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Cutting creep / Pascal Verbiest in PROTECTIVE COATINGS EUROPE (PCE), Vol. 4, N° 1 (01-02-03/2012)

[article]  inPROTECTIVE COATINGS EUROPE (PCE) > Vol. 4, N° 1 (01-02-03/2012) . - p. 9-14 Titre : Cutting creep : Alloyed zinc powders to reduce the rust creep in high performance anti-corrosion coatings Type de document : texte imprimé Auteurs : Pascal Verbiest, Auteur ; Lars Thorslund Pedersen, Auteur Année de publication : 2012 Article en page(s) : p. 9-14 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosifs Anticorrosion Epoxydes Essais (technologie) Revêtements poudre:Peinture poudre Structures offshore -- Revêtements protecteurs Zinc Index. décimale : 667.9 Revêtements et enduits Résumé : Zinc rich primers, both organic and inorganic types, are extensively used in the marine and the offshore industry. The beneficial effect of zinc-rich primers is attributed to their cathodic protection mechanism. During the 60s and the 70s zinc rich epoxy primers dominated the market. Later, zinc ethyl silicate primers took over thris role but nowadays zinc epoxy primers have made a comback. Some of the advantages of zinc epoxies compared to zinc silicates are the less demanding curing conditions (epoxies will cure faster and they are not dependent on high humidity), their easiness to overcoat (the porosity of silicates may cause popping) and their less demanding substrates preparation (Sa 2 1/2 as compared to Sa 3 for zinc silicates) prior to application. This makes the zinc epoxy primers very attractive for maintenance for building applications where surface preparation requirements cannot be met, where applicators are less skilled and/or where climate control during application does onts favour zinc-silicates. The increasing demands for the performance zinc riche primers (low rust creep) have generated an even higher need to maximize the benefit of the zinc powder in the paint and to optimise the rust creep resistance. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13623 [article]

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Thermal metal spraying exposed / David H. Deacon in PROTECTIVE COATINGS EUROPE (PCE), Vol. 4, N° 1 (01-02-03/2012)

[article]  inPROTECTIVE COATINGS EUROPE (PCE) > Vol. 4, N° 1 (01-02-03/2012) . - p. 16-22 Titre : Thermal metal spraying exposed : Why are we 'throwing the baby out with the bathwater' Type de document : texte imprimé Auteurs : David H. Deacon, Auteur Année de publication : 2012 Article en page(s) : p. 16-22 Langues : Anglais (eng) Catégories : Anticorrosion Corrosion Essais (technologie) Essais de brouillard salin Métaux -- Revêtements protecteurs Pulvérisation thermique Revêtement métallique Index. décimale : 667.9 Revêtements et enduits Résumé : Thermal metal spraying (TMS) has been around and used extensively for protection of a range of steel structures and components, both large and small for very many years (over 65 in my own experience). My first personal experiences of TMS, both sealed and over painted with various paint systems, goes back to the 1960s when I became the first qualified Paint Technologist to join the British Iron and Steel Research Association (BISRA) and joined a team in the corrosion section of metallurgists, corrosion engineers and chemists. One of my projects was to research the performance of TMS for my then Manager - john Stanners who together with his colleague Ken Chandler (who ran the Corrosion Advice Bureau at BISRA) were to give a paper to the European Corrosion Conference in the Hague. This project involved examining the test panels at all of the BISRA exposure sites in marine, industrial and rural exposure atmospheres and to report on the performance of the various systems under test, some of which had been exposed for over 10 years at that time. As part of the exercise to establish the practical performance of TMS coatings, I also visited the workshop of the Great Ouse River Board (GORB) at Kings Lynn together with John Stanners. I then learnt that the GORB had setup its own TMS spray shop for the sluice and floodgate corrosion protection in the GORB area, as long as 1948. The work shop manager showed us four sluice gates around the Kings Lynn area and, although these had been immersed in fenland water and one with a marine salt water environment, the structures had lasted for between 15 and 18 years. Note de contenu : - Incredibly impressed - Success and failure - Established performance - Testing coating - Recent application Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13624 [article]

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It's film time / Hans Hilleweart in PROTECTIVE COATINGS EUROPE (PCE), Vol. 4, N° 1 (01-02-03/2012)

