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Preventing coating problems and failures on bolted bridge connections / James D. Machen in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 12 (12/2016)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 33, N° 12 (12/2016) . - p. 12-19 Titre : Preventing coating problems and failures on bolted bridge connections Type de document : texte imprimé Auteurs : James D. Machen, Auteur Année de publication : 2017 Article en page(s) : p. 12-19 Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Assemblages à boulons Métaux -- Revêtements:Métaux -- Peinture Ponts -- entretien et réparations Ponts métalliques -- Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Rather than describe a failure that has already occurred, this article addresses key steps to follow when painting bolted connections in order to prevent failures from occurring by focusing on surface preparation and painting practices that have been used successfully on bolted bridge connections such as splice plates and gusset connections for new construction projects or new steel additions to existing bridges. Larger connection surfaces are typically shop blast-cleaned and shop primed only with an inorganic or organic zinc-rich primer and then bolted together in the field using hot-dipped-galvanized (HDG) or mechanically galvanized bolt assemblies consisting of a nut, bolt and washer. Smaller shop-primed connections are sometimes bolted in the shop prior to shipping. Field finish painting of bolted connections is typically accomplished using an epoxy intermediate coat followed by a urethane finish coat. However, some bridge owners specify the application of an organic zinc-rich primer on mechanically galvanized bolt assemblies prior to the epoxy intermediate and urethane finish. Because galvanized bolt assemblies (as opposed to plain black bolts) are typically used in conjunction with steel connections primed with zinc-rich primer in the shop, that is our focus here. While the paintable surface area of bolted bridge connections is small compared to the whole structure, on larger structures, individual connections can contain dozens or even hundreds of closely spaced bolt assemblies. Because the bolt assemblies have a more complex configuration and are spaced so closely, cleaning and painting these surfaces presents challenges that require more time, effort and expense to properly complete, versus other bridge surfaces. Proper painting of bridge connections is critical because these are the surfaces where premature coating problems often begin. Standard practices used by various bridge owners and recommended by paint manufacturers are addressed in this article. Note de contenu : - Surface preparation of galvanized bolt assemblies - Preparing rust and damaged galvinizing on bolt assemblies - Removal of nut lubricants from bolt assemblies - Additional nut lubricant options - Paint application on bolt assemblies - FIGURES : 1. The two bottom rows of bolts show damage to the galvanizing caused by tightening with too large of a socket - 2. This photo shows nut lubricant on hot-dipped-galvanized bolt assemblies (green, left) and mechanically galvanized bolt assemblies (blue, right) - 3. This photo depicts both the pre-cleaning and post-cleaning conditions of bolt assemblies. For this test, solvent cleaning with MEK was most effective for removing the blue-colored nut lubricant En ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=5971 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28378 [article]

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Offshore wind farms : Successful corrosion protection and effective quality management / Peter Kronborg in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 12 (12/2016)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 33, N° 12 (12/2016) . - p. 26-33 Titre : Offshore wind farms : Successful corrosion protection and effective quality management Type de document : texte imprimé Auteurs : Peter Kronborg, Auteur Année de publication : 2017 Article en page(s) : p. 26-33 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. Anticorrosifs Anticorrosion Eoliennes -- Revêtements protecteurs Epoxydes Marines (peinture) Métaux -- Revêtements protecteurs Polyuréthanes Revêtements -- Détérioration:Peinture -- Détérioration Index. décimale : 667.9 Revêtements et enduits Résumé : Following an uncertain start, the present offshore coatings systems for wind farms have shown fine durability against the aggressive marine environment. In this article, positive features from the first wind farms with more than 15 years of service are described, as is the importance of quality management. Note de contenu : - THE FIRST EXPERIENCE - LATER AND PRESENT PAINT SYSTEMS : Jackets for substations and external TPs - The interiors of TPs and interiors and exteriors of MPs - The railings - The appurtenances - QUALITY CONTROL OF STEEL AND SURFACE TREATMENT ON WIND FAMRS - DEFECTS : Paint errors - Insufficient pre-treatment of welds and edges - Mounting of new accessories - Flaking - Grinding sparks - Cracking - DRY FILM THICKNESS MEASUREMENTS - CONTROL OF PAINTING OPERATIONS FIGURES : 1. Offshore wind turbine construction showing the tower, transition piece (TP), transition piece cavity and the monopile (MP) which is the underwater support of the tower - 2. At the Horns Rev 1 (HR1) facility, pinpoint corrosion is noted on TPs painted with the lean two-coat epoxy system - 3. Poorly ground ceramic extenders combined with a low DFT render a coating film permeable - 4. This image shows a decommissioned TP from Yttre Stengrund Wind Farm, Baltic Sea, Sweden, after more than 15 years of service. The splash zone area has been attacked by ice, other impacts and general wear. The area above the splash zone is in fairly good condition. The brackish, low-saline water and the cold climate of the Baltic Sea may have contributed to the lesser corrosion - 5. 5 (left): The two-coat epoxy system at 1,000-1,100 μm DFT on the last five of the HR1 TPs has shown good and lasting resistance, apart from damage caused by impact from supply boats, and the protection remains intact today. Fig. 6 (right): This photo shows the corrosion attacks in 2015 on TPs coated with the lean 350 μm permeable coating system - 7. This image shows an offshore transformer station. Two typical faults in the surface treatment process that initiate corrosion attacks are noted. The red circles show the lack of rounding of edges (chamfering) on part of the steel bar. The blue circle shows a poorly mounted and painted light accessory after installation of the station. The intact ventilation duct on the left side of the photo has been mounted correctly during the manufacture of the station - 8. - TABLES : 1. Paint system for jackets on TPs - 2. Revised paint system for jackets on TPs - 3. The flaking of the topcoat and the penultimate intermediate coat on this boat landing was caused by aluminum dust originating from an adjacent thermal spray application during construction and from exceeding recoating intervals - 9. The flaking of the topcoat and the penultimate intermediate coat on this boat landing was caused by aluminum dust originating from an adjacent thermal spray application during construction and from exceeding recoating intervals En ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=5972 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28379 [article]

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Green coatings from a global perspective / Don Futch in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 12 (12/2016)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 33, N° 12 (12/2016) . - p. 34-43 Titre : Green coatings from a global perspective Type de document : texte imprimé Auteurs : Don Futch, Auteur Année de publication : 2017 Article en page(s) : p. 34-43 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie écologique Normalisation Peinture -- Constituants -- Nomenclature Produits chimiques -- Nomenclature Revêtements (produits chimiques):Peinture (produits chimiques) Index. décimale : 667.9 Revêtements et enduits Résumé : This article will examine the different restrictions and indicators currently used to classify coatings as "green". It will also take a brief look at the organizations and governmental agencies involved in the classification of these coatings and discuss the processes involved. Finally, the author will propose guidelines for development of a universal standard based on existing commonality that would then have to be accepted by the global sanctioning bodies and users, while overcoming the bureaucratic hurdles and other obstacles and challenges in the way. Note de contenu : - CAN LOWER VOC CONTENT MAKE A COATING GREEN ? - OTHER GREEN INDICATORS - HAPs : Ozone depleting chemicals - Banned chemicals - Exempt solvents - Heavy metals - CREATING A GLOBAL STANDARD : Common ground - Minimize exceptions - Eliminate inconsistencies - Create one global standard - For greenness En ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=5973 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28380 [article]

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Journal of Protective Coatings and Linings Vol. 33, N° 12 URL