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JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) . Vol. 33, N° 11Russian roulette : Coating performance and sulfide removal treatmentMention de date : 11/2016 Paru le : 18/12/2016 |
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Ajouter le résultat dans votre panierHow to prepare galvanizing for painting / E. Bud Senkowski in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 11 (11/2016)
[article]
Titre : How to prepare galvanizing for painting Type de document : texte imprimé Auteurs : E. Bud Senkowski, Auteur Année de publication : 2016 Article en page(s) : p. 14-21 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
Galvanisation
Métaux -- Revêtements protecteurs
ZincIndex. décimale : 667.9 Revêtements et enduits Résumé : Galvanizing presents many challenges to painting operations. While the zinc coating can add substantial life to steel surfaces, its surface chemistry and electrochemical activity can result in conditions leading to adhesion failures of applied organic coatings. The key to successful painting lies in recognizing the many surface conditions presented by new and weathered galvanizing and then employing effective cleaning operations to mitigate their effect. Success is ultimately achieved by selecting coating products that will develop a strong and enduring bond to the galvanized surface. Note de contenu : - WHAT IS GALVANIZING ?
- TYPES OF GALVANIZING
- HOW LONG WILL ZINC PROTECT STEEL ?
- HOW DOES ZINC DETERIORATE ?
- WHY DO WE PAINT GALVANIZING ? : To replace lost corrosion protection - To extend galvanizing life with a duplex system - To improve appearance
- PROBLEMS WITH PAINTING GALVANIZING
- SURFACE CONTAMINANTS : Oil and grease - Zinc oxide - Wet storage stain - Chromate conversion coatings - Rust
- NEWLY GALVANIZED STEEL
- PARTIALLY WEATHERED GALVANIZED STEEL : Phosphate conversion coatings - Basic zinc chromate-vinyl butyral wash primer - Acidic acrylic pretreatment
- FULLY WEATHERED GALVANIZED STEEL
- COATING CHOICES FOR GALVANIZING : Avoiding saponification
- VALUABLE REFERENCES
- FIGURES : 1. Hot-dip galvanizing bath - 2. Coating delamination at a galvanized surface - 3. Coating delamination from galvanized roof panelsEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=5950 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28381
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Code-barres Cote Support Localisation Section Disponibilité 18510 - Périodique Bibliothèque principale Documentaires Disponible Failure of a bridge deck topcoat / Warren Brand in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 11 (11/2016)
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Titre : Failure of a bridge deck topcoat Type de document : texte imprimé Auteurs : Warren Brand, Auteur Année de publication : 2016 Article en page(s) : p. 22-25 Langues : Américain (ame) Catégories : Epoxydes
Expertises
Matériaux cimentaires -- Revêtements protecteurs
Ponts -- Revêtements protecteurs
Revêtements -- Analyse
Revêtements -- Finition
Revêtements protecteurs -- DétériorationIndex. décimale : 667.9 Revêtements et enduits Résumé : It’s never a good day when large chunks of a newly installed three-layer epoxy coating system begin to come off of any concrete floor — and even more troubling when they come off of a bridge deck.
Concrete is absorbent. It will hold chlorides, moisture, oils, greases, chemicals, gases and anything else that comes into contact with it. Cracks on a roadway, and more specifically on a concrete bridge, can provide a pathway to the rebar for contaminants, and particularly for chlorides from road salt. Rebar is wrapped in a figurative alkaline blanket approaching a pH of 11 when sitting in concrete. The alkalinity creates a thin patina on the rebar which, if maintained at that pH, will prevent corrosion for decades. However, if chlorides do enter the concrete and lower the pH, the corrosion rate of the rebar can skyrocket and therefore, preventing this phenomenon is critical.
