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A Monte Carlo determination of the effectiveness of nanoparticles as spacers for optimizing [TiO.sub.2] opacity / Michael P. Diebold in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 541-552 Titre : A Monte Carlo determination of the effectiveness of nanoparticles as spacers for optimizing [TiO.sub.2] opacity Type de document : texte imprimé Auteurs : Michael P. Diebold, Auteur Année de publication : 2011 Article en page(s) : p. 541-552 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Dioxyde de titane Nanoparticules Opacifiants Index. décimale : 667.9 Revêtements et enduits Résumé : Optimal [TiO.sub.2] opacity is achieved when the [TiO.sub.2] particles are well spaced. Nanoparticle extenders are claimed to improve [TiO.sub.2] spacing by positioning themselves between the larger [TiO.sub.2] particles (0.25 [micro]m) and preventing the [TiO.sub.2] particles from approaching or touching one another. Claims have been made that this can as much as double the light-scattering efficiency of [TiO.sub.2]. This concept was tested by a combination of Monte Carlo simulations and image analysis techniques to determine computationally how the effectiveness of this approach is affected by [TiO.sub.2] concentration, nanoparticle concentration, and nanoparticle size. Surprisingly, the results showed that nanoparticles did not, in fact, improve the spacing of [TiO.sub.2] particles under any of the conditions examined (specifically, in the absence of any inter-particle interactions). Instead, [TiO.sub.2] distributions and spacings were completely indifferent to the presence of smaller particles (however, large extender particles were found to cause [TiO.sub.2] crowding, consistent with expectations and experiments). Explanation and implications of these findings are discussed. Note de contenu : - Randomization of particle positions - Quantification of TiO2 dispersion - Computational protocol DOI : 10.1007/s11998-011-9342-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9342-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12133 [article]

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Influence of dispersing additives on the conductivity of carbon black pigment dispersion / Nina Hauptman in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 553-561 Titre : Influence of dispersing additives on the conductivity of carbon black pigment dispersion Type de document : texte imprimé Auteurs : Nina Hauptman, Auteur ; Marta Klanjsek Gunde, Auteur ; Matjaž Kunaver, Auteur ; marija BeÅ¡ter-Rogac, Auteur Année de publication : 2011 Article en page(s) : p. 553-561 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption Conduction électrique Dispersions et suspensions Fourier, Spectroscopie infrarouge à transformée de Noir de carbone Index. décimale : 667.2 Colorants et pigments Résumé : The influence of dispersing additives on the electrical conductivity of carbon black pigments dispersed in an organic medium was studied. Two dispersing additives were examined in combination with two different carbon blacks, a conductive carbon black and a nonconductive one. These carbon blacks differ in the size of their aggregates and in the amounts of surface oxygen groups. Both of the additives form a monolayer when adsorbed on either of the pigment surfaces. FTIR studies showed that chemical bonding of one of the additives on the surfaces of both pigments had occurred. Conductivity decreases with increasing additive concentration, but in the case of the chemically bonded additive, the conductivity of the dispersion remained high even at higher additive loadings. This study helps in understanding the effects such additives have on the specific conductivity of composite materials that contain dispersed carbon black pigment particles. Note de contenu : EXPERIMENTAL : Materials - Size distribution of CB - Preparation of dispersions - Adsorption measurements - Conductivity measurements of suspensions - Infrared spectroscopy RESULTS AND DISCUSSION : Size distribution of CB particles - Adsorption - Specific conductivity of dispersions - FTIR studies of the dispersant's interactions with the CB surface DOI : 10.1007/s11998-011-9330-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9330-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12231 [article]

