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The effect of superhydrophobic surface topography on underwater corrosion resistance of steel / Keqin Zheng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)
[article]
Titre : The effect of superhydrophobic surface topography on underwater corrosion resistance of steel Type de document : texte imprimé Auteurs : Keqin Zheng, Auteur ; Jinde Zhang, Auteur ; Erin Keaney, Auteur ; Hanna Dodiuk, Auteur ; Samuel Kenig, Auteur ; Carol Barry, Auteur ; Joey Mead, Auteur Année de publication : 2021 Article en page(s) : p. 685-693 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
Hydrophobie
Matériaux hybrides
Métaux -- Revêtements protecteurs
Revêtements organiques
Surfaces (Physique)
TopographieIndex. décimale : 667.9 Revêtements et enduits Résumé : This article describes the study of the topography effect of superhydrophobic surfaces on the corrosion protection performance of steel through the air plastron behavior when subjected to an underwater environment. A random superhydrophobic surface was fabricated using spray coating and characterized for morphology and wettability by scanning electron microscopy (SEM) and goniometer measurements, respectively. By comparing the coated surfaces both with and without air plastron, it was found that superhydrophobicity postponed the corrosion of the coated steel specimens. This increase in corrosion protection of the superhydrophobic surface was due to the air plastron created by the superhydrophobicity in underwater immersion. Since different areas showed differing air plastron lifetimes (wetting behavior), it was assumed that the underlying topography of the superhydrophobic coating controlled the air plastron lifetime. To investigate this behavior, the micron scale topography of the different areas was studied using the technique of laser confocal microscopy over the specific areas and correlating with air plastron lifetime. Using the theoretical analysis based on superhydrophobic robustness and assuming the solid fraction is the same for different locations, it was demonstrated that the feature size [extracted by roughness analysis as root-mean-square (RMS)] correlated with the air plastron lifetime. It was confirmed from the plot of RMS and air plastron lifetime that smaller feature sizes could extend the air plastron lifetime and provide better anticorrosion performance. Note de contenu : - EXPERIMENTAL : Materials - Pretreatment of steel substrate - Preparation of superhydrophobic coating - Wettability characterization - Air plastron real-time observation - Corrosion resistance evaluation - Topography characterization
- RESULTS AND DISCUSSION : Plastron real-time observation - Corrosion resistance of superhydrophobic coatings - The effect of topography on air plastron lifetimeDOI : https://doi.org/10.1007/s11998-020-00433-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00433-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35922
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Code-barres Cote Support Localisation Section Disponibilité 22785 - Périodique Bibliothèque principale Documentaires Disponible The effect of surface preparation grades of weld seams on coating performance / Sang-Moon Shin in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 7 (07/2018)
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Titre : The effect of surface preparation grades of weld seams on coating performance Type de document : texte imprimé Auteurs : Sang-Moon Shin, Auteur ; Chung-Seo Park, Auteur ; Seung-Gon Choo, Auteur ; Eun-Ha Song, Auteur ; Han-Jin Bae, Auteur Année de publication : 2018 Article en page(s) : p. 44-48 Langues : Américain (ame) Catégories : Anticorrosion
Epaisseur -- Mesure
Epoxydes
Essais de brouillard salin
Evaluation visuelle
Lignes de soudure
Métaux -- Revêtements protecteurs
Métaux -- Revêtements:Métaux -- Peinture
Métaux -- Surfaces
Résistance à la fissuration
Traîtements de surfaceIndex. décimale : 667.9 Revêtements et enduits Résumé : According to the international surface preparation standard for welds (ISO 8501-3, "Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 3 : Preparation grades of welds, edges and other areas with surface imperfections"), the preparation grades before paint application are divided into three levels: P1, P2 and P3 (Fig.a). These grades are described with rough qualitative representations instead of with descriptions of surface treatment methods or mesurable conditions. Because of the ambiguous wording in the standard, there have been a lot of argument about surface preparation grades and abraded condition during construction.