[article]  inPROTECTIVE COATINGS EUROPE (PCE) > Vol. 4, N° 1 (01-02-03/2012) . - p. 25-26 Titre : It's film time : Improving the efficiency of wind turbines using riblet film Type de document : texte imprimé Auteurs : Hans Hilleweart, Auteur Année de publication : 2012 Article en page(s) : p. 25-26 Langues : Anglais (eng) Catégories : Couches minces Eoliennes Frottements (mécanique) Index. décimale : 667.9 Revêtements et enduits Résumé : Back in the August issue of PCE we looked at how 3M is working with the University of Minnesota Saint Anthony Falls Laboratory (SAFL) on a research project to studying drag reduction in wind turbine blades using riblet film. The aim of the project is to build new fundamental fluid mechanics research knowledge and understand how 3M's experimental riblet films can help maximise energy capture, which may prove to be increasingly valuable to the wind turbine manufacturers who are developing larger turbines, such as the ones used offshore. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13625 [article]

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Performance of paint systems after UHP (part 3) / Philippe Le Calvé in PROTECTIVE COATINGS EUROPE (PCE), Vol. 4, N° 1 (01-02-03/2012)

[article]  inPROTECTIVE COATINGS EUROPE (PCE) > Vol. 4, N° 1 (01-02-03/2012) . - p. 38-47 Titre : Performance of paint systems after UHP (part 3) Type de document : texte imprimé Auteurs : Philippe Le Calvé, Auteur ; Jean-Pierre Pautasso, Auteur Année de publication : 2012 Article en page(s) : p. 38-47 Note générale : Bibliogr. Langues : Anglais (eng) 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. Anticorrosion Atmosphère marine Corrosion Essais (technologie) Métaux -- Nettoyage Traîtements de surface Tags : 'Surface  métallique'  Acier  'Nettoyage  eau  ultra-haute  pression'  'Préparation  surface  avant  peinture' Index. décimale : 667.9 Revêtements et enduits Résumé : Surface preparation processes influence the performance and lifetime of coating systems applied to steel substrates. The state of the steel surface immediately prior to painting is crucial and the main factors influencing the performance are the presence of rust and mill scale, surface contaminants including dust, salts and grease, surface profile. For aggressive environments such as marine atmospheres of C5M corrosivity category and high-performance coatings that require cleaner and/or rougher surfaces, blast cleaning is often the preferred method of surface preparation. However, it is well known that abrasive cleaning can produce a considerable amount of waste mainly containing blasting media, old removed paint and rust products. As an alternative to abrasive cleaning for maintenance work or complete renovation, ultra high pressure (UHP) waterjetting is becoming common as long as the performances of the coatings on steel structures are not affected. UHP waterjetting technology has been described intensively in previous papers. There are however questions about its suitability for new (naval) constructions. Due to this, a project was started with the purpose of reinforcing the knowledge on the behaviour of different paint systems for highly corrosive marine environments (C5M) and more particularly assessing UHP waterjetting performance in relation to abrasive blasting on steel coated with a zinc-rich shop primer (ZRP). In the first stage of the study, the characterisation of surfaces after UHP waterjetting of shop primet steel surfaces was reported in the april/june 2011 issue of PCE, and in the second part (reported in july/sep 2011 issue of PCE), the performance of 7 paint systems applied on UHP (DHP 4) treated ZRP coated steel flat panels and welded panels was studied in laboratory and field tests. The results were compared with conventional abrasive blasted (Sa 2.5 MG) surfaces. It was concluded that UHP waterjetting was a promising technique for steel surface preparation within the scope of new constructions (on ZRP coated steel). The results showed a comparable behaviour of UHP waterjetting with standard surfaces after abrasive blasting. Despite a slight difference in the roughness compared to abrasive blasting, coating performance did not seem to be affected. However, some results remained inconclusive regarding welded panels as a consequence of inhomogeneous weld area. In this article, the authors describe the third and final part of the study which involved testing three paint systems over UHP waterjetted ZRP panels, including more representative welded panels, compared to conventional grit blast treated panels. Note de contenu : - Experimental conditions - Test panels, surface preparation and coating - Artificial ageing test and field test - Assessments : visual assessment - Pull-off adhesion test - Assessment requirements - Results : Cyclic corrosion test C5M - Natural ageing Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13626 [article]

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