Cerium acetate-modified aminopropylsilane triol : A precursor of corrosion-preventing coating for aluminum-finned condensers / T. Sugama in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 8 (10/2005)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 8 (10/2005) . - p. 649-659 Titre : Cerium acetate-modified aminopropylsilane triol : A precursor of corrosion-preventing coating for aluminum-finned condensers Type de document : texte imprimé Auteurs : T. Sugama, Auteur Année de publication : 2005 Article en page(s) : p. 649-659 Note générale : Bibliogr. Langues : Américain (ame) Tags : Propriété  thermique  Etude  expérimentale  Corrosion  sel  Protection  corrosion  Stabilité  Effet  concentration  Polycondensation  solution  Préparation  Acier  Aluminium  Couche  protectrice  anticorrosion  Cérium  Acétate  Inhibiteur  Amine  polymère  Siloxane  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : A poly-acetamide-acetoxyl methyl-propylsiloxane (PAAMPS) polymer containing a cerium (Ce) oxide derivative was synthesized through three spontaneous reactions: condensation, amidation, and acetoxylation. The PAAMPS synthesizing took place between the Ce acetate dopant and aminopropylsilane triol (APST) as the film-forming precursor aqueous solution at 150°C. PAAMPS was evaluated for use as a corrosion-preventing coating for air-cooled condensers consisting of two metal components : aluminum fins and carbon steel tube. The key factors to ensuring the maximum performance of the PAAMPS/Ce oxide coating system in mitigating the corrosion of both aluminum and steel included (1) minimizing the content of non-reacted water-soluble APST and Ce acetate remaining in the coating, (2) lowering the susceptibility of the coating's surface to moisture, (3) precipitating a passive Ce3+ oxide (Ce2O3( film insensitive to Cl dissolution over the metal's surfaces, and (4) possessing excellent adhesion to the metal's surfaces. The combination of these factors considerably decreased the rate of the cathodic oxygen reduction reaction at the corrosion site of the metals. In fact, the corrosion rate, measured in milli-inches per year (mpy), of bare steel was reduced more than one order of magnitude by applying this coating. Correspondingly, the coating extended the useful lifetime of steel exposed in a salt-fog chamber at 35°C from only ~10 hr to ~768 hr. Furthermore, tins coating system far better protected an aluminum substrate from the corrosion than it did one of steel. Even a very thin nanoscale coating film deposited on the aluminum's surfaces reduced the corrosion rate, (mpy), by nearly two orders of magnitude over that of the bare aluminum. Also, the salt-spray resistance of aluminum panels covered by this nanoscale film was strikingly extended to more than 1440 hr, compared with -40 hr for bare aluminum. DOI : 10.1007/BF02774594 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02774594.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3790 [article]

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Hydrothermal degradation study of phenolic polymer coatings by advanced analytical methods / T. Sugama in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 917 (06/2001)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 917 (06/2001) . - p. 65-71 Titre : Hydrothermal degradation study of phenolic polymer coatings by advanced analytical methods Type de document : texte imprimé Auteurs : T. Sugama, Auteur ; S. S. Kelley, Auteur ; K. Gawlik, Auteur Année de publication : 2001 Article en page(s) : p. 65-71 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  anticorrosion  Dégradation  chimique  Feuil  Condition  hydrothermale  Phénoplaste  Oxydation  Acier  Réaction  interface  Etude  expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : Resole-type phenolic polymer coatings were deposited on carbon steel panels, and then were exposed for 15 days to a simulated geothermal brine with pH 1.6 at 150°, 175°, and 200°C. The phenolic polymers were hydrothermally oxidized. To comprehensively understand the mechanisms of this oxidative degradation of the coatings, the modern analytical techniques of XPS, contact angle, TGA, SEM-EDX, and EIS were used in combination. The oxidative degradation of polymer took place in the three-step oxidation routes: first, the bridging methylen linkages in the network polymer structure were replaced by the benzylhydrol-type linkages ; second,the benzylhydrol-type linkages were transformed into the benzophenone-type linkages ; and finally, the C-C-C linkage in the benzophenone derivative ruptured to form salicylic acid derivative as the ultimate degradation products. Hydrothermal temperatures of >175°C promoted the degree of such oxidation degradation, causing the coating surface to become susceptible to moisture, to absorb more brine, and also to allow corrosive electrolytes to permeate easily. Consequently, iron oxides as the corrosion products from the underlying steel were yielded at a critical interfacial zone between the coat. The excessive growth of iron oxides led to the generation of internal stress-induced cracks in the coating film, thereby resulting in the failure of these corrosion-preventing barriers. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5735 [article]