Cracks and concrete go hand-in-hand. Concrete tends to crack for a variety of reasons and while almost always inevitable, instances of cracking can be reduced with proper design and engineering and if cracks do occur, they can be properly managed with appropriate coatings and other remedial solutions.Note de contenu : - THE BACKGROUND : The flood coat - The overlay
- FAILURE ANALYSIS : Visual inspection - Laboratory analysis
- FIGURES : 1. An overall view of a lapped section of Core Sample No. 4 - 2. A close-up of a lapped section of Core Sample No. 4 showing the epoxy overlay/concrete substrate interface - 3. A close-up view of the separation between the epoxy overlay and the concrete substrate - 4. Close-up view of separation (filled with blue epoxy) between the epoxy overlay and the concrete substrate under cross-polarized lightEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=5951 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28382
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Code-barres Cote Support Localisation Section Disponibilité 18510 - Périodique Bibliothèque principale Documentaires Disponible Single-component polysiloxane topcoat for navy surface ships / Erick B. Iezzi in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 11 (11/2016)
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Titre : Single-component polysiloxane topcoat for navy surface ships Type de document : texte imprimé Auteurs : Erick B. Iezzi, Auteur ; James Tagert, Auteur Année de publication : 2016 Article en page(s) : p. 26-31 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bateaux -- Revêtements:Bateaux -- Peinture
Résistance aux conditions climatiques
Résistance chimique
Réticulation à l'humidité
Revêtement monocomposant:Peinture monocomposant
Revêtements -- Finition:Peinture -- Finition
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
Souplesse (mécanique)Index. décimale : 667.9 Revêtements et enduits Résumé : This article details a recently developed, novel moisture-curable, haze gray single-component (1K) polysiloxane topcoat for U.S. Navy surface ships. The topcoat is low in VOCs, HAPs-free and provides excellent hydrocarbon resistance, flexibility and weatherability. Note de contenu : - Single-component polysiloxane topcoat
- Experimental procedure
- FIGURES : 1. "Pinking" of an LSA haze gray silicone alkyd on the topside of a Navy surface ship - 2. Sailors roll-apply fresh silicone alkyd - 3. A comparison of flexibility between NRL’s 1K polysiloxane, a qualified silicone alkyd and various 2K polysiloxane topside coatings after being bent over a ¼-inch cylindrical mandrel - 4. Color change after atmospheric exposure of low-solar-absorbing haze gray topcoats - 5. “Pinking” of an LSA haze gray silicone alkyd on the topside of a Navy surface shipEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=5944 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28383
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Code-barres Cote Support Localisation Section Disponibilité 18510 - Périodique Bibliothèque principale Documentaires Disponible Composites coatings : Basics of fiber-reinforced polymers for pipe repairs / David A. Hunter in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 11 (11/2016)
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Titre : Composites coatings : Basics of fiber-reinforced polymers for pipe repairs Type de document : texte imprimé Auteurs : David A. Hunter, Auteur Année de publication : 2016 Article en page(s) : p. 32-37 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bandes composites
Composites à fibres de carbone
Constructions immergées
Epoxydes
Tuyauterie -- ProtectionIndex. décimale : 667.9 Revêtements et enduits Résumé : The author describes the background and basics of composite fiber-reinforced polymer materials and considerations involved to assure a successful outcome using materials with mechanical capabilities greater than those of the original materials. Note de contenu : - Manufacturing considerations
- Fiber-reinforced polymer (nonmetallic composite) repairs
- Fiber-reinforced polymer repair installation
- Buyer beware
- FIGURES : 1. View of a pipe section over pressure testing - 2. Installation of a composite coating system - 3. View of the application of an epoxy/carbon fiber system repair of a T-section - 4. Underwater application of composites. Note the prepackaged, pre-impregnated resin system - 5. View of underwater application of compositesEn ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=5945 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28384
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Code-barres Cote Support Localisation Section Disponibilité 18510 - Périodique Bibliothèque principale Documentaires Disponible Russian roulette : Coating performance with or without a sulfide removal treatment / Yasir Idlibi in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 11 (11/2016)
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Titre : Russian roulette : Coating performance with or without a sulfide removal treatment Type de document : texte imprimé Auteurs : Yasir Idlibi, Auteur ; Jason Hartt, Auteur ; Mike O'Donoghue, Auteur ; Vijay Datta, Auteur ; Bill Johnson, Auteur Année de publication : 2016 Article en page(s) : p. 38-50 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier au carbone
Chimie -- Essais et réactifs
Epoxydes
Métaux -- Revêtements protecteurs
Polyamine cyclique
Revêtements -- Analyse:Peinture -- Analyse
Sulfures
Surfaces -- NettoyageIndex. décimale : 667.9 Revêtements et enduits Résumé : Worldwide, many thin- and thick-film innovative polycyclamine-cured epoxy linings have performed admirably in oil patch, high-temperature service for tank, vessel and pipe spool internals. Notwithstanding, with ever-increasing temperatures and pressure and chemical resistance requirements in oil and gas environments, the demands placed upon linings are becoming more stringent.
