complexes and their evaluation as pigments - Paint preparation, evaluation, and application
- RESULTS AND DISCUSSION : Infrared spectra
- H-NMR SPECTRA : UV reflectance - Evaluation of the prepared complexes as pigments in paintsDOI : 10.1007/s11998-015-9770-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9770-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26291
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Code-barres Cote Support Localisation Section Disponibilité 18071 - Périodique Bibliothèque principale Documentaires Disponible Effect of electrostatic assist and gravure process parameters on voids and dot skips reduction in shrink PVC film / Akshay V. Joshi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
[article]
Titre : Effect of electrostatic assist and gravure process parameters on voids and dot skips reduction in shrink PVC film Type de document : texte imprimé Auteurs : Akshay V. Joshi, Auteur Année de publication : 2016 Article en page(s) : p. 527-534 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chlorure de polyvinyle
HéliogravureTags : 'Shrink PVC film' Heliogravure ESA 'Void area' 'Dot skips' Index. décimale : 667.9 Revêtements et enduits Résumé : Gravure is the most popular process used to print on shrink films for larger volume runs and high-quality reproduction. Polyvinyl chloride (PVC) holds the major share in shrink application. However, print defects such as voids and dot skips are the major concern while printing on shrink PVC film. The presence of these defects degrades the print quality and causes print rejections. The electrostatic assist (ESA) in gravure is designed to eliminate dot skips; however, the effect of ESA parameters such as air gap and voltage on print defects needs to be explored in depth. Thus, this study aims to minimize print defects by optimization of gravure process parameters. The study investigates the effect of process parameters such as line screen, air gap (distance between charge bar and impression roller), viscosity, voltage and speed on voids and dot skips. A general full factorial was designed and statistical model was developed to determine the influence of each process parameter on defect minimization. The results showed the significance of all the process parameters in reduction of dot skips and void area. The improved ink transfer with ESA resulted in elimination of dot skips and minimization of void area by 96%. Note de contenu : - EXPERIMENTAL : Substrate and ink - Gravure cylinder - Experimental process - Experimental design - Methods of data gathering
- RESULTS AND DISCUSSION : Baseline foir voids and dot skips - Hypothesis statement - Statistical analysis for void area/sheet - Regression equation - Dot skipsDOI : 10.1007/s11998-015-9774-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9774-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26292
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Code-barres Cote Support Localisation Section Disponibilité 18071 - Périodique Bibliothèque principale Documentaires Disponible Enhanced flame retardancy of latex coating doped with clay nanotubes / Anupam R. Joshi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
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Titre : Enhanced flame retardancy of latex coating doped with clay nanotubes Type de document : texte imprimé Auteurs : Anupam R. Joshi, Auteur ; Randall Null, Auteur ; Scott Graham, Auteur ; Elshad Abdullayev, Auteur ; Vladimir Mazurenko, Auteur ; Yuri Lvov, Auteur Année de publication : 2016 Article en page(s) : p. 535-541 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argile
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Latex
Nanotubes
Revêtements -- Additifs:Peinture -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : Halloysite clay nanotubes of 0.5–1 μm length and 0.05 μm diameter are cheap and abundantly available natural materials which may be used as an additive for paint formulations. Its admixing at 5 wt% enhances latex paint flame-retardancy and did not change paint color, surface roughness and adhesion to the substrate. Tested according to the ASTM E84 standard, 5 wt% halloysite doping was the best formulation evaluated on the flame spread and smoke developed. Halloysite decomposition resulting in degradation and release of water molecule is believed to be a reason for the decreasing rate of combustion. Note de contenu : - MATERIALS AND METHODS : Materials - Instrumentation - Loading of triphenyl phosphate (TPP) and FR-1 additives - Samples for flame-retardant testing on wooden board and on metal
- RESULTS AND DISCUSSION : Halloysite nanotube characterization - Triphenyl phosphate loading efficiency - Halloysite admixed latex paint samples before the flame test - Halloysite admixed latex paint samples after the flame test on wooden board - Flame test with metal substrate - Mechanisms of halloysite flame retardancyDOI : 10.1007/s11998-015-9775-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9775-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26293
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Code-barres Cote Support Localisation Section Disponibilité 18071 - Périodique Bibliothèque principale Documentaires Disponible Ethanol extract of propolis as a protective coating for mild steel in chloride media / L. M. P. Dolabella in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
[article]
Titre : Ethanol extract of propolis as a protective coating for mild steel in chloride media Type de document : texte imprimé Auteurs : L. M. P. Dolabella, Auteur ; J. G. Oliveira, Auteur ; V. Lins, Auteur ; T. Matencio, Auteur ; W. L. Vasconcelos, Auteur Année de publication : 2016 Article en page(s) : p. 543-555 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
Electrochimie
Métaux -- Revêtements protecteurs
Propolis
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : The anticorrosion performance of commercial extract of ethanolic propolis (EP)-coated mild steel samples immersed in a 3.5% w/v NaCl in neutral and near neutral media was evaluated by classical electrochemical and electrochemical probe beam deflection techniques. The functional groups and major components of the extract were identified by Fourier transform infrared spectroscopy and high-performance liquid chromatography, respectively. The extract and the major constituent identified in the extract, 3,5-diprenyl-4-hydroxycinnamic acid (DHCA), are poorly hydro-soluble in a neutral medium. The bare and coated carbon steel surfaces were characterized by scanning electron microscopy and atomic force microscopy before and after a saline immersion. The electrochemical response of the coated electrodes was compared with bare mild steel electrodes and all qualitative and quantitative data obtained supported the hypothesis that EP is a potential mild steel corrosion inhibitor. Although several flavonoids are known to have remarkable antioxidant properties and be effective metal corrosion inhibitors, this work is pioneering in its evaluation of the inhibitory capacity of a natural product whose main constituent is DHCA. Note de contenu : - PROPOLIS
- THEORY OF ELECTROCHEMICAL AND OPTICAL EXPERIMENTS (EPBD)
- METHODOLOGY : Propolis source - Electrolyte medium : composition and pH - Electrodes - Electrochemical experiments - Coupled electrochemical and optical experiments (EPBD) - Electrode surface characterization by atomic force microscopy (AFM) - Electrode surface characterization by scanning electron microscopy (SEM)
- RESULTS AND DISCUSSION : Carbon steel and extract characterizations - Electrochemical experiments : open circuit potential (OCP), polarization resistance (PR), potentiodynamic linear polarization (LV), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) - Coupled electrochemical and optical experiments (EPBD - Electrode surface characterization by atomic force microscopy (AFM) - Electrode surface characterization by scanning electron microscopyDOI : 10.1007/s11998-015-9765-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9765-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26294
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