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Interfaces of polyphenyletheretherketone (PEEK) and polyphenylene sulfide (PPS) coated zinc phosphated steels after heating-cooling cycles in a wet, harsh environment / T. Sugama in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 838 (11/1994)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 838 (11/1994) . - p. 43-54 Titre : Interfaces of polyphenyletheretherketone (PEEK) and polyphenylene sulfide (PPS) coated zinc phosphated steels after heating-cooling cycles in a wet, harsh environment Type de document : texte imprimé Auteurs : T. Sugama, Auteur ; N. Carciello, Auteur Année de publication : 1994 Article en page(s) : p. 43-54 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. Adhésion Anticorrosion Atmosphère humide Chimie des surfaces Contraintes thermiques Délaminage Essais accélérés (technologie) Métaux -- Revêtements protecteurs Phosphate de zinc Polyéther éther cétone Polysulfures de phénylène Index. décimale : 667.9 Revêtements et enduits Résumé : To evaluate the ability of polyphenyletheretherketone (PEEK) and polyphenylene sulfide (PPS) thermoplastic coatings that protect zinc phosphate (Zn.Ph)-treated steels from corrosion in a wet, harsh environment (1.0 wt% H2SO4, 3.0 wt% NaCl, and 96.0% wt% water at temperatures from 25° to 200°C), we exposed them in autoclave to attempt heating-cooling cyclic fatigue tests (1 cycle - 12 hr at 200°C + 12 hr at 25°C) up to 90 times. Although no changes in appearance were seen in the PEEK specimens after 60 cycles, extending the cycles to 90 caused the delamination of the coating film from the Zn.Ph. The major reason for this delamination was the degradation of the PEEK polymer caused by its hydrothermal-catalyzed esterification. In the PPS-coating systems, chemical reactions at the interfaces between the PPS and Zn and Fe in the Zn.Ph layer during cycling led to the formation of ZnS and FeS reaction products, which enhanced the Zn.Ph-to-PPS adhesive bond; correspondingly, there were no signs of peeling and separation of the coating after 90 cycles. In addition, because these intermediate reaction products are insoluble at high pH, they minimized the rate of delamination of the PPS coating caused by the cathodic reaction, H2O + 1/2 O2 + 2e- ' 2OH-, at the corrosion side of a defect in the film. In contrast, PEEK coatings containing non-reactive Zn.Ph underwent cathodic delamination, because of the susceptibility of Zn.Ph to alkali dissolution. Thus, we believe that combined layers of PPS and Zn.Ph provide great protection to steels in a harsh environment with temperatures up to 200°C. Note de contenu : - EXPERIMENTAL METHODS : Materials - Measurements - RESULTS AND DISCUSSION : PEEK coating systems - PPS coating system - Cathodic delamination Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18727 [article]

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Polyacrylamide-grafted dextrine copolymer coatings / T. Sugama in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 887 (12/1998)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 70, N° 887 (12/1998) . - p. 69-78 Titre : Polyacrylamide-grafted dextrine copolymer coatings Type de document : texte imprimé Auteurs : T. Sugama, Auteur ; T. Hanwood, Auteur Année de publication : 1998 Article en page(s) : p. 69-78 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Copolymères greffés Liants Polyacrylamide Le polyacrylamide est un polymère (-CH2-CH(-CONH2)-) formé à partir d'acrylamide. Il peut être réticulé en incorporant dans le mélange de polymérisation un dérivé bi-fonctionnel de l'acrylamide : le N,N'-méthylène-bis-acrylamide (CH2=CH-CO-NH-)2CH2. Le polyacrylamide, contrairement à l'acrylamide qui est neurotoxique, n'est pas toxique mais il doit être manipulé avec précaution car il peut contenir des résidus d'acrylamide. c'est un gel hautement absorbant. Sous forme de poudre, il se dilue dans l'eau pour former un gel visqueux après agitation vigoureuse. Des substances ioniques telles le sel permettent au polyacrylamide de libérer les substances absorbées. L'intérêt de ce polymère peut être apprécié dans son caractère de fluide non newtonien, et constitue un bon exemple d'application de l'effet Weissenberg: le fluide, soumis à l'action d'un agitateur magnétique remonte au centre du récipient au lieu de se plaquer sur les côtés, comme l'aurait fait un fluide newtonien classique, comme l'eau. Polycyclodextrines Primaire (revêtement) Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Polyacrylamide (PAM)-grafted dextrine (DEX) copolymers were prepared by heating a film-forming precursor solution consisting of PAM, corn starch-derived DEX, cerium (IV) nitrate hexahydrate, and water, at 150° or 200°C; these solutions were applied as water-based primer coating systems to aluminum (Al) substrates. Grafting PAM on the DEX not only inhibited the fragmentation of DEX structures caused by oxidation at 200°C in air, but also aided in fabricating coating films that were less susceptible to moisture and minimized the rate of permeation of electrolyte species through the film layers. In addition, the grafted DEX coating films favorably reacted with the Al substrate to form Al-O bonds at interfaces. Consequently, Al panels coated with a highly grafted DEX copolymer had a salt-spray resistance of 600 hr. Note de contenu : - EXPERIMENTAL METHODS : Materials - Coating technology - measurements - RESULTS AND DISCUSSION : PAM-modified DEX copolymers - Characteristics of the coatings - Corrosion Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18057 [article]

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