Can in process quality control prevent premature coating failure ? / William D. Corbett in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 30, N° 1 (01/2013)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 30, N° 1 (01/2013) . - p. 17-28 Titre : Can in process quality control prevent premature coating failure ? Type de document : texte imprimé Auteurs : William D. Corbett, Auteur ; Richard A. Burgess, Auteur Année de publication : 2013 Article en page(s) : p. 17-28 Langues : Américain (ame) Catégories : Qualité -- Contrôle Revêtements -- Corrosion:Peinture -- Corrosion Revêtements -- Défauts:Peinture -- Défauts Revêtements -- Fissuration Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : For decades we have heard that the incidence of premature coating failure would decline by explicitly requiring the contractor to control the quality of workmanship (via contract document language) using properly trained (and equipped) quality control personnel. In this case from the F-Files, we'll take a brief look at five case history failures and assess whether quality control inspection of the work as it proceeded could have prevented the failure from occuring, or whether it would have happened despite the effort of knowledgeable quality control personnel. Note de contenu : - Spontaneous cracking of the coating along the fillet weld - Poor adhesion of the coating of the top of the bottom flange - Corrosion of steel beneath alkyd primer evident within six months - Condition of the coating on the underside of the viaduc before brush-off blast cleaning - Area where epoxy mastic was applied directly to the steel rather than the aged alkyd Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17263 [article]

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Laboratory testing of candidate coating systems for protecting A 490 bolts in one world trade center construction / John Bullard in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 27, N° 3 (03/2010)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 27, N° 3 (03/2010) . - p. 34-45 Titre : Laboratory testing of candidate coating systems for protecting A 490 bolts in one world trade center construction Type de document : texte imprimé Auteurs : John Bullard, Auteur ; William D. Corbett, Auteur Année de publication : 2010 Article en page(s) : p. 34-45 Langues : Américain (ame) Tags : Construction  world  trade  center  New  York  Formulation  système  peinture  protection  boulons  écrous  rondelles  Procédés  application  Méthodologie  Résultats  Norme  ASTM  A  490  325 Index. décimale : 667.9 Revêtements et enduits Résumé : In this article, the authors report on the surface preparation and coating system selection for the bolt/washer/nut assemblies for the new construction of one world trade center in New York. The articles describes the methods of surface preparation and pretreatments used, the coating systems selected and applied, the testing methodology, and the test results. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8884 [article]

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Measuring dry film coating thickness according to SSPC-PA 2 / William D. Corbett in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 30, N° 4 (04/2013)

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 30, N° 4 (04/2013) . - p. 20-37 Titre : Measuring dry film coating thickness according to SSPC-PA 2 Type de document : texte imprimé Auteurs : William D. Corbett Année de publication : 2013 Article en page(s) : p. 20-37 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. Couches minces Epaisseur -- Mesure Revêtements -- Appareils et matériels:Peinture -- Appareils et matériels Revêtements -- Normes:Peinture -- Normes Revêtements:Peinture Index. décimale : 667.6 Peintures Résumé : Coating thickness shall be measured in accordance with SSPC: The Society for Protective Coatings Paint Application Standard No. 2 (SSPC-PA 2) is a simple enough statement, yet this common specification requirement is often misinter-preted or regarded as a document that simply states how to measure the dry film thickness (DFT) of coatings, something we already profess to know how to do. Yet the requirements of SSPC-PA 2 regarding gage calibration, verification of gage accuracy and adjustment procedures, the number of measurements to obtain, and the tolerance of the measurements are complex and should be fully understood by the specification writer before invoking PA 2 in a contract. On more than one occasion, I have heard the question, "When did SSPC-PA 2 and dry film thickness measurement become so complicated?" In fact, when you take a close look, measuring DFT isn't that complex. We have allowed it to become more technologically complex while making the data easier to analyze. We can gather hundreds of gage readings in a relatively short time; batch the measurements; print the data or upload it to a computer for graphing; report the highest, the lowest, the mean, and standard deviation of the collected data; incorporate digital images of the structure or coated area; and even program the gage to pro-duce an audible signal if a spot measurement is outside of the tolerance range. I am no doubt leaving out other bells and whistles, but my point is that while we are able to do a lot with the readings obtained, measuring DFT involves four or five basic steps. • Step 1: Instrument Calibration • Step 2: Verification of Gage Accuracy on Certified Coated Standards or Certified Shims • Step 3: Base Metal Reading Acquisition or Gage Adjustment (using certified or measured shims) • Step 4: Measurement of Coating Thickness • Step 5: Correction for Base Metal Reading (if acquired). After a brief review of the history of SSPC-PA 2, this article will describe each of the five steps, based on the 2012 edition of SSPC-PA 2. Special attention will be given in the article to how PA 2 addresses the required number of coating thickness measurements; the acceptability of gage readings, spot measurements, and area measurements; nonconforming thickness; measuring DFT on coated edges; and measuring DFT on pipe exteriors. Note de contenu : - SOME HISTORY - GAGE TYPES - GAGE CALIBRATION, ACCURACY VERIFICATION, AND ADJUSTMENT - VERIFYING ACCURACY : Verifying the accuracy of type 1 gages - Verifying the accuracy of type 2 gages - Adjusting type 2 gages - REQUIRED NUMBER OF COATING THICKNESS MEASUREMENTS - DETERMINING THE MAGNITUDE OF NONCONFORMING THICKNESS - APPENDICES TO THE STANDARD : Method for measuring the dry film thickness of coating on edges - Method for measuring dry film thickness on coated steel pipe exterior Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18795 [article]

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