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Calcium tripolyphosphate / V. F. Vetere 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. 57-63 Titre : Calcium tripolyphosphate : An anticorrosive pigment for paint Type de document : texte imprimé Auteurs : V. F. Vetere, Auteur ; Beatriz del Amo, Auteur ; R. Romagnoli, Auteur ; C. Deyà, Auteur Année de publication : 2001 Article en page(s) : p. 57-63 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  anticorrosion  Protection  corrosion  Pigment  minéral  Calcium  Polyphosphate  Essai  vieillissement  accéléré  Corrosion  électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : The objective of this work was to evaluate the performance of calcium tripolyphosphate in anticorrosive paints. Its anticorrosive properties were studied in pigment suspensions and in solvent-borne paints with 10% and 30% of the pigment by volume and a pigment volume concentration/critical pigment volume concentration (PVC/ CPVC) equal to 0.8. The behavior of paints formulated with epoxy and alkyd resins was assessed by accelerated (salt spray cabinet and humidity chamber) and electrochemical tests (corrosion potential, ionic resistance, and polarization resistance). Calcium tripolyphosphate was proven to inhibit steel corrosion when incorporated in a paint film. Good protection was achieved employing only 10% by volume of the pigment, instead of 30%, as was suggested in the case of phosphates. The anticorrosion protection afforded by alkyd paints was impaired when the pigment content was increased. Epoxy paints seemed to be less sensitive to the pigment content. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5734 [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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NIST reference goniophotometer for specular gloss measurements / Maria E. Nadal 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. 73-80 Titre : NIST reference goniophotometer for specular gloss measurements Type de document : texte imprimé Auteurs : Maria E. Nadal, Auteur ; E. Ambler Thompson, Auteur Année de publication : 2001 Article en page(s) : p. 73-80 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  Propriété  optique  Feuil  Brillant  Réflexion  spéculaire  Appareil  mesure  Goniophotomètre Index. décimale : 667.9 Revêtements et enduits Résumé : The measurement of specular gloss consists of comparing the luminous reflectance from a test specimen to that from a gloss standard, under the same geometric conditions. The reference goniophotometer described here was designed and characterized to comply with the geometric and spectral conditions specified in the international documentary standards for specular gloss measurements at the standard geometries of 20, 60, and 85°. In addition, this instrument measures the bi-directional luminous reflectance and transmittance for incident angles from 0 to 85°. The goniophotometer and the measurement procedures used to determine the specular gloss of nonmetallic are described in this paper, as well as the characterization of the instrument and uncertainty analysis. The minimum relative expanded uncertainty (k=2) for the reference goniophotometer is 0.3%. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5736 [article]

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Stabilization of aluminum pigment in waterborne paints / Bodo Müller 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. 81-84 Titre : Stabilization of aluminum pigment in waterborne paints Type de document : texte imprimé Auteurs : Bodo Müller, Auteur ; Claude Oughourlian, Auteur ; Dimitrios Triantafillidis, Auteur Année de publication : 2001 Article en page(s) : p. 81-84 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  anticorrosion  aluminium  Pigment  métallique  Stabilisation  Inhibiteur  corrosion  Salicylique  acide  Fluorophosphate  Agent  surface  Epoxyde  résine  Formulation  eau  Milieu  basique  Contrainte  cisaillement  Etude  expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : The corrosion of aluminum pigments in aqueous alkaline paint media, which results in the evolution of hydrogen, can be inhibited by certain substances. The combination of non-inhibiting paint resins with three corrosion inhibitors (salicylic acid, a fluorinated phosphate surfactant, and an epoxy ester resin) has been studied. The presence of the resins does not significantly affect the stabilization of the aluminum pigment at pH 10 by the corrosion inhibitors. With the addition of corrosion inhibitors, the hydrogen volume evolved from aqueous aluminum pigment dispersions is surprisingly reduced by stirring. However, when heated to +40°C aqueous aluminum pigment dispersions with inhibitors evolve more hydrogen ; at pH 8 the results are still satisfactory even at +40°C. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5737 [article]

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Color and appearance : I / Zeno W. Wicks 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. 49-56 Titre : Color and appearance : I Type de document : texte imprimé Auteurs : Zeno W. Wicks, Auteur ; Frank N. Jones, Auteur ; S. Peter Pappas, Auteur Année de publication : 2001 Article en page(s) : p. 49-56 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  Propriété  optique  Feuil  Couleur  Aspect  Observation  visuelle  Source  lumineuse  Contretypage  couleur Index. décimale : 667.9 Revêtements et enduits Résumé : Color and the interrelated topic of gloss are important to the decorative aspects of the use of coatings and, sometimes, to the functional aspects of their use. We have all dealt with color since we were babies, but most people have little understanding of color. Many technical people think of it as an aspect of physics dealing with the distribution of visible light. While that is a factor, color is a psychophysical phenomenon. The difficulty of understanding color can be seen by considering the most rigorous definition of color that has been prepared: Color is that characteristic of light by which an observer may distinguish between two structure-free fields of view of the same size and shape. In effect, it says that color is what is left to distinguish between two objects when all the other variables are removed. Not a very satisfying definition. Color has three components: an observer, a light source, and an object. (The single exception is when the light source is the object being viewed.) There is no color on an uninhabited island. This is not just a semantic statement; color requires an observer. There is no color in the absence of light; in a completely darkened room there is no color, not because you cannot see it, but because it is not there. There must be an object; if you look out the window of a spaceship without looking at a planet or star, there is no color-there is an observer, there is light, but there is no object. Another major factor affecting appearance is surface roughness. If a surface is very smooth, it has a high gloss; if it is rough on a scale below the ability of the eye to resolve the roughness, it has a low gloss. If, however, the roughness can be resolved visually, a film may exhibit brush marks, orange peel, texture, and so forth. Furthermore, there can be a combination of small scale and larger scale roughness, so films can, for example, have a low gloss and brush marks or high gloss and orange peel. The eye can resolve irregularities in surface smoothness of approximately 25 mm, depending on the distance from the object. Adding to the complications, color and gloss interact, changing either changes the other. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5748 [article]

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