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Cathodic electrodeposition of self-curable polyepoxide resins based on cardanol / Raju Pramod Kumar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 563-575 Titre : Cathodic electrodeposition of self-curable polyepoxide resins based on cardanol Type de document : texte imprimé Auteurs : Raju Pramod Kumar, Auteur Année de publication : 2011 Article en page(s) : p. 563-575 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cardanol Couches minces Dépôt électrolytique Epaisseur -- Mesure Epoxydes Formaldéhyde Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : Cathodic electrodeposition (CED) behavior and film properties of coating binders as modified polyepoxide resins based on cardanol, a constituent of Cashew Nut Shell Liquid (CNSL), have been studied. These coating binders were synthesized by epoxidation of cardanol–formaldehyde novolacs (CNs) with epichlorohydrin and subsequently modified with secondary amine to make them water-thinnable by neutralization with acetic acid, and suitable for CED. Laboratory synthesized coating binders, modified, epoxidized cardanol–formaldehyde novolacs (MECNs), were cathodically electrodeposited on pretreated MS panels to investigate their electrodeposition behavior and film properties of deposited coating binders. Among the nine MECNs prepared by varying molar ratios of cardanol to formaldehyde as well as ECN to DEtOA, only seven MECNs (MECN1, MECN2, MECN3, MECN6, MECN7, MECN8, and MECN9) were water-soluble and electrodepositable, whereas MECN4 and MECN5 were not water soluble, and hence not considered for further studies. These seven MECNs were used for the study of their electrodeposition characteristics, such as electrodeposition yield (ED yield), coulombic yield (CY), dry film thickness (DFT), and properties of their deposited films. The most suitable molar ratio of ECN:DEtOA for the preparation of MECNs was found to be 1:1. The CN prepared by using cardanol and formaldehyde in the molar ratio of 1:0.7 was used for the preparation of ECN2 and MECN2 prepared from this was found to be the most suitable in terms of deposition behavior and overall film properties. The film of MECN2 electrodeposited at constant voltage (100 V) was found to be the best in terms of film properties along with corrosion resistance, as it passed 800-h exposure to salt spray atmosphere. MECN2 was optimized for its electrodeposition characteristics like ED yield as 3.62 mg/cm2, CY as 35.87 mg/C, and DFT as 25.26 μm. Through a wide cure window, the films of MECN2 were found to be self-curable at an optimum cure schedule of 160°C/30 min. The electrodeposited films of MECNs had good physical, chemical, and corrosion resistance properties, but demonstrated low resistance to xylene, in particular. The study emphasized the electrodeposition behavior and film properties of the prepared MECN resins as binders for CED coating formulations, which were self-curable without using any external crosslinker. The self-curing of the deposited films was achieved via a novel self-curing mechanism, i.e., one molecule chemistry through anionic polymerization. The prepared epoxide resins as MECNs could be cathodically electrodeposited as primer coat for the protection of metallic substrates against corrosion. Note de contenu : EXPERIMENTAL : Materials - Evaluation of film properties - General mechanisms of cathodic electrodeposition - Experimental design : cathodic electrodeposition of binders - Preparation of test panels - Preparation of electrolytic composition - Cathodic electrodeposition of coating binders derived from cardanol as MECNs. RESULTS AND DISCUSSION : Cure characteristics of deposited coating binders as MECNs - Optimization of the electrodeposition parameters - Current density - Electrodeposition yield - Coulombic yield - Dry film thickness - Kinetics of films growth during cathodic electrodeposition - Specific conductivity of the deposited films - measurement of gloss - Evaluation of film properties - Physical properties - Chemical resistance properties. DOI : 10.1007/s11998-011-9337-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9337-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12232 [article]

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Synthesis, photopolymerization kinetics, and thermal properties of UV-curable waterborne hyperbranched polyurethane acrylate dispersions / Wenhua Yin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 577-584 Titre : Synthesis, photopolymerization kinetics, and thermal properties of UV-curable waterborne hyperbranched polyurethane acrylate dispersions Type de document : texte imprimé Auteurs : Wenhua Yin, Auteur ; Xingrong Zeng, Auteur ; Hongqiang Li, Auteur ; Youjun Hou, Auteur ; Qiongzhi Gao, Auteur Année de publication : 2011 Article en page(s) : p. 577-584 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylates Les monomères acrylates sont un groupe d'esters faisant partie des vinyles, car renfermant une double liaison carbone-carbone et sont utilisés pour former des polyacryliques qui ont de multiples usages. Cinétique chimique Fourier, Spectroscopie infrarouge à transformée de Photoréticulation Polymères ramifiés Polyuréthanes Réticulation (polymérisation) Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : A series of UV-curable waterborne hyperbranched polyurethane acrylate dispersions (WHBPUADs) were prepared via a three-step procedure based on isophorone diisocyanate (IPDI), hyperbranched polyester (HBP), maleic anhydride (MA), and hydroxy-ethyl acrylate (HEA). The structure of WHBPUADs was characterized by Fourier transform infrared spectroscopy (FTIR) and 1H nuclear magnetic resonance spectroscopy (1H NMR). FTIR was also applied to research the effect of double bond concentration on the kinetics of photopolymerization. The heat resistance of the cured films was characterized by thermogravimetric analysis (TGA), and their mechanical properties were also measured. The results showed that the double bond conversion (Ï„) and photopolymerization rate (R p) were affected by the concentration of double bond and viscosity of WHBPUADs. The UV-curable systems with higher double bond concentration and lower viscosity led to higher Ï„ and R p. The maximum Ï„ and R p reached 93% and 71 mmol g−1 s−1, respectively. The WHBPUADs films possessed better heat resistance and mechanical properties, and with the increase of crosslink density, the heat resistance and hardnesses were further improved. Note de contenu : EXPERIMENTAL : Materials - Synthesis of WHBPUADs RESULTS AND DISCUSSION : FTIR of WHBPUAD - 1H NMR spectrum of WHBPUAD - Photopolymerization kinetics - Film mechanical properties of WHBPUADs - TGA of cured films of WHBPUADs DOI : 10.1007/s11998-011-9338-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9338-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12233 [article]

