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Cost-effective pigmentation in alkyd primers for steel : barrier anti-corrosion mechanism / William C. Johnson in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 831 (04/1994)
[article]
Titre : Cost-effective pigmentation in alkyd primers for steel : barrier anti-corrosion mechanism Type de document : texte imprimé Auteurs : William C. Johnson, Auteur Année de publication : 1994 Article en page(s) : p. 47-54 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion
Coût -- Contrôle
Formulation (Génie chimique)
Métaux -- Revêtements protecteurs
Oxyde de plomb
Oxyde de zinc
Pigments inorganiques
Polyalkydes
Primaire (revêtement)Index. décimale : 667.9 Revêtements et enduits Résumé : A major cost of alkyd primers for the protection of steel is the chemically active pigment. A low concentration of a pigment sufficient to just neutralize the acids that are formed during the drying process produces soaps and salts and eliminates chemically active acids and alkalis. Thus, barrier properties of the binder are secured. This reduces the raw material cost and increases the protection. A review of collected literature on the chemistry of alkyd primers and on exposure studies provides an understanding of barrier protection as related to alkyd primers. Formulating practices for alkyd primers to obtain superior protection at low cost are explained. Note de contenu : - INTRODUCTION : Definitions - Background
- PART I-COMPARATIVE EXPOSURE RESULTS : Earliest alkyd barrier formulation - Zinc oxide and red lead concentration ladders - SSPC PACE program 1
- PART II-CHEMISTRY, FORMULATION, AND COSTS : Unique chemistry of alkyd and drying oil cure - Formulating principles and practices - Savings in cost with barrier formulation
- DISCUSSION : NeutralizationPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18624
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 831 (04/1994) . - p. 47-54[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003465 - Périodique Bibliothèque principale Documentaires Disponible 003478 - Périodique Bibliothèque principale Documentaires Exclu du prêt Crosslinked main-chain-type polybenzoxazine coatings for corrosion protection of mild steel / Xin Lu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 4 (07/2017)
[article]
Titre : Crosslinked main-chain-type polybenzoxazine coatings for corrosion protection of mild steel Type de document : texte imprimé Auteurs : Xin Lu, Auteur ; Liu Yan, Auteur ; Wenfei Zhang, Auteur ; Xueying Zhang, Auteur ; Changlu Zhou, Auteur ; Zhong Xin, Auteur Année de publication : 2017 Article en page(s) : p. 937-944 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.
Analyse électrochimique
Anticorrosion
Métaux -- Revêtements protecteurs
PolybenzoxazineIndex. décimale : 667.9 Revêtements et enduits Résumé : Bisphenol A/diaminodiphenylmethane (BA-ddm)-based polybenzoxazine precursor was synthesized from 4,4′-diaminodiphenylmethane, bisphenol A, and paraformaldehyde. The curing behavior of BA-ddm was studied by using differential scanning calorimeter and Fourier transform infrared spectrometer techniques. To verify the anticorrosion property, cured polybenzoxazine (PBA-ddm) coatings were prepared on mild steel (MS) through dip-coating and thermal curing methods. The surface properties of cured PBA-ddm coatings were characterized by microscopy and contact angle measurement. The electrochemical measurements were carried out to investigate the corrosion properties of PBA-ddm-coated MS. The results showed that PBA-ddm-coated MS samples exhibited high anticorrosive performance with the corrosion current reduced by two orders of magnitude than that of pristine MS. Note de contenu : - EXPERIMENTAL SECTION : Materials - Synthssis of BA-ddm - Preparation of PBA-ddm coating - Chemical structure characterisation - Curing behavior of BA-ddn - Surface properties - Electrochemical measurement
- RESULTS AND DISCUSSION : Curing behavior of BA-ddn precursor - Surface properties of PBA-ddm coating - Corrosion protection property - Corrosion protection mechanismDOI : 10.1007/s11998-016-9902-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9902-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28935
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Code-barres Cote Support Localisation Section Disponibilité 19194 - Périodique Bibliothèque principale Documentaires Disponible Crosslinking waterborne coatings with bipodal silanes for improved corrosion protection performance / Jacob D. Shevrin in COATINGS TECH, Vol. 16, N° 4 (04/2019)
[article]
Titre : Crosslinking waterborne coatings with bipodal silanes for improved corrosion protection performance Type de document : texte imprimé Auteurs : Jacob D. Shevrin, Auteur ; Sheba D. Bergman, Auteur Année de publication : 2019 Article en page(s) : p. 38-47 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.
