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Adhesion tendency of polymers to hard coatings / M. Rebelo de Figueiredo in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 4 (08/2013)
[article]
Titre : Adhesion tendency of polymers to hard coatings Type de document : texte imprimé Auteurs : M. Rebelo de Figueiredo, Auteur ; C. Bergmann, Auteur ; C. Ganser, Auteur ; C. Teichert, Auteur ; Christian Kukla, Auteur ; C. Mitterer, Auteur Année de publication : 2013 Article en page(s) : p. 415-420 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion
Dureté (matériaux)
Energie de surface
Mesure
Moules d'injection
Nitrure de chrome
Polyamide 66
Polyéther éther cétone
Polyoxyméthylène
Pulvérisation cathodique
Revêtement métallique
Spectroscopie Raman
Tribologie (technologie)Index. décimale : 668.4 Plastiques, vinyles Résumé : The adhesion tendency of the polymers polyoxymethylene , polyamide 6.6 and polyether ether ketone against hard coatings to protect molds in polymer processing was evaluated by a combination of tribological tests, investigations of wear tracks and measurements of the coatings’ surface energies. It was found that a low surface roughness and a low surface energy of the coating are beneficial to reduce friction and adhesion tendency. Among the coating materials investigated, CrN seems to be the most promising candidate for the protection of molds for polymer processing. DOI : 10.3139/217.2767 En ligne : https://drive.google.com/file/d/1J1hu0CSNp6ErJFQn18IoHiy3BEAD1K_v/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19286
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Code-barres Cote Support Localisation Section Disponibilité 15396 - Périodique Bibliothèque principale Documentaires Disponible Alternative corrosion protection pretreatments for aluminum alloys / A. F. Carreira in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 4 (07/2017)
[article]
Titre : Alternative corrosion protection pretreatments for aluminum alloys Type de document : texte imprimé Auteurs : A. F. Carreira, Auteur ; A. M. Pereira, Auteur ; E. P. Vaz, Auteur ; A. M. Cabral, Auteur ; T. Ghidini, Auteur ; L. Pigliaru, Auteur ; T. Rohr, Auteur Année de publication : 2017 Article en page(s) : p. 879-892 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages
Essais de brouillard salin
Métaux -- Revêtements protecteurs
Microscopie électronique à balayage
Revêtement métallique
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Aluminum alloys are extensively used in space programs for both structural and nonstructural applications. As is well known, the corrosion resistance of these alloys is quite limited and anticorrosion treatment is needed. Currently, the treatment most often used for improving the corrosion resistance of aluminum alloys is chromate (CrVI-based) conversion coatings (CCC). Due to the high environmental impact of these compounds, the REACH Regulation of the European Union decided to limit/restrict the use of hexavalent chromium. A sunset date of mid-2017 has been already set. For the time being, many chromate-free alternative products are available, but they have been found to be significantly inferior in terms of corrosion protection performances with respect to the chromate options. In this regard, there is a great need to develop high-performance hexavalent chromium-free anticorrosion coatings with low environmental impact and conformity with the EU regulations. The European Space Agency (ESA) is currently involved in a frame contract with Instituto de Soldadura e Qualidade (ISQ) that is currently ongoing. The objective of this study is to evaluate the anticorrosion behavior of the different alternative pretreatments applied to the most used aluminum alloys. The outcome of this activity will be the identification and the optimization of the most promising anticorrosion pretreatment. Several commercial Cr(VI)-free processes were applied onto aluminum alloys (2024-T3 and 2024-T81) used in the construction of ESA spacecraft in order to investigate their anticorrosive properties compared with Alodine 1200, a widely used conventional CCC. One of these commercial processes presented good anticorrosion performance, even better than Alodine 1200, and these results are presented in this paper. Salt spray resistance is included in the testing program as well as metallurgical coating evaluations that include microscopy observations before and after testing and electrochemical impedance spectroscopy in order to evaluate surface and microstructural modifications due to degradation mechanisms. Further studies must be performed with this promising alternative, modifying application parameters in order to achieve improved corrosion protection efficiency. Note de contenu : EXPERIMENTAL : Preparation of the metallic substrates - Pretreatments - Coating morphology and composition characterization - Impedance measurements - Salt spray testing
- RESULTS AND DISCUSSION : Coating morphology - Impedance measurements - Salt spray testingDOI : 10.1007/s11998-017-9922-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9922-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28930
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Code-barres Cote Support Localisation Section Disponibilité 19194 - Périodique Bibliothèque principale Documentaires Disponible Application of CuCoMnOx coat by sol gel technique on aluminum and copper substrates for solar absorber application / Nahed El Mahallawy in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 6 (11/2014)
[article]
Titre : Application of CuCoMnOx coat by sol gel technique on aluminum and copper substrates for solar absorber application Type de document : texte imprimé Auteurs : Nahed El Mahallawy, Auteur ; Madiha Shoeib, Auteur ; Yehia Ali, Auteur Année de publication : 2014 Article en page(s) : p. 979-991 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cobalt
Complexes métalliques
Cuivre
Manganèse
Revêtement métallique
Revêtements -- Propriétés optiques
Sol-gel, Procédé
