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Considerations for relative humidity and temperature control in atmospheric corrosion test standards / Sean Fowler in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 204, N° 4600 (09/2014)
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Titre : Considerations for relative humidity and temperature control in atmospheric corrosion test standards Type de document : texte imprimé Auteurs : Sean Fowler, Auteur Année de publication : 2014 Article en page(s) : p. 22-25 Langues : Anglais (eng) Catégories : Air -- Humidité
Corrosion
Essais accélérés (technologie)
Température -- ContrôleIndex. décimale : 667.9 Revêtements et enduits Résumé : In the May issue of PPCJ a short history of modern atmospheric corrosion testing and recent advances in the field was discussed. In this article we will cover a topic, which generates many questions from laboratory technicians and researchers who operate corrosion test chambers : how relative humidity and temperature are measured and controlled in these devices. The loose, and sometimes poor, descriptions of relative humidity measurement and control in corrosion test standards have led to significant confusion in the testing community. Device manufacturers have implemented various measurements techniques, each representing a reasonable interpretation of the standards but which may or may nor yield similar results to one another. Adding to the confusion, the very need for control of relative humidity is not as clear as one might expect of a modern test standard. Finally, what is the role of laboratory conditions in meeting the requirements of the standards ? Note de contenu : - The difficulty in defining temperature and relative humidity in standards
- Relative humidity conditions in corrosion standards : what is required ?
- Test standards : the path aheadEn ligne : https://drive.google.com/file/d/1Ka1thfqdNL52y55MAt2eaPRm8CJhUJ7l/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22201
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Code-barres Cote Support Localisation Section Disponibilité 16527 - Périodique Bibliothèque principale Documentaires Disponible Correlation of accelerated exposure testing and exterior exposure sites / Jeff Andrews in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 837 (10/1994)
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Titre : Correlation of accelerated exposure testing and exterior exposure sites Type de document : texte imprimé Auteurs : Jeff Andrews, Auteur ; Freidun Anwari, Auteur ; Ben J. Carlozzo, Auteur ; Mark DiLorenzo, Auteur ; Roy Glover, Auteur ; Steven Grossman, Auteur ; Carl J. Knauss, Auteur ; Joseph McCarthy, Auteur ; Brian Mysza, Auteur ; Rene Patterson, Auteur ; Russell Raymond, Auteur ; Brian Skerry, Auteur ; Phillip M. Slifko, Auteur ; Walter Stipkovich, Auteur ; John C. Weaver, Auteur ; Michael Wolfe, Auteur Année de publication : 1994 Article en page(s) : p. 49-67 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais accélérés (technologie)
Essais de brouillard salin
Revêtements -- Effets du climatIndex. décimale : 667.9 Revêtements et enduits Résumé : The Cleveland Society Technical Committee has undertaken a long-term study which will provide some guidance and basic information for researchers working in the areas of accelerated testing and exterior exposure analysis. The ultimate goal will be the correlation of accelerated test methods to several geographically different exposure sites. The Technical Committee began the study by choosing nine different coatings systems which offer a wide variety of performance characteristics. These systems included a high-solids epoxy, a high-solids urethane, several types of waterborne systems (waterborne epoxy, epoxy ester, acrylic, direct-to-metal (DTM) acrylic, water reducible alkyd, and styrenated acrylic), and a Type TT-E-266 specification alkyd. All systems were commercially available and, except for the specification alkyd, are considered "compliant coatings".
These sytems were placed on exterior exposure at nine different sites across the United States. Four are commonly referred to as heavy marine exposure sites and include Ocean City, NJ; Kure Beach, NC; Daytona Beach, FL; and San Francisco, CA (the Golden Gate Bridge). Three more can be considered moderate to heavy industrial exposure sites and include Cleveland, OH; North Kansas City, MO; and Miami, FL. Another site, the Los Angeles Basin area, is known for heavy smog, and the last site, Portland, OR, was chosen for high humidity and rainfall. The first six month's exposure results and early correlations within these sites will be discussed, but longer exposure times will be required before many conclusions can be drawn.
These same nine systems were also tested by use of six accelerated methods according to the protocol established by an ASTM Committee (D01.27.31) on accelerated corrosion testing. The methods include salt fog, cyclic salt fog, Prohesion Cabinet, Cyclic Prohesion/QUV, and cyclic immersion/weathering (KTA-Envirotest). These methods are either in use today or have been proposed as more realistic replacements to those in current use. Results of these accelerated tests will be discussed and an attempt made to correlate the results among these accelerated methods. In addition, positron annihilation lifetime spectroscopy (PALS) will be run at the end of the exposure period on the Daytona Beach panels.