Angle de contact
Anticorrosifs
Anticorrosion
Essais de brouillard salin
Métaux -- Revêtements protecteurs
Organosilanes
Résistance chimique
Réticulation (polymérisation)
Revêtements (produits chimiques)
Revêtements en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : As global environmental concerns continue to overshadow the use of well-established metal surface pretreatment processes such as chromate treatment and phosphatization, the need for environmentally friendly corrosion protection systems has never been greater. A promising solution to this worldwide regulatory issue is waterborne silane technology, which can offer a heavy metal-free, volatile organic compound (VOC)-free alternative to protecting metals from corrosion. The mechanism behind this corrosion protection can best be explained by the passivation of a metal surface with a waterborne silane film, which acts as a barrier to water, salts, and other corroding materials in the surrounding environment. It is important to note that the waterborne silane technology investigated in this work can be viewed as a type of conversion coating or pretreatment to the metal surface, rather than a conventional waterborne coating or primer. Certain waterborne silane technology requires high-temperature curing procedures for optimal results, which can be difficult to achieve in certain applications or industries. With the use of bipodal silanes, the additional crosslinking introduced into the system can alleviate the need for this high-temperature curing procedure. In this novel work, we demonstrate that the incorporation of a bipodal silane into waterborne silane systems improves the surface passivation of the metal surface, enhances the hydrophobicity of the system, and increases the crosslinking density of the system, leading to significant improvements in the corrosion resistance of waterborne silane technology. Note de contenu : - EXPERIMENTAL METHODS : Materials - Formulation preparation - Cleaning and application procedures - Testing procedures
- RESULTS AND DISCUSSION : Surface contact angle analysis - Alkaline resistance testing
- Fig. 1 : Surface passivation of a metal substrate with an organofunctional silane film after application and curing
- Fig. 2 : Structure of 1,2-bis(triethoxysilyl)ethane, the organofunctional bipodal silane investigated in this work
- Fig. 3 : DI water droplets on uncoated aluminum and WB1-coated aluminum
- Fig. 4 : Contact angle measurements of DI water on uncoated aluminum (44°± 1.5°) and WB1-coated aluminum (72°±1.6°)
- Fig. 5 : Contact angle measurements of DI water on WB2-coated aluminum (41°± 1.6°) and WB3-coated aluminum (50°± 2.0')
- Fig. 6 : Contact angle measurements of Dl water on WB4-coated aluminum (40°± 1.7°) and WB5-coated aluminum (56°± 1.4°)
- Fig. 7 : WB2-coated aluminum after 250 h in a neutral salt spray test. Coatings cured for 72 h at 23°C, 30 min at 80°C and 30 min at 180°C
- Fig. 8 : WB3-coated aluminum after 250 h in a neutral salt spray test. Coatings cured for 72 h at 23°C, 30 min at 80°C and 30 min at 180°C
- Fig. 9 : WB4-coated aluminum after 400 h in a neutral salt spray test. Coatings cured for 72 h at 23°C), 30 min at 80°C and 30 min at 180°C
- Fig. 10 : WB5-coated aluminum after 400 h in a neutral salt spray test. Coatings cured for 72 h at 23°C, 30 min at 80°C and 30 min at 180°C
- Fig. 11 : WB2-coated aluminum and WB3-coated aluminum after 6 min of immersion in a 10% NaOH solution
- Fig. 12 : WB2-coated aluminum before and after the alkaline resistance test
- Fig. 13 : WB3-coated aluminum before and after the alkaline resistance test
- Fig. 14 : WB2-coated aluminum and WB3-coated aluminum after an alkaline resistance test and 100 h in neutral sait spray testing
- Fig. 15 : Bode plot detailing the absolute impedance Z of several coated and uncoated aluminum substrates over a large range of frequenciesEn ligne : https://drive.google.com/file/d/1vGwBqE-ZGnNd0mYbn5M_Y05XGQVZFuCY/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32319
in COATINGS TECH > Vol. 16, N° 4 (04/2019) . - p. 38-47[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20867 - Périodique Bibliothèque principale Documentaires Disponible Crosslinking waterborne coatings with bipodal silanes for improved corrosion protection performance / Jacob D. Shevrin in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4654 (09/2019)
[article]
Titre : Crosslinking waterborne coatings with bipodal silanes for improved corrosion protection performance Type de document : texte imprimé Auteurs : Jacob D. Shevrin, Auteur ; Sheba D. Bergman, Auteur Année de publication : 2019 Article en page(s) : p. 31-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs
Anticorrosion
Essais accélérés (technologie)
Formulation (Génie chimique)
Métaux -- Revêtements protecteurs
Réticulation (polymérisation)
Revêtements en phase aqueuse -- Additifs
Silanes organofonctionnelsIndex. décimale : 667.9 Revêtements et enduits Résumé : The authors discusses waterborne silane technology and its impact on corrosion resistance properties in a coating.
