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Effect on the corrosion resistance property of aluminum substrate by altering the wetting behavior / Poonam Chauhan in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)
[article]
Titre : Effect on the corrosion resistance property of aluminum substrate by altering the wetting behavior Type de document : texte imprimé Auteurs : Poonam Chauhan, Auteur ; Kushal Yadav, Auteur ; Aditya Kumar, Auteur Année de publication : 2023 Article en page(s) : p. 16389-1648 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acides
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.
Anticorrosifs
Anticorrosion
Caractérisation
Gravure
Hydrophobie
Rugosité
Spectroscopie d'impédance électrochimique
Traîtements de surfaceIndex. décimale : 667.9 Revêtements et enduits Résumé : For engineering systems like vehicles, pipelines, aircraft, and ships, corrosion in aluminum metal is a serious operational and financial challenge. In this paper, a facile and effective strategy was applied to develop superhydrophilic, hydrophilic (inherent nature), hydrophobic, and superhydrophobic surfaces via the different surface treatments. Superhydrophobic surfaces were fabricated at different roughness scales using three different acidic etchants, namely, hydrochloric acid (HCl), hydrochloric acid and nitric acid (HCl + HNO3), and hydrochloric acid and cupric chloride dihydrate (HCl + CuCl2.2H2O) followed by the low surface energy material (hexadecyltrimethoxysilane). Then, the corrosion behavior of the different surfaces was assessed. The surface treatment and coating deposition characterizations of the samples were investigated by surface morphology, surface roughness, and wettability measurements. Each sample displayed distinct water contact and sliding angles based on its surface treatment. Additionally, an effect on the corrosion property of uncoated and all treated samples was studied in detail by electrochemical impedance spectroscopy. The results demonstrated that superhydrophobic and hydrophobic surfaces could improve corrosion resistance compared to uncoated aluminum. Note de contenu : - Metal substrate and chemicals
- Fabrication of hydrophobic and superhydrophobic surfaces
- Characterization
- Table 1 : The values of WCAs, SA, advancing and receding angles, and CAH for uncoated, treated with HDTMS, and all etched surfaces (HCl, HCl + HNO3, and HCl + CuCl2.2H2O) with and without HDTMS treatment
- Table 2 : The values of surface roughness parameters of all samples measured by 3D noncontact optical surface profilometerDOI : https://doi.org/10.1007/s11998-023-00768-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00768-5.pdf?pdf=button Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39977
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Code-barres Cote Support Localisation Section Disponibilité 24242 - Périodique Bibliothèque principale Documentaires Disponible Effective incorporation of ZnO nanoparticles by miniemulsion polymerization in waterborne binders for steel corrosion protection / Stefano Chimenti in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 4 (07/2017)
[article]
Titre : Effective incorporation of ZnO nanoparticles by miniemulsion polymerization in waterborne binders for steel corrosion protection Type de document : texte imprimé Auteurs : Stefano Chimenti, Auteur ; Jesús Manuel Vega, Auteur ; Miren Aguirre, Auteur ; Eva GarcÃa-Lecina, Auteur ; José Antonio DÃez, Auteur ; Hans-Jurgen Grande, Auteur ; MarÃa Paulis, Auteur ; Jose Ramon Leiza, Auteur Année de publication : 2017 Article en page(s) : p. 829-839 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
Liants
Métaux -- Revêtements protecteurs
Miniémulsions
Nanoparticules
Oxyde de zinc
Polymérisation en émulsion
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : A nanohybrid waterborne binder was synthesized by miniemulsion polymerization with the incorporation of ZnO nanoparticles in order to increase the corrosion protection capability. This system was compared to a neat waterborne binder and to a physical blend of the binder with an aqueous ZnO nanoparticles dispersion. The hybrid dispersion was characterized by SEM and TEM, while the corrosion behavior of these latexes was investigated by electrochemical measurements (open circuit potential and electrochemical impedance spectroscopy in 3.5 wt% NaCl solution), evaluating the effect of the incorporation of these nanoparticles into the polymeric matrix. The incorporation of ZnO nanoparticles by blending showed similar behavior to the neat coating despite flash rust reduction on the metal surface. In contrast, the hybrid binder prepared by miniemulsion polymerization has shown the best performance according to the values of pore resistance (Ri) and coating capacitance (Cc). In general, this study shows how useful can be the miniemulsion polymerization methodology to design hybrid coating formulations, obtaining homogenous distribution of ZnO nanoparticles within the film. Indeed, a heterogeneous distribution can hinder the effectiveness and the corrosion protection capabilities of promising nanoparticles. Note de contenu : - EXPERIMENTAL : Materials - Miniemulsion polymerizations and blend preparation - Coating application - Characterization methods