In this study, coating thickness, the corrosion resistance and crack tendency of the coated films on the welds were evaluated for the grinding range in five levels from mild to servere. Each ground specimen was blasted to Sa 2.5 and coated with two coats of epoxy paints. The performance of coating on welds with the grades of grinding condition were not significantly different, satisfying the criteria of ISO 12944-5, "Paints and varnishes - Corrosion protection of steel structures by protective paint systems - Part 5 : Protective paint systems" (C5-M medium). After blasting, all ground specimens showed smooth surfaces that did not result in a sharp edge or excessive film thickness.Note de contenu : - Visual inspection of surface treatment on the welding line
- Measurement of coating film thickness on the welding line
- Corrosion resistance
- Crack resistance
- Fig. 1 : Cross section of a typical weld bead
- Fig. 2 : Configuration of the test specimens: T-bar (top) and weld (bottom)
- Fig. 3 : Crack resistance test results (the number of cycles of crack initiation)
- Table 1 : Appearance of specimens with five grades of surface preparation
- Table 2 : Test coating system
- Table 3 : Results of coating film-thickness measurements in µm
- Table 4 : Rust creepage from the scribe line after salt-spray exposure for 1,440 HoursPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31888
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Code-barres Cote Support Localisation Section Disponibilité 20085 - Périodique Bibliothèque principale Documentaires Disponible The effect of TiO2, pigmentation on the hydrolysis of amino resin crosslinked epoxy can coatings / Saminu Musa Magami in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 6 (11/2014)
[article]
Titre : The effect of TiO2, pigmentation on the hydrolysis of amino resin crosslinked epoxy can coatings Type de document : texte imprimé Auteurs : Saminu Musa Magami, Auteur ; Peter K. T. Oldring, Auteur ; Laurence Castle, Auteur ; James Thomas Guthrie, Auteur Année de publication : 2014 Article en page(s) : p. 1013-1022 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anhydrides
Can coating
Dioxyde de titane
Epoxydes
Hydrolyse
MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde.
RéticulantsIndex. décimale : 667.9 Revêtements et enduits Résumé : Pigmented (TiO2), amino resin crosslinked coatings, designed for applications in can coatings’ internal lacquers, were formulated, characterized, applied, and cured. Three grades of a pigmentary form of TiO2 were characterized in terms of their particle size, their particle morphology, their zeta potential, and their moisture retention behavior. Epoxy coatings that were crosslinked using one of several, different amino crosslinkers were prepared. The effect of the presence of the TiO2 pigments on the hydrolysis of the cured coatings was monitored via the controlled retorting of the coatings. The different grades of TiO2 pigment were selected, to establish whether or not they could be used interchangeably with respect to hydrolysis and to melamine release. Also, the effects of the aging of the fluid coatings on the amount of melamine released from the coatings (after curing and retorting) were monitored. Storage under laboratory conditions for 2, 20, and 40 weeks was used for this purpose. The TiO2 pigment contributed significantly to the hydrolysis behavior of the epoxy coatings in that their presence substantially reduced the amount of melamine released and the extent of crosslinker hydrolysis. Typical results show that excluding the TiO2 pigment particles from the formulation results in there being 50% more hydrolysis of the crosslinker to melamine. With respect to the melamine release and crosslinker hydrolysis, the different grades of the pigment gave similar results. Note de contenu : - MATERIALS : Analysis of TiO2 - Preparation of the "model" epoxy-anhydride coatings - Coating application and curing - Surface microscopy of coatings and contact angle studies : epoxy-anhydride coatings - Retort of coatings/hydrolysis tests : epoxy-anhydride coatings - Determination of the melamine released by the epoxy-anhydride coatings
- RESULTS AND DISCUSSION : Behavior of the TiO2 pigment species - Effect of pigmentary TiO2 on the hydrolysis of cured epoxy-anhydride coatings to melamineDOI : 10.1007/s11998-014-9610-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9610-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22357
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Code-barres Cote Support Localisation Section Disponibilité 16659 - Périodique Bibliothèque principale Documentaires Disponible The first polyurethane wind rotor blade made in Asia / Kim Klausen in JEC COMPOSITES MAGAZINE, N° 108 (10/2016)
[article]
Titre : The first polyurethane wind rotor blade made in Asia Type de document : texte imprimé Auteurs : Kim Klausen, Auteur ; Jirabhat Lerlertwanich, Auteur ; Yuan Cheng, Auteur Année de publication : 2016 Article en page(s) : p. 27-29 Langues : Anglais (eng) Catégories : Colles:Adhésifs
