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The case of the spotty disbondment in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 8 (08/2017)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 8 (08/2017) . - p. 14-19 Titre : The case of the spotty disbondment Type de document : texte imprimé Année de publication : 2017 Article en page(s) : p. 14-19 Langues : Américain (ame) Catégories : Analyse des défaillances (fiabilité) Décollement cathodique (revêtement) Epoxydes Expertises Haut extrait sec Métaux -- Revêtements protecteurs Réservoirs (récipients) Réservoirs (récipients) -- revêtements protecteurs Revêtements -- Défauts:Peinture -- Défauts Index. décimale : 667.9 Revêtements et enduits Résumé : The author examined a tank of the floating-roof some 100 feet in diameter and hidden a mile off a two-lane blacktop. It was a vivid white storage tank and showed bright in stark and gleaming contrast to the head-high, green corn and golden silk of the ears. The facility was spotless and cleaned and the tank was vented. The tank interior was pristine but for the various areas of peeling and otherwise distressed paint. The tank was designed to store wastewater mixed with petroleum byproducts. The exact contents were not revealed but it was a unique blend and no one knew quite how the material would interact with the coating system. It was reported that the epoxy coating system had been installed six years earlier and purported to be high-solids (greater than 98 percent) applied at approximately 20 mils. There were discrepancies as to whether a primer was used during the initial install and whether or not repairs had taken place during the application. One account indicated that during the initial application some large areas on the floor were too thin and the material was re-sprayed. Note de contenu : - Signs of trouble - The visual inspection - Getting up close and personal - Surface prep - Solving in the mystery - Do you know ? - The awner(s) - Problem number one, two and three - Recommendations Fig. 1. The epoxy is clearly peeling away from the substrate. All figures courtesy of the author unless otherwise noted Fig. 2. The scalloped area highlighted by the blue area shows evidence of good adhesion Fig. 3. In some areas of the tank floor, the chips of coating coming off were dirty on the bottom side Fig. 4. In some areas of the tank floor, the chips of coating coming off were clean on the bottom side Fig. 5. Stills from a video that show areas of disbondment and poor adhesion found sporadically throughout the tank Fig. 6. The football-shaped, damaged sections exhibiting a cohesive failure were only found in areas such as lap welds, the sump lip and slightly raised sections of the tank floor Fig. 7. Stills from a second video show the disbonded coating coming off where the back side of the coating appears to be contaminated with dirt, or more likely, with dust from blasting Fig. 8. The steel substrate in the failing areas examined had a peened, crater-like profile (left) and not an angular one as was required (right) En ligne : http://www.paintsquare.com/archive/index.cfm?fuseaction=view&articleid=6105 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29162 [article]

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Transmission tower and pole painting : a challenge for all involved / Matthew McCane in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 8 (08/2017)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 8 (08/2017) . - p. 26-34 Titre : Transmission tower and pole painting : a challenge for all involved Type de document : texte imprimé Auteurs : Matthew McCane, Auteur ; Curt Hickcox, Auteur Année de publication : 2017 Article en page(s) : p. 26-34 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Entretien et réparations Environnement -- Protection Epoxydes Logistique (organisation) Métaux -- Revêtements protecteurs Pylones électriques Revêtements (produits chimiques):Peinture (produits chimiques) Sécurité du travail Traîtements de surface Travailleurs -- Protection Index. décimale : 667.9 Revêtements et enduits Résumé : The North American electric transmission grid, considered by many to be one of the greatest engineering feats ever to be implemented, is in rough shape. The American Society of Civil Engineers (ASCE) assigns a grade of “D+” to the grid infrastructure and ranked its aging and condition the Number One challenge to reliability, both in likelihood of occurrence and potential severity. An unreliable electric grid will have significant negative impact both from an economic and security aspect. The direct cost to the grid from corrosion alone is some $700 million annually with indirect costs much higher. Note de contenu : - Contractor qualifications - Surface preparation - Application - Coating systems - Environmental considerations - Worker training - On-site training and documentation - QA/QC discussion and typical documentation - Specification - Documents that will assist the bidder - The end result Fig. 1. Mitt application of high-build (10-to-12 mils WFT/9-to-11 mils DFT) zinc-dust oil alkyd tower paint to an energized 500 kV weathered galvanized steel lattice electric transmission tower Fig. 2. The individual components of a transmission tower En ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6100 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29163 [article]