- RESULTS AND DISCUSSION : ZnO nanoparticles wettability - Polymerization kinetics - Film formation - Corrosion evaluationDOI : 10.1007/s11998-017-9958-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9958-x.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28925
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Code-barres Cote Support Localisation Section Disponibilité 19194 - Périodique Bibliothèque principale Documentaires Disponible Effective protection for vineyard machines in INTERNATIONAL SURFACE TECHNOLOGY (IST), Vol. 12, N° 4 (2019)
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Titre : Effective protection for vineyard machines Type de document : texte imprimé Année de publication : 2019 Langues : Anglais (eng) Catégories : Anticorrosifs
Anticorrosion
Machines agricoles -- Peinture
Métaux -- Revêtements protecteurs
Primaire (revêtement)
Résistance chimique
Revêtements poudre:Peinture poudreIndex. décimale : 667.9 Revêtements et enduits Résumé : The components of vineyard machines that are used to automate the grape harvest require the best possible corrosion protection, as they are exposed to weather conditions, tartaric acid from the grapes, and chemicals. To ensure this, one manufacturer of these machines relies on a proven system consisting of a primer and a low temperature powder coating as a corrosion protection coating. Note de contenu : - Coating shop integrated into the new factory
- Manual application in two coats
- Fig. 1 : The self-driving grape harvesters are exposed to tartaric acid from the grapes and to other chemicals and therefore require very good corrosion protection
- Fig. 2 : The primer and the top coat are applied manually in a walk-in booth
- Fig. 3 : The primer and powder coating are cured in two ovens at 190°C to 200° for a maximum of 30 minutes
- Fig. 4 : The colors required were accurately reproduced in the laboratoryPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33862
in INTERNATIONAL SURFACE TECHNOLOGY (IST) > Vol. 12, N° 4 (2019)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21377 - Périodique Bibliothèque principale Documentaires Disponible Effects of conductive polymers (type and concentration) in coatings with zinc particles of different shapes / M. Kohl in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 4 (07/2019)
[article]
Titre : Effects of conductive polymers (type and concentration) in coatings with zinc particles of different shapes Type de document : texte imprimé Auteurs : M. Kohl, Auteur ; A. Kalendova, Auteur ; Pravin P. Deshpande, Auteur ; E. Schmidova, Auteur Année de publication : 2019 Article en page(s) : p. 949-962 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion
Anticorrosifs
Anticorrosion
BenzoatesUn benzoate est un sel de l'acide benzoïque (C6H5COOH ou C7H6O2) qui est un acide carboxylique aromatique dérivé du benzène.
Les benzoates sont notamment utilisés dans l'industrie alimentaire comme additifs :
- Le benzoate de sodium (Na+ + C6H5COO-), référencé en Europe sous le code « E211 »
- Le benzoate de potassium (K+ + C6H5COO-), référencé en Europe sous le code « E212 »
- Le benzoate de calcium (Ca2+ + (C6H5COO-)2), référencé en Europe sous le code « E213 »
Composés lamellaires
Conducteurs organiques
Essais accélérés (technologie)
Formulation (Génie chimique)
Particules (matières)
Polyaniline
Poudres métalliques
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Revêtements organiques
ZincIndex. décimale : 667.9 Revêtements et enduits Résumé : The objective of this work was to compare the anticorrosion effects of organic coatings containing zinc metal consisting of either lamellar particles or isometric particles and to reduce the zinc metal content of the coatings while preserving their high anticorrosion efficiency. The optimization and Zn metal content reduction can be achieved using zinc with a lamellar particle shape and application of conductive polymers. Conductive polymers are expected to enhance the electrochemical effect of zinc metal in paints. Organic coatings with lamellar zinc particles also exhibit better mechanical properties. Optimization of the amount of zinc lamellar particles could promote a wider use of this material in anticorrosion paints. The conductive polymers used in this work included polyaniline phosphate, polyaniline benzoate, and carbonized polyaniline. A solvent-based epoxy–ester resin served as the binder. Model paints consisting of this resin and containing different concentrations of polyaniline phosphate, polyaniline benzoate, and carbonized polyaniline were prepared. The paints were tested at the critical pigment volume concentration (CPVC) of Zn dust and at lower Zn dust concentrations, specifically 2% below the CPVC. The paints containing combinations of zinc and a conductive polymer contained the sum of the pigments just below the CPVC of the zinc dust species used. This implies a level of 39% of (PVCZn-lam) for the systems with lamellar zinc and a level of 61% of (PVCZn–sf) for the systems with spherical