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Preparation and characterization of nanocrystalline and mesoporous strontium titanate thin films at room temperature / M. Mohammadi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 585-593 Titre : Preparation and characterization of nanocrystalline and mesoporous strontium titanate thin films at room temperature Type de document : texte imprimé Auteurs : M. Mohammadi, Auteur ; D. J. Fray, Auteur Année de publication : 2011 Article en page(s) : p. 585-593 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Matériaux nanocristallins Sol-gel, Procédé Température de laboratoire Titanate de strontium Index. décimale : 667.9 Revêtements et enduits Résumé : The low temperature perovskite-type strontium titanate (SrTiO3) thin films and powders with nanocrystalline and mesoporous structure were prepared by a straightforward particulate sol–gel route. The prepared sol had a narrow particle size distribution with hydrodynamic diameter of about 17 nm. X-ray diffraction (XRD) revealed that the synthesized powders had a perovskite-SrTiO3 structure with preferable orientation growth along the (1 0 0) direction. TEM images showed that the average crystallite size of the powders annealed in the range 300–800°C was around 8 nm. FE-SEM analysis and AFM images revealed that the deposited thin films had mesoporous and nanocrystalline structure with the average grain size of 25 nm at 600°C. Based on Brunauer–Emmett–Taylor (BET) analysis, the synthesized powders showed mesoporous structure with BET surface area in the range 92–75 m2/g at 400–600°C. One of the smallest crystallite sizes and one of the highest surface areas reported in the literature were obtained, which can be used in many applications, such as photocatalysts. Note de contenu : EXPERIMENTAL : Preparation of the strontium titanate sol - Preparation of strontium titanate thin films - Synthesis of strontium titanate powders. RESULTS AND DISCUSSION : Particle size - Crystal characterization - Thermal analysis - Microstructure - Specific surface area. DOI : 10.1007/s11998-011-9347-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9347-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12234 [article]

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Synthesis and characterization of nanoporous sodium-substituted hydrophilic titania ceramics coated on 316L SS for biomedical applications / K. Bavya Devi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 595-604 Titre : Synthesis and characterization of nanoporous sodium-substituted hydrophilic titania ceramics coated on 316L SS for biomedical applications Type de document : texte imprimé Auteurs : K. Bavya Devi, Auteur ; Kulwant Singh, Auteur ; N. Rajendran, Auteur Année de publication : 2011 Article en page(s) : p. 595-604 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable Adhésion Angle de contact Biomatériaux Caractérisation Composés inorganiques -- Synthèse Dioxyde de titane Hydrophilie Hydroxyapatite L'hydroxyapatite est une espèce minérale de la famille des phosphates, de formule Ca5(PO4)3(OH), usuellement écrite Ca10(PO4)6(OH)2 pour souligner le fait que la maille de la structure cristalline comprend deux molécules. L'hydroxyapatite est le membre hydroxylé du groupe apatite. L'ion OH- peut être remplacé par le fluor, le chlore ou le carbonate. L'hydroxyapatite cristallise dans le système hexagonal. La poudre d'hydroxyapatite pure est blanche. Celles que l'on trouve dans la nature peuvent cependant être de couleur marron, jaune ou verte. Matériaux poreux Revêtement de céramique Index. décimale : 667.9 Revêtements et enduits Résumé : Bioactive sodium-substituted titania coating on 316L SS substrate was prepared. XRD patterns exhibited the formation of a mixture of two phases (Na2Ti3O7, Na2Ti6O13) with monoclinic structure. FTIR spectra showed that the set of overlapping peaks in the range of 800–400 cm−1 are related to Ti–O and Ti–O–Ti groups. SEM-EDAX, AFM, and TEM showed the surface morphology of the coated surface to be nanoporous and uniform. The influence of the bioactivity of the coating in a simulated body fluid (SBF) medium was examined. Excellent adhesion of the ceramic composites to the substrate was achieved. The hydrophilic nature of the sodium titanate coating induced the formation of hydroxyapatite layer on the metal surface. The corrosion protection performance of the coatings has been evaluated using potentiodynamic polarization and electrochemical impedance spectroscopy measurements, which proved increased corrosion resistance of nanosodium titanate-coated 316L SS. These results imply that the sodium titanate-coated 316L SS acts as a barrier layer to the metallic substrate. Note de contenu : EXPERIMENTAL PROCEDURE : Substrate pretreatments - Synthesis of the coatings. CHARACTERIZATION TECHNIQUES : Surface characterization - Biochemical measurement. RESULTS AND DISCUSSION : Surface characterizations - Mechanical properties - In vitro characterization - Bioelectrochemical corrosion studies. DOI : 10.1007/s11998-011-9344-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9344-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12235 [article]