Future work will focus on direct correlation of the long-term exposure results to the different accelerated methods.Note de contenu : - EXPERIMENTAL : Test paints
- PROCEDURE : Panel preparation - Exterior exposures - Accelerated testing - Accelerated tests - The UV light source
- RESULTS : Statistics - Exterior exposure weathering - Accelerated weathering
- DISCUSSION : Exterior exposures - Accelerated testingPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18721
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Code-barres Cote Support Localisation Section Disponibilité 003471 - Périodique Bibliothèque principale Documentaires Disponible 003484 - Périodique Bibliothèque principale Documentaires Exclu du prêt Corrosion domesticated and in the wild / Carl Reed in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 2 (02/2017)
[article]
Titre : Corrosion domesticated and in the wild Type de document : texte imprimé Auteurs : Carl Reed, Auteur ; Kat Coronado, Auteur Année de publication : 2017 Article en page(s) : p. 46-53 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.
Corrosion
Essais accélérés (technologie)
Etudes comparatives
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements organiquesIndex. décimale : 620.11 Matériaux (propriétés, résistance) Résumé : This article examines the four predominant sources of corrosion that occur “in the wild” and compares them to observational results found in exposure to accelerated corrosion conditions. By combining these observational attributes to mechanistic attributes previously examined, the use of accelerated corrosion testing can be better used as an indicator of how a coating will perform in various environmental conditions. Note de contenu : - MECHANISMS OF CORROSION ON STEEL COATED WITH ORGANIC COATINGS : Anodic : Fe -> Fe++ + 2e (oxidation), Cathodic : 2H2O+O + 4e -> 4OH (reduction) - Fe + 2H+ -> Fe++ + H2
- CORROSION CAUSATION AND EFFECTS : Erosion-induced corrosion - Damage-induced corrosion - Conductive-pathway-induced corrosion - Contamination-induced corrosion
- FIGURES : 1. Mechanism of corrosion in a neutral or alkaline environment. All figures courtesy of the author unless otherwise specified - 2. Mechanism of corrosion in an acidic environment - 3. Mechanism of erosion-induced corrosion - 4a. In the wild — erosion-induced corrosion of an epoxy coating on a steel tank - 4b. In the wild — erosion-induced corrosion showing a banding effect of varying dry-film thicknesses of a protective coating - 5a. Domesticated — erosion-induced corrosion in a neutral environment - 5b. Domesticated — erosion-induced corrosion in an acidic environment - 6. Damage-induced corrosion - 7a. Domesticated — damage-induced corrosion in a neutral environment - 7b. Domesticated — damage-induced corrosion in an acidic environment - 8a. In the wild — damage-induced corrosion in a neutral environment - 8b. In the wild — damage-induced corrosion in an acidic environment - 9. Mechanism of corrosion on coated steel from conductive pathways - 10a. An example of domesticated conductive-pathway-induced corrosion - 10b. In the wild — an example of conductive-pathway-induced corrosion - 11. Mechanism of conductive-pathway formation on edges - 12a. Domesticated — corrosion on edges - 12b. In the wild — corrosion on edges - 13. Mechanism of contamination-induced corrosion - 14a. Domesticated — contamination-induced corrosion - 14b. In the wild — contamination-induced corrosionEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6012 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28373
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Code-barres Cote Support Localisation Section Disponibilité 18746 - Périodique Bibliothèque principale Documentaires Disponible Corrosion inhibition of aluminum by organic coatings formulated with calcium exchange silica pigment / J. M. Vega in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 2 (03/2013)
[article]
Titre : Corrosion inhibition of aluminum by organic coatings formulated with calcium exchange silica pigment Type de document : texte imprimé Auteurs : J. M. Vega, Auteur ; N. Granizo, Auteur ; J. Simancas, Auteur ; D. de La Fuente, Auteur ; I. Diaz, Auteur ; M. Morcillo, Auteur Année de publication : 2013 Article en page(s) : p. 209-217 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.
