Anti-corrosive coating for metal surfaces

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 30/00 (2006.01) B32B 15/00 (2006.01) C23F 13/16 (2006.01)

Patent

CA 2702638

A protective coating for a metal substrate is provided that is light, durable, galvanically protective, and easily applied at the site of manufacture. The coating has at least two layers, one of which is a galvanizing layer and one of which is a micro-composite of a galvanic metal and a non-conducting material, such as polymer. Such coatings are useful for example to protect pipes or other metal surfaces in corrosive environments. Methods of producing the coating are provided, including methods that use advanced spraying techniques to provide very thin but consistent layers. Using the advanced spraying methods the composite layer can be created by co-spraying the galvanic metal and the nonconductive material onto the surface of the galvanic coating. Optionally, an outer coat of insulating material can be applied to provide further protection to the surface.

L'invention concerne un revêtement de protection d'un substrat métallique, lequel revêtement est léger, durable, assure une protection galvanique et est appliqué aisément sur le site de fabrication. Le revêtement présente au moins deux couches dont l'une est une couche de galvanisation et l'autre est un microcomposite d'un métal galvanique et d'un matériau non conducteur, par exemple un polymère. Ces revêtements peuvent être utilisés par exemple pour protéger des tuyaux ou d'autres surfaces métalliques dans des environnements corrosifs. L'invention propose des procédés de production du revêtement, notamment des procédés qui utilisent des techniques avancées de pulvérisation pour réaliser des couches très minces mais cohérentes. En recourant aux méthodes avancées de pulvérisation, la couche composite peut être formée par co-pulvérisation du métal galvanique et du matériau non conducteur sur la surface du revêtement galvanique. Facultativement, on peut appliquer un revêtement extérieur de matériau isolant pour encore protéger davantage la surface.

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