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Influence of pigment blends of different shapes and size distributions on coated paper properties / Nitin Kumar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 605-611 Titre : Influence of pigment blends of different shapes and size distributions on coated paper properties Type de document : texte imprimé Auteurs : Nitin Kumar, Auteur ; Nishi Kant Bhardwaj, Auteur ; Swapan Kumar Chakrabarti, Auteur Année de publication : 2011 Article en page(s) : p. 605-611 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Brillance (optique) Carbonate de calcium broyé Carbonate de calcium précipité Lumière -- Diffusion Matériaux poreux Opacifiants Papier enduit Pigments inorganiques Résistance à l'arrachement Rugosité Index. décimale : 667.9 Revêtements et enduits Résumé : Paper coating pigment plays an essential role in the achievement of the desired end paper qualities. Different pigment varieties are available for paper coating. Ground calcium carbonate (GCC) is the major one used frequently in coating formulations. Precipitated calcium carbonate (PCC) is gradually gaining importance in paper coating, as it can be prepared in different shapes and sizes. The present study was carried out to determine the influence of PCC pigments with different shapes and sizes on paper properties, and their limitations and advantages when blended with finer grade GCC. PCC pigments of calcite and aragonite crystalline polymorphs having rhombohedral, orthorhombic, and scalenohedral habits were selected for the study. It was observed that the viscosity and water-holding capacity of the coating color was reduced with the introduction of PCC in the coating formulation. The PCC pigments showed greater light scattering, opacity, and smoothness of the coated paper as compared to the GCC pigment. The clustered (rosette) shape of scalenohedral habit calcite PCC results in the greatest light scattering, opacity, and surface strength amongst all PCCs. The aragonite PCC of orthorhombic habit and calcite PCC of rhombohedral habit show an almost similar trend in coated paper properties with the greatest smoothness and paper gloss. Note de contenu : EXPERIMENTAL : Materials - Coating color preparation - paper coating aplication - Methods. RESULTS AND DISCUSSION : Characteristics I : properties that respond the same to all the PCCs tested - Characteristics II : properties that have a mixed response to the PCC tested. DOI : 10.1007/s11998-011-9354-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9354-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12236 [article]

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Influence of particle size distribution of calcium carbonate pigments on coated paper whiteness / Nitin Kumar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 613-618 Titre : Influence of particle size distribution of calcium carbonate pigments on coated paper whiteness Type de document : texte imprimé Auteurs : Nitin Kumar, Auteur ; Nishi Kant Bhardwaj, Auteur ; Swapan Kumar Chakrabarti, Auteur Année de publication : 2011 Article en page(s) : p. 613-618 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbonate de calcium broyé Carbonate de calcium précipité Lumière -- Diffusion Opacifiants Papier enduit Pigments inorganiques Taille des particules Index. décimale : 667.9 Revêtements et enduits Résumé : The optical properties of pigments used for paper coating are linked to their morphology. The light scattering through coated layers depends upon the size and the size distribution of the pigments and their packing behavior. In this report the effect of particle packing of various calcium carbonate pigments on the whiteness of the final coated paper is studied. Different grades of calcium carbonate pigments of different particle size distribution and optics were used for coating applications on base papers. Base papers of different optics were also selected. The entire study was carried out at different coat weights. It was observed that the overall scattering from the coated sheet depends upon the light scattering from the base paper as well as through the coated layer. Higher light scattering through the coated layer will lower the effect of the base paper, whether it is dark or bright. So high bright and white pigments are not only the criteria for an enhancement in the optical properties of coated paper ; the particle size and size distribution should also be considered before introducing any pigment into a coating formulation. The base optics should also be chosen on the bases of the pigments’ optics and their morphology. Note de contenu : EXPERIMENTAL : Materials - Coating color preparation - Paper coating application - Analytical techniques. RESULTS AND DISCUSSION : Effect of pigment particle size distribution on coated paper whiteness before calendering - Effect of pigment particle size distribution on coated paper whiteness after calendering. DOI : 10.1007/s11998-011-9353-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9353-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12237 [article]