zinc. The pigment volume concentration (PVC) of the conductive polymers in the zinc-containing paints was (based on results obtained previously) 1%, 5%, and 10% in the systems with lamellar zinc and 1%, 5%, 10%, and 15% in the systems with spherical zinc. The organic coatings were subjected to accelerated cyclic corrosion tests and electrochemical measurements. The sample containing polyaniline carbonate (PVC = 1%) and spherical zinc exhibited a significantly lower corrosion rate as compared to that of uncoated steel. Note de contenu : - EXPERIMENTAL PART : Synthesis of conductive polymers - Pigment parameter determination - Specification of the binder for coatings - Formulation and preparation of the organic coatings - Mechanical properties of the paints - Corrosion test procedures - Potentiodynamic polarization studies
- RESULTS AND DISCUSSION : Pigment specification - Evaluation of accelerated corrosion tests - Potentiodynamic polarization studies - Results of adhesion properties of the protective organic coatings - Characterizing the organic coating composition - Summary of the results of the adhesion properties and accelerated corrosion testsDOI : 10.1007/s11998-018-00169-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00169-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32852
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Code-barres Cote Support Localisation Section Disponibilité 21127 - Périodique Bibliothèque principale Documentaires Disponible Effects of different dicarboxylic acid on the UV-curable urethane resins made from palm fatty acid distillate / Kim Teck Teo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 6 (11/2020)
[article]
Titre : Effects of different dicarboxylic acid on the UV-curable urethane resins made from palm fatty acid distillate Type de document : texte imprimé Auteurs : Kim Teck Teo, Auteur ; Aziz Hassan, Auteur ; Seng Neon Gan, Auteur Année de publication : 2020 Article en page(s) : p. 1571-1585 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Brillance (optique)
Caractérisation
Copolymère uréthane acrylique
Essai de dureté
Essais accélérés (technologie)
Essais de brouillard salin
Essais dynamiques
Métaux -- Revêtements protecteurs
Poids moléculaires
Résistance à la fissuration
Résistance au chocs
Résistance chimique
Revêtements -- Propriétés mécaniques
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements organiques
Transition vitreuse
Vernis -- Propriétés mécaniquesIndex. décimale : 667.9 Revêtements et enduits Résumé : A series of four polyol macromers with similar hydroxyl number was prepared by reacting palm fatty acid distillate with neopentaglycol, pentaerythritol, and separate equimolar amounts of isophthalic acid (IPA), terephthalic acid (TPA), phthalic anhydride (PA), and adipic acid (AA). Each macromer was then copolymerized with 2-hydroxylethyl acrylate (2-HEA) and toluene diisocyanate to produce the UV curable resins labeled as UA-IPA, UA-TPA, UA-PA, and UA-AA, respectively. The glass transition temperature (Tg), pendulum hardness, and adhesion properties of the cured films were studied. In general, all the resins produced coatings with high gloss and good adhesion. When accelerated weathering tests were carried out, films of UA-TPA could withstand UVA exposure up to 1500 h. When subjected to methyl ethyl ketone double rub test, cured films of UA-IPA and UA-TPA could withstand the highest double rubs at 90 times, followed by UA-PA and UA-AA at 45 and 15 times, respectively. Under salt spray corrosion test for 720 h, cured films showed good corrosion resistance with no observable blistering, except for UA-AA that showed slight blistering. Excellent water resistance was achieved by all cured films with good adhesion and minimal gloss reduction. Note de contenu : - EXPERIMENTS : Materials - Synthesis of hydroxyl terminated macromer - Urethane acrylate resins (UA) - Clearcoat formulation - Application of UA clearcoat on metal panel - FTIR analysis - Molecular weight measurement - Glass transition measurement - Pendulum hardness - Acid value and isocyanate value - Hydroxyl number - Adhesion performance - Pencil hardness - Gloss measurement - Flexibility of coating by T-bend test - Resistance of cracking by impact deformation - Cured film durability by QUV-A accelerated weathering test - Resistance of coating to MEK - Water resistance test - Monitoring of UV curing - UV-curable UA resin in metal coating application
- RESULTS AND DISCUSSION : Synthesis of macromer - Synthesis of UA-IPA, UA-TPA, UA-PA and UA-AA - UV Curing of resins - Change in Tg during UV curing - Pendulum hardness analysis of cured film - Physical and mechanical performance of UV cured film in metal coating - Film flexibility by T-bend test - Cracking resistance of the UV cured film by impact deformation - Solvent resistance of the UV cured film - Durability of UV cured film - Performance of water resistance of the UV cured filmDOI : https://doi.org/10.1007/s11998-020-00379-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00379-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34961
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