Anticorrosifs
Anticorrosion
Calcium
Essais accélérés (technologie)
Métaux -- Revêtements protecteurs
Pigments inorganiques
Polyalkydes
Revêtements organiques
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : One of the first commercial ion-exchange anticorrosive pigments to be developed was Shieldex® (Si/Ca). Its proposed corrosion protection mechanism, based on the retention of aggressive cations and the subsequent release of calcium cations, has created certain controversy. A number of studies have focused on the anticorrosive behavior of this pigment on carbon steel and galvanized steel to replace chromates (Cr6+) as inhibitor pigment, but none has considered its performance on aluminum or aluminum alloys. In this research, alkyd coatings have been formulated with Si/Ca pigment at different concentrations and applied on aluminum 1050 (Al 99.5%) specimens. These specimens have then been subjected to accelerated tests (condensing humidity, salt spray, and Kesternich) and natural weathering in atmospheres of different aggressivity. Corrosion performance has been also evaluated in the laboratory by electrochemical impedance spectroscopy. The study has also considered an organic coating with zinc chromate anticorrosive pigment for comparative purposes. The results obtained with organic coatings formulated with Si/Ca pigments confirm that they provide corrosion protection of the underlying aluminum substrate, even improving the behavior of the reference zinc chromate in some environmental conditions. Note de contenu : - EXPERIMENTAL : Corrosion tests - Electrochemical impedance spectroscopy (EIS)
- RESULTS AND DISCUSSION : Natural weathering - Accelerated corrosion tests - Uncertainties about the anticorrosive mechanism of Si/Ca primers
DOI : 10.1007/s11998-012-9440-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9440-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18239
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Code-barres Cote Support Localisation Section Disponibilité 14920 - Périodique Bibliothèque principale Documentaires Disponible 15125 - Périodique Bibliothèque principale Documentaires Disponible 15592 - Périodique Bibliothèque principale Documentaires Disponible Corrosion protection by organic coatings containing polyaniline salts prepared by oxidative polymerization / M. Kohl in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 6 (11/2017)
[article]
Titre : Corrosion protection by organic coatings containing polyaniline salts prepared by oxidative polymerization Type de document : texte imprimé Auteurs : M. Kohl, Auteur ; A. Kalendova, Auteur ; E. Černošková, Auteur ; M. Bláha, Auteur ; J. Stejskal, Auteur ; M. Erben, Auteur Année de publication : 2017 Article en page(s) : p. 1397-1410 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Corrosion
Electrochimie
Essais accélérés (technologie)
Liants
Polyalkydes
Polyaniline
Polymérisation par oxydation
Revêtements -- Analyse:Peinture -- Analyse
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniques
Revêtements organiques
Revêtements protecteursIndex. décimale : 667.9 Revêtements et enduits Résumé : The aim of this work was to describe polyaniline salts synthesized and to assess the mechanical and anticorrosion properties of alkyd resin-based coating materials pigmented with them, in dependence on the pigment volume concentration and type. Polyaniline salts were prepared by oxidative polymerization in the solutions of inorganic (hydrochloric, phosphoric, and sulfuric) and organic (p-toluenesulfonic and 5-sulfosalicylic) acids. Polyaniline salts were characterized by thermal analysis and spectroscopic methods. Electrical conductivity was also measured by the van der Pauw method, and the molecular weight of the polyaniline was determined by gel permeation chromatography. Furthermore, the particle size of the solid salts was measured, and the morphology was studied by scanning electron microscopy. Subsequently, the parameters required to formulate pigmented organic coatings, i.e., density and critical pigment volume concentration were determined. A soybean oil-based fast drying alkyd resin of medium oil length was used as the binder for the organic coating material. Organic coatings containing the polyaniline salts at pigment volume concentrations 0%, 1%, 5%, 10%, and 15% were formulated and subjected to a standard accelerated cyclic corrosion tests. The organic coatings (paint films) were also subjected to mechanical tests and to the electrochemical test by potentiodynamic polarization studies. Note de contenu : - EXPERIMENTAL METHODS : Synthesis - Characterization - Formulation and preparation of the organic coatings - Mechanical properties of the paints - Corrosion studies
- RESULTS AND DISCUSSION : Thermogravimetric analysis - Differential scanning calorimetry (DSC) - X-ray diffraction analysis - Infrared spectroscopy - Molecular weight - Conductivity - Particle size - Particle morphology - pH and electrical conductivity of aqueous extracts of the polyaniline salts and paint films - Density, oil absorption, and critical pigment volume concentration (CPVC) - Mechanical properties of the coating systems - Accelerated cyclic corrosion tests - Mechanism of corrosion protection by polyaniline coatingsDOI : 10.1007/s11998-017-9942-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9942-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29643
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