Dépouillements

Fundamentals of stripe coating in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 31, N° 1 (01/2014)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 31, N° 1 (01/2014) . - p. 15-21 Titre : Fundamentals of stripe coating Type de document : texte imprimé Année de publication : 2014 Article en page(s) : p. 15-21 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Corrosion Détection de défauts (Ingénierie) Expertises Métaux -- Revêtements protecteurs Revêtements -- Défauts:Peinture -- Défauts Index. décimale : 667.9 Revêtements et enduits Résumé : Consider the following scenario, which points out one of the worst disappointments in the painting of steel structures. The owner carefully plans a project to include a well-written specification, careful material evaluation and selection, a qualified contractor, and thorough inspection of the work. The project is done on time, within budget, and with no claims for extra work. Two years later, visual inspection of the project reveals that 99% of the painting work shows no signs of failure. Yet, essentially every edge, boit, and weld is rusting. What happened ? The project specification did not require "striping" or "stripe coating" of all edges and welds during the painting work. Is this the problem? Maybe...maybe not. Note de contenu : - WHAT IS 'STRIPING' OR 'STRIPE COATING ?' - IS STRIPE COATING NECESSARY ? - STRIPE COATING TECHNIQUES : When should stripe coating be specified ? - Is stripe coating an additional coat of paint ? - Which generic paints warrant consideration of stripe coating ? - Which coating layers warrant stripe coating ? - Should stripe coating be applied before or after the full coat of primer ? - Is thinning required for the striping material ? - Should a thickness be specified for a stripe coat ? - What application methods should be used for stripe coating ? - EDGE RETENTIVE COATINGS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20897 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15990	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Understanding slip coefficient and tension creep testing of coatings used in slip-critical bolted connections / Bill Corbett in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 31, N° 1 (01/2014)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 31, N° 1 (01/2014) . - p. 22-41 Titre : Understanding slip coefficient and tension creep testing of coatings used in slip-critical bolted connections Type de document : texte imprimé Auteurs : Bill Corbett, Auteur ; Carly McGee, Auteur Année de publication : 2014 Article en page(s) : p. 22-41 Langues : Américain (ame) Catégories : Assemblages à boulons Calcul Coefficient de glissement Essais (technologie) Essais dynamiques Fluage Métaux -- Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Bridges, buildings, and other structures commonly include designed bolted connections of steel beams, girders, and other structural members using connection/splice plates of various sizes and configurations. High-strength bolts are used to secure the connections. The holes in the steel members and the connection/splice plates are larger (typically 1/16-1/8 of an inch larger) than the boit shafts to enable the bolts to be inserted and tensioned against the washers and nuts. The interface of the connection/splice and the structural member is called a faying surface. Faying surfaces are not required to be coated, but are often protected to prevent corrosion at the interface and rust bleed on coated surfaces adjacent to the connection. When a designer elects to coat the faying surfaces, the coating used on these surfaces must have slip-resistant properties to reduce fatigue on the connection during loading/unloading cycles (e.g., vehicles traveling across a bridge deck). Therefore, before use, the coatings specified for these faying surfaces must be tested and classified for slip coefficient properties. Once the classified coating is applied, the connection points are masked to prevent subsequent coats from inadvertently contacting these areas. There is no stipulation for specific coating types that must be used in these bolted connections, although zinc-rich primers are common and typically have slip resistance properties. Other generic coating types, including polyamide epoxy primers, have been tested and used. Other products, such as thermal spray coatings (various alloys, with and/or without a sealer) and roughened hot dip galvanized steel may be viable candidates, provided they have been tested and demonstrate slip-resistant properties. The American Institute of Steel Construction (AISC) and the Research Council on Structural Connections (RCSC) publish the Specification for Structural Joints Using High Strength Bolts. The specification comprises ten sections, which only minimally address testing of coatings used in bolted joints. However, Appendix A, "Testing Method to Determine the Slip Coefficient for Coatings Used in Bolted Joints" contains four sections relating to coating testing (General Provisions; Test