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Influence of pigment on biodeterioration of acrylic paint films in Southern Brazil / Aecio M. Breitbach in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 619-628 Titre : Influence of pigment on biodeterioration of acrylic paint films in Southern Brazil Type de document : texte imprimé Auteurs : Aecio M. Breitbach, Auteur ; Janaide C. Rocha, Auteur ; Christine C. Gaylarde, Auteur Année de publication : 2011 Article en page(s) : p. 619-628 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biofilms Pigments Polyacryliques Revêtements -- Biodégradation Revêtements organiques Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : Biodeterioration of paint films leads to loss of durability and increased repainting costs. The influence of pigments on the biodeterioration of architectural paint films in the city of Florianópolis, Brazil, was evaluated using ten differently colored acrylic paint films exposed to the environment for 34 months. Fouling (biofilm formation) on the surfaces was assessed macroscopically, using British Standard BS 3900/1989 G6, and microscopically. After 20 months, major colonizers were bacteria and fungi, with some cyanobacteria and few algae; north-facing suede and peach and south-facing ice colors showed 100% cover at this time. The least affected color at all times was blue, with a maximum of 30% cover on south-facing panels after 34 months. North-facing panels were generally more fouled than South-facing. Blue, red, and ceramic colors always performed best. Resistance to fouling may have been due to copper in blue and acidity from sulfur oxides in ceramic pigments. Pigments may prolong paint film life and reduce the need for biocides. Note de contenu : MATERIALS AND METHODS : Paint formulation - Paint and pigment analysis - Test panels - Exposure regime - Evaluation of biodeterioration. RESULTS : Biodeterioration testing - Paint and pigment analysis. DOI : 10.1007/s11998-011-9350-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9350-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12238 [article]

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The influence of chromate quenching and chloride contamination level on the performance of the painted hot-dipped galvanized steel (duplex system) / Gislaine M. Bragagnolo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 629-638 Titre : The influence of chromate quenching and chloride contamination level on the performance of the painted hot-dipped galvanized steel (duplex system) Type de document : texte imprimé Auteurs : Gislaine M. Bragagnolo, Auteur ; Zehbour Panossian, Auteur ; Neusvaldo Lira de Almeida, Auteur ; Màrcio Bispo de Almeida, Auteur ; Jean V. Ferrari, Auteur ; Màrio Carlos Andreoli, Auteur ; Fernando de L. Fragata, Auteur Année de publication : 2011 Article en page(s) : p. 629-638 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. Galvanisation Revêtement métallique Zinc Index. décimale : 667.9 Revêtements et enduits Résumé : The influences of the chromate quenching step and the surface chloride contamination levels of galvanized steel on the performance of duplex systems were studied. Steel panels were galvanized in a commercial steel bath adopting three different postdipping procedures. A comparative study of the galvanized steel, both painted and nonpainted, was performed by electrochemical techniques. It was verified that the chloride contamination level of the galvanized steel surfaces is the main cause of duplex system failures. An explanation for the influence of the chromate quenching on the performance of duplex systems was presented. Note de contenu : - Nonpainted HDG panels - Painted HDG panels DOI : 10.1007/s11998-011-9349-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9349-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12239 [article]