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Sustainable steel bridge maintenance in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 8 (08/2017)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 8 (08/2017) . - p. 38-48 Titre : Sustainable steel bridge maintenance : The role of paint in a life-cycle assessment Type de document : texte imprimé Année de publication : 2017 Article en page(s) : p. 38-48 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 Durée de vie (Ingénierie) Environnement -- Etudes d'impact Ponts -- entretien et réparations Ponts métalliques -- Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Coating manufacturers have long contended that the extended maintenance intervals made possible by the use of high-performance, highly durable coating systems, far outweigh their initial contribution to the eco-footprint of a structure when the benefit that accrues from the use of coatings is taken into account over the whole of its life. The authors discuss a study to test this contention, quantifying the effect of coating systems of varying durability (and hence varying maintenance requirements) on the environmental impact of a steel bridge over the course of its functional life. Note de contenu : - LEGISLATIVE BACKGROUND TO SUSTAINABILITY WITHIN THE E.U. : CEPE support for life-cycle assessment - Output data from the eco footprint tool - THE EFFECT OF PROTECTIVE COATINGS ON SUSTAINABILITY OF STEEL BRIDGES : Scope of the study : Project design parameters - Life-cycle assessment methodology - Life-cycle scenarios - LIFE-CYCLE ASSESSMENT RESULTS : Scenario 1 : Full life-cycle assessment - Scenario 2 : Bridge maintenance only - Scenario 3 : Coating processes only - TABLES : 1. Example Output from Eco Footprint Tool - 2. Stages for the Full LCA for a Coated Steel Bridge - 3. Coating System Compositions and Estimated Intervals - 4. Assumptions Included in the Calculations of Bridge Maintenance LCA Values - 5. The Main Influence Factors in Environmental Performance - FIGURES : 1. Input data utilized by the Eco-Footprint Tool - 2. GWP Results for the full life cycle over the bridge life of 100 years - 3. GWP Results for bridge maintenance over its 100-year life - 4. GWP results for bridge maintenance coatings assessed at each application over the 100-year life of the bridge - 5. LCA results showing the contribution of each coat to the total GWP of a bridge over its 100-year life cycle En ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6104 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29166 [article]

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The development of corrosion resistant 2- and 1-K waterbased zinc-rich paints / Kenichi Nakamura in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 8 (08/2017)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 34, N° 8 (08/2017) . - p. 50-56 Titre : The development of corrosion resistant 2- and 1-K waterbased zinc-rich paints Type de document : texte imprimé Auteurs : Kenichi Nakamura, Auteur ; Pascal Verbiest, Auteur Année de publication : 2017 Article en page(s) : p. 50-56 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 Essais de brouillard salin Métaux -- Revêtements protecteurs Poudres Revêtement monocomposant:Peinture monocomposant Revêtements bi-composant:Peinture bi-composant Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- Additifs solvants Zinc Index. décimale : 667.9 Revêtements et enduits Résumé : This article explains the formulation and performance of a waterbased (WB) zinc-rich paint, with 95-percent zinc content in the dry film, that is able to provide corrosion protection to steel equal to that of hot-dip galvanizing. Note de contenu : - ABOUT TWO-COMPONENT WATERBASED ZINC-RICH PAINT : How to choose resins - How to decrease flash rust - RESULTS AND CONSIDERATION - ABOUT ONE-COMPONENT WATERBASED ZINC-RICH PAINT - FIGURES : 1. Cross section of the zinc-rich paint film - The selected waterbased urethane dispersion provided the best results of all contenders in a stress test - 3. Aqueous anti-flash rust additives decreased flash rust. The left side of the image is before use ; the right side, after - 4. SEM image of zinc powders covered with additives (3,000 ppm) - 5. Additive results after 1,000 hours of salt-spray testing (SST). Amount of additives from left : 200 ppm, 1,000 ppm, 2,000 ppm and 3,000 ppmc-rich paints - 6. 2,016 hours of SST. Left, WB zinc-rich paint. Right, HDZ55 - 7. 2,016 hours of cyclic corrosion testing (CCT). Left, WB zinc-rich paint. Right, HDZ55 - 8. Zinc powders without any surface treatments react gradually with water and generate hydrogen gas - 9. The anti-corrosion performance of the 2K WB ZRP, 2 months after mixing at 20 hours of SST (left) and 260 hours of SST - 10. SEM image of zinc powders with the 0G treatment - 11. Cumulative generation of hydrogen gas - 12. 1,000 hours SST for the 1K WB ZRP, two months after mixing - 13. 1,000 hours CCT for the 1K WB ZRP, two months after mixing - TABLES : 1. Residual rate of hydrophilic groups in the film after outside exposure - 2. Conventional solvent type vs. waterbased En ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6099 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29167 [article]

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Journal of Protective Coatings & Linings Vol. 34, N° 8 URL