As waterborne silane technology continues to gain interest as an environmentally friendly alternative to well-established corrosion protection technology, investigations into performance-enhancing additives are crucial for supporting this market growth.
If can be concluded that organofunctional bipodal silanes are viable performance-enhancing additives in waterborne corrosion protection systems due to the increase in hydrophobicity, crosslinking density and surface passivation that these materials can provide. ln particular, the waterborne organofunctional silanol system with colloidal silica and organofunctional bipodal silane additives exhibited the best corrosion resistance in neutral salt spray testing, the best alkaline resistance in alkaline testing, and the highest impedance during EIS testing. However, it is important to note that adding in an organofunctional bipodal silane into a room temperature cured waterborne organofunctional silanol coating did not outperform a thermally cured waterborne organofunctional silanol coating without organofunctional bipodal silane additives.
The authors discusses waterborne silane technology and its impact on corrosion resistance properties in a coating.
While contact angle measurements, salt spray testing, alkaline resistance testing and EIS data support this claim of increased corrosion resistance with the use of organofunctional bipodal silane additives, further research is necessary to understand the complete scope of waterborne silane technology and its interactions with organofunctional bipodal silanes.
Additional experimentation, including outdoor weatherability testing in real life conditions, is underway to better understand this technology in the hope of further improving the performance, affordability and reliability of waterborne silane coatings for corrosion resistance applications.Note de contenu : - EXPERIMENTAL METHODS : Materials - Formulation preparation - Cleaning and application procedures - Testing procedures
- RESULTS AND DISCUSSION : Surface contact angle analysis - Neutral salt spray testing - Alkaline resistance testing - Electrochemical impedance spectroscopy.
- Table : Ingredients for waterborne coatings WB1-WB5 (weight in grams)En ligne : https://drive.google.com/file/d/1T8G1vYU9OkeErtzSNwIsLN49qBs9CldH/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32919
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4654 (09/2019) . - p. 31-36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21175 - Périodique Bibliothèque principale Documentaires Disponible Curable hybrid materials for corrosion protection of steel : development and application of UV-cured 3-methacryloxypropyltrimethoxysilane-derived coatings / Kevin M. Scotland in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 4 (07/2020)
[article]
Titre : Curable hybrid materials for corrosion protection of steel : development and application of UV-cured 3-methacryloxypropyltrimethoxysilane-derived coatings Type de document : texte imprimé Auteurs : Kevin M. Scotland, Auteur ; Shegufa Shetranjiwalla, Auteur ; Andrew J. Vreugdenhil, Auteur Année de publication : 2020 Article en page(s) : p. 977-989 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier au carbone
Anticorrosifs
Anticorrosion
Caractérisation
Condensation
Dip-coating
Essais (technologie)
Formulation (Génie chimique)
Hydrolyse
Métaux -- Revêtements protecteurs
Méthacryloxypropyltriméthoxysilane
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements organiques
Sol-gel, ProcédéIndex. décimale : 667.9 Revêtements et enduits Résumé : A UV-crosslinkable two-component organically modified silicate (ORMOSIL) sol–gel coating was made using 3-methacryloxypropyltrimethoxysilane (MaPTMS) and tetraethoxysilane (TEOS) in two stages. In the first stage, key synthetic parameters, such as use of co-solvents, reaction temperature, reaction time, and catalyst, were optimized for the rapid hydrolysis and condensation of the ORMOSIL. The ORMOSIL material was made using isopropanol as the solvent and HNO3 as the acid catalyst. This resulted in a sol–gel that underwent rapid hydrolysis in 35 s. The ORMOSIL demonstrated extensive condensation after 10 min of stirring at room temperature followed by 10 min of heating at 60°C as monitored by 29Si-NMR. In the second stage, the ORMOSIL was successfully crosslinked with up to 70% consumption of the acryl functionality within 5 min under UV light exposure in the presence of photoinitiator. The UV-crosslinked coating exhibited high adhesion to low-carbon steel and impeded substrate corrosion from 17 to 25 h under an accelerated corrosive environment. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of sol-gel formulation MaT - Variation of solvent and acid catalysts - Dip coating and crosslinking - Characterization - Corrosion performance testing
- RESULTS AND DISCUSSION : Sol-gel formulation - Hydrolysis and condensation - UV crosslinking - Corrosion inhibition resultsDOI : https://doi.org/10.1007/s11998-019-00317-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00317-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34385
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