This article investigates whether the performance of these linings could be enhanced by first abrasive blasting the steel substrate and then providing a subsequent application (and removal) of a unique chemical reagent to remove deleterious sulfide contaminants, improve lining performance in aggressive immersion service conditions and potentially extend the life-cycles of the applied linings.
Accelerated laboratory investigations were carried out on a set of reagent-treated, and untreated, carbon steel test panels. Sets of panels were lined with a three-coat, thin-film solvent-borne epoxy novolac coating or a single coat solvent-free, thick-film polycyclamine-cured epoxy.
Characterization of the lining performance, the lining-steel interface and efficacy of the sulfide removal reagent was achieved using autoclave (NACE-TM0185), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM/EDX) and X-Ray diffraction (XRD).Note de contenu : - CANDIDATE SURFACE DECONTAMINATION TECHNOLOGY CHEMICAL CLEANING
- CANDIDATE EPOXY LININGS
- EXPERIMENTATION : Preparation and treatment of steel panels - Lining application
- TEST METHODS FOR COATING EVALUATION : Autoclave - Electrochemical impedance spectroscopy (EIS) - Adhesion and visual rating - Surface profile measurements - Conductivity measurements - SEM-EDX - X-ray diffraction
- RESULTS AND DISCUSSION : Surface profile measurement and visual observations - Conductivity measurement - SEM-EDX
- FIGURES : 1. Preparation and treatment of 42 panels prior to coating application - 2. Examples of deliberately contaminated panels - 3. Examples of pre-test panels. (Left to right): Coating 2-Panel A, Coating 1-Panel B, Coating 2-Panel B and Coating 1-Panel C - 4. Coating 1 panels, post autoclave test. (Left to right): 2A, 1B, 2B and 1C - 5. Coating 2 panels, post autoclave test. (Left to right): 2A, 1B, 2B and 1C - 6. Impedance, pre- and post-autoclave exposure - 7. (Left) Panel A, Panel B (washed, brush blasted one side; contaminated on other side) and Panel C. (Center) Panel A, SSPC-SP 5/NACE No. 1 and (Right) Panel C, SSPC-SP 5/NACE No. 1 and chemically cleaned - 8. (Top row, Left) Test panels as received, (Center) unpacking of Test Panel B washed, uniform rusting throughout; Test Panel B unwashed similar and (Right) Test Panel B, boiling extraction method, all others similar. (Bottom row, Left): Test Panel A, surface profile measurements (ASTM D4417) prior to boil extraction, (Center) Test Panel C, surface profile measurements (ASTM D4417) prior to boil extraction and (Right) Liquid reagent sample cooling and test panels repackaged after boil extraction - 9. SEM image of Panel A (2,000 times as taken) showing surface and bulk energy-dispersive X-ray analysis (EDXA) elemental analysis showing iron, oxygen and other elements - 10. SEM image of Panel B clean surface (2,000 times as taken) showing surface and bulk EDXA elemental analysis showing iron oxide and other elements - 11. SEM image of Panel B dark surface (2,000 times as taken) showing surface and bulk EDXA elemental analysis showing iron sulfide and iron carbonate (as per XRD analysis) - 12. SEM image of Panel C (2,000 times as taken) showing etched surface from exposure to corrosive environment subsequently treated with cleaner. Surface is clean as shown by the predominantly iron peak shown in the EDX analysis - 13. (Left) At 8,000 times magnification, the surface of Panel A as blasted and (Right) Panel C after chemical treatment. Panel C shows etching effect from exposure to corrosive environment. By removing all the contaminants the chemical cleaner system has revealed the surface topography
- TABLES : 1-2. Coating 1 and 2 autoclave analysis - 3. Conductivity and surface profile measurements of test panels pre-coating application - 4. Summary of XRD resuls (wt%)En ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=5946 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28385
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