Method for applying an anti-corrosion coating on parts of a...

B - Operations – Transporting – 05 – D

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B05D 7/14 (2006.01)

Patent

CA 2670219

The invention relates to a method for applying a single-layer or multi-layer anti-corrosion coating on a metallic substrate being part of a pipe or a duct accessory to be buried or submerged for conveying a fluid such as water, petroleum products, gas or sanitising products. According to the invention, the method comprises: a) preparing the surface of the substrate by mechanical means only; b) applying an adhesion promoter on the prepared surface comprising a an aqueous solution of at least one silane without any further chemical process; c) applying a layer of an epoxy-resin powdery paint on the surface coated with the adhesion promoter; and d) applying at least one thermal process to the surface at least of the substrate, wherein at least one step d) for thermal processing is carried out between steps a) and b) or between steps b) and c).

L'invention concerne un procédé d'application d'un revêtement anticorrosion, monocouche ou multicouche, sur un substrat métallique entrant dans la constitution d' un tube ou d'un accessoire d'une canalisation destinée à être enterrée ou immergée pour le transport de fluide, tel que l'eau, les produits pétroliers, le gaz, ou les produits d'assainissement. Selon l'invention, le procédé comprend : a) une préparation de la surface du substrat, uniquement mécanique; b) une application d'un promoteur d'adhérence sur la surface préparée constitué par une solution aqueuse d' au moins un silane, sans traitement chimique complémentaire; c) une application d'une couche de peinture poudre à base de résine époxy sur la surface revêtue du promoteur d' adhérence; et d) au moins un traitement thermique d' au moins la surface du substrat; au moins une étape d) de traitement thermique étant effectuée entre les étapes a) et b) ou entre les étapes b) et c).

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