Surfaces (technologie)Index. décimale : 667.9 Revêtements et enduits Résumé : Solar thermal heaters are used widely in domestic and industrial applications. The main part of solar thermal heaters is the absorber surface which must have a maximum absorptivity (α) and minimum emissivity (ε) of solar radiation. This is achieved by application of selective coating on the absorber surface. In the present work, solar selective CuCoMnO x spinel films are deposited by sol gel technique using a dip-coating technique on copper and aluminum sheets. The precursor’s ratio Co:Cu:Mn applied is 1:3:3. Different precursor molar ratios were combined with a fixed amount of solvents for the coating process. Process parameters such as withdrawal rate, heat treatment, and substrate materials on the coat characteristics and optical properties were studied. The coated metallic samples were heat treated at 450°C for 30 min in the case of aluminum and at 200°C at different times in the case of copper. Optical properties of the coatings, namely absorptivity (α) and emissivity (ε) were measured and the deposition process parameters were optimized in order to produce the maximum selectivity (α/ε) values. The deposition parameters were found to influence both the thickness and surface roughness of the coatings. As the coating thickness decreases, the absorptivity increases while the emissivity decreases irrespective of the substrate material. It was also observed from the results that when applying the coat on aluminum substrates, a maximum selectivity value of (α/ε) = 31 was realized while for the copper substrates a maximum value of (α/ε) = 81.8 was obtained. The deposited coatings were analyzed using SEM, XRD, and AFM. Note de contenu : - METHODOLOGY
- RESULTS AND DISCUSSION : Effect of different solution concentrations on optical properties of coated aluminium
- EFFECT OF HEAT TREATMENT TIME ON COPPER-COATED SAMPLES : Effect of treatment time on coat optical properties - Effect of coat thickness on optical properties of copper-coated samples
- EFFECT OF WITHDRAWAL RATE ON OPTICAL PROPERTIES OF COPPER AND ALUMINUM SUBSTRATES
- EFFECT OF COAT THICKNESS AND ROUGHNESS ON OPTICAL PROPERTIES
- SURFACE CHARACTERIZATION OF THE COATDOI : 10.1007/s11998-014-9592-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9592-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22320
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Code-barres Cote Support Localisation Section Disponibilité 16659 - Périodique Bibliothèque principale Documentaires Disponible Atomic force microscopy analysis of cathodic arc ion-plated CrN and CrC coatings / Kong Dejun in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)
[article]
Titre : Atomic force microscopy analysis of cathodic arc ion-plated CrN and CrC coatings Type de document : texte imprimé Auteurs : Kong Dejun, Auteur ; Zhu Shouyu, Auteur Année de publication : 2018 Article en page(s) : p. 781-787 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbure de chrome
Nitrure de chrome
Revêtement métalliqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Coatings of CrN and CrC were deposited on a YT14 cemented carbide cutting tool using cathodic arc ion plating (CAIP). The surface and interface morphologies of the as-obtained CrN and CrC coatings were analyzed using a field emission scanning electron microscope. The heights, particle diameters and power spectral densities of CrN and CrC coatings were analyzed using atomic force microscopy and the correlated parameters of roughness were obtained. The results show that the roughness of the CrN and CrC coatings is 81.7 × 10−3 and 70.2 × 10−3 nm, respectively, and CAIP has little effect on the CrN and CrC coating roughness. The height of the peak values of CrN and CrC coatings is 0.498 and 0.502 nm, respectively, and the reduction friction of the CrN coating was slightly better than that of the CrC coating. The average particle diameter of the CrN and CrC coatings is 6.575 × 102 and 7.678 × 102 nm, respectively, and the particles are uniformly distributed with no large-scale fluctuations. The power between the cursors of the CrN and CrC coatings is 1.44 × 10−2 and 9 × 10−3 nm2, respectively, with the power spectral density of the CrN coating being the dominant frequency. Note de contenu : - Surface and interface morphologies
- Atomic force topographies
- Height analysis
- Analysis of particle diameters
- Analysis of power spectraDOI : 10.1007/s11998-017-0034-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0034-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30856
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Code-barres Cote Support Localisation Section Disponibilité 20078 - Périodique Bibliothèque principale Documentaires Disponible BRDF characterization of Al-coated thermoplastic polymer surfaces / Tommaso Fontanot in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 5 (09/2020)
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Titre : BRDF characterization of Al-coated thermoplastic polymer surfaces Type de document : texte imprimé Auteurs : Tommaso Fontanot, Auteur ; Jan Audenaert, Auteur ; Peter Hanselaer, Auteur ; Ilaria Pecorari, Auteur ; Vanni Lughi, Auteur ; Erik Vesselli, Auteur ; Sara Paroni, Auteur ; Frédéric Bernard Leloup, Auteur Année de publication : 2020 Article en page(s) : p. 1195–1205 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 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.
Analyse quantitative (chimie)
Caractérisation
Couches minces
Microscopie à force atomique
Réflectance
Revêtement métallique
Rugosité
ThermoplastiquesUne matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire.Index. décimale : 667.9 Revêtements et enduits Résumé : In this paper, we present a combined morphological and optical characterization of aluminum-coated thermoplastic polymer surfaces. Flat plastic substrates, obtained by means of an injection molding process starting from plastic granules, were coated with ultra-thin aluminum films evaporated in vacuo, on top of which a silicon-based protective layer was plasma deposited in order to prevent oxidation of the metal reflective surface. Different sample treatments were studied to unravel the influence of substrate chemistry, substrate thickness, aluminum and protective layer thickness, and surface roughness on the actual optical reflectance properties. Bidirectional reflectance distribution function measurements, corroborated by surface morphological information obtained by means of atomic force microscopy, correlate reflectance characteristics with the root-mean-square surface roughness, providing evidence for the role of the substrate and the thin films’ morphology. The results unravel information of interest within many applicative fields involving metal coating processes of plastic substrates as an example in the case of automotive lighting. Note de contenu : - MATERIALS AND METHODS : Sample preparation - Optical characterization - Atomic force microscopy (AFM)
- RESULTS AND DISCUSSION : AFM characterization - Role of the substrate - Role of the Al film - Role of the protective layer - Quantitative analysisDOI : https://doi.org/10.1007/s11998-020-00361-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00361-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34566
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