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Thermodynamic consideration on selective surface oxidation of high strength steels prior to hot-dip galvanizing / Fang Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 639-647 Titre : Thermodynamic consideration on selective surface oxidation of high strength steels prior to hot-dip galvanizing Type de document : texte imprimé Auteurs : Fang Li, Auteur ; Huachu Liu, Auteur ; Wen Shi, Auteur ; Lin Li, Auteur Année de publication : 2011 Article en page(s) : p. 639-647 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. Aluminium L'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. Chrome Galvanisation Manganèse Oxydation Silicium Thermodynamique Index. décimale : 667.9 Revêtements et enduits Résumé : The galvanizability of high strength steel is dependent on the surface selective oxidation of alloy elements during intercritical annealing. First, this study reviewed the selective oxidation of Mn, Si, Al, Cr, and their possible products. Then we applied three sets of elemental activity data, i.e., calculated from Thermo-Calc, molar fraction, and a M (M = Mn, Si, Al, Cr) = 1 to calculate the equilibrium oxygen partial pressure of each oxidation reaction. It was found that there is a significant deviation among the results calculated from different data. Finally, this study established the stabilities and precipitation sequences of Mn–Si, Mn–Al and Mn–Cr mixed oxides, and proposed a new Mn–Cr rule to predict the oxides formed on the surface of Mn–Cr steel. Note de contenu : - SELECTIVE OXIDATIO DURING INTERCRITICAL ANNEALING - POSSIBLE OXIDE PHASE PRECIPITING DURING ANNEALING : Simple oxides - Complex oxides - THERMODYNAMICS ANALYSIS OF THE REACTIONS FOR SIMPLE OXIDES' FORMATION - THERMODYNAMICS COMPARISONS OT THE REACTIONS FOR MIXED OXIDES' FORMATION - DISCUSSIONS : Formation of simple oxides - Precipitation of mixed oxides - KINETICS CONSIDERATIONS DOI : 10.1007/s11998-011-9334-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9334-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12240 [article]

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Assessment of moisture protective properties of wood coatings by a portable NMR sensor / Payam Pourmand in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 649-654 Titre : Assessment of moisture protective properties of wood coatings by a portable NMR sensor Type de document : texte imprimé Auteurs : Payam Pourmand, Auteur ; Lin Wang, Auteur ; Sergey V. Dvinskikh, Auteur Année de publication : 2011 Article en page(s) : p. 649-654 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs Tags : 'Revêtement  bois'  Bois  Durabilité  'Résonance  magnétique  nucléaire'  'Aimant  portatif  permanent' Index. décimale : 667.9 Revêtements et enduits Résumé : We have evaluated the potential of nuclear magnetic resonance (NMR) spectroscopy based on small portable magnets for in situ assessment of moisture protective properties of wood coatings. Low field 1H NMR with a unilateral permanent magnet was used to monitor and map the local moisture content (MC) of wood specimens uncoated or coated with various types of commercial paint systems. The MC beneath a coating layer was measured with a penetration depth up to 5 mm and with a depth resolution of 0.2 mm. The method is quick, noninvasive, simple to perform, and does not require removing wooden parts from the structure. Note de contenu : EXPERIMENTAL : Materials - NMR measurements RESULTS AND DISCUSSION : Moisture content calibration - Moisture content profiles DOI : 10.1007/s11998-011-9348-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9348-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12241 [article]

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Corrosion protection of AISI 316 stainless steel by ALD alumina/titania nanometric coatings / E. Marin in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 655-659 Titre : Corrosion protection of AISI 316 stainless steel by ALD alumina/titania nanometric coatings Type de document : texte imprimé Auteurs : E. Marin, Auteur ; A. Lanzutti, Auteur ; L. Guzman, Auteur ; L. Fedrizzi, Auteur Année de publication : 2011 Article en page(s) : p. 655-659 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable Alumine Anticorrosion Dépôt de couches minces atomiques Dioxyde de titane Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Stainless steels are used today in a wide range of applications as a result of their combination of high corrosion resistance and good mechanical properties. In some applications, for example, temporary contact biomedical devices or solar water heaters, corrosion resistance may need further improvement, and surface coatings may be applied for enhanced protection. In this study, AISI 316 stainless steel samples with two different standard industrial finishes were coated using atomic layer deposition (ALD) of Al2O3/TiO2 layers. The morphology, composition and corrosion protection was then investigated using different techniques. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) were used to obtain a morphological characterization of coatings and substrates. Glow discharge optical emission spectrometry (GDOES) was used to obtain an in-depth profile of composition. Polarization curves in a 0.2 M NaCl solution were used to evaluate the corrosion protection given by the coatings. The deposited ALD layers were found to be almost flawless. The measured RMS roughness values were compared before and after the ALD, and were around 50 and 370 nm for the two samples. GDOES profiles were strongly influenced by the roughness of the substrate. The corrosion protection obtained on AISI 316 stainless steel by the application of nanometric coatings proved to be very effective in reducing the passive region current density from 10−7 to less than 10−9 A/cm2 and increasing the passive region potential interval from 0.8 to 1.3 V before breakdown. DOI : 10.1007/s11998-011-9327-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9327-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12242 [article]

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