Composites à fibres de verre
Composites à fibres de verre -- Moulage par infusion
Eoliennes -- Matériaux
Epoxydes
Polyuréthanes
RotorsIndex. décimale : 620.11 Matériaux (propriétés, résistance) Résumé : This article presents the successful trial of a 1.5-MW polyurethane wind rotor blade made with a newly-developed polyurethane resin in China, which made a great impression in the wind energy industry. The blade is 37.5 metres long and weighs around 6 metric tons. It was made with glass fibre fabrics from Chongqing Polycomp International Corp. (CPIC) and processed with a polyurethane online infusion machine from HÃœBERS, a specialist in process engineering, at the Shanghai FRP Research Institute. Note de contenu : - Influsion and impregnation without voids
- Optimized cost efficiency
- Successful prototyping
- Faster infusion and curing
- Larger rotor blades with optimized design
- PU system technology with high output rate
FIGURES : 1. As demonstrated by measuring the lap shear-strength, the PU resin's adhesion is significantly better than that of epoxy resin. Even the adhesion of the EP infusion resin to the PU substrate is superior to that on the EP substrate - 2. Regardless of the thickness, the epoxy adhesive shows better adhesion to the PU substrate than to the EP substratePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28171
in JEC COMPOSITES MAGAZINE > N° 108 (10/2016) . - p. 27-29[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18400 - Périodique Bibliothèque principale Documentaires Disponible The improvement of ecological characteristics of coatings from cured epoxy resins by hot water extraction / Tomasz Jelinski in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 6 (11/2016)
[article]
Titre : The improvement of ecological characteristics of coatings from cured epoxy resins by hot water extraction Type de document : texte imprimé Auteurs : Tomasz Jelinski, Auteur ; Piotr Cysewski, Auteur Année de publication : 2016 Article en page(s) : p. 1047-1053 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amines Une amine est un composé organique dérivé de l'ammoniac dont certains hydrogènes ont été remplacés par un groupement carboné. Si l'un des carbones liés à l'atome d'azote fait partie d'un groupement carbonyle, la molécule appartient à la famille des amides. Découvertes en 1849, par Wurtz les amines furent initialement appelées alcaloïdes artificiels.
On parle d'amine primaire, secondaire ou tertiaire selon que l'on a un, deux ou trois hydrogènes substitués.
Par exemple, la triméthylamine est une amine tertiaire, de formule N(CH3)3.
Typiquement, les amines sont obtenues par alkylation d'amines de rang inférieur. En alkylant l'ammoniac, on obtient des amines primaires, qui peuvent être alkylées en amines secondaires puis amines tertiaires. L'alkylation de ces dernières permet d'obtenir des sels d'ammonium quaternaire.
D'autre méthodes existent : 1. Les amines primaires peuvent être obtenues par réduction d'un groupement azoture, 2. Les amines peuvent aussi être obtenues par la réduction d'un amide, à l'aide d'un hydrure, 3. L'amination réductrice permet l'obtention d'amines substituées à partir de composés carbonylés (aldéhydes ou cétones), 4. Les amines primaires peuvent être obtenues par la réaction de Gabriel.
Epoxydes
Extraction (chimie)
RéticulantsIndex. décimale : 667.9 Revêtements et enduits Résumé : Amine curing agents pose serious health hazards and controlling their release is crucially important. Extraction of unbounded amine from cured epoxy polymers can improve the ecological characteristics of such products. Even 1 min exposure of cured epoxy resins to hot water reduces three- to ten-fold the residual amount of amine present in the epoxy polymer. Different temperatures and extraction times were tested, enabling the selection of the most optimal extraction conditions, which correspond to 5 min of heating in 100°C. This additional cost-effective extraction step is very easy to perform and leads to a significant reduction of unbounded curing agent, making cured epoxy resins much more eco-friendly products. The documented positive and linear trends of logarithms of viscosity and the amount of released amine suggest the selection from such curing agents and such epoxy resins that are characterized by lowest possible viscosities, which guarantees that there is only a low amount of unbounded amine that needs to be released from the polymer. Note de contenu : - MATERIALS AND METHODS : Materials - Procedure and measurements
- RESULTS AND DISCUSSION : Calibration curves validation - Optimization of unbounded curing agent removalDOI : 10.1007/s11998-016-9816-2 En ligne : http://link.springer.com/content/pdf/10.1007%2Fs11998-016-9816-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27259
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