Plates and Coating of the Specimens; Slip Tests; and Tension Creep Tests). The focus of this article is on the testing required in Appendix A. Note de contenu : - ESSENTIAL VARIABLES - CORRECTION OF COATING THICKNESS DEFICIENCIES - TEST PLATE DESIGN AND SURFACE PREPARATION - TEST PLATE MOUNTING, COATING APPLICATION, AND CURING PROCEDURES - COATING THICKNESS MEASUREMENT AND SELECTION OF CONTACT SURFACES - TEST ASSEMBLIES : Slip coefficient test procedure - Slip coefficient calculation - Tension creep test procedure - OTHER CONSIDERATIONS : 1. What is the effect (if any) of surface profile shape on the slip coefficient properties of coatings ? - 2. What is the effect (if any) of surface profile depth on the slip coefficient properties of coatings ? - 3. Is there a difference in slip coefficient properties when a coating is tested over a surface that has been power tool cleaned (i.e. SSPC-SP 11 or SP 15) versus abrasive blast cleaned ? - 4. Is there a curing "window" (both a minimum and a maximum set time prior to bolt-up) ? - 5. What is the effect of using a different type of thinner (acceptable for use by the coating manufacturer) on the slip coefficient properties ? - 6. What is the effect of using lesser or greater amounts of thinner ? - 7. Five replicate assemblies are tested for slip coefficient and then averaged to generate a single slip coefficient value. Is there an acceptable standard deviation between the replicate trials ? that is, what determines an "outlier" ? - 8. Mating of dissimilar coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20904 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15990	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Titans of the abyss / Mike O'Donoghue in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 31, N° 1 (01/2014)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 31, N° 1 (01/2014) Titre : Titans of the abyss : Polyurethane, polyurea, and hybrid lining technology Type de document : texte imprimé Auteurs : Mike O'Donoghue, Auteur ; Vijay Datta, Auteur Année de publication : 2014 Langues : Américain (ame) Catégories : Alliages polymères Amines Une amine est un composé organique dérivé de l'ammoniac dont certains hydrogènes ont été remplacés par un groupement carboné. Si l'un des carbones liés à l'atome d'azote fait partie d'un groupement carbonyle, la molécule appartient à la famille des amides. Découvertes en 1849, par Wurtz les amines furent initialement appelées alcaloïdes artificiels. On parle d'amine primaire, secondaire ou tertiaire selon que l'on a un, deux ou trois hydrogènes substitués. Par exemple, la triméthylamine est une amine tertiaire, de formule N(CH3)3. Typiquement, les amines sont obtenues par alkylation d'amines de rang inférieur. En alkylant l'ammoniac, on obtient des amines primaires, qui peuvent être alkylées en amines secondaires puis amines tertiaires. L'alkylation de ces dernières permet d'obtenir des sels d'ammonium quaternaire. D'autre méthodes existent : 1. Les amines primaires peuvent être obtenues par réduction d'un groupement azoture, 2. Les amines peuvent aussi être obtenues par la réduction d'un amide, à l'aide d'un hydrure, 3. L'amination réductrice permet l'obtention d'amines substituées à partir de composés carbonylés (aldéhydes ou cétones), 4. Les amines primaires peuvent être obtenues par la réaction de Gabriel. Etudes comparatives Isocyanates Matériaux hybrides Polyols Polyurée Polyuréthanes Revêtements protecteurs Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : Solvent-free polyurethanes, polyureas, and polyurethane/polyurea hybrid technologies have shown promise for immersion service in various market segments. A wide array of solvent-free technologies of this type can be formulated to have a plethora of chemical physical properties by carefully selecting the amines, polyols, or a combination thereof. This is particularly true for the polyurethanes and polyurethane hybrids. Solvent-free polyurethanes, polyureas, and polyurethane/polyurea hybrid technologies can be used in either a pure form or when slightly modified to customize required performance properties. Note de contenu : - LINING SELECTION : THE INFLUENCE OF CHEMISTRY IN POLYURETHANE, POLYUREA AND HYBRIDS - DEFINITIONS : Polyurethane - Polyurea - Hybrid - POLYURETHANES : FILM FORMATION - POLYUREAS : FILM FORMATION - HYBRID : FILM FORMATION - Table 1 : Reactions of the isocyanate group - Table 2 : General comparison of polyurethane, polyurea, and hybrid properties in the coatings and linings industry - Table 3 : Transmission pipeline coating testing - Advantages and disadvantages of polyurethane linings - Advantages and disadvantages of polyurea linings - Advantages and disadvantages of hybrid linings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20906 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15990	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15990	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Documents numériques

Journal of Protective Coatings Technology - Vol. 31, N° 1 URL