[article]
| 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 |
in PROTECTIVE COATINGS EUROPE (PCE) > Vol. 4, N° 1 (01-02-03/2